CN120166336A

CN120166336A - An acoustic output device

Info

Publication number: CN120166336A
Application number: CN202311743604.0A
Authority: CN
Inventors: 梁家宁; 李朝武; 张磊; 齐心
Original assignee: Shenzhen Voxtech Co Ltd
Current assignee: Shenzhen Voxtech Co Ltd
Priority date: 2023-12-15
Filing date: 2023-12-15
Publication date: 2025-06-17

Abstract

The embodiment of the specification provides an acoustic output device, which comprises a low-frequency acoustic unit, a high-frequency acoustic unit, a shell and a supporting structure, wherein the shell is configured to bear at least the low-frequency acoustic unit and the high-frequency acoustic unit, the supporting structure is configured to enable the shell to be worn near an ear canal but not to block the mouth of the ear canal, at least two sound guide holes are arranged on the shell, a first sound guide hole and a second sound guide hole of the at least two sound guide holes are respectively and acoustically coupled with two sides of a vibrating membrane of the low-frequency acoustic unit, one sound guide hole of the at least two sound guide holes is acoustically coupled with one side of the vibrating membrane of the high-frequency acoustic unit, and in a wearing state, the sound guide hole corresponding to the high-frequency acoustic unit faces towards the ear canal of a user. Through setting up high-frequency acoustic unit and making its sound guide hole towards user's ear canal, improve user's ear canal's high frequency volume, compensate the output of acoustic output device in the middle-high frequency channel not enough problem for acoustic output device has better acoustic output effect in the full frequency channel.

Description

Acoustic output device

Technical Field

The present disclosure relates to the field of acoustics, and in particular, to an acoustic output device.

Background

With the development of acoustic output technology, acoustic devices (e.g., headphones) have been widely used in daily life, and can be used with electronic devices such as mobile phones and computers, so as to provide users with hearing feast. The acoustic devices can be generally classified into head-wearing, ear-hanging, in-ear, and the like, according to the manner in which the user wears them. Traditional in-ear or headphone covers or blocks the auditory canal of the user, influences the experience of the user in some scenes, such as running, riding, swimming and other scenes, the user can not hear external sounds easily, and discomfort can be brought to the user when wearing the belt for a long time. The current open earphone has a larger attenuation amplitude in the middle-high frequency band (for example, the frequency band after 8 kHz), which results in a smolder sound in the middle-high frequency band and a poorer output effect.

Therefore, it is necessary to provide an acoustic output device having a better output performance.

Disclosure of Invention

One of the embodiments of the specification provides an acoustic output device, which comprises a low-frequency acoustic unit, a high-frequency acoustic unit, a shell, a supporting structure and at least one high-frequency acoustic unit, wherein the shell is used for bearing at least the low-frequency acoustic unit and the high-frequency acoustic unit, the supporting structure is used for enabling the shell to be worn near an auditory meatus but not blocking an auditory meatus opening, at least two acoustic holes are formed in the shell, a first acoustic hole and a second acoustic hole of the at least two acoustic holes are respectively and acoustically coupled with two sides of a vibrating diaphragm of the low-frequency acoustic unit, the low-frequency acoustic unit radiates sound to the outside of the shell through the first acoustic hole and the second acoustic hole, one acoustic hole of the at least two acoustic holes is acoustically coupled with one side of a vibrating diaphragm of the high-frequency acoustic unit, the high-frequency acoustic unit radiates sound to the outside of the shell through the one acoustic hole, and in a wearing state, the acoustic hole corresponding to the high-frequency acoustic unit faces towards an auditory meatus of a user. Through setting up high-frequency acoustic unit and making its sound guide hole towards user's ear canal, can improve user's ear canal's high frequency (for example be greater than 8 kHz) sound volume, make up the output of acoustic output device in middle-high frequency channel (for example be greater than 8 kHz's frequency channel not enough for acoustic output device has better acoustic output effect in full frequency channel.

In some embodiments, the one sound guiding hole is a third sound guiding hole, the low-frequency acoustic unit radiates sound to the outside of the shell through the first sound guiding hole and the second sound guiding hole, the high-frequency acoustic unit radiates sound to the outside of the shell through the third sound guiding hole, and the first sound guiding hole, the second sound guiding hole and the third sound guiding hole are respectively arranged at different positions of the shell, so that design difficulty of the third sound guiding hole towards the ear canal opening of a user is reduced, and the setting position of the high-frequency acoustic unit is more flexible.

In some embodiments, the third sound guiding hole is closer to the user's ear canal relative to the first sound guiding hole and the second sound guiding hole, so that the high-frequency sound received by the user's ear canal opening is more, and the sound pressure level received by the user's ear canal opening is ensured to be sufficiently high, so that the high-frequency listening effect is ensured. The shell comprises an inner side surface which is opposite to the front outer side surface of the ear of the user when the shell is worn, and the first sound guide hole and the third sound guide hole are both positioned on the inner side surface, so that the first sound guide hole and the third sound guide hole can be close to the ear canal of the user, and the hearing volume of the ear canal of the user is improved.

In some embodiments, the housing includes an inner side opposite to an anterolateral side of the user's ear when worn, the one sound guiding aperture is the first sound guiding aperture, the first sound guiding aperture is acoustically coupled to a diaphragm side of the low frequency acoustic unit and a diaphragm side of the high frequency acoustic unit, the first sound guiding aperture is located at the inner side, and the low frequency acoustic unit and the high frequency acoustic unit radiate sound to the user's ear canal through the first sound guiding aperture. Through the arrangement, the structure is simplified, and the processing design difficulty is reduced. Meanwhile, the first sound guide hole of the low-frequency acoustic unit and the sound guide hole corresponding to the high-frequency acoustic unit are required to be in the same plane, namely the high-frequency acoustic unit can be embedded in the inner side corresponding shell. Because the high-frequency acoustic unit is embedded in the shell, the high-frequency acoustic unit does not protrude out of the surface of the shell, so that the surface of the shell is smooth, and the shape is attractive.

In some embodiments, the overlapping ratio of the projection area of the high-frequency acoustic unit on the inner side surface of the shell and the projection area of the first sound guiding hole of the low-frequency acoustic unit on the inner side surface is not more than 10%, so that the high-frequency acoustic unit is prevented from shielding the first sound guiding hole, and the low-frequency hearing volume of a user is ensured.

In some embodiments, the centroid of the projection of the high-frequency acoustic unit on the inner side of the housing is closer to the junction of the support structure and the housing than the centroid of the projection of the low-frequency acoustic unit on the first sound guide hole of the inner side, so that the sound guide hole (e.g., the third sound guide hole) corresponding to the high-frequency acoustic unit is closer to the ear canal of the user than the first sound guide hole of the low-frequency acoustic unit, thereby ensuring the listening effect of high frequency.

In some embodiments, an end of the housing remote from the junction protrudes into the concha cavity of the user in the worn state, the housing including a short axis direction and a long axis direction, a centroid of the high frequency acoustic unit projected on the inner side surface being closer to an upper side surface of the housing than a centroid of the low frequency acoustic unit projected on the first sound guide hole of the inner side surface in the short axis direction of the housing. Therefore, in the wearing state, the high-frequency acoustic unit is prevented from shielding the first sound guide hole, so that the sound output by the low-frequency acoustic unit through the first sound guide hole is reduced, and the low-frequency listening volume of the auditory canal of the user is further influenced.

In some embodiments, the high frequency acoustic unit is located on the underside of the housing or at the junction of the underside and the inside of the housing, the housing at least partially covering the antitragus region of the user in the worn state. Since the acoustic output device is in the above-mentioned wearing state, the inner side and the lower side of the housing are closer to the user's ear canal. Through the arrangement, the sound guide holes (such as the third sound guide holes) of the high-frequency acoustic unit can better point to the user auditory meatus, the high-frequency auditory volume of the user auditory meatus is improved, the problem that the output of the acoustic output device in a medium-high frequency band (such as a frequency band larger than 8 kHz) is insufficient is solved, and the acoustic output device has a good acoustic output effect in a full frequency band.

In some embodiments, the included angle between the vibration direction of the high-frequency acoustic unit and the vibration direction of the low-frequency acoustic unit is within the range of 36 ° -54 °, so that the vibration direction of the low-frequency acoustic unit is perpendicular or approximately perpendicular to the inner side or the outer side while the vibration direction of the high-frequency acoustic unit faces the ear canal of the user, so that the vibrating diaphragm of the low-frequency acoustic unit has a larger size and a larger vibration space, the acoustic output device has a better sound leakage reducing effect, and the acoustic output device has a better acoustic output effect in the full frequency band.

In some embodiments, the housing includes a projected area and a non-projected area on an inner side of the housing, the projected area protruding from the non-projected area in a thickness direction of the housing. Through the arrangement, the acoustic output device can be adapted to more users, so that the high-frequency acoustic unit can easily approach the auditory canal of the user, and the auditory volume of the user is improved.

In some embodiments, the height difference between the projected area and the non-projected area is not less than 0.6mm in the thickness direction of the housing, or the ratio of the height difference between the projected area and the non-projected area to the thickness of the housing is greater than 0.05. Through the arrangement, the degree of the high-frequency acoustic unit protruding out of the shell can be designed, so that the acoustic output device has a good acoustic output effect at high frequency, and meanwhile, the listening volume of a user is ensured.

In some embodiments, the inner side of the housing includes a projected area and a non-projected area of the high frequency acoustic unit, the projected area and the non-projected area being flush to reduce loss of high frequency sound waves while improving acoustic output performance of the acoustic output device at high frequencies.

In some embodiments, the inner side surface of the shell comprises a projection area and a non-projection area of the high-frequency acoustic unit, and the ratio of the height difference between the projection area and the non-projection area in the thickness direction of the shell to the thickness of the shell is smaller than 0.3, so that the projection area and the non-projection area are flush or approximately flush, the acoustic output performance of the acoustic output device at high frequency is improved, and the listening volume of a user is improved.

In some embodiments, the minimum resonant frequency for the high frequency acoustic unit is no less than 5kHz and the minimum resonant frequency for the low frequency unit is no greater than 1kHz. Through the arrangement, the low-frequency acoustic unit can have larger output in the frequency range of middle and low frequencies (for example, 1kHz-8 kHz), and the high-frequency acoustic unit can have larger output in the frequency range of high frequencies (for example, more than 8 kHz), so that the acoustic output device has better acoustic output effect in the full frequency range (for example, more than 1 kHz).

One of the embodiments of the specification also provides an acoustic output device, which comprises a low-frequency acoustic unit, a high-frequency acoustic unit, a shell, a supporting structure and at least two sound guide holes, wherein the shell is used for bearing at least the low-frequency acoustic unit and the high-frequency acoustic unit, the supporting structure is used for enabling the shell to be worn near an auditory meatus but not blocking an auditory meatus, at least two sound guide holes are formed in the shell, the low-frequency acoustic unit and the high-frequency acoustic unit radiate sound to the outside of the shell through one or more of the at least two sound guide holes, the shell comprises an inner side face opposite to the front outer side face of an ear of a user when being worn, one of the at least two sound guide holes is located on the inner side face and is in acoustic communication with the low-frequency acoustic unit, the corresponding sound guide hole of the high-frequency acoustic unit faces the auditory meatus of a user when being worn, and the proportion of the projection area of the high-frequency acoustic unit on the inner side face of the shell to the projection area of the sound guide hole on the inner side face of the low-frequency acoustic unit is not more than 10%. Through the arrangement, the high-frequency acoustic unit can be prevented from shielding the sound guide hole on the inner side surface of the low-frequency acoustic unit when the sound guide hole of the high-frequency acoustic unit faces the auditory canal of the user, and the low-frequency hearing volume of the user is ensured, so that the acoustic output device has a good acoustic output effect in the full frequency range.

Drawings

The present specification will be further elucidated by way of example embodiments, which will be described in detail by means of the accompanying drawings. The embodiments are not limiting, in which like numerals represent like structures, wherein:

FIG. 1 is a schematic illustration of an exemplary pinna shown according to some embodiments of the application;

FIG. 2 is an exemplary frame diagram of an acoustic output device according to some embodiments of the present description;

FIG. 3 is an exemplary wearing schematic of an acoustic output device shown in accordance with some embodiments of the present description;

FIG. 4 is an interior schematic view of a housing shown according to some embodiments of the present description;

FIG. 5A is a schematic diagram of a frequency response curve of an acoustic output device according to some embodiments of the present disclosure under different conditions;

FIG. 5B is an enlarged schematic view of the high frequency curve of FIG. 5A;

FIG. 6 is a schematic illustration of the exterior profile of a housing shown according to some embodiments of the present disclosure;

FIGS. 7A-7C are schematic diagrams illustrating the locations of a first sound guiding hole and a third sound guiding hole according to some embodiments of the present disclosure;

FIG. 8 is a schematic illustration of the housing of the acoustic output device extending into the concha chamber, according to some embodiments of the present disclosure;

FIG. 9 is a schematic diagram of an acoustic model formed from the acoustic output device shown in some embodiments of the present description;

FIG. 10 is a schematic diagram of frequency response of an acoustic output device corresponding to different placement locations of a high frequency acoustic unit according to some embodiments of the present disclosure;

FIG. 11 is an exemplary wearing schematic of an acoustic output device according to other embodiments of the present disclosure;

FIG. 12 is a schematic diagram of an acoustic model formed from an acoustic output device according to further embodiments of the present disclosure;

FIG. 13 is a schematic illustration of the location of an acoustic output device and an ear according to some embodiments of the present disclosure;

FIG. 14 is a schematic diagram of the distribution of high frequency sound waves when the high frequency acoustic unit is disposed protruding from the housing, according to some embodiments of the present disclosure;

FIG. 15 is a schematic diagram of the distribution of high frequency sound waves when the high frequency acoustic unit is embedded in a housing according to some embodiments of the present disclosure;

fig. 16 is a schematic view of directivity of a high-frequency acoustic unit shown in some embodiments of the present disclosure when the high-frequency acoustic unit is in a different position from the housing;

FIG. 17 is a schematic diagram of a frequency response of a high frequency acoustic unit shown in some embodiments of the present disclosure in a different position from a housing;

fig. 18A-18D are schematic diagrams of high frequency acoustic units shown disposed in housings corresponding to different positions according to some embodiments of the present disclosure;

Fig. 19A is a schematic diagram of a frequency response curve of an acoustic output device with high frequency acoustic units disposed at different positions according to some embodiments of the present disclosure;

fig. 19B is an enlarged schematic view of the middle and high frequency curve of fig. 19A.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present specification, the drawings used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some examples or embodiments of the present specification, and it is possible for those of ordinary skill in the art to apply the present specification to other similar situations according to the drawings without inventive effort. It should be understood that these exemplary embodiments are presented merely to enable one skilled in the relevant art to better understand and practice the present description, and are not intended to limit the scope of the present description in any way. Unless otherwise apparent from the context of the language or otherwise specified, like reference numerals in the figures refer to like structures or operations.

