WO2019064731A1 - Earphones - Google Patents

Abstract

An earphone (100) provided with a speaker (1) and a housing (2) for storing the speaker (1). The housing (2) has a first member (21) and a second member (23) assembled to the first member (21). The first member (21) has a cylindrical first wall (211) for shielding an internal space (H1) for storing the speaker (1) from the outside, and the second member (23) has a cylindrical second wall (232) for shielding the internal space (H1) from the outside. A groove (235) is provided at an end of one of the first wall (211) and the second wall (232), and the other ends (212) of the first wall (211) and the second wall (232) are inserted into the groove (235).

Description

earphone

The present disclosure relates to an earphone.

DESCRIPTION OF RELATED ART Conventionally, the earphone which accommodated the speaker in the housing which consists of several members (101, 103) by patent document 1 is disclosed. In this earphone, a plurality of members are connected in a hip joint shape in cross section. Specifically, the member (103) has a cylindrical wall portion, and has a connection structure in which the member (101) is fitted to the open end of the wall portion.

Patent No. 6136016 gazette

However, with the connection structure described above, when an external force is applied to the earphone, stress may concentrate on the connection structure portion according to the lever principle, and a gap may be generated between a plurality of members. . This gap leaks the air pushed out from the speaker to the outside, and greatly changes the acoustic characteristics of the earphone itself.

An object of the present disclosure is to provide an earphone capable of reducing a change in acoustic characteristics by suppressing air leakage from a housing.

An earphone according to an aspect of the present disclosure is an earphone including a speaker and a housing for housing the speaker, the housing including a first member and a second member assembled to the first member, One member has a cylindrical first wall that shields the internal space for housing the speaker from the outside, and the second member has a cylindrical second wall that shields the internal space from the outside, A groove is provided at one end of the first wall and the second wall, and the other end of the first wall and the second wall is inserted into the groove.

The earphone according to the present disclosure can reduce changes in acoustic characteristics by suppressing air leakage from the housing.

FIG. 1 is an external view showing the earphone according to the embodiment. FIG. 2 is an exploded perspective view of the earphone according to the embodiment. FIG. 3 is a cross-sectional view of the earphone as seen from the cross section including the III-III cut line in FIG. FIG. 4 is a cross-sectional view of the earphone as seen from the cross section including the IV-IV cutting line in FIG. FIG. 5 is an enlarged sectional view showing a part of FIG. 4 in an enlarged manner. FIG. 6 is an enlarged sectional view showing a part of FIG. 4 in an enlarged manner. FIG. 7 is an enlarged view showing a joint portion between the first member and the second member according to the modification.

An earphone according to an aspect of the present disclosure is an earphone including a speaker and a housing for housing the speaker, the housing including a first member and a second member assembled to the first member, The member has a cylindrical first wall that shields the internal space housing the speaker from the exterior, and the second member has a cylindrical second wall that shields the internal space from the exterior A groove is provided at one end of the wall and the second wall, and the other end of the first wall and the second wall is inserted into the groove.

According to this, after assembling the first member and the second member, the other end is inserted into the groove. That is, since the other end is sandwiched by the pair of opposing inner surfaces of the groove, the other end can be firmly held. Thereby, even if an external force acts, a gap is less likely to be generated between the first member and the second member, and air leakage can be suppressed. Therefore, it is possible to suppress the change in acoustic characteristics caused by the air leakage.

Moreover, the contact part which clamps the flame | frame with which a speaker is equipped is provided in each of a 1st member and a 2nd member.

According to this, since the contact part of each of the first member and the second member sandwiches the frame of the speaker, the speaker can be positioned. Thereby, the positional shift of the speaker in a housing can be suppressed, and the adhesiveness of a housing and a speaker can be improved. Therefore, the sealing performance in front of the speaker can be maintained.

Also, the groove and the other end are adhered by an adhesive.

According to this, since the groove and the other end are bonded by the adhesive, it is possible to reliably prevent the other end from coming off the groove. Therefore, it is possible to suppress the change of the acoustic characteristic caused by the air leakage in the long term.

