CN111464680A - Electronic equipment - Google Patents

Abstract

An embodiment of the present application provides an electronic device, including a casing, wherein a sound outlet and a accommodating cavity are arranged in the casing; and a receiver, the receiver is disposed in the accommodating cavity, and divides the accommodating cavity into a first A cavity and a second cavity, the first cavity, the second cavity and the sound outlet are communicated with each other; wherein, when the receiver vibrates, a first sound wave signal is generated in the first cavity , and generate a second acoustic wave signal in the second cavity, the second acoustic wave signal and the first acoustic wave signal at least partially cancel. Since the first cavity, the second cavity and the sound outlet are connected to each other, the second acoustic wave signal generated in the second cavity by the receiver and the first acoustic wave signal generated in the first cavity can be at least partially cancelled, so that the The sound emitted from the sound outlet is reduced, so as to avoid the leakage of the user's voice information during the call, and improve the user's good experience.

Description

Electronic equipment

technical field

The present application relates to the field of electronic technology, and in particular, to an electronic device.

Background technique

Mobile phones have become an indispensable part of people's lives. At present, mobile phones have many functions, and the call function is one of the basic functions of mobile phones.

With the popularity of the full screen of mobile phones, the position of the handset of the mobile phone is getting smaller and smaller from the top of the screen of the mobile phone. As a result, when the user is making a call, the voice information received by the handset is leaked, and the voice information received by the handset can be heard clearly at a long distance. The content of the call to the user seriously affects the privacy of the user's call.

SUMMARY OF THE INVENTION

The embodiment of the present application provides an electronic device, which can prevent the user's voice information from leaking during a call, and improve the user's good experience.

The embodiment of the present application provides an electronic device, including:

a housing, the housing is provided with a sound outlet and a accommodating cavity; and

A receiver, the receiver is arranged in the accommodating cavity, and divides the accommodating cavity into a first cavity and a second cavity, and the first cavity, the second cavity and the sound outlet are mutually connected;

Wherein, when the receiver vibrates, a first sound wave signal is generated in the first cavity, and a second sound wave signal is generated in the second cavity, and the second sound wave signal and the first sound wave signal are at least partially offset.

In the electronic device according to the embodiment of the present application, by disposing the receiver in the accommodating cavity of the casing, the accommodating cavity is divided into a first cavity and a second cavity, so that the first cavity, the second cavity and the sound outlet are connected to each other. , the second sound wave signal generated by the receiver in the second cavity and the first sound wave signal generated in the first cavity can be at least partially offset, so that the sound emitted from the sound hole can be reduced, and the user can be prevented from talking during the call. The voice information in the leak is leaked to improve the user's good experience.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic diagram of a first structure of an electronic device provided by an embodiment of the present application.

FIG. 2 is a schematic view of the structure along the P1-P2 direction in FIG. 1 .

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2 .

FIG. 4 is a schematic diagram of a second structure of an electronic device provided by an embodiment of the present application.

FIG. 5 is a schematic view of the structure along the P3-P4 direction in FIG. 4 .

FIG. 6 is an enlarged schematic view of the structure at B in FIG. 5 .

FIG. 7 is a schematic diagram of a third structure of an electronic device provided by an embodiment of the present application.

FIG. 8 is a schematic view of the structure along the direction P5-P6 in FIG. 7 .

FIG. 9 is an enlarged schematic view of the structure at C in FIG. 8 .

FIG. 10 is a schematic diagram of a fourth structure of an electronic device provided by an embodiment of the present application.

FIG. 11 is a schematic diagram of the structure along the direction P7-P8 in FIG. 10 .

FIG. 12 is an enlarged schematic view of the structure at D in FIG. 11 .

FIG. 13 is a schematic diagram of a fifth structure of an electronic device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

The electronic device may be, but is not limited to, electronic devices such as mobile phones, tablets, and computers. The electronic device in the embodiment of the present application is described by taking a mobile phone as an example.