As used in this specification and the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment" and the term "another embodiment" means "at least one other embodiment".

In the description of the present specification, it should be understood that the azimuth or positional relationship indicated by the terms "front", "rear", "ear-hanging", "rear-hanging", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present specification and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present specification.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present specification, the meaning of "plurality" means at least two, for example, two, three, etc., unless explicitly defined otherwise.

In the present specification, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements or in interaction with each other, unless explicitly stated otherwise. The specific meaning of the above terms in this specification will be understood by those of ordinary skill in the art in view of the specific circumstances.

The embodiment of the specification provides an acoustic output device, and it includes casing and bearing structure, wears the casing near but not blocks up the position of ear canal mouth with the user's ear canal through bearing structure to make the user's ear canal keep open, make the user can receive external sound at the in-process that uses acoustic output device, promote user's use experience. The low-frequency acoustic unit and the high-frequency acoustic unit are arranged in the shell, at least two sound guide holes are arranged on the shell, two sound guide holes (for example, a first sound guide hole and a second sound guide hole) in the at least two sound guide holes are respectively and acoustically coupled with two sides of a vibrating diaphragm of the low-frequency acoustic unit, the low-frequency acoustic unit radiates sound to the outside of the shell through the two sound guide holes, one sound guide hole in the at least two sound guide holes is acoustically coupled with one side of the vibrating diaphragm of the high-frequency acoustic unit, the high-frequency acoustic unit radiates sound to the outside of the shell through the one sound guide hole, and when the high-frequency acoustic unit is in a wearing state, the corresponding sound guide holes of the high-frequency acoustic unit face to the auditory canal of a user. Through setting up high-frequency acoustic unit and making its sound guide hole towards user's ear canal, can improve user's ear canal's high frequency (for example be greater than 8 kHz) sound volume, make up the output of acoustic output device in middle-high frequency channel (for example be greater than 8 kHz's frequency channel not enough for acoustic output device has better acoustic output effect in full frequency channel.

Fig. 1 is a schematic illustration of an exemplary pinna, shown according to some embodiments of the application. Referring to fig. 1, pinna 100 may include ear canal 101, concha cavity 102, concha boat 103, triangular fossa 104, antitragus 105, auricle 106, auricle 107, earlobe 108, and auricle 109. For convenience of description, the upper and lower antihelix feet 1011 and 1012 and the antihelix 105 are collectively referred to as the antihelix region in the embodiment of the present specification. In some embodiments, the wearing and stabilization of the acoustic device may be accomplished by means of one or more portions of the pinna 100. In some embodiments, the ear canal 101, the concha cavity 102, the concha boat 103, the triangular fossa 104 and other parts have a certain depth and volume in the three-dimensional space, and can be used for realizing the wearing requirement of the acoustic device. For example, an acoustic device (e.g., an in-ear earphone) may be worn in the ear canal 101. In some embodiments, the wearing of the acoustic device may be accomplished by other locations in the pinna 100 than the ear canal 101. For example, the wearing of the acoustic device may be accomplished by means of a concha 103, triangular fossa 104, antihelix 105, arhat 106, helix 107, etc. or a combination thereof. In some embodiments, to improve the comfort and reliability of the acoustic device in terms of wearing, the earlobe 108 of the user may be further utilized. By enabling the wearing of the acoustic device and the propagation of sound by means of other parts of the pinna 100 than the ear canal 101, the user's ear canal 101 can be "liberated" and the influence of the acoustic device on the user's ear health can be reduced. When the user wears the acoustic device on the road, the acoustic device does not block the user's ear canal 101, and the user can receive both sound from the acoustic device and sound from the environment (e.g., whistling, ringing, surrounding people, traffic sounds, etc.), so that the occurrence probability of traffic accidents can be reduced. For example, when the acoustic device is worn by a user, the entire or partial structure of the acoustic device may be located on the front side of the auricle 109 (e.g., region M ₃ enclosed by a dashed line in fig. 1). for another example, when the acoustic device is worn by a user, the acoustic device may be in contact with an upper portion of the ear canal 101 (e.g., where one or more of the auricle 109, concha 103, triangular fossa 104, antitragus 105, otoboat 106, auricle 107, etc. are located). As another example, when the acoustic device is worn by a user, the acoustic device may be located in whole or in part within one or more portions of the auricle (e.g., the concha chamber 102, the concha vessel 103, the triangular fossa 104, etc.) (e.g., the area M ₁ enclosed by the dashed lines in fig. 1 that includes at least the concha vessel 103, the triangular fossa 104, and the area M ₂ that includes at least the concha chamber 102).

Individual differences may exist for different users, resulting in different dimensional differences in shape, size, etc. of pinna 100. For ease of description and understanding, the present specification will further describe the manner in which the acoustic devices of the various embodiments are worn on an auricle model having a "standard" shape and size, unless otherwise specified, primarily by reference thereto. For example, simulators made based on ANSI: S3.36, S3.25 and IEC:60318-7 standards, such as GRAS45BCKEMAR, with their head and their (left and right) pinna 100, can be used as references for wearing acoustic devices, thereby presenting a scenario where most users wear acoustic devices normally. In the present application, descriptions such as "user wearing", "in wearing state", and "in wearing state" may refer to the acoustic device of the present application being worn on the auricle 100 of the aforementioned simulator. Of course, in consideration of individual differences among different users, the structure, shape, size, thickness, etc. of one or more parts of the auricle 100 may be differently designed according to auricles 100 of different shapes and sizes, and these differently designed may be represented as characteristic parameters of one or more parts of the acoustic device (e.g., a case, a support structure, etc. hereinafter) may have different ranges of values, thereby accommodating different auricles 100. The "non-wearing state" is not limited to a state in which the earphone is not worn on the auricle 100 of the user, but includes a state in which the earphone is deformed by an external force, and the "wearing state" is not limited to a state in which the earphone is worn on the auricle 100 of the user, and the support structure and the housing may be regarded as being worn when the support structure and the housing are swung out to the same state as when the respective structures are worn (e.g., the respective structures are kept at the same distance).

In the fields of medicine, anatomy and the like, three basic tangential planes of a sagittal plane (SAGITTALPLANE), a coronal plane (CoronalPlane) and a horizontal plane (HorizontalPlane) of a human body, and three basic axes of a sagittal axis (SagittalAxis), a coronal axis (CoronalAxis) and a vertical axis (VerticalAxis) can be defined. The sagittal plane refers to a section perpendicular to the ground, which is made along the front-back direction of the body, and divides the human body into two parts, namely, a left-right section, a coronal plane refers to a section perpendicular to the ground, which is made along the left-right direction of the body, and divides the human body into two parts, namely, a front-back section, and a horizontal plane refers to a section parallel to the ground, which is made along the up-down direction of the body, and divides the human body into two parts, namely, an up-down section. Accordingly, the sagittal axis refers to an axis along the anterior-posterior direction of the body and perpendicular to the coronal plane, the coronal axis refers to an axis along the lateral direction of the body and perpendicular to the sagittal plane, and the vertical axis refers to an axis along the superior-inferior direction of the body and perpendicular to the horizontal plane. Further, the term "front side of the auricle" as used herein is a concept of "rear side of the auricle" in relation to the auricle, the former meaning the side of the auricle facing away from the head, and the latter meaning the side of the auricle facing toward the head, all for the user's auricle. The auricle of the simulator is observed along the direction of the coronal axis of the human body, so that a schematic diagram of the front side of the auricle shown in fig. 1 can be obtained.

The above description of pinna 100 is for illustrative purposes only and is not intended to limit the scope of the present application. Various changes and modifications may be made by one of ordinary skill in the art in light of the description of the application. For example, part of the structure of the acoustic device may mask part or all of the ear canal 101. Such variations and modifications are intended to be within the scope of the present application.

Fig. 2 is an exemplary frame diagram of an acoustic output device according to some embodiments of the present description, and fig. 3 is an exemplary wearing schematic diagram of an acoustic output device according to some embodiments of the present description.

In some embodiments, the acoustic output device 10 may include eyeglasses, smart bracelets, headphones, hearing aids, smart helmets, smart watches, smart clothing, smart backpacks, smart accessories, and the like, or any combination thereof. For example, the acoustic output device 10 may be a pair of functional glasses such as a pair of myopia glasses, presbyopic glasses, riding glasses, sunglasses, or the like, or may be an intelligent pair of glasses such as an audio glasses having a headphone function, and the acoustic output device 10 may be a head-mounted device such as a helmet, an augmented Reality (Augmented Reality, AR) device, or a Virtual Reality (VR) device. In some embodiments, the augmented reality device or virtual reality device may include a virtual reality helmet, virtual reality glasses, augmented reality helmet, augmented reality glasses, or the like, or any combination thereof. For example, the virtual reality device and/or the augmented reality device may include Google Glass, oculus Rift, hololens, gear VR, and the like.

Referring to fig. 2 and 3, in some embodiments, the acoustic output device 10 may include a housing 11, a support structure 12, a low frequency acoustic unit 13, and a high frequency acoustic unit 14. The supporting structure 12 is connected with the housing 11, the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are both disposed in the housing 11, and the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 cooperate to realize acoustic output of the acoustic output device 10.

The housing 11 is connected to the support structure 12 for carrying the low frequency acoustic unit 13 and the high frequency acoustic unit 14. In some embodiments, the housing 11 may be a closed housing structure having a hollow interior, and the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are located inside the housing 11. In some embodiments, the acoustic output device 10 may be incorporated with products such as eyeglasses, headphones, head mounted display devices, AR/VR helmets, and the like, in which case the housing 11 may be secured in a hanging or clamping manner about the user's pinna 100. In some alternative embodiments, a hanging structure (e.g., a hanger) may be provided on the housing 11. For example, the shape of the hook matches the shape of the auricle, and the acoustic output device 10 can be independently worn on the auricle 100 of the user by the hook.

In some embodiments, the housing 11 may be a housing structure having a shape that is adapted to the human auricle 100, for example, a circular ring shape, an oval shape, a racetrack shape, a polygonal shape (regular or irregular), a U shape, a V shape, a semicircular shape, etc., regular or irregular shape, so that the housing 11 may be directly hung at the auricle 100 of the user. In some embodiments, housing 11 may also include a securing structure. The securing structure may include an ear hook, an elastic band, etc., so that the acoustic output device 10 may be better worn on the user to prevent the user from falling off during use.

In some embodiments, the housing 11 may have a long axis direction X, a short axis direction Y, and a thickness direction Z that are orthogonal to each other. The long axis direction X may be defined as a direction having a larger extension (for example, when the projection shape is rectangular or approximately rectangular, the long axis direction is the length direction of the rectangle or approximately rectangle) among the shapes of the two-dimensional projection surfaces of the housing 11 (for example, the projection of the housing 11 on the plane on which the inner side surface (side surface close to the auricle 100) is located, or the projection on the sagittal plane). For ease of description, this description will be described in terms of a projection of the shell onto the sagittal plane. The short axis direction Y may be defined as a direction perpendicular to the long axis direction X in a shape of the housing 11 projected on the sagittal plane (for example, when the projected shape is rectangular or nearly rectangular, the short axis direction is a width direction of the rectangle or nearly rectangle). The thickness direction Z may be defined as a direction perpendicular to the sagittal plane, e.g., coincident with the direction of the coronal axis, all pointing in a direction to the left and right of the body.

Referring to fig. 1, 2 and 3, in some embodiments, at least a portion of housing 11 may be located in fig. 1 to illustrate an area M ₃ on the anterior side of the tragus or an anterolateral area M ₁ and an area M ₂ of the pinna in user's ear 100 when the acoustic output device 10 is worn by a user. In the embodiments of the present disclosure, the front lateral surface of the auricle refers to a side of the auricle facing away from the head in the coronal axis direction, and the rear medial surface of the auricle refers to a side of the auricle facing toward the head in the coronal axis direction. In some embodiments, the housing 11 may be provided with at least two sound guiding holes for transmitting sound. In some embodiments, two of the at least two sound guiding holes are respectively acoustically coupled to two sides of the diaphragm of the low-frequency acoustic unit 13, and the low-frequency acoustic unit 13 radiates sound to the outside of the housing 11 through the two sound guiding holes. One of the at least two sound guiding holes is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, through which the high-frequency acoustic unit 14 radiates sound to the outside of the housing 11, and in a wearing state, the corresponding sound guiding hole of the high-frequency acoustic unit 14 faces the ear canal of the user.