In addition, a first gap is provided between the groove and the other end.

According to this, since the first gap is provided between the groove and the other end, even if there is a difference in the size due to the individual difference of the speakers, the difference in the size is the first gap. It can be absorbed. Furthermore, in the case where the groove and the other end are adhered with an adhesive, it is possible to fill the adhesive in the first gap.

Also, the groove and the other end are heat-welded.

According to this, since the groove and the other end are heat-welded, the other end can be reliably prevented from coming off the groove. Therefore, it is possible to suppress the change of the acoustic characteristic caused by the air leakage in the long term.

In addition, between a portion outward of the groove at one end of the first wall and the second wall and a portion outward of the other end of the first wall and the second wall A second gap is provided.

According to this, a portion of the first wall and one end of the second wall outside the groove and a portion of the first wall and the second wall outside the other end Since the second gap is provided between them, it is possible to absorb the difference in the size of the speaker due to the individual difference in the second gap. Furthermore, in the case where the groove and the other end are adhered with an adhesive, the leaked adhesive can be held in the second gap. Thereby, the appearance of the earphone can be maintained.

Also, the other end is located behind the front end of the frame provided to the speaker.

According to this, since the other end is located behind the front end of the frame provided to the speaker, the front of the speaker is sealed even if a gap is generated between the groove and the other end. It can be made difficult to inhibit sex. As a result, it is possible to reliably suppress the change in acoustic characteristics caused by the air leakage.

Also, the other end is located behind the rear end of the frame.

According to this, since the other end is located behind the rear end of the frame provided to the speaker, the front of the speaker is obtained even if a gap is generated between the groove and the other end. Sealability can be made more difficult to inhibit. This makes it possible to more reliably suppress the change in acoustic characteristics caused by the air leakage.

Hereinafter, the earphone according to one aspect of the present disclosure will be specifically described with reference to the drawings.

The embodiments described below each show one specific example of the present disclosure. Numerical values, shapes, materials, components, arrangement positions and connection forms of the components, processing, order of processing, and the like shown in the following embodiments are merely examples, and are not intended to limit the present disclosure. Further, among the components in the following embodiments, components not described in the independent claim indicating the highest concept are described as arbitrary components.

Embodiment
The earphone according to the embodiment will be described with reference to FIGS.

[1-1. Constitution]
FIG. 1 is an external view showing the earphone according to the embodiment. FIG. 2 is an exploded perspective view of the earphone according to the embodiment. FIG. 3 is a cross-sectional view of the earphone as seen from the cross section including the III-III cut line in FIG. FIG. 4 is a cross-sectional view of the earphone as seen from the cross section including the IV-IV cutting line in FIG.

As shown in FIGS. 1 to 4, the earphone 100 includes a speaker 1, a housing 2, an ear tip 3 and a cable 4. The earphone 100 is an inner-ear type headphone.

[1-2. Speaker]
The speaker 1 includes a diaphragm 10, a frame 30, and a magnetic circuit 50, as shown in FIGS. The speaker 1 further includes a stopper 20, a spacer 70, a substrate 80, and a dustproof net 90. In the speaker 1, the direction in which the sound is emitted from the speaker 1 is referred to as the front, and the opposite direction is referred to as the back.

The diaphragm 10 has a shape in which the vicinity of the center when viewed from the front bulges to the front side relative to the outer peripheral edge. The diaphragm 10 is provided with an outer peripheral ring 11 at the outer peripheral edge, and is supported by the frame 30 by fixing the outer peripheral ring 11 to the frame 30.

The frame 30 is a cylindrical member, and supports the diaphragm 10 at its front end. The frame 30 accommodates the stopper 20 and the magnetic circuit 50 inside. The outer peripheral surface of the rear end portion of the frame 30 is provided with a protrusion 31 projecting rearward. The frame 30 is made of, for example, metal, resin or the like. The substrate 80 and the dustproof net 90 are disposed at the end of the frame 30 opposite to the diaphragm 10 in the front-rear direction.