Please refer to FIG. 1 and FIG. 2 , FIG. 1 is a schematic structural diagram of the first type of electronic device provided by an embodiment of the present application, FIG. 2 is a schematic structural diagram of FIG. 1 along the direction P1-P2, and FIG. 3 is an enlarged view of the position A in FIG. 2 Schematic. The electronic device includes a casing 10 and a receiver 20 , and the receiver 20 is arranged in the casing 10 .

The housing 10 is the outer shell of the electronic device 100 , and the housing 10 may be composed of a middle frame, a back cover, and a front cover of the electronic device 100 , and the accommodating cavity 12 may be provided in the middle frame of the electronic device 100 .

The receiver 20 is the basic component for realizing the call function. The receiver 20 includes an electric coil and a diaphragm fixed on the electric coil. During operation, the electric coil will drive the diaphragm to vibrate when it is subjected to the Loren magnetic force in the magnetic field, and the diaphragm vibrates. It pushes the air to vibrate, which in turn produces sound.

When the receiver 20 vibrates, it generally vibrates back and forth, and the receiver 20 will generate two sound wave signals in opposite directions during the front and rear vibration process, such as a first sound wave signal and a second sound wave signal, and the two opposite sound wave signals will partially cancel when they meet. , so that the sound produced by the receiver 20 can be attenuated.

As shown in FIG. 3 , the housing 10 is provided with a sound outlet 11 and an accommodating cavity 12 , the receiver 20 is located in the accommodating cavity 12 , and the accommodating cavity 12 is separated into a first cavity 121 and a second cavity 122 . The cavity 121, the second cavity 122 and the sound outlet 11 communicate with each other, wherein the receiver 20 will generate a first sound wave signal in the first cavity and a second sound wave signal in the second cavity when vibrating, so The second sound wave signal and the first sound wave signal are at least partially canceled. Since the first cavity 121 , the second cavity 122 and the sound outlet 11 are connected to each other, the first sound wave signal is transmitted to the The sound hole 11, the second sound wave signal is transmitted to the sound hole 11 through the second cavity 122, and the second sound wave signal and the first sound wave signal will be merged at the sound hole 11, so that the receiver 20 can be placed in the second cavity. The second sound wave signal generated by the body 122 and the first sound wave signal generated in the first cavity 121 are at least partially offset, so that the sound emitted from the sound hole 11 can be reduced, thereby avoiding the leakage of the user's voice information during the call. , to improve the user's good experience.

The accommodating cavity 12 may be set in a square shape, and the accommodating cavity 12 may also be set in an oval or irregular shape, and the embodiment of the present application does not limit the shape of the accommodating cavity 12 .

The first cavity 121 can be a front cavity, the front cavity is the side where the diaphragm of the receiver 20 is located, the second cavity 122 can be a back cavity, and the rear cavity can be understood as the side where the back of the diaphragm of the receiver 20 is located.

The shapes of the first cavity 121 and the second cavity 122 may be square. It is understandable that the shapes of the first cavity 121 and the second cavity 122 may also be circular or oval. The shapes of the cavity 121 and the second cavity 122 are defined.

The shape and size of the first cavity 121 and the second cavity 122 may be the same, and it can be understood that the shape and size of the first cavity 121 and the second cavity 122 may be different.

Please refer to FIG. 3 again, the housing 10 is further provided with a first sound outlet channel 13 and a second sound outlet channel 14 , and the first cavity 121 communicates with the sound outlet hole 11 through the first sound outlet channel 13 , for example, the first cavity The body 121 communicates with one end of the first sound outlet channel 13 , and the other end of the first sound outlet channel 13 communicates with the sound outlet hole 11 .

The second sound outlet channel 14 may be located below the first cavity 121 and the second cavity 122 , that is, the second sound outlet channel 14 is located at one end of the first cavity 121 and the second cavity 122 away from the sound outlet hole 11 , the second cavity 122 communicates with the first cavity 121 through the second sound outlet channel 14 , so that the first cavity 121 , the second cavity 122 and the sound outlet 11 can communicate with each other.