In some embodiments, the housing 11 may be located on a side of the user's ear facing the facial region of the human body in the sagittal axis direction, i.e., the position of solid line box a in fig. 3, in the worn state. At this time, the housing 11 is positioned at the human face region M ₃ on the front side of the user's ear, the long axis of the housing 11 may be in a vertical or nearly vertical state, the projection of the short axis direction Y on the sagittal plane coincides with the direction of the sagittal axis, the projection of the long axis direction X on the sagittal plane coincides with the vertical axis direction, and the thickness direction Z is perpendicular to the sagittal plane. In some embodiments, when the housing 11 is in an inclined state (e.g., the position shown by the dashed box B in fig. 3) in the wearing state, the long axis direction X is still parallel or approximately parallel to the sagittal plane, the long axis direction X may have an angle with the direction of the sagittal axis, i.e., the long axis direction X is also correspondingly inclined, the short axis direction Y may have an angle with the direction of the vertical axis, i.e., the short axis direction Y is also inclined, and the thickness direction Z is perpendicular to the sagittal plane. At this time, the acoustic output device 10 is located in the area where the M ₂ is located, and since the concha cavity 102 has a certain volume and depth, a certain space is formed between the inner side surface of the acoustic output device 10 and the concha cavity, and the ear canal can be communicated with the outside through the leakage structure between the inner side surface and the concha cavity, so as to liberate the ears of the user. at the same time, the housing 11 of the acoustic output device 10 and the concha cavity may cooperate to form an auxiliary cavity in communication with the ear canal. In some embodiments, at least one sound guiding hole may be at least partially located in the auxiliary cavity, and the sound guided by the sound guiding hole may be limited by the auxiliary cavity, that is, the auxiliary cavity may gather sound, so that the sound may be more propagated into the ear canal, thereby improving the volume and quality of the sound heard by the user in the near field, and thus improving the acoustic effect of the acoustic output device 10. In some embodiments, the shell 11 may also be in a horizontal or approximately horizontal state when worn, such as the position shown by the dashed box C in fig. 3, where the shell 11 is at least partially located at the antitragus 105, the long axis direction X of the shell 11 may be coincident or approximately coincident with the sagittal axis direction, and all points in the anterior-posterior direction of the body, the short axis direction Y may be coincident or approximately coincident with the vertical axis direction, and all points in the superior-inferior direction of the body, and the thickness direction Z is perpendicular to the sagittal plane. Thus, the shell 11 can be prevented from shielding the auditory canal, and thus the ears of a user are liberated, and the contact area between the shell 11 and the auricle 100 can be increased, so that the wearing comfort of the earphone 10 is improved. It should be noted that, in the wearing state, the case 11 shown in the position of the dashed box C is in an approximately horizontal state, which may mean that the angle between the long axis direction X and the sagittal axis of the case 11 shown in the position of the dashed box C in fig. 3 is within a specific range (for example, not more than 20 °). The wearing position of the housing 11 is not limited to the position A, B, C shown in fig. 3, and may be satisfied in the region M ₃, the region M ₁, or the region M ₂ shown in fig. 1. For example, the whole or part of the structure of the housing 11 may be located in a region M ₃ surrounded by a broken line in fig. 1. For another example, the entire or partial structure of the housing 11 may be in contact with an upper portion of the ear canal 101 (e.g., where one or more of the auricle 109, concha 103, triangular fossa 104, antitragus 105, auricle 106, auricle 107, etc. are located). As another example, the entire or partial structure of the housing 11 may be located within a cavity (e.g., the area M ₁ enclosed by the dashed lines in fig. 1 that includes at least the concha 103, the triangular fossa 104, and the area M ₂ that includes at least the concha 102) formed by one or more portions of the auricle 100 (e.g., the concha cavity 102, the concha 103, the triangular fossa 104, etc.).

In some embodiments, the support structure 12 is configured to wear the housing 11 in a position near the ear canal of the user but not blocking the ear canal orifice, such that the pinna 100 of the user remains open while the user can hear the sound output by the acoustic output device 10 while also capturing the sound of the external environment. For example, the acoustic output device 10 may be disposed circumferentially or partially circumferentially around the user's pinna 100 and may transmit sound by way of air conduction or bone conduction. In some embodiments, the support structure 12 may be correspondingly different depending on the type of acoustic output device 10. Illustratively, the support structure 12 may be an ear hook when the acoustic output device 10 is an earphone, the support structure 12 may be a temple when the acoustic output device 10 is eyeglasses, the support structure 12 may be an annular band when the acoustic output device 10 is a bracelet, the support structure 12 may be a helmet when the acoustic output device 10 is a headset, or the like.

In some embodiments, taking acoustic output device 10 as an example of an open earphone, the corresponding support structure 12 may be an ear-hook, which may include a first portion 121 and a second portion 122, with first portion 121 and second portion 122 connected in sequence. In the worn state, the first portion 121 of the support structure 12 is suspended between the pinna and the head of the user, and the second portion 122 extends towards the side of the pinna facing away from the head and connects to the housing 11, wearing the housing 11 in a position near the ear canal but not blocking the ear canal.

In some embodiments, to improve the stability of the acoustic output device 10 in the worn state, the acoustic output device 10 may employ any one or combination of the following. First, at least a portion of the support structure 12 is configured as a contoured structure that conforms to at least one of the back side and the head of the pinna 100 to increase the contact area of the support structure 12 with the pinna 100 and/or the head, thereby increasing the resistance to the acoustic output device 10 falling off of the pinna 100. Secondly, at least part of the support structure 12 is configured as a resilient structure having a certain amount of deformation in the worn state to increase the positive pressure of the support structure 12 against the auricle 100 and/or the head, thereby increasing the resistance of the acoustic output device 10 to detachment from the auricle 100. Third, support structure 12 is at least partially configured to rest against the head in a worn state, causing a reaction force against auricle 100 to cause housing 11 to press against the front exterior side of auricle 100 (e.g., region M ₁ and region M ₂ shown in FIG. 1), thereby increasing the resistance to acoustic output device 10 falling off auricle 100. Fourth, the housing 11 and the support structure 12 are arranged to sandwich the region where the antitragus 105 is located, the region where the concha cavity is located, and the like from both the front outer side surface and the rear inner side surface of the auricle 100 in the worn state, thereby increasing the resistance against the acoustic output device 10 coming off from the auricle 100. Fifth, the housing 11 or ancillary structures connected thereto are configured to extend at least partially into the concha chamber 102, concha boat 103, triangular fossa 104, and ear boat 106, etc., thereby increasing the resistance to the acoustic output device 10 falling off of the auricle 100.

In some embodiments, support structure 12 may have an arcuate configuration that fits over the intersection of the user's head and pinna 100, such that support structure 12 may hang between the user's pinna 100 and the head. Illustratively, the first portion 121 of the support structure 12 connects the second portion 122 with the housing 11 such that the acoustic output device 10 is curved in three dimensions when in a non-worn state (i.e., a natural state). In other words, in three dimensions, the second portion 122, the first portion 121, and the housing 11 are not coplanar. So configured, the second portion 122 may be hung between the back side of the user's pinna 100 and the head when the acoustic output device 10 is in the worn state, the housing 11 may be in contact with the front side of the user's pinna 100 (e.g., region M ₃ in fig. 1) or the pinna 100 (e.g., region M ₁, region M ₂ in fig. 1), and the housing 11 and the second portion 122 may cooperate to grip the pinna 100. Specifically, first portion 121 may extend from the head to the outside of the head, and cooperate with second portion 122 to provide shell 11 with a compressive force against the front side of pinna 100 or pinna 100. The casing 11 may specifically press against the front side of the auricle 100 or the area where the concha cavity 102, the concha boat 103, the triangular fossa 104, the antitragus 105 and other parts are located under the action of the pressing force, so that the acoustic output device 10 does not cover the ear canal 101 of the auricle 100 when in the wearing state.

In some embodiments, the low frequency acoustic unit 13 and the high frequency acoustic unit 14 may be used to convert signals containing sound information into sound signals. In some embodiments, the sound signal may include bone conduction sound waves or air conduction sound waves. For example, the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 may generate mechanical vibrations to output sound waves (i.e., sound signals) in response to receiving a signal containing sound information. In some embodiments, the low frequency acoustic unit 13 is an acoustic transducer having better acoustic output performance in a low frequency range so that the acoustic output device 10 has better low frequency output performance, and the high frequency acoustic unit 14 is an acoustic transducer having better acoustic output performance in a high frequency range so that the high frequency output performance of the acoustic output device 10 is improved. Wherein the low frequency range may refer to a frequency range of less than 8kHz and the high frequency range may refer to a frequency range of greater than 8 kHz. In some embodiments, the low frequency range and the high frequency range may also have different criteria based on the actual situation. For example, the low frequency range may also refer to a frequency range of not higher than 1kHz, such as 1Hz-1kHz, 100Hz-800Hz, etc., and the high frequency range may also refer to a frequency range of not lower than 5kHz, such as 5kHz-10kHz, 8kHz-16kHz, etc.

In some embodiments, the types of low frequency acoustic elements 13 and high frequency acoustic elements 14 may include, but are not limited to moving coil transducers, moving iron transducers, flat plate transducers, piezoelectric transducers, and the like, depending on the operating principle. The moving coil transducer has higher transduction efficiency, higher sensitivity and better overall sound quality, but has poorer output effect in a high-frequency range. The moving iron type transducer has higher sensitivity, but the flat range of the frequency response curve is smaller, and the moving iron type transducer has precise structure, high cost, long and narrow structure and great design difficulty. The piezoelectric transducer has higher transduction efficiency and higher sensitivity, but needs high voltage to drive the piezoelectric element, and the frequency response curve is uneven at high frequency and has larger wave peaks and wave troughs in the vibration mode. The vibrating diaphragm of the flat-plate type transducer is uniformly stressed, so that the generation of split vibration is well avoided, the distortion of output sound is well avoided, and the output effect in a high-frequency range is good.

Based on the foregoing analysis, in some embodiments, the low frequency acoustic unit 13 may employ a moving coil transducer such that the low frequency acoustic unit 13 has a better acoustic output in the low frequency range. In some embodiments, the high frequency acoustic unit 14 may employ a flat panel transducer to provide a better acoustic output of the high frequency acoustic unit 14 in the high frequency range.

In some embodiments, the minimum resonant frequency for the high frequency acoustic unit 14 is no less than 5kHz and the minimum resonant frequency for the low frequency acoustic unit 13 is no more than 1kHz. By the arrangement, the low-frequency acoustic unit 13 can have larger output in the frequency range of middle and low frequencies (for example, 1kHz-8 kHz), and the high-frequency acoustic unit 14 can have larger output in the frequency range of high frequencies (for example, the frequency range of more than 8 kHz), so that the acoustic output device 10 has better acoustic output effect in the full frequency range (for example, the frequency range of more than 1 kHz).

In some embodiments, in order for the acoustic output device 10 to have a high acoustic output effect over a wide frequency range, the difference between the minimum resonance frequency of the high-frequency acoustic unit 14 and the minimum resonance frequency of the low-frequency acoustic unit 13 may be not less than 4kHz, or the ratio of the minimum resonance frequency of the high-frequency acoustic unit 14 to the minimum resonance frequency of the low-frequency acoustic unit 13 may be not less than 5. In some embodiments, in order to further provide the acoustic output device 10 with a higher acoustic output effect in the frequency range of the middle and low frequencies, the minimum resonance frequency corresponding to the low frequency acoustic unit 13 may be smaller, the difference between the minimum resonance frequency of the high frequency acoustic unit 14 and the minimum resonance frequency of the low frequency acoustic unit 13 may be not less than 6kHz, or the ratio of the minimum resonance frequency of the high frequency acoustic unit 14 and the minimum resonance frequency of the low frequency acoustic unit 13 may be not less than 10. In some embodiments, in order to further provide the acoustic output device 10 with a higher acoustic output effect in the frequency range of the high frequency, the minimum resonance frequency corresponding to the high frequency acoustic unit 14 may be larger, the difference between the minimum resonance frequency of the high frequency acoustic unit 14 and the minimum resonance frequency of the low frequency acoustic unit 13 may be not less than 8kHz, or the ratio of the minimum resonance frequency of the high frequency acoustic unit 14 and the minimum resonance frequency of the low frequency acoustic unit 13 may be not less than 20.

Fig. 4 is a schematic view of the interior of a housing according to some embodiments of the present disclosure, fig. 5A is a schematic view of the frequency response of an acoustic output device according to some embodiments of the present disclosure in different situations, and fig. 5B is an enlarged schematic view of the high frequency curve of fig. 5A. As shown in fig. 5A and 5B, a curve L ₅₂ represents a frequency response curve of the acoustic output device 10 when only the low-frequency acoustic unit 13 is operated, a curve L ₅₃ represents a frequency response curve of the acoustic output device 10 when only the high-frequency acoustic unit 14 is operated, and a curve L ₅₄ represents a frequency response curve of the acoustic output device 10 when the low-frequency acoustic unit 13 is operated simultaneously with the high-frequency acoustic unit 14. In some embodiments, as shown in fig. 4, the low frequency acoustic unit 13 may be disposed within the housing 11, and the high frequency acoustic unit 14 may be disposed within the housing 11 and protrude from the surface of the housing 11. The low-frequency acoustic unit 13 is a moving coil type transducer, the high-frequency acoustic unit 14 is a flat plate type transducer, and the resonance frequency of the high-frequency acoustic unit 14 can be 8kHz. The input signals of the low frequency acoustic unit 13 and the high frequency acoustic unit 14 are both 0.5V in voltage and the same in phase. In some embodiments, the frequency response curves in fig. 5A and 5B may be measured by a microphone, where the microphone is disposed at a position 4mm away from the sound guiding hole corresponding to the ear canal of the user in the wearing state, and the direction is the direction in which the corresponding sound guiding hole points to the ear of the user in the wearing state. When the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 operate simultaneously, the positions of the corresponding sound guiding holes may be intermediate positions (for example, the middle point of the line connecting the centers of the two sound guiding holes) of the two sound guiding holes corresponding to the low-frequency acoustic unit 13, which are close to the ear canal of the user in the wearing state, and the sound guiding holes corresponding to the high-frequency acoustic unit 14. When the sound guiding hole corresponding to the high-frequency acoustic unit 14 is completely overlapped with one of the two sound guiding holes corresponding to the low-frequency acoustic unit 13, the microphone setting position is the center position of the larger sound guiding hole of the two overlapped sound guiding holes.