The magnetic circuit 50 is, for example, an internal magnet type magnetic circuit composed of a plate, a magnet and a yoke. The magnetic circuit 50 may be an external magnet type magnetic circuit. The magnetic circuit 50 has a through hole at its center.

The stopper 20 is a member for preventing the diaphragm 10 from coming too close to the magnetic circuit 50. The stopper 20 protrudes toward the diaphragm 10 more than the magnetic circuit 50, and has a shape following the shape of the diaphragm 10. The stopper 20 has a through hole at its center. The stopper 20 is made of, for example, metal, resin or the like.

The voice coil 40 is a coiled member configured by winding a metallic wire in a ring shape (cylindrical shape) a plurality of times. The voice coil 40 has an input terminal (not shown) to which an electrical signal is input. The voice coil 40 is fixed to the diaphragm 10. The voice coil 40 is disposed in the magnetic gap of the magnetic circuit 50.

The spacer 70 is a member for forming a sound tube by forming a space with the magnetic circuit 50 and the substrate 80. Specifically, the spacer 70 has a through hole at its center. Further, the spacer 70 is disposed between the magnetic circuit 50 and the substrate 80.

The substrate 80 has a circuit for electrically connecting the input terminal of the voice coil 40 and a terminal for acquiring an external electrical signal. The circuit may convert an electrical signal acquired from the outside and output the converted electrical signal to the input terminal of the voice coil 40. The substrate 80 is disposed on the side opposite to the side on which the magnetic circuit 50 of the spacer 70 is disposed. The substrate 80 has a through hole at its center. A sound pipe is formed by the through holes of the substrate 80, the through holes of the spacer 70, the through holes of the magnetic circuit 50, and the through holes of the stopper 20 coaxially. There is.

The dustproof net 90 is a net that covers the through hole of the substrate 80. The dustproof net 90 is disposed on the side of the substrate 80 opposite to the side on which the spacer 70 is disposed.

[1-3. housing]
The housing 2 is a housing that accommodates the speaker 1. In the housing 2, a space for housing the speaker 1 is taken as an internal space H1. The housing 2 includes a port 21, a box 23 and a back cover 25. The port 21, the box 23, and the back cover 25 are formed of, for example, resin or metal.

The port 21 is a member that holds the speaker 1 together with the box 23. The port 21 includes a main body portion 210 and an attachment portion 220.

The main body portion 210 is formed in a bottomed cylindrical shape whose rear end is opened. Specifically, the main body portion 210 includes a wall portion 211 and a bottom portion 214.

The wall portion 211 is formed in a cylindrical shape, and is a portion that blocks the internal space H1 from the outside. The rear end portion of the wall portion 211 is thinner than the portion on the front side than the rear end portion. For this reason, the rear end portion of the wall portion 211 is a protrusion 212 which protrudes rearward from a portion on the front side of the rear end portion. In this embodiment, although the case where the projection 212 is continuously formed over the entire circumference of the wall portion 211 is illustrated, the projection 212 may be provided intermittently. Moreover, the notch 213 is provided in the position corresponding to the protrusion 31 of the speaker 1 at the protrusion 212 (refer FIG. 2).

FIG. 5 is an enlarged sectional view showing the inside of the rectangle R1 in FIG. 4 in an enlarged manner. As shown in FIG. 5, at the front end portion inside the wall portion 211, an abutting portion 218 that abuts the speaker 1 is provided. Specifically, the contact portion 218 is a portion that protrudes inward from the front end portion of the wall portion 211. The rear end surface of the contact portion 218 is flat. The rear end surface of the contact portion 218 is in contact with the outer peripheral ring 11 of the speaker 1 from the front. Thereby, the rear end surface of the contact portion 218 is opposed to the front end portion of the frame 30 of the speaker 1 via the outer peripheral ring 11. The contact portion 218 is provided over the inner peripheral surface of the wall portion 211 except for the portion corresponding to the notch 213 (see FIG. 3). Further, in a state where the speaker 1 is in contact with the contact portion 218, the tip end of the protrusion 212 is located rearward of the rear end portion of the frame 30.