Since the second cavity 122 is in communication with the end of the first cavity 121 away from the sound outlet 11 , the second acoustic wave signal generated by the receiver 12 in the second cavity 122 can be connected to the first sound wave generated by the receiver 12 in the first cavity 121 . The sound wave signal is partially canceled, so that the sound emitted from the sound outlet 11 can be better reduced, thereby avoiding the leakage of the user's voice information during the call, and improving the user's good experience.

Wherein, the shape of the first sound outlet channel 13 and the second sound outlet channel 14 may be straight or arc, for example, the shape of the first sound outlet channel 13 is a straight bar, and the second sound outlet channel 14 is in the shape of an arc.

It should be noted that, in the description of this application, the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more of said features.

It can be understood that please refer to FIG. 4 , FIG. 5 and FIG. 6 , and FIG. 4 is a schematic diagram of a second structure of the electronic device provided by the embodiment of the present application. FIG. 5 is a schematic view of the structure along the P3-P4 direction in FIG. 4 . FIG. 6 is an enlarged schematic view of the structure at B in FIG. 5 . The electronic device 100 further includes a mounting member 30 , the mounting member 30 is disposed in the housing 10 , the mounting member 30 is located at the end of the accommodating cavity 12 , and the mounting member 30 is used for mounting the receiver 20 . The receiver 20 is installed in the accommodating cavity 12 through the mounting member 30 , which not only facilitates the fixing of the receiver 20 , but also facilitates the disassembly and replacement of the receiver 20 .

The receiver 20 is connected to the mounting member 30 by screws, and the mounting member 30 is fixed by clamping with the side wall of the accommodating cavity 12 . The block and the groove cooperate with each other, so as to realize the clamping and fixing of the mounting member 30 and the side wall of the accommodating cavity 12 .

It should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; It may be a mechanical connection, and those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

It can be understood that the receiver 20 can also be bonded to the mounting member 30 by double-sided tape, and the mounting member 30 can also be fixed to the side wall of the accommodating cavity 12 by screws. The fixing methods of the receiver 20 and the mounting member 30 , and the mounting member 30 and the side wall of the accommodating cavity 12 are not limited to the above examples. All are within the protection scope of the embodiments of the present application.

The mounting member 30 may be located at one end of the accommodating cavity 12 close to the sound outlet hole 11 . It is understood that the mounting member 30 may also be located at the end of the accommodating cavity 12 away from the sound outlet hole 11 .

Two mounting pieces 30 may be provided, and the two mounting pieces 30 are located at both ends of the accommodating cavity 12 , so that the receiver 20 can be better mounted.

Wherein, the second sound outlet channel 122 is disposed in the mounting member 30, so that the second cavity 122 communicates with the first cavity 121 through the second sound outlet channel 122, so that the first cavity 121 and the second cavity can be connected. 122 and the sound outlet 11 communicate with each other.

When there are two mounting members 30 , a second sound outlet channel 14 is respectively provided in the two mounting members 30 , so that the second cavity 122 can communicate with the first cavity 121 through the two second sound outlet channels 14 . In order to realize the rapid fusion of the second acoustic wave signal generated in the second cavity 122 and the first acoustic wave signal generated in the first cavity 121, so that the second acoustic wave signal in the second cavity 122 and the first cavity Part of the first sound wave signal in 121 is quickly canceled, so that the sound at the sound hole 11 can be effectively reduced, thereby better avoiding the leakage of the user's voice information during the call, and improving the user's good experience.

The mounting member 30 can be made of metal materials, such as metal copper, metal aluminum, etc., and the mounting member 30 can also be made of non-metallic materials, such as silica gel, plastic, and the like.

It can be understood that the second sound outlet channel 14 may also be communicated with the first sound outlet channel 14 to realize the mutual communication between the first cavity 121 , the second cavity 122 and the sound outlet hole 11 . Wherein, the second sound output channel 14 may intersect with or be parallel to the first sound output channel.