As shown in fig. 5A and 5B, in the frequency range of the low frequency (for example, 800Hz or less), the curve L ₅₂ substantially coincides with the curve L ₅₄, which means that the sound of the acoustic output device 10 at the low frequency (for example, 800Hz or less) is mainly output by the low-frequency acoustic unit 13, and the influence of the arrangement of the high-frequency acoustic unit 14 on the output of the low-frequency acoustic unit 13 at the low frequency is negligible. The sharp attenuation of curve L ₅₂ starts at 7kHz, indicating poor output performance of the low frequency acoustic unit 13 in the high frequency (e.g. above 8 kHz) frequency range. Curve L ₅₃, which is a steady boost in output after 1.2kHz at lower frequencies, remains in a higher position after 7kHz, and attenuates less, indicating that the high frequency acoustic unit 14 has better output performance at high frequencies (e.g., above 8 kHz). The curve L ₅₄ can be regarded as a curve after the curve L ₅₂ and the curve L ₅₃ are superimposed and fitted, the curve L ₅₃ provides compensation for the curve L ₅₂ in an attenuation section (for example, above 7 kHz), the curve L ₅₄ is substantially coincident with the curve L ₅₂ before 7kHz, and the curve L ₅₄ is substantially coincident with the curve L ₅₃ after 7kHz, which indicates that the high-frequency acoustic unit 14 is additionally arranged in the acoustic output device 10, so that the output sound pressure level of high frequency (for example, above 8 kHz) can be stably increased while the low-frequency output effect of the acoustic output device 10 is ensured, and thus the acoustic output device 10 has a better output effect in the full frequency band. Meanwhile, the curve L ₅₄ and the curve L ₅₂ are compared, and in the frequency range above 8kHz, the curve L ₅₄ is 10dB-15dB higher than the curve L ₅₂, which shows that the arrangement of the high-frequency acoustic unit 14 can improve the output sound pressure level of the acoustic output device 10 by 10dB-15dB at high frequency (for example, above 8 kHz), and the high-frequency improving effect is quite remarkable.

In some embodiments, the housing 11 is provided with at least two sound guiding holes, where two sound guiding holes (e.g. the first sound guiding hole 111 and the second sound guiding hole 112) of the at least two sound guiding holes are respectively acoustically coupled to two sides of the diaphragm of the low-frequency acoustic unit 13, and the low-frequency acoustic unit 13 radiates sound to the outside of the housing 11 through the two sound guiding holes (e.g. the first sound guiding hole 111 and the second sound guiding hole 112). When the low-frequency acoustic unit 13 outputs sound waves, the sound waves (or referred to as first sound waves) on one side of the diaphragm of the low-frequency acoustic unit 13 may be emitted through one of the two sound guiding holes, and the sound waves (or referred to as second sound waves) on the other side of the diaphragm of the low-frequency acoustic unit 13 may be emitted through the other of the two sound guiding holes. In some embodiments, the two sound guiding holes may emit two sets of sound waves with a phase difference (e.g., opposite phases) to form a dipole, and the dipole may perform interference cancellation at a spatial point (e.g., the far field of the acoustic output device 10), so that the problem of leakage of the far field of the acoustic output device 10 in the middle-low frequency range (e.g., 100Hz-800 Hz) is effectively improved.

In some embodiments, one of the at least two sound guiding holes may be acoustically coupled to a diaphragm side of the high-frequency acoustic unit 14, through which the high-frequency acoustic unit 14 radiates sound to the outside of the housing 11, and in the wearing state, the corresponding sound guiding hole of the high-frequency acoustic unit 14 faces the ear canal of the user. The high-frequency acoustic unit 14 outputs an acoustic wave (or referred to as a third acoustic wave) to the outside of the housing 11 through only one sound guide hole, forming a monopole. In some embodiments, in the middle-high frequency range (for example, 800Hz-10 kHz), the monopole is designed, so that the directivity of the high-frequency acoustic unit 14 is better, and in combination with the setting of the corresponding sound guiding hole towards the ear canal of the user, the listening effect of the ear of the user to the third sound wave output by the high-frequency acoustic unit 14 can be improved, so that the mouth of the ear canal of the user can receive a larger volume, and the user can obtain a clear listening effect. By arranging the high-frequency acoustic unit 14 and the corresponding sound guide holes, the output sound pressure level of the acoustic output device 10 at high frequency (for example, 8kHz-16 kHz) can be improved, and the full-frequency output effect of the acoustic output device 10 is ensured.

In some embodiments, the sound guiding holes corresponding to the high-frequency acoustic unit 14 may be the third sound guiding holes (e.g., the third sound guiding hole 113) different from the two sound guiding holes corresponding to the low-frequency acoustic unit 13 (e.g., the first sound guiding hole 111 and the second sound guiding hole 112), that is, the third sound guiding hole (e.g., the third sound guiding hole 113) is not overlapped with the two sound guiding holes (e.g., the first sound guiding hole 111 and the second sound guiding hole 112), so that the design position of the third sound guiding hole (e.g., the third sound guiding hole 113) is flexible, the installation flexibility of the high-frequency acoustic unit 14 is improved, and the third sound guiding hole corresponding to the high-frequency acoustic unit 14 can be closer to the ear canal of the user in the wearing state, so as to ensure the high-frequency output effect. In some embodiments, the sound guiding hole corresponding to the high-frequency acoustic unit 14 may also be one of the two sound guiding holes corresponding to the low-frequency acoustic unit 13 (for example, the first sound guiding hole 111 and the second sound guiding hole 112), that is, the sound guiding hole corresponding to the high-frequency acoustic unit 14 may partially coincide or completely coincide with one of the two sound guiding holes corresponding to the low-frequency acoustic unit 13 (for example, the first sound guiding hole 111 and the second sound guiding hole 112), which simplifies the structural design and ensures the consistency of the output of the high-frequency learning unit 14 and the low-frequency acoustic unit 13. In some embodiments, when the sound guiding hole corresponding to the high-frequency acoustic unit 14 is a third sound guiding hole (e.g., third sound guiding hole 113) different from the two sound guiding holes corresponding to the low-frequency acoustic unit 13 (e.g., first sound guiding hole 111, second sound guiding hole 112), the third sound guiding hole may be non-coincident (i.e., non-coincident) or partially coincident with one of the two sound guiding holes corresponding to the low-frequency acoustic unit 13 (e.g., first sound guiding hole 111 or second sound guiding hole 112). It should be noted that, when the third sound guiding hole is completely overlapped with one of the two sound guiding holes (for example, the first sound guiding hole 111 or the second sound guiding hole 112) corresponding to the low-frequency acoustic unit 13, the third sound guiding hole and the sound guiding hole that are completely overlapped with each other may be collectively regarded as one sound guiding hole.

It should be understood that the frame diagram provided in fig. 2 is for illustrative purposes only and is not intended to limit the scope of the present application. Various alterations and modifications will occur to those skilled in the art, guided by the application. And such variations and modifications are intended to be included within the scope of the present application. In some embodiments, the number of elements shown in the figures may be adjusted according to the actual situation. In some embodiments, one or more elements shown in fig. 2 may be omitted, or one or more other elements may be added or deleted. For example, the acoustic output device 10 may not include the support structure 12, and the case 11 may have a wearing fixing function of the support structure 12. In some embodiments, one element may be replaced by another element that performs a similar function. In some embodiments, one element may be split into multiple sub-elements, or multiple elements may be combined into a single element. For example, the housing 11 and the support structure 12 may be combined into one element.

Fig. 6 is a schematic view of an external outline of a housing according to some embodiments of the present disclosure, and fig. 7A-7C are schematic views of positions of a first sound guiding hole and a third sound guiding hole according to some embodiments of the present disclosure. As shown in fig. 4 and 6, in some embodiments, at least two sound guiding holes on the housing 11 may include a first sound guiding hole 111, a second sound guiding hole 112, and a third sound guiding hole 113. Wherein the first sound guiding hole 111 and the second sound guiding hole 112 are respectively and acoustically coupled with two sides of the diaphragm of the low-frequency acoustic unit 13. In some embodiments, the first sound guide hole 111 may be formed on a side of the case 11 facing the auricle, and the diaphragm of the low frequency acoustic unit 13 may partition the case 11 into a front cavity and a rear cavity, and the first sound guide hole 111 may communicate with the front cavity and guide sound generated from the front cavity out of the case 11 to the ear canal of the user so that the user can hear the sound. In some embodiments, a part of the sound guided out through the first sound guiding hole 111 may be propagated to the ear canal so that the user hears the sound, another part of the sound may be propagated to the outside of the acoustic output device 10 and the ear through the gap between the housing 11 and the ear (for example, a part of the concha cavity not covered by the housing 11) together with the sound reflected by the ear canal, so that a first leakage sound is formed in the far field, meanwhile, the other side surface (for example, a side surface away from or facing away from the ear canal of the user) of the housing 11 may be provided with a second sound guiding hole 112, the second sound guiding hole 112 is farther away from the ear canal than the first sound guiding hole 111, the sound propagated out through the second sound guiding hole 112 generally forms a second leakage sound in the far field, the intensity of the first leakage sound is equivalent to the intensity of the second leakage sound, and the phase of the first leakage sound and the phase (near) of the second leakage sound are opposite to each other, so that the two can be in the far field opposite phase, and the acoustic output device 10 can advantageously realize the effect of lowering the acoustic output device at low frequency, and the acoustic output device has a dipole at low directivity (for example, at 10 Hz-800 Hz). In some embodiments, the third sound guiding hole 113 is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the third sound guiding hole 113 is disposed toward the ear canal of the user, and the high-frequency acoustic unit 14 outputs the third sound wave only through the third sound guiding hole 113, the third sound guiding hole 113 being a sound source of the third sound wave. Since the wavelength of the high-frequency sound wave generated by the high-frequency acoustic unit 14 is short, the wavelength is equivalent to the size of the third sound guide hole 113 through which the high-frequency acoustic unit 14 outputs the third sound wave, and the sound source of the third sound wave cannot be regarded as a point sound source but should be regarded as a plane sound source. The sound field received at a location in the far field of the acoustic output device 10 can be considered as a superposition of numerous point sources on the radiation plane where the surface source is located, and the third sound wave received at the receiving location is related to frequency and wavelength due to the difference in sound path between the point sources and the receiving location. The higher the frequency of the third sound wave, the sharper the sound field directivity of the high-frequency acoustic unit 14, and the better the directivity. The frequency of the third sound wave output by the high-frequency acoustic unit 14 through the third sound guiding hole 113 is higher, so that the directivity is also better, the listening effect of the ear of the user to the third sound wave output by the high-frequency acoustic unit 14 can be improved, and the output effect of the acoustic output device 10 in the full frequency band can be ensured.

In some embodiments, the first sound guide hole 111, the second sound guide hole 112, and the third sound guide hole 113 are located at different positions on the housing 11, respectively. In some embodiments, to enhance the volume of the user's ear canal opening, the first sound guide hole 111 and the third sound guide hole 113 may be disposed on the housing 11 closer to the user's ear canal opening, such as on a side wall of the housing 11 facing the user's ear canal opening. The second sound guiding hole 112 may be disposed on the housing 11 at a position far away from the ear canal opening of the user, for example, on a side wall of the housing 11 facing away from the ear canal opening of the user, so as to avoid destructive interference of the second sound wave guided by the second sound guiding hole with the first sound wave guided by the first sound guiding hole 111 near the ear canal opening of the user, thereby affecting the listening effect. In some embodiments, as shown in fig. 7A-7C, the first sound guiding hole 111 and the third sound guiding hole 113 may be disposed on the same side wall of the housing 11, so that the first sound guiding hole 111 and the third sound guiding hole 113 are both disposed towards the ear canal opening of the user, and the listening volume of the ear canal opening of the user is increased. In some embodiments, as shown in fig. 7A, on the side wall provided with the first sound guiding hole 111, the third sound guiding hole 113 may be disposed at any position except for the first sound guiding hole 111, which reduces the difficulty in designing the third sound guiding hole 113 towards the ear canal opening of the user, and also makes the setting position of the high-frequency acoustic unit 14 more flexible.

In some embodiments, the second sound guiding hole 112 and the first sound guiding hole 111 are respectively located at two sides of the diaphragm of the low-frequency acoustic unit 13, and the second sound guiding hole 112 is disposed opposite to and away from the ear canal opening of the user. For example, the first side wall of the housing 11 may face the ear canal opening of the user, the first sound guiding aperture 111 may be located on the first side wall of the housing 11, the second sound guiding aperture 112 may be located on a third side wall facing away from the ear canal opening of the user, opposite the first side wall, or the second sound guiding aperture 112 may be located on a second side wall facing away from the ear canal opening of the user, adjacent the first side wall, such that the first sound guiding aperture 111 faces the ear canal opening of the user and the second sound guiding aperture 112 faces away from the ear canal opening of the user in the worn state of the acoustic output device 10. The sound output from the first sound guiding hole 111 and the sound output from the second sound guiding hole 112, which satisfy a specific condition (for example, a phase difference of about 180 °), may form dipole-like radiation, and in the far field, the sound output from the first sound guiding hole 111 and the sound output from the second sound guiding hole 112 may be cancelled in opposite phases, thereby reducing the leakage sound volume of the low frequency acoustic unit 13 in the far field, and preventing the sound output from the acoustic output device 10 in the low frequency from being heard by persons nearby.

When the user wears the sound generating device, in order to ensure the volume of the sound at the user's ear canal opening and the effect of the low frequency acoustic unit 13 in reducing the leakage sound in the far field, the ratio between the distance between the second sound guiding hole 112 and the user's ear canal opening and the distance between the first sound guiding hole 111 and the user's ear canal opening may be increased as much as possible. In some embodiments, the ratio between the distance of the second sound guide hole 112 from the user's ear canal opening and the distance of the first sound guide hole 111 from the user's ear canal opening may be greater than 1.2. In some embodiments, to further ensure the volume of the sound at the user's ear canal opening and the leakage-reducing effect of the low frequency acoustic unit 13 in the far field, the ratio between the distance of the second sound guiding hole 112 from the user's ear canal opening and the distance of the first sound guiding hole 111 from the user's ear canal opening may be in the range of 1.2-8. In some embodiments, to further ensure the volume of the sound at the user's ear canal opening and the leakage-reducing effect of the low frequency acoustic unit 13 in the far field, the ratio between the distance of the second sound guiding hole 112 from the user's ear canal opening and the distance of the first sound guiding hole 111 from the user's ear canal opening may be in the range of 1.4-5. In some embodiments, to further ensure the volume of the sound at the user's ear canal opening and the leakage-reducing effect of the low frequency acoustic unit 13 in the far field, the ratio between the distance of the second sound guiding hole 112 from the user's ear canal opening and the distance of the first sound guiding hole 111 from the user's ear canal opening may be in the range of 1.5-2.5.