As shown in FIG. 3 and FIG. 4, a through hole 215 is formed at the center of the bottom portion 214 of the main body portion 210. The through hole 215 is opposed to the through hole (the through hole of the substrate 80, the through hole of the spacer 70, the through hole of the magnetic circuit 50, and the through hole of the stopper 20) forming the sound tube of the speaker 1 through the diaphragm 10. doing. The mounting portion 220 is formed in a cylindrical shape so as to surround the through hole 215 of the bottom portion 214. The attachment portion 220 protrudes from the main body portion 210 and is a portion to which the ear tip 3 is attached. A protective net 91 covering the opening formed by the attachment portion 220 is attached to the tip of the attachment portion 220.

The box 23 is a member that holds the speaker 1 together with the port 21. Specifically, the box 23 includes a base 231 and a cylindrical wall 232 surrounding the entire circumference of the base 231.

The base portion 231 is formed in a disc shape, and a through hole 233 is formed at the center thereof. A protective net 92 covering the through hole 233 is attached to the front of the base 231. Further, in the vicinity of the through hole 233, a through hole 234 through which the cable 4 passes is formed.

The wall portion 232 is formed in a cylindrical shape, and is a portion that blocks the internal space H1 and the outside. The port 21 is assembled to the front end portion of the wall portion 232, and the back cover 25 is assembled to the rear end portion.

FIG. 6 is an enlarged sectional view showing the inside of the rectangle R2 in FIG. 4 in an enlarged manner. As shown in FIG. 6, a first groove portion 235 is provided at the front end portion of the wall portion 232 along the entire circumference of the wall portion 232. The wall portion 232 is provided with an outer outer wall 236 and an inner inner wall 237 on the basis of the first groove portion 235. The front outer wall 236 has a shape projecting forward relative to the front inner wall 237. That is, the amount of protrusion of the front outer wall 236 is larger than that of the front inner wall 237 based on the bottom surface of the first groove portion 235. In the first groove portion 235, as shown in FIG. 3, the protrusion 31 of the speaker 1 and the protrusion 212 of the port 21 are inserted.

As shown in FIG. 6, the projection 212 and the projection 31 are sandwiched by the front outer wall 236 and the front inner wall 237 in the first groove portion 235. A first gap S10 is provided between the tip of the protrusion 212 and the bottom surface of the first groove portion 235. A gap S11 (see FIG. 3) is also provided between the tip end of the protrusion 31 and the bottom surface of the first groove portion 235. The first gap S10 and the gap S11 are gaps in the front-rear direction, that is, in the height direction of the speaker 1.

An adhesive 60 is filled in the first gap S10 and the gap S11, and the protrusion 212 and the protrusion 31 are bonded to the first groove portion 235 by the adhesive 60. A slight clearance is also provided between the projection 212 and the projection 31 and the front outer wall 236 and the front inner wall 237. Since the adhesive 60 penetrates into the clearance, the projections 212 and the projections 31 can be more firmly adhered to the first groove portion 235. In addition, if a clearance is provided between the projection 212 and the projection 31 and the front outer wall 236 and the front inner wall 237, the projection 212 and the projection 31 may not be pressed into the first groove portion 235 at the time of assembly. That is, after assembly, no stress caused by the press-fit is generated. This stress also contributes to the deformation of the housing 2. The deformation of the housing 2 changes the acoustic characteristics of the speaker 1. However, since the stress itself does not occur, it is possible to suppress the change in the acoustic characteristic of the speaker 1. In addition, as long as generation | occurrence | production of this stress is not considered, the structure which press-fits the protrusion 212 and the protrusion 31 in the 1st groove part 235 may be used.