When the second sound output channel 14 intersects with the first sound output channel 13 , please refer to FIGS. 7 , 8 and 9 . FIG. 7 is a schematic diagram of a third structure of the electronic device provided by the embodiment of the present application. FIG. 8 is a schematic view of the structure along the direction P5-P6 in FIG. 7 . FIG. 9 is an enlarged schematic view of the structure at C in FIG. 8 . The first sound outlet channel 13 is located between the sound outlet hole 11 and the first cavity 121 , and the first cavity 121 communicates with the sound outlet hole 11 through the first sound outlet channel 13 , for example, one end of the first sound outlet channel 13 It is communicated with the first cavity 121, the other end of the first sound outlet 13 is communicated with the sound hole 11, one end of the second sound outlet 13 is communicated with the second cavity 122, and the other end of the second sound outlet 14 is communicated with the second cavity 122. The first sound outlet channel 13 communicates with each other, so that the first cavity 121 and the second cavity 122 are communicated with each other. Since the second cavity 122 communicates with the first cavity 121 through the second sound outlet channel 14 , the second acoustic wave signal generated by the receiver 20 in the second cavity 121 can be communicated with the first acoustic signal generated in the first cavity 121 . The sound wave signal is partially canceled at the first sound outlet channel 13 and the sound outlet hole 11 to reduce the sound at the sound outlet hole 11 , thereby better avoiding the leakage of the user's voice information during the call.

Wherein, the end of the second sound outlet channel 14 away from the second cavity 122 may be communicated with the middle of the first sound outlet channel 13. It is understood that the end of the second sound outlet channel 14 away from the second cavity 122 may also be connected with the first sound outlet channel 13 When one third of the sound outlet channel 13 is connected, the contact time between the second cavity 122 and the sound wave in the first cavity 122 can be increased, the sound at the sound outlet 11 can be better reduced, and the sound at the sound outlet 11 can be better reduced. Avoid leakage of voice information of users during a call.

The second sound output channel 14 and the first sound output channel 13 intersect, that is, the second sound output channel 14 and the first sound output channel 13 may have an included angle, and the included angle may be greater than 0 degrees and less than 180 degrees (excluding 0 degrees and 180 degrees) For example, when the second sound output channel 14 is set to be arc-shaped, the included angle between the second sound output channel 14 and the first sound output channel 13 may be an acute angle, such as 60 degrees or 45 degrees. When the second sound outlet channel 14 is set to be L-shaped, the included angle between the second sound outlet channel 14 and the first sound outlet channel 13 is a right angle, that is, the second sound outlet channel 14 and the first sound outlet channel 13 perpendicular to each other.

When the second sound output channel 14 is parallel to the first sound output channel 13 , please refer to FIGS. 10 , 11 and 12 . FIG. 10 is a third structural schematic diagram of the electronic device provided by the embodiment of the present application. FIG. 11 is a schematic diagram of the structure along the direction P7-P8 in FIG. 10 . FIG. 12 is an enlarged schematic view of the structure at D in FIG. 11 . The first sound outlet channel 13 is located between the sound outlet hole 11 and the first cavity 121 , and the first cavity 121 communicates with the sound outlet hole 11 through the first sound outlet channel 13 , for example, one end of the first sound outlet channel 13 It communicates with the first cavity 121, the other end of the first sound outlet 13 communicates with the sound outlet 11, the second sound outlet 14 is located between the sound outlet 11 and the second cavity 122, and the second sound outlet 14 One end communicates with the second cavity 122 , and the other end of the second sound outlet channel 14 communicates with the sound outlet 11 , so that the first cavity 121 and the second cavity 122 and the sound outlet 11 communicate with each other. Since the second cavity 122 is directly communicated with the sound outlet 11 through the second sound outlet channel 14 , the second sound wave signal generated by the receiver 20 in the second cavity 121 can be directly transmitted to the sound outlet through the second sound outlet channel 14 11, since the second cavity 122 and the second sound channel 14 are located on the side away from the display screen, and the first cavity 121 and the first sound channel 13 are located on the side close to the display screen, the second cavity 122 The second sound wave signal transmitted along the sound hole 11 toward the side close to the display screen, when passing through the first sound outlet channel 13, partially offsets the first sound wave signal transmitted from the first cavity 121 to the sound hole 11, The sound at the exit of the sound outlet 11 can be reduced, thereby reducing the leakage of voice information of the user during the call.