In some embodiments, to ensure that a user can hear a relatively large volume while wearing the acoustic output device 10, the first sound guide hole 111 should be located as small as possible from the user's ear canal opening. The distance between the first sound guiding hole 111 and the user ear canal opening refers to the distance between the center of the first sound guiding hole 111 and the centroid of the contour of the user ear canal opening. The distance between the first sound guiding hole 111 and the user's ear canal opening may be the distance between the center of the first sound guiding hole 111 and the center of the user's ear canal opening, or the distance between the center of the first sound guiding hole 111 and the plane of the user's ear canal opening. In some embodiments, the first sound guide hole 111 may be less than 4cm from the user's ear canal opening. In some embodiments, to further ensure the volume of the user's listening, the first sound guiding hole 111 may be less than 3cm from the user's ear canal opening. In some embodiments, to ensure that the ear canal opening is open, the first sound guiding hole 111 needs to be kept at a distance from the ear canal opening, and the distance between the first sound guiding hole 111 and the ear canal opening of the user may be in the range of 0.5cm-2.5cm. In some embodiments, to further ensure the opening of the ear canal opening, the first sound guiding aperture 111 may be located at a distance in the range of 1cm-3.1cm from the user's ear canal opening.

When the acoustic output device 10 is worn by a user, too small a distance between the second sound guiding hole 112 and the ear canal opening of the user may cause the sound output by the second sound guiding hole 112 near the ear canal opening of the user to cancel the sound output by the first sound guiding hole 111, so as to ensure the listening volume at the ear canal opening of the user and reduce the far-field leakage volume, in some embodiments, the distance between the second sound guiding hole 112 and the ear canal opening of the user may be greater than 1cm. In addition, the excessive distance between the first sound guiding hole 111 and the second sound guiding hole 112, or the excessive distance between the second sound guiding hole 112 and the ear canal opening may cause the volume of the sound generating device to be excessively large, which affects the wearing experience of the user, so as to ensure the wearing experience of the user, in some embodiments, the distance between the second sound guiding hole 112 and the ear canal opening of the user is less than 8cm. In some embodiments, to further ensure the low frequency output effect of the acoustic output device 10, the second sound guiding aperture 112 may be located at a distance ranging from 1.5cm to 7cm from the user's ear canal opening. In some embodiments, to further ensure the volume of the sound at the user's ear canal opening and the leakage-reducing effect of the low frequency acoustic unit 13 in the far field, the distance between the second sound guiding hole 112 and the user's ear canal opening may be in the range of 2.5cm-4cm.

In some embodiments, in order to avoid that the second sound wave emitted by the second sound guiding hole 112 and the first sound wave emitted by the first sound guiding hole 111 cancel in the near field to affect the listening quality of the user, the distance between the second sound guiding hole 112 and the first sound guiding hole 111 cannot be too close. The distance between the second sound guiding hole 112 and the first sound guiding hole 111 may refer to a distance between a center of the second sound guiding hole 112 and a center of the first sound guiding hole 111. In some embodiments, the second sound guide hole 112 may be 4mm-15.11mm from the first sound guide hole 111. In some embodiments, to further ensure the listening quality of the user, the second sound guiding hole 112 may be 8mm-10mm from the first sound guiding hole 111.

In some embodiments, the third sound guiding hole 113 is closer to the user's ear canal than the first sound guiding hole 111 and the second sound guiding hole 112, and in combination with the setting of the third sound guiding hole 113 towards the user's ear canal, the high-frequency sound received by the user's ear canal opening can be more, and the sound pressure level received by the user's ear canal opening is ensured to be sufficiently high, so that the high-frequency listening effect is ensured. In some embodiments, the third sound guiding hole 113 may be less than 2.5cm from the user's ear canal opening. In some embodiments, to further ensure the high frequency listening effect of the user, the distance of the third sound guiding hole 113 from the ear canal opening of the user may be less than 1cm. In some embodiments, to ensure that the ear canal opening is open, the third sound guiding hole 113 needs to be kept at a distance from the ear canal opening, and the distance between the third sound guiding hole 113 and the ear canal opening of the user may be in the range of 0.1cm-1.5cm. In some embodiments, to further ensure that the ear canal opening is open, the third sound guiding aperture 113 may be located at a distance ranging from 0.5cm to 2.5cm from the user's ear canal opening.

Referring to fig. 1, 3 and 6, in some embodiments, the housing 11 may include a sidewall (also referred to as a medial side IS) facing the anterior lateral side of the user's auricle and a sidewall (also referred to as a lateral side OS) facing away from the anterior lateral side of the user's auricle.

In some embodiments, in the worn state, medial side IS faces toward the pinna in thickness direction Z and lateral side OS faces away from the pinna in thickness direction Z. In some embodiments, housing 11 may also include a connection surface connecting medial side IS and lateral side OS. In the wearing state, the case 11 may be provided in a shape of a circle, an ellipse, a rounded square, a rounded rectangle, or the like, as viewed in the thickness direction Z. Wherein, when the housing 11 is provided in a circular shape, an oval shape, or the like, the connection surface may refer to an arc-shaped side surface of the housing 11, and when the housing 11 is provided in a rounded square shape, a rounded rectangle shape, or the like, the connection surface may include a lower side surface LS, an upper side surface US, and a rear side surface RS. Therefore, for convenience of description, the present embodiment is exemplarily described taking an example in which the housing 11 is provided in a rounded rectangle. Wherein the length of the housing 11 in the long axis direction X may be larger than the width of the housing 11 in the short axis direction Y. As shown in fig. 3 and 6, the housing 11 may have an upper side face US facing away from the ear canal 101 in the short axis direction Y and a lower side face LS facing toward the ear canal 101 in the wearing state, and a rear side face RS connecting the upper side face US and the lower side face LS, the rear side face RS being located at an end facing toward the rear of the brain in the long axis direction X in the wearing state.

In some embodiments, the high-frequency acoustic unit 14 and the low-frequency acoustic unit 13 may be stacked in the thickness direction Z, so that the first sound guiding hole 111 and the third sound guiding hole 113 may be located on the inner side IS, so that the first sound guiding hole 111 and the third sound guiding hole 113 can be close to the ear canal of the user, and further, the volume of the hearing sound of the ear canal of the user IS increased. The stacked design of the high-frequency acoustic unit 14 and the low-frequency acoustic unit 13 in the thickness direction Z means that the high-frequency acoustic unit 14 IS located above (e.g., directly above, laterally above, etc.) or below (e.g., directly below, laterally below, etc.) the low-frequency acoustic unit 13 in the thickness direction Z, that IS, the high-frequency acoustic unit 14 IS located closer to the outer side surface OS or the inner side surface IS than the low-frequency acoustic unit 13 in the thickness direction Z. In some embodiments, the second sound guiding hole 112 may be disposed on the side wall of the housing 11 away from the ear of the user (e.g., the upper side US, the rear side RS, the outer side OS, etc.), so that the second sound guiding hole 112 has a suitable distance from the ear canal opening of the user, so as to ensure the volume of the sound at the ear canal opening of the user and the leakage-reducing effect of the low frequency acoustic unit 13 in the far field.

Referring to fig. 7C, in some embodiments, the first sound guiding hole 111 may completely coincide with the third sound guiding hole 113. At this time, the first sound guiding hole 111 and the third sound guiding hole 113 may be regarded as one sound guiding hole, and the one with the larger area of the first sound guiding hole 111 and the third sound guiding hole 113 is the sound guiding hole. Taking the first sound guiding hole 111 as an example, the first sound guiding hole 111 is acoustically coupled to one side of the diaphragm of the low-frequency acoustic unit 13 and one side of the diaphragm of the high-frequency acoustic unit 14 at the same time, and the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 radiate sound to the ear canal of the user through the first sound guiding hole 111.

Referring to fig. 7B, in some embodiments, the first sound guiding hole 111 may also partially overlap with the third sound guiding hole 113. At this time, the first sound guiding hole 111 and the third sound guiding hole 113 may also be regarded as one sound guiding hole, and the sound guiding holes include a first area (i.e. the non-overlapping portion of the first sound guiding hole 111), a second area (i.e. the non-overlapping portion of the third sound guiding hole 113), and a third area (i.e. the overlapping portion of the first sound guiding hole 111 and the third sound guiding hole 113). The first and third regions of the sound guiding hole are simultaneously acoustically coupled to one side of the diaphragm of the low frequency acoustic unit 13, the low frequency acoustic unit 13 radiates sound to the ear canal of the user through the first and third regions of the sound guiding hole, the second and third regions of the sound guiding hole are simultaneously acoustically coupled to one side of the diaphragm of the high frequency acoustic unit 14, and the high frequency acoustic unit 14 radiates sound to the ear canal of the user through the second and third regions of the sound guiding hole.

Referring to fig. 7A, when the first sound guiding hole 111 and the third sound guiding hole 113 do not overlap, the third sound guiding hole 113 may be disposed at any position except for the first sound guiding hole 111, which reduces the difficulty in designing the third sound guiding hole 113 towards the ear canal opening of the user, and also makes the location of the high-frequency acoustic unit 14 more flexible. Meanwhile, the high-frequency acoustic unit 14 can be arranged in a protruding manner relative to the inner side surface IS of the shell 11, and can also be embedded in the corresponding shell 11 of the inner side surface IS, so that the installation flexibility of the high-frequency acoustic unit 14 IS further improved.

Referring to fig. 7B and fig. 7C, when there is a superposition portion between the first sound guiding hole 111 and the third sound guiding hole 113, the first sound guiding hole 111 and the third sound guiding hole 113 need to be in the same plane. At this time, the high-frequency acoustic unit 14 may be embedded in the inside IS corresponding case 11. The first sound guiding hole 111 and the third sound guiding hole 113 can be regarded as the same sound guiding hole, and the design of a single sound guiding hole simplifies the structure and reduces the processing and design difficulty. Meanwhile, since the high-frequency acoustic unit 14 is embedded in the shell 11, the high-frequency acoustic unit 14 does not protrude from the surface of the shell 11, so that the surface of the shell 11 is flat and the shape is attractive.

In some wearing states, since the third sound guiding hole 113 and the first sound guiding hole 111 are both disposed on the inner side IS, the high-frequency acoustic unit 14 IS disposed on the housing 11 corresponding to the inner side IS, and the high-frequency acoustic unit 14 may block the first sound guiding hole 111, so that the sound output by the low-frequency acoustic unit 13 through the first sound guiding hole 111 IS reduced, and the low-frequency listening volume at the ear canal of the user IS further affected. Therefore, the high-frequency acoustic unit 14 can be disposed so as to avoid the first sound guide hole 111 as much as possible.

In some embodiments, to avoid the high-frequency acoustic unit 14 shielding the first sound guiding hole 111 and ensure the low-frequency listening volume of the user, the overlapping ratio of the projection area of the high-frequency acoustic unit 14 on the inner side IS of the housing 11 and the projection area of the low-frequency acoustic unit 13 on the inner side IS of the housing 11 (i.e. the first sound guiding hole 111) may not exceed 10%, i.e. the ratio of the overlapping area to the area of the first sound guiding hole 111 may not exceed 10%. In some embodiments, to further ensure low-frequency volume at the ear canal of the user, the overlap ratio of the projected area of the high-frequency acoustic unit 14 on the inner side IS of the housing 11 to the projected area of the low-frequency acoustic unit 13 on the inner side IS of the housing 11 (i.e., the first acoustic guide hole 111) may not exceed 8%. In some embodiments, to further ensure low-frequency volume at the ear canal of the user, the overlapping ratio of the projected area of the high-frequency acoustic unit 14 on the inner side IS of the housing 11 to the projected area of the low-frequency acoustic unit 13 on the inner side IS of the housing 11 (i.e., the first acoustic guide hole 111) may not exceed 5%.

In order to make the high-frequency sound received by the ear canal opening of the user more, the sound pressure level received by the ear canal opening of the user is ensured to be large enough, so that the high-frequency listening effect is ensured. In some embodiments, in the worn state, on the medial side IS, the third sound guide hole 113 IS closer to the user's ear canal than the first sound guide hole 111. The position of the third sound guiding hole 113 corresponds to the arrangement position of the high-frequency acoustic unit 14 on the inner side IS of the housing 11, i.e. the high-frequency acoustic unit 14 IS closer to the user's ear canal than the first sound guiding hole 111. In some embodiments, the position of the high frequency acoustic unit 14 on the medial side IS may be characterized by the centroid of the projection of the high frequency acoustic unit 14 on the medial side IS, i.e. the centroid of the projection of the high frequency acoustic unit 14 on the medial side IS closer to the user's ear canal than the sound guiding aperture (first sound guiding aperture 111) of the medial side IS to the low frequency acoustic unit 13.

Fig. 8 is a schematic illustration of the wearing of a housing of an acoustic output device extending into a concha chamber according to some embodiments of the present description. Referring to fig. 8, in some embodiments, the housing 11 may have a connection end CE connected to the support structure 12, and when the acoustic output device 10 is in a wearing state, the first portion 121 of the support structure 12 is hung between the auricle and the head of the user, and the second portion 122 of the support structure 12 extends toward a side of the auricle away from the head and is connected to the connection end CE of the housing 11, so as to achieve clamping fixation of the housing 11.

By extending the housing 11 at least partially into the concha cavity 102, the volume of the sound at the listening position (e.g., at the ear canal), particularly at medium and low frequencies, can be increased while still maintaining a good far-field leakage cancellation effect. By way of example only, when the entire or partial structure of the housing 11 extends into the concha chamber 102, the housing 11 and the concha chamber 102 form a chamber-like structure (hereinafter simply referred to as a chamber-like structure), which in the illustrated embodiment may be understood as a semi-enclosed structure enclosed by the sides of the housing 11 together with the concha chamber 102 structure, such that the interior is not completely hermetically sealed from the outside environment, but rather has a leak structure (e.g., an opening, a slit, a duct, etc.) that is in acoustic communication with the outside environment. One or more sound guiding apertures, such as a first sound guiding aperture 111, may be provided on a side of the housing 11 that IS closer to or facing the ear canal of the user (e.g., the inner side IS) when the acoustic output device 10 IS worn by the user, and one or more sound guiding apertures, such as a second sound guiding aperture 112, may be provided on the other side of the housing 11 (e.g., the outer side RS facing away from or facing away from the ear canal of the user), the first sound guiding aperture 111 being acoustically coupled to the front cavity of the acoustic output device 10 and the second sound guiding aperture 112 being acoustically coupled to the rear cavity of the acoustic output device 10. The sound output by the first sound guiding hole 111 and the sound output by the second sound guiding hole 112 can be approximately regarded as two sound sources, the sound waves of the two sound sources have opposite phases, the inner wall corresponding to the shell 11 and the concha cavity 102 forms a cavity-like structure, wherein the sound source corresponding to the first sound guiding hole 111 is located in the cavity-like structure, and the sound source corresponding to the second sound guiding hole 112 is located outside the cavity-like structure, so as to form the acoustic model shown in fig. 9.

Fig. 9 is a schematic diagram of an acoustic model formed from the acoustic output device shown in some embodiments of the present description. As shown in fig. 9, a listening position and at least one sound source 401A may be contained in the cavity-like structure 402. "comprising" herein may mean that at least one of the listening position and the sound source 401A is inside the cavity-like structure 402, or that at least one of the listening position and the sound source 401A is at an inner edge of the cavity-like structure 402. The listening position may be equivalent to the entrance of the auricle canal, or may be an auricle acoustic reference point, such as an ear reference point (EAR REFERENCE point, ERP), a tympanic membrane reference point (ear-drum reference point, DRP), or may be an entrance structure leading to the listener, or the like. Since the sound source 401A is surrounded by the cavity-like structure 402, most of the sound radiated therefrom reaches the listening position by direct or reflected radiation. In contrast, without the cavity-like structure 402, the sound source 401A radiates sound that does not mostly reach the listening position. Thus, the arrangement of the cavity structure results in a significant increase in the volume of sound reaching the listening position. At the same time, only a small portion of the inverted sound radiated from the inverted sound source 401B outside the cavity-like structure 402 enters the cavity-like structure 402 through the leakage structure 403 of the cavity-like structure 402. This corresponds to the creation of a secondary sound source 401B' at the leak structure 403, which has a significantly smaller intensity than the sound source 401B and also significantly smaller intensity than the sound source 401A. The sound generated by the secondary sound source 401B' has a weak effect of anti-phase cancellation on the sound source 401A in the cavity, so that the volume of the sound at the sound listening position is remarkably increased. For leaky sound, the sound source 401A radiates sound to the outside through the leaky structure 403 of the cavity, which is equivalent to generating one secondary sound source 401A 'at the leaky structure 403, since almost all sound radiated by the sound source 401A is output from the leaky structure 403 and the dimensions of the cavity-like structure 402 are much smaller (differ by at least an order of magnitude) than the spatial dimensions of the estimated leaky sound, the intensity of the secondary sound source 401A' can be considered to be equivalent to the sound source 401A. For the outside space, the secondary sound source 401A' and the sound source 401B form a dual sound source, which eliminates leakage.

In a specific application scenario, the outer wall surface of the shell 11 IS generally a plane or a curved surface, while the outline of the concha cavity 102 of the user IS in an uneven structure, by extending the shell 11 into the concha cavity 102 in a part or whole structure, a cavity-like structure communicated with the outside IS formed between the shell 11 and the outline of the concha cavity 102, further, the first sound guiding hole 111 IS arranged at a position (such as an inner side IS) of the shell 11 facing the ear canal of the user and close to the edge of the concha cavity 102, and the second sound guiding hole 112 IS arranged at a position of the shell 11 facing away from or far from the ear canal, so that the acoustic model shown in fig. 9 can be constructed, and the user can improve the listening position of the user at the ear canal when wearing the acoustic output device 10, and reduce the far-field sound leakage effect.

As shown in fig. 8, when the housing 11 at least partially extends into the concha cavity, the housing 11 is disposed obliquely in the wearing state, and the description of the dashed box B in fig. 3 is specifically omitted herein. At this time, the connection end CE IS closer to the ear canal of the user, and the rear side RS IS farther from the ear canal of the user than the connection end CE, and because of the need to be in contact with the concha cavity, a portion of the inner side IS closer to the rear side RS may be in contact with the concha cavity. In some embodiments, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS closer to the connection end CE than the sound guiding hole (the first sound guiding hole 111) of the inner side IS to the low-frequency acoustic unit 13, so that the third sound guiding hole 113 IS closer to the ear canal of the user than the first sound guiding hole 111, and the directivity of the third sound guiding hole 113 IS ensured, thereby ensuring the listening effect of high frequency.

In some embodiments, when the housing 11 does not extend into the concha cavity, the housing 11 may also be disposed obliquely in the wearing state, and the corresponding connection end CE is closer to the ear canal of the user, and the rear side RS is farther from the ear canal of the user. At this time, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS closer to the connection end CE than the sound guiding hole (first sound guiding hole 111) of the low-frequency acoustic unit 13 on the inner side IS.

Fig. 10 is a schematic diagram of frequency response curves of acoustic output devices corresponding to different setting positions of the high-frequency acoustic unit according to some embodiments of the present disclosure. Referring to fig. 10, a curve L ₁₀₁ shows a frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is disposed near the connection end CE of the housing 11, i.e., a curve L ₁₀₁ shows a frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is disposed closer to the connection end CE than the first sound guiding hole 111 and closer to the ear canal of the user, and a curve L ₁₀₂ shows a frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is disposed near the rear side RS of the housing 11, i.e., a curve L ₁₀₂ shows a frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is disposed closer to the rear side RS than the first sound guiding hole 111 and farther from the connection end CE and further from the ear canal of the user. Comparing curve L ₁₀₁ with curve L ₁₀₂, curve L ₁₀₁ is generally higher than curve L ₁₀₂ and curve L ₁₀₁ is generally flatter over a frequency range of 8kHz-10 kHz. That IS, when the centroid of the projection of the high-frequency acoustic unit 14 on the inside face IS closer to the connection end CE than the sound guiding hole (first sound guiding hole 111) of the inside face IS, the output sound pressure level of the acoustic output device 10 at the user's ear canal IS larger, and the sound quality IS higher.

Referring to fig. 6 and 8, in some embodiments, in the short axis direction Y of the housing 11, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS above the sound guiding hole (i.e. the first sound guiding hole 111) of the inner side IS relative to the low-frequency acoustic unit 13, i.e. the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS closer to the upper side US than the centroid of the projection of the first sound guiding hole 111, so as to avoid the high-frequency acoustic unit 14 shielding the first sound guiding hole 111, resulting in a reduction of the sound output by the low-frequency acoustic unit 13 through the first sound guiding hole 111, thereby affecting the low-frequency listening volume at the ear canal of the user. In some embodiments, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS may be located directly above the first sound guiding hole 111 in the short axis direction Y, or the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS may also be located obliquely above the first sound guiding hole 111 and near the connection end CE in the short axis direction Y, or the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS may also be located obliquely above the first sound guiding hole 111 and near the rear side RS in the short axis direction Y.

In the wearing state, the free end of the housing 11 (i.e., the rear side RS of the housing 11) may extend into the concha cavity, may be orthographically projected onto the antitragus, and may be orthographically projected onto the left and right sides of the head and positioned on the anterior side of the auricle on the sagittal axis of the human body. In other words, the support structure 12 may support the housing 11 in a wearing position such as a concha cavity, an antitragus, a front side of an auricle, a rear side of an auricle, etc., so that the acoustic output device 10 may be adapted for use in a variety of different wearing manners. For the acoustic output device 10 in a partially worn mode (e.g. worn to the concha cavity or the rear side of the auricle, etc.), the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS closer to the junction (i.e. the connection end CE) of the support structure 12 and the housing 11 than the centroid of the projection of the sound guiding hole (the first sound guiding hole 111) of the low-frequency acoustic unit 13 on the inner side IS, so that the third sound guiding hole 113 IS closer to the auditory canal of the user than the first sound guiding hole 111, thereby ensuring the listening effect of high frequency.

In some different wearing manners, in order to enable the high-frequency acoustic unit 14 to be closer to the ear canal of the user than the first sound guiding hole 111, the setting position of the high-frequency acoustic unit 14 may be changed accordingly. The following describes the acoustic output device 10 shown in fig. 11 in detail. It is to be appreciated that the structure of the acoustic output device 10 of fig. 11 and its corresponding parameters may also be equally applicable to the acoustic output device 10 described above in which the housing 11 may be extended into the concha cavity without departing from the corresponding acoustic principles.

Fig. 11 is an exemplary wearing schematic of an acoustic output device according to further embodiments of the present description.

Referring to fig. 11, in some embodiments, in a worn state, at least a portion of the housing 11 may cover an anthelix region of the user, wherein the anthelix region may include any one or more of the anthelix 105, the upper foot of the anthelix, and the lower foot of the anthelix shown in fig. 1, with the housing 11 positioned over the concha cavity 102 and the ear meatus, and the ear meatus of the user in an open state. In some embodiments, the housing 11 may include a first sound guiding hole 111 and a second sound guiding hole 112, where the first sound guiding hole 111 is acoustically coupled to the front cavity of the acoustic output device 10, and the second sound guiding hole 112 is acoustically coupled to the rear cavity of the acoustic output device 10, where the sound output by the first sound guiding hole 111 and the sound output by the second sound guiding hole 112 may be approximately regarded as two point sound sources, and the two point sound sources have opposite phases, so as to form a dipole. Wherein, when the user wears the acoustic output device 10, the first sound guiding hole 111 is located on a side wall of the housing 11 facing toward or near the ear canal opening of the user, and the second sound guiding hole 112 is located on a side wall of the housing 11 facing away from or away from the ear canal opening of the user. By the arrangement, the auditory canal of the user can be completely opened, the user can hear external sound more clearly while the hearing effect of the acoustic output device 10 is ensured, and the effect of open hearing is improved. In the wearing state, the inner side IS of the shell 11 IS attached to the anthelix region, the concave-convex structure of the anthelix region can play a role of a baffle, and the sound path of the sound emitted by the second sound guide hole 112 to be transmitted to the external auditory meatus can be increased, so that the sound path difference from the first sound guide hole 111 and the second sound guide hole 112 to the external auditory meatus IS increased, destructive interference of the first sound guide hole 111 and the second sound guide hole 112 at the listening position IS reduced, and the sound intensity of the near-field listening position IS increased.

As shown in fig. 11, by positioning the housing 11 at least partially at the user's antihelix 105, the output effect of the acoustic output device 10 can be improved, i.e., the sound intensity at the near-field listening position can be increased while ensuring the far-field leakage-reduction effect. The sound emitted from the first sound guiding hole 111 is directly transmitted to the ear canal opening of the user without being blocked, and the sound emitted from the second sound guiding hole 112 needs to bypass the housing 11 or pass through the housing 11 to form an acoustic model similar to that shown in fig. 12.

FIG. 12 is a schematic diagram of an acoustic model formed from an acoustic output device according to further embodiments of the present description. As shown in fig. 12, when a baffle is provided between the point sound source a ₁ and the point sound source a ₂, in the near field, the sound field of the point sound source a ₂ needs to bypass the baffle to interfere with the sound wave of the point sound source a ₁ at the listening position, which is equivalent to increasing the sound path from the point sound source a ₂ to the listening position. Therefore, assuming that the point sound source a ₁ and the point sound source a ₂ have the same amplitude, the difference in the amplitude of the sound waves of the point sound source a ₁ and the point sound source a ₂ at the listening position increases compared to the case where no baffle is provided, so that the degree to which the two paths of sound cancel at the listening position decreases, and the volume at the listening position increases. In the far field, since the sound waves generated by the point sound source a ₁ and the point sound source a ₂ can interfere in a larger space range without bypassing the baffle plate (similar to the case without the baffle plate), compared with the case without the baffle plate, the leakage sound of the far field is not obviously increased. Therefore, by arranging the baffle structure around one of the point sound source a ₁ and the point sound source a ₂, the sound volume of the near-field listening position can be significantly improved without significantly increasing the far-field sound leakage volume.

As shown in fig. 11, the inner side IS and the lower side LS of the housing 11 are closer to the user's ear canal. In order to make the high-frequency acoustic unit 14 be disposed close to the ear canal of the user, in some embodiments, the high-frequency acoustic unit 14 may be disposed on the lower side LS of the housing 11, or disposed at a junction between the lower side LS and the inner side IS of the housing 11, so that the third sound guiding hole 113 of the high-frequency acoustic unit 14 may better point to the ear canal of the user, improve the high-frequency listening volume of the ear canal of the user, and make up for the problem of insufficient output of the acoustic output device 10 in the middle-high frequency band (for example, the frequency band greater than 8 kHz), so that the acoustic output device 10 has a better acoustic output effect in the full frequency band.

Fig. 13 is a schematic diagram of the positions of the acoustic output device and the ear according to some embodiments of the present disclosure, referring to fig. 13, N ₁ in fig. 13 is the vibration direction of the diaphragm of the high-frequency acoustic unit 14, and N ₂ is the vibration direction of the diaphragm of the low-frequency acoustic unit 13. In some embodiments, the vibration direction N ₂ of the low-frequency acoustic unit 13 is a direction toward the user's antihelix region, and the first sound guide hole 111 is provided toward the user's antihelix. At this time, the first sound guiding hole 111 and the second sound guiding hole 112 form a dipole, and the antihelix region can play a role of a baffle, so as to promote the volume of the auditory canal of the user and ensure the auditory effect of the user.