Since the first sound outlet channel 13 and the second sound outlet channel 14 are both directly connected to the sound outlet hole 11, the second sound outlet channel 14 and the first sound outlet channel 13 do not intersect, that is, the second sound outlet channel 14 and the first sound outlet channel 13 are parallel to each other.

It can be understood that the second cavity 122 can also be communicated with the sound outlet 11 through the second sound outlet channel 14 , the first cavity 121 can also be communicated with the second cavity 122 through the first sound outlet channel 13 , or, the first The second cavity 122 may also communicate with the sound outlet 11 through the second sound outlet channel 14 , and the first cavity 121 may also communicate with the first sound outlet channel 13 through the first sound outlet channel 13 . After the sound waves in the second cavity 122 and the sound waves in the first cavity 121 are cancelled, the sound waves in the first cavity 121 are transmitted to the sound outlet 11 through the second sound outlet channel 14 , which can also reduce the number of users during the call. voice information leaked.

It can be understood that, in order to better reduce the sound leakage of the user during the call, the electronic device 100 further includes a sealing member (not shown), the sealing member is disposed in the second cavity 122 , and the sealing member surrounds the diaphragm of the receiver 20 . The arrangement on the back and the arrangement of the seal can, on the one hand, protect the receiver 20 well and prevent the receiver 20 from being damaged; , so that it can more offset with the first sound wave signal generated in the first cavity 121 , thereby reducing the leakage of voice information of the user during the call.

The sealing member can be made of foam, silica gel or other materials, the sealing member can be bonded to the receiver through double-sided tape, and the sealing member can also be connected to the receiver in other ways. The embodiment of the present application does not limit the connection method between the sealing member and the receiver. .

Please refer to FIG. 13 . FIG. 13 is a schematic diagram of a fifth structure of an electronic device provided by an embodiment of the present application. The electronic device 100 further includes a display screen 40 , a middle frame 50 , a back cover 60 , a circuit board 70 and a battery 80 .

The display screen 40 is disposed on the middle frame 50 to form a display surface of the electronic device 100 for displaying information such as images and texts. The display screen 40 may include a liquid crystal display (Liquid Crystal Display, LCD) or an organic light-emitting diode (Organic Light-Emitting Diode, OLED) type display screen.

The display screen 40 may include a display area and a non-display area. The display area is used for displaying information, and the non-display area does not display information. The sound outlet 11 is provided in the non-display area of the display screen 40 .

It can be understood that a cover plate may also be provided on the display screen 40 to protect the display screen 40 and prevent the display screen 40 from being scratched or damaged by water. The cover plate may be a transparent glass cover plate, so that the user can observe the content displayed on the display screen 40 through the cover plate. It can be understood that the cover plate can be a glass cover plate made of sapphire. Among them, the sound outlet hole 11 can penetrate through the cover plate, so as to realize the better pronunciation function of the receiver 20 .

The middle frame 50 may have a thin plate-like or sheet-like structure, or a hollow frame structure. The housing 10 may be jointly formed by the middle frame 50 and the back cover 60, and the middle frame 50 is used to provide support for the electronic devices or functional components in the electronic device 100, so as to install the electronic devices and functional components of the electronic device 100 into the electronic device 100. Together. For example, the middle frame 50 may be provided with structures such as the accommodating cavity 12 , grooves, protrusions, through holes, etc., so as to facilitate the installation of electronic devices or functional components of the electronic device 100 . It can be understood that the material of the middle frame 50 may include metal or plastic. The diaphragm surface of the receiver 20 is disposed toward the side where the display screen 40 is located, and the diaphragm back of the receiver 20 is disposed away from the side where the display screen 40 is located.

The rear cover 60 is connected to the middle frame 50 . For example, the back cover 60 may be attached to the middle frame 50 by an adhesive such as double-sided tape to realize the connection with the middle frame 50 . The back cover 60 is used to seal the electronic devices and functional components of the electronic device 100 together with the middle frame 50 and the display screen 40 inside the electronic device 100 to protect the electronic devices and functional components of the electronic device 100 . It can be understood that the back cover 60 can be integrally formed. During the molding process of the back cover 60 , an opening may be formed on the back cover 60 , and the opening is used to install a structure such as a rear camera. The material of the back cover 60 includes metal, such as metal copper, metal aluminum, metal silver, and the like.