The high-frequency acoustic unit 14 outputs sound only through the third sound guiding hole 113, the high-frequency acoustic unit 14 is used as a monopole, the wavelength of the output high-frequency sound wave is short, and if the vibration direction N ₁ of the high-frequency acoustic unit 14 is set towards the antitragus region of the user, the sound output by the high-frequency acoustic unit 14 through the third sound guiding hole 113 is easily reflected by the ear, so that the high-frequency listening volume of the user is affected. In some embodiments, the vibration direction N ₁ of the high-frequency acoustic unit 14 may be a direction toward the user's ear canal, and the third sound guide hole 113 is disposed toward the user's ear canal.

In some embodiments, for the dipole formed by the first sound guiding hole 111 and the second sound guiding hole 112, in order to make the antihelix of the auricle of the user act as a baffle, the sound path difference from the first sound guiding hole 111 and the second sound guiding hole 112 to the ear canal opening of the user is increased so as to increase the low-frequency hearing volume of the ear canal opening of the user, the first sound guiding hole 111 may be designed towards the ear canal of the user, and the second sound guiding hole 112 may be designed away from the ear canal of the user or towards the antihelix. In some embodiments, the vibration direction N ₂ of the low-frequency acoustic unit 13 may be directed toward the user's antihelix region. In some embodiments, in order to make the diaphragm of the low-frequency acoustic unit 13 have a larger size and vibration space, the diaphragm of the low-frequency acoustic unit 13 may be parallel or approximately parallel to the inner side IS or the outer side OS, and the vibration direction N ₂ of the low-frequency acoustic unit 13 may be perpendicular or approximately perpendicular to the inner side IS or the outer side OS. In some embodiments, in order to ensure that the acoustic output device 10 has a good sound leakage reducing effect, and at the same time, the acoustic output device 10 has a good acoustic output effect in the full frequency band, the angle α between the vibration direction N ₁ of the high-frequency acoustic unit 14 and the vibration direction N ₂ of the low-frequency acoustic unit 13 may be in the range of 36 ° -54 °. In some embodiments, to further enhance the acoustic output effect of the acoustic output device 10 at full frequency band, to enhance the volume of the user's listening, the angle α between the vibration direction N ₁ of the high-frequency acoustic unit 14 and the vibration direction N ₂ of the low-frequency acoustic unit 13 may be in the range of 40 ° -50 °. In some embodiments, to further enhance the acoustic output effect of the acoustic output device 10 at full frequency band, the angle α between the vibration direction N ₁ of the high-frequency acoustic unit 14 and the vibration direction N ₂ of the low-frequency acoustic unit 13 may be 45 °.

The wavelength of the high-frequency sound wave output by the high-frequency acoustic unit 14 is shorter and is easy to be absorbed, and the different positions (such as embedded, flush, protruding, etc.) of the high-frequency acoustic unit 14 relative to the shell 11 can affect the loss of the high-frequency sound wave reaching the ear canal of the user, further affect the output effect of the high-frequency sound wave of the high-frequency acoustic unit 14, and further affect the volume of the hearing sound of the ear canal of the user.

In some embodiments, the projection area and the non-projection area of the high-frequency acoustic unit 14 are included on the inner side IS of the case 11, and the projection area protrudes from the non-projection area in the thickness direction Z of the case 11. In some embodiments, the projected area refers to an area covered by the projection of the high-frequency acoustic unit 14 on the inner side IS in the thickness direction Z, and the non-projected area refers to an area on the inner side IS that IS not covered by the projection of the high-frequency acoustic unit 14. The projection region protrudes from the non-projection region, which means that the high-frequency acoustic unit 14 IS at least partially protruding in the thickness direction Z with respect to the inner side IS, as shown in fig. 4, 6, and 14. By arranging the high-frequency acoustic unit 14 to be protruded relative to the inner side IS, the high-frequency acoustic unit 14 can easily approach the auditory canal of the user, so that the volume of the user can be increased.

Fig. 14 is a schematic view of the distribution of high frequency sound waves when the high frequency acoustic unit is disposed protruding from the housing according to some embodiments of the present description. As shown in fig. 14, the bottom of the high-frequency acoustic unit 14 is substantially flush with the outer surface of the housing 11, i.e., the high-frequency acoustic unit is disposed entirely protruding from the surface of the housing 11. So arranged, when a signal having a frequency of 15KHz is input, the high-frequency sound wave output by the high-frequency acoustic unit 14 approximates a spherical wave, the directivity of the high-frequency acoustic unit 14 is good, the sound pressure at the user's ear canal 101 (i.e., point C in fig. 14) is large, and the volume of the user's hearing sound is large.

Fig. 15 is a schematic diagram of the distribution of high frequency sound waves when the high frequency acoustic unit is embedded in a housing according to some embodiments of the present disclosure. As shown in fig. 15, the top of the high-frequency acoustic unit 14 is flush with the outer surface of the housing 11, i.e., the high-frequency acoustic unit is completely accommodated inside the housing 11, and the protruding height is substantially 0mm. In this way, when a signal having a frequency of 15kHz is input, the high-frequency acoustic wave output from the high-frequency acoustic unit 14 approximates a spherical wave, and the directivity of the high-frequency acoustic unit 14 is good. As can be seen by comparing fig. 14 with fig. 15, when the high-frequency acoustic unit 14 is embedded in the housing 11, the sound pressure at the ear canal 101 (i.e., point C in fig. 14, 15) of the user is relatively larger, the high-frequency sound waves are relatively more concentrated, and the listening volume of the user is relatively higher, as compared with the condition that the high-frequency acoustic unit 14 is provided protruding from the housing 11. That is, when the high-frequency acoustic unit 14 is embedded in the housing 11, the volume of the listening sound at the ear canal of the user is relatively high, and the high-frequency output effect of the acoustic output device 10 is relatively good.

Fig. 16 is a schematic view of directivity of the high-frequency acoustic unit when the high-frequency acoustic unit and the case are at different positions according to some embodiments of the present specification, and fig. 17 is a schematic view of frequency response of the high-frequency acoustic unit when the high-frequency acoustic unit and the case are at different positions according to some embodiments of the present specification. In the image of fig. 16, the frequency of the input signal of the corresponding high-frequency acoustic unit 14 is 15kHz.

Referring to fig. 16, a curve L ₁₆₁ represents a directivity distribution of the far field of the high-frequency acoustic unit 14 when the high-frequency acoustic unit 14 is disposed protruding from the housing 11, and a curve L ₁₆₂ represents a directivity distribution of the far field of the high-frequency acoustic unit 14 when the high-frequency acoustic unit 14 is embedded in the housing 11. As shown in fig. 16, the curve L ₁₆₁ is relatively round, the curve L ₁₆₂ is relatively sharp, and the directivity of the curve L ₁₆₂ is better. In the 90 ° direction, the curve L ₁₆₂ projects significantly from the curve L ₁₆₁, and in the direction relative to 90 ° the curve L ₁₆₁ projects significantly from the curve L ₁₆₂. That is, although the high-frequency acoustic unit 14 can achieve better directivity when it is provided protruding from the housing 11, when the high-frequency acoustic unit 14 is embedded in the housing 11, the far-field sound pressure level thereof is relatively smaller and the near-field sound pressure level thereof is relatively larger, so that the volume of listening sound at the ear canal of the user is relatively larger and the leakage sound in the far field is smaller.

As can be seen from fig. 16, the peaks of the curves L ₁₆₁ and L ₁₆₂ are both in the 90 ° direction. For the curve L ₁₆₁ and the curve L ₁₆₂, the peak positions of the curve L ₁₆₁ and the curve L ₁₆₂ are used as references, the peak positions of the curve L ₁₆₁ and the curve L ₁₆₂ are reduced by 3dB, two points can be obtained on the curve L ₁₆₁, two points can be obtained on the curve L ₁₆₂, and the angle range between the two corresponding points on the curve is the-3 dB beam width of the corresponding curve. In some embodiments, the-3 dB beamwidth of curve L ₁₆₁ is 141 and the-3 dB beamwidth of curve L ₁₆₂ is 101. Compared to curve L ₁₆₁, the-3 dB beam width of curve L ₁₆₂ is smaller and the directivity of curve L ₁₆₂ is better.

Referring to fig. 17, a curve L ₁₇₁ represents a frequency response curve of the high-frequency acoustic unit 14 when the high-frequency acoustic unit 14 is disposed protruding from the housing 11, and a curve L ₁₇₂ represents a frequency response curve of the high-frequency acoustic unit 14 when the high-frequency acoustic unit 14 is embedded in the housing 11. As shown in fig. 17, in the frequency range of high frequency (for example, 8kHz or more), the position of the curve L ₁₇₂ is about 2dB higher than that of the curve L ₁₇₁. That is, in the frequency range of the high frequency (for example, 8kHz or more), the output sound pressure level when the high frequency acoustic unit 14 is embedded in the housing 11 is improved by about 2dB as compared with the case where the high frequency acoustic unit 14 is provided protruding from the housing 11.

In summary, compared with the arrangement that the high-frequency acoustic unit 14 protrudes out of the housing 11, when the high-frequency acoustic unit 14 is embedded in the housing 11, the high-frequency output effect of the high-frequency acoustic unit 14 is better, and the listening volume of the user is higher. However, when the high-frequency acoustic unit 14 is completely embedded in the case 11, reflection of the high-frequency acoustic wave is small, but loss is large for the high-frequency acoustic wave, and the propagation distance of the high-frequency acoustic wave is affected to some extent.

In some embodiments, in order to reduce the loss of high-frequency sound waves while enhancing the acoustic output performance of the acoustic output device 10 at high frequencies, the projected area and the non-projected area are flush (i.e., the difference in height between the projected area and the non-projected area in the thickness direction Z of the housing 11 is 0 mm). Because of possible tooling installation errors, the projected area and the non-projected area may not be absolutely flush, and in some embodiments, the projected area and the non-projected area may be considered approximately flush when the difference in height in the thickness direction Z of the housing 11 is less than 0.6 mm.

In some embodiments, to enhance the acoustic output performance of the acoustic output device 10 at high frequencies, enhancing the volume of the user's listening, the ratio of the difference in height of the projected area and the non-projected area in the thickness direction Z of the housing 11 to the thickness of the housing 11 may be less than 0.6. In some embodiments, to further enhance the acoustic output performance of the acoustic output device 10 at high frequencies, the ratio of the height difference of the projected area and the non-projected area in the thickness direction Z of the housing 11 to the thickness of the housing 11 may be 0-0.3. In some embodiments, to further enhance the volume of the user's listening, the ratio of the difference in height of the projected area and the non-projected area in the thickness direction Z of the housing 11 to the thickness of the housing 11 may be 0-0.1.

In fig. 14 to 17, the analysis of the output performance of the acoustic output device 10 when the high-frequency acoustic unit 14 is protruded/embedded in the case 11 was performed based on the auricle model of the "standard" shape and size as a reference. In practical applications, because ear types (e.g., shapes and sizes) of different users are different, the acoustic output device 10 is also different in position state when worn, and the distance from the sound guiding hole of the high-frequency acoustic unit 14 to the ear canal of the user is different in wearing state, at this time, the output performance of the acoustic output device 10 may also be changed when the corresponding high-frequency acoustic unit 14 protrudes/is embedded in the housing 11. If the ear size of the user is large, the high-frequency output effect of the acoustic output device 10 will be affected due to the path loss of the high-frequency sound wave when the sound guide hole corresponding to the high-frequency acoustic unit 14 is far from the ear canal of the user in the wearing state. When the high-frequency acoustic unit 14 protrudes out of the shell 11, the distance between the corresponding sound guiding hole of the high-frequency acoustic unit 14 and the user's ear canal is short, and when the high-frequency acoustic unit 14 is embedded in the shell 11, the distance between the corresponding sound guiding hole of the high-frequency acoustic unit 14 and the user's ear canal is long. The design of the high frequency acoustic unit 14 embedded in the housing 11 (e.g. flush with the housing 11) is therefore relatively more suitable for users with smaller ear sizes, which experience relatively poor use experience. The design that the high-frequency acoustic unit 14 protrudes out of the shell 11 can effectively reduce the distance between the high-frequency acoustic unit 14 and the auditory canal of the user corresponding to the sound guide hole, so that users with different ears can obtain better auditory effects.

In some embodiments, to ensure that the acoustic output device 10 can adapt to more users 'ear patterns, so that the acoustic output device 10 can have a smaller distance from the user's ear canal corresponding to the high-frequency acoustic unit 14 in the wearing state, so as to ensure the acoustic output effect, the high-frequency acoustic unit 14 may be protruded out of the casing 11. In some embodiments, the degree of protrusion of the high-frequency acoustic unit 14 from the inner side IS may be represented by the difference in height of the projected area from the non-projected area in the thickness direction Z. In some embodiments, when the difference in height between the projected area and the non-projected area in the thickness direction Z is not less than 0.6mm, it may be determined that the high-frequency acoustic unit 14 protrudes from the housing 11. That is, when the distance between the top of the high-frequency acoustic unit 14 and the outer surface of the case 11 in the thickness direction Z is not less than 0.6mm, it can be determined that the high-frequency acoustic unit 14 protrudes from the case 11. In some embodiments, the difference in height between the projected area and the non-projected area in the thickness direction Z of the housing 11 is not greater than 4mm, so as to avoid the high-frequency acoustic unit 14 protruding too far from the housing 11, which would affect wearing of the acoustic output device 10, so that the sound guiding holes (e.g., the first sound guiding holes 111, etc.) and the ear structures of the user may interfere, which would affect the listening effect. That is, when the high-frequency acoustic unit 14 protrudes from the housing 11, the height difference between the projection area and the non-projection area in the thickness direction Z may be 0.6mm to 4mm. When the high-frequency acoustic unit 14 is projected from the housing 11, the projection degree of the projection area is higher than that of the non-projection area, the high-frequency acoustic unit 14 is easier to approach the auditory canal of the user, and accordingly the auditory volume of the user is increased. In some embodiments, when the high-frequency acoustic unit 14 protrudes from the housing 11, in order to further increase the volume of the user, the height difference between the projection area and the non-projection area in the thickness direction Z of the housing 11 may be 1.5mm-3mm. In some embodiments, when the high frequency acoustic unit 14 protrudes from the housing 11, the height difference between the projected area and the non-projected area may be 2mm-2.5mm in order to further ensure wearing of the acoustic output device 10 and to ensure listening.

In some embodiments, the degree of projection of the high-frequency acoustic unit 14 against the inner side IS may also be expressed by the ratio of the difference in height of the projected area and the non-projected area in the thickness direction Z to the thickness dimension of the housing 11 in the thickness direction Z. In some embodiments, when the high-frequency acoustic unit 14 protrudes from the casing 11, in order to make the acoustic output device 10 have a good acoustic output effect at a high frequency while ensuring the volume of the user's listening, the ratio of the height difference between the projected area and the non-projected area to the thickness dimension of the casing 11 in the thickness direction Z of the casing 11 is greater than 0.05. In some embodiments, when the high-frequency acoustic unit 14 is projected from the housing 11, in order to further secure wearing of the acoustic output device 10, a listening effect is secured, and a ratio of a height difference of the projected area and the non-projected area to a thickness dimension of the housing 11 in a thickness direction Z of the housing 11 may be 0.06-0.12. In some embodiments, when the high-frequency acoustic unit 14 protrudes from the housing 11, the ratio of the height difference between the projected area and the non-projected area to the thickness dimension of the housing 11 may be 0.08-0.09 in order to further enhance the listening volume of the user.

In some embodiments, the high frequency acoustic unit 14 may also employ a moving iron transducer to enhance the acoustic output performance of the acoustic output device 10.

Fig. 18A-18D are schematic diagrams of the high-frequency acoustic units shown in some embodiments of the present disclosure being disposed in housings corresponding to different positions, fig. 19A is a schematic diagram of frequency response curves of the acoustic output devices corresponding to different positions of the high-frequency acoustic units shown in some embodiments of the present disclosure, and fig. 19B is an enlarged schematic diagram of the medium-high frequency curves of fig. 19A.

In some embodiments, the high-frequency acoustic unit 14 may be provided at one end of the housing 11 in the short axis direction Y. In some embodiments, the high frequency acoustic unit 14 may be disposed outside of the housing 11, such as the upper side US, the lower side LS, etc., as shown in FIG. 18A. In some embodiments, the high frequency acoustic unit 14 may be disposed inside the corresponding side wall (e.g., upper side US, lower side LS, etc.) of the housing 11. The corresponding sound guiding holes (e.g., third sound guiding holes 113) of the high-frequency acoustic unit 14 may be disposed directly toward the inner side IS.

In some embodiments, the high-frequency acoustic unit 14 may be provided at one end of the housing 11 in the long axis direction X. In some embodiments, the high frequency acoustic unit 14 may be disposed outside the housing 11. At this time, since one end of the housing 11 in the long axis direction X is the connection end CE to which the support structure 12 is connected, the high-frequency acoustic unit 14 may be provided at the rear side RS of the housing 11, as shown in fig. 18B. In some embodiments, the high-frequency acoustic unit 14 may be disposed inside the corresponding side wall (e.g., the connection end CE, the rear side RS, etc.) of the housing 11. The corresponding sound guiding holes (e.g., third sound guiding holes 113) of the high-frequency acoustic unit 14 may be disposed directly toward the inner side IS.

In some embodiments, the high-frequency acoustic unit 14 may be disposed below the low-frequency acoustic unit 13 in the thickness direction Z. That is, in the thickness direction Z, the high-frequency acoustic unit 14 is closer to the outer side face OS than the low-frequency acoustic unit 13. In some embodiments, the high-frequency acoustic unit 14 may be disposed inside the housing 11, since the outer side OS of the housing 11 may be provided with control keys, touch areas, and the like. Since the inner side IS of the housing 11 IS close to the ear canal of the user and the low frequency acoustic unit 13 IS provided between the high frequency acoustic unit 14 and the inner side IS, in order to make the sound of the high frequency acoustic unit 14 be output toward the ear canal of the user, an acoustic duct may be further provided in the housing 11, one end of which IS acoustically coupled to one side of the diaphragm of the high frequency acoustic unit 14 and the other end of which IS provided toward the inner side IS, as shown in fig. 18C.

In some embodiments, the high-frequency acoustic unit 14 may be disposed above the low-frequency acoustic unit 13 in the thickness direction Z. That IS, in the thickness direction Z, the high-frequency acoustic unit 14 IS closer to the inner side IS than the low-frequency acoustic unit 13. In some embodiments, the high-frequency acoustic unit 14 may be disposed outside the housing 11, i.e., the high-frequency acoustic unit 14 may be disposed on the inner side IS, as shown in fig. 18D. In some embodiments, the high-frequency acoustic unit 14 may be disposed inside the corresponding side wall (i.e., the inner side IS) of the housing 11. The orientation of the corresponding sound guiding holes (e.g., the third sound guiding holes 113) of the high-frequency acoustic unit 14 may be the same as the orientation of the first sound guiding holes 111.

In some embodiments, when the acoustic output device 10 is in the wearing mode shown in fig. 8, the rear side RS of the housing 11 extends into the concha cavity, and the frequency response curves of the acoustic output device 10 corresponding to the high-frequency acoustic units 14 at different setting positions are shown in fig. 19A and 19B. Referring to fig. 19A and 19B, a curve L ₁₉₁ is a frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 is operated alone, a curve L ₁₉₂ is a frequency response curve of the acoustic output device when the high-frequency acoustic unit 14 is operated alone, a curve L ₁₉₃ is a frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are operated simultaneously corresponding to fig. 18A, a curve L ₁₉₄ is a frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are operated simultaneously corresponding to fig. 18B, a curve L ₁₉₅ is a frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are operated simultaneously corresponding to fig. 18C, and a curve L ₁₉₆ is a frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are operated simultaneously corresponding to fig. 18D. As shown in fig. 19A and 19B, the sensitivity of the curves L ₁₉₃, L ₁₉₄, L ₁₉₅, and L ₁₉₆ provided with the high-frequency acoustic unit 14 is improved at high frequencies (for example, 8kHz or more) compared to the curve L ₁₉₁ provided with no high-frequency acoustic unit 14. That is, the arrangement of the high-frequency acoustic unit 14 can effectively enhance the acoustic output effect of the acoustic output device 10 in the high-frequency range. The overall sensitivity of the curve L ₁₉₆ is greatest compared to the curves L ₁₉₃, L ₁₉₄ and L ₁₉₅. That IS, in the four setting positions shown in fig. 18A to 18D, the structure in which the high-frequency acoustic unit 14 shown in fig. 18D IS provided on the inner side IS can better enhance the acoustic output effect of the acoustic output device 10.

Some embodiments of the present disclosure also provide another acoustic output device that includes a low frequency acoustic unit, a high frequency acoustic unit, a housing, and a support structure. The structures of the low-frequency acoustic unit, the high-frequency acoustic unit, the housing and the supporting structure of the acoustic output device and the structures of the low-frequency acoustic unit 13, the high-frequency acoustic unit 14, the housing 11 and the supporting structure 12 of the acoustic output device 10 are similar or identical. The difference between the acoustic output device and the acoustic output device 10 is that, among at least two sound guiding holes provided on the casing 11, the at least two sound guiding holes may include a first sound guiding hole corresponding to the low-frequency acoustic unit, a second sound guiding hole corresponding to the low-frequency acoustic unit, and a third sound guiding hole corresponding to the high-frequency acoustic unit (for example, a fourth sound guiding hole), where the third sound guiding hole and the fourth sound guiding hole are respectively provided at two sides of the diaphragm of the high-frequency acoustic unit, the high-frequency acoustic unit may radiate sound through the third sound guiding hole and the fourth sound guiding hole, and the third sound guiding hole and the fourth sound guiding hole also form a dipole, so that far-field leakage sound of the acoustic output device is enhanced, and output effect of the acoustic output device is improved. For further details of the acoustic output device, reference may be made to the foregoing description of the acoustic output device 10, which is not repeated here.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.

Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure does not imply that the subject application requires more features than are set forth in the claims. Indeed, less than all of the features of a single embodiment disclosed above.

In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments of the present application. Other variations are also possible within the scope of the application. Thus, by way of example, and not limitation, alternative configurations of embodiments of the application may be considered in keeping with the teachings of the application. Accordingly, the embodiments of the present application are not limited to the embodiments explicitly described and depicted herein.

Claims

1. An acoustic output device, comprising:

A low frequency acoustic unit;

A high-frequency acoustic unit;

A housing configured to carry at least the low frequency acoustic unit and the high frequency acoustic unit, and

A support structure configured to wear the housing in a position adjacent to the ear canal but not occluding the ear canal orifice;

wherein the shell is provided with at least two sound guide holes, a first sound guide hole and a second sound guide hole in the at least two sound guide holes are respectively and acoustically coupled with two sides of the vibrating diaphragm of the low-frequency acoustic unit, the low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guide hole and the second sound guide hole;

one sound guide hole of the at least two sound guide holes is acoustically coupled with one side of the vibrating diaphragm of the high-frequency acoustic unit, the high-frequency acoustic unit radiates sound to the outside of the shell through the one sound guide hole, and when the high-frequency acoustic unit is in a wearing state, the sound guide hole corresponding to the high-frequency acoustic unit faces towards the auditory canal of a user.

2. The acoustic output device of claim 1, wherein the one sound guide aperture is a third sound guide aperture;

The low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guide hole and the second sound guide hole;

The high-frequency acoustic unit radiates sound to the outside of the housing through the third sound guide hole;

the first sound guide hole, the second sound guide hole and the third sound guide hole are respectively arranged at different positions of the shell.

3. The acoustic output device of claim 2 wherein the third sound guide aperture is closer to the user's ear canal than the first and second sound guide apertures, the housing including an inner side opposite the front outer side of the user's ear when worn, the first and third sound guide apertures each being located on the inner side.

4. The acoustic output device of claim 1, wherein the housing includes an inner side opposite a front outer side of the user's ear when worn, the one sound guiding aperture being the first sound guiding aperture, the first sound guiding aperture being acoustically coupled to a diaphragm side of the low frequency acoustic unit and a diaphragm side of the high frequency acoustic unit, the first sound guiding aperture being located on the inner side, the low frequency acoustic unit and the high frequency acoustic unit radiating sound through the first sound guiding aperture to the user's ear canal.

5. The acoustic output device of claim 3 or 4, wherein a ratio of a projected area of the high frequency acoustic unit on an inner side surface of the housing to a projected area of the low frequency acoustic unit on the inner side surface of the first sound guiding hole is not more than 10%.

6. The acoustic output device of claim 3 or 4, wherein a centroid of a projection of the high frequency acoustic unit at an interior side of the housing is closer to a junction of the support structure and the housing than a centroid of a projection of the low frequency acoustic unit at the first sound guiding aperture of the interior side.

7. The acoustic output device of claim 5, wherein in a worn state, an end of the housing remote from the junction protrudes into the user's concha cavity;

The housing includes a short axis direction and a long axis direction, in the short axis direction of the housing, a centroid of the high-frequency acoustic unit projected on the inner side surface is closer to an upper side surface of the housing than a centroid of the low-frequency acoustic unit projected on the first sound guiding hole of the inner side surface.

8. The acoustic output device of claim 3 or 4, wherein the high frequency acoustic unit is located at the underside of the housing or at the junction of the underside and the inside of the housing;

In the worn state, the housing at least partially covers an antihelix region of the user.

9. The acoustic output device of claim 8, wherein the angle between the direction of vibration of the high frequency acoustic unit and the direction of vibration of the low frequency acoustic unit is in the range of 36 ° -54 °.

10. The acoustic output device according to claim 3 or 4, wherein a projected area of the high-frequency acoustic unit and a non-projected area are included on an inner side surface of the case, the projected area protruding from the non-projected area in a thickness direction of the case.

11. The acoustic output device according to claim 10, wherein a height difference between the projected area and the non-projected area is not less than 0.6mm in a thickness direction of the housing, or a ratio of the height difference between the projected area and the non-projected area to the thickness of the housing is more than 0.05.

12. The acoustic output device of claim 3 or 4, wherein the housing comprises a projected area and a non-projected area of the high frequency acoustic unit on an inner side of the housing, the projected area and the non-projected area being flush.

13. The acoustic output device according to claim 3 or 4, wherein a projected area and a non-projected area of the high-frequency acoustic unit are included on an inner side surface of the housing, and a ratio of a height difference between the projected area and the non-projected area in a thickness direction of the housing to a thickness of the housing is less than 0.3.

14. The acoustic output device according to claim 1, wherein the minimum resonance frequency corresponding to the high-frequency acoustic unit is not lower than 5kHz, and the minimum resonance frequency corresponding to the low-frequency unit is not higher than 1kHz.

15. An acoustic output device, comprising:

A low frequency acoustic unit;

A high-frequency acoustic unit;

the low-frequency acoustic unit and the high-frequency acoustic unit radiate sound to the outside of the shell through one or more sound guide holes of the at least two sound guide holes respectively;

the shell comprises an inner side surface which is opposite to the front outer side surface of the ear of the user when the shell is worn, one of the at least two sound guide holes is positioned on the inner side surface and is in acoustic communication with the low-frequency acoustic unit, and when the shell is in a wearing state, the sound guide hole corresponding to the high-frequency acoustic unit faces the ear canal of the user;

The overlapping ratio of the projection area of the high-frequency acoustic unit on the inner side surface of the shell and the projection area of the sound guide hole of the low-frequency acoustic unit on the inner side surface is not more than 10%.