The circuit board 70 is disposed on the middle frame 50 for fixing, and the circuit board 70 is sealed inside the electronic device 100 through the back cover 60 . The circuit board 70 may be the main board of the electronic device 100 . The circuit board 70 may be integrated with a processor, and may also be integrated with one or more functional components such as a headphone jack, an acceleration sensor, a gyroscope, and a motor. Meanwhile, the display screen 40 may be electrically connected to the circuit board 70 to control the display of the display screen 40 by a processor on the circuit board 70 .

The battery 80 is disposed on the middle frame 50 , and is sealed inside the electronic device 100 through the back cover 60 . Meanwhile, the battery 80 is electrically connected to the circuit board 70 , so that the battery 80 can supply power to the electronic device 100 . Wherein, the circuit board 70 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 80 to the various electronic devices in the electronic device 100 .

The electronic device provided by the embodiments of the present application has been described in detail above. The principles and implementations of the present application are described herein by using specific examples, and the descriptions of the above embodiments are only used to help the understanding of the present application. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific embodiments and application scope. To sum up, the content of this specification should not be construed as a limitation to the present application.

Claims (10)

1. an electronic device, is characterized in that, comprises: a housing, the housing is provided with a sound outlet and a accommodating cavity; and A receiver, the receiver is arranged in the accommodating cavity, and divides the accommodating cavity into a first cavity and a second cavity, and the first cavity, the second cavity and the sound outlet are mutually connected; Wherein, when the receiver vibrates, a first sound wave signal is generated in the first cavity, and a second sound wave signal is generated in the second cavity, and the second sound wave signal and the first sound wave signal are at least partially offset. 2 . The electronic device according to claim 1 , wherein the casing is further provided with a first sound outlet channel and a second sound outlet channel, and the first cavity is connected with the first sound outlet channel through the first sound outlet channel. 3 . The sound outlet is in communication, and the second cavity communicates with the first cavity through the second sound outlet channel. 3 . The electronic device according to claim 2 , wherein the electronic device further comprises a mounting member, the mounting member is disposed in the accommodating cavity, and the mounting member is used for mounting a receiver. 4 . 4 . The electronic device according to claim 3 , wherein the second sound outlet channel is disposed on the mounting member, so that the second cavity can pass through the second sound outlet channel and the first sound outlet channel. 5 . A cavity is connected. 5 . The electronic device according to claim 1 , wherein the casing is further provided with a first sound outlet channel and a second sound outlet channel, and the first cavity is connected to the first sound outlet channel through the first sound outlet channel. 6 . The sound outlet is in communication, and the second cavity is communicated with the first sound outlet and the sound outlet through the second sound outlet channel. 6 . The electronic device according to claim 5 , wherein one end of the first sound outlet channel is in communication with the first cavity, and the other end of the first sound outlet channel is connected with the sound outlet hole. 7 . One end of the second sound outlet channel is communicated with the second cavity, and the other end of the second sound outlet channel is communicated with the first sound outlet channel. 7 . The electronic device according to claim 5 , wherein one end of the first sound outlet channel is communicated with the first cavity, and the other end of the first sound outlet channel is connected with the sound outlet hole. 8 . One end of the second sound outlet channel is communicated with the second cavity, and the other end of the second sound outlet channel is communicated with the sound outlet hole. 8 . The electronic device according to claim 5 , wherein the first sound output channel intersects or is parallel to the second sound output channel. 9 . 9. The electronic device according to any one of claims 1-8, wherein the electronic device further comprises: midframe; and The display screen is arranged on the middle frame, and the diaphragm surface of the receiver is arranged towards the display screen. 10. The electronic device according to any one of claims 1-8, wherein the electronic device further comprises a sealing member, the sealing member is disposed in the second cavity, and the sealing member surrounds the Set on the back of the diaphragm of the receiver.

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