A second gap S20 is provided between the front outer wall 236 and a portion of the wall portion 211 which is more outward than the protrusion 212. The second gap S20 is a gap in the front-rear direction, that is, the height direction of the speaker 1. The second gap S20 allows the adhesive 60 protruding from the first groove portion 235 to be retained. As a result, the adhesive 60 can be prevented from protruding to the outer peripheral surface of the port 21 and the box 23.

The front inner wall 237 is a contact portion that contacts the speaker 1. Specifically, the front end surface of the front inner wall 237 is flat, and the front end surface is in contact with the frame 30 of the speaker 1 from the rear. Thus, the frame 30 of the speaker 1 is held in the front-rear direction by the front inner wall 237 as the contact portion and the contact portion 218 of the port 21.

As shown in FIGS. 3 and 4, a second groove 245 is provided at the rear end of the wall 232 along the entire circumference of the wall 232. The wall portion 232 is provided with an outer rear outer wall 246 and an inner rear inner wall 247 with reference to the second groove portion 245. The rear outer wall 246 has a shape projecting rearward than the rear inner wall 247. That is, the amount of protrusion of the rear outer wall 246 is larger than that of the rear inner wall 247 based on the bottom surface of the second groove portion 245. The back cover 25 is attached to the second groove 245.

The back cover 25 is a member that covers the rear end of the box 23. The back cover 25 is formed in a bottomed cylindrical shape whose front end is open. Specifically, the back cover 25 includes a wall portion 251 and a bottom portion 254.

The wall portion 251 is formed in a cylindrical shape, and is a portion that blocks the internal space H1 from the outside. The front end of the wall 251 is inserted into the second groove 245 of the wall 232 in the box 23. The front end portion of the wall portion 251 is sandwiched between the rear outer wall 246 and the rear inner wall 247 in the second groove portion 245. A first gap S <b> 15 is provided between the front end of the wall 251 and the bottom of the second groove 245. An adhesive 60 is filled in the first gap S15, and the front end portion of the wall portion 251 and the second groove portion 245 are adhered by the adhesive 60. A slight clearance is also provided between the front end of the wall 251 and the rear outer wall 246 and the rear inner wall 247. Since the adhesive 60 penetrates into the clearance, the front end of the wall 251 and the second groove 245 can be more firmly bonded. In addition, if a clearance is provided between the front end of the wall 251 and the rear outer wall 246 and the rear inner wall 247, the front end of the wall 251 may not be pressed into the second groove 245 at the time of assembly. That is, after assembly, no stress caused by the press-fit is generated. This stress also contributes to the deformation of the housing 2. The deformation of the housing 2 changes the acoustic characteristics of the speaker 1. However, since the stress itself does not occur, it is possible to suppress the change in the acoustic characteristic of the speaker 1. If the generation of the stress is not taken into consideration, the front end of the wall 251 may be press-fit into the second groove 245.

Further, the wall portion 251 is provided with a through hole 253 through which the cable 4 passes. The through hole 253 penetrates the wall 251 in a direction intersecting in the front-rear direction.

The bottom portion 254 is formed with a groove 255 coaxially extending with the through hole 253. Since the cable 4 is disposed in the groove 255, the cable 4 can be stably held.

[1-4. Ear tip]
The ear tip 3 is a member connected to the attachment portion 220 of the port 21 for disposing the earphone 100 inside a person's ear canal. The ear tip 3 is made of, for example, a resin.

[1-5. cable]
The cable 4 is a member for inputting an electrical signal to the speaker 1. Specifically, the cable 4 is connected to the substrate 80 of the speaker 1 in a state of penetrating the through hole 253 of the back cover 25 and the through hole 234 of the box 23.

In the earphone 100 configured in this manner, the sound output from the speaker 1 according to the electrical signal input through the cable 4 is output from the port 21 and the ear tip 3. For this reason, when the ear tip 3 is attached to a person's external ear canal, the person can hear the sound from the earphone 100.

[2. Effect etc]
The earphone according to the present embodiment is an earphone 100 including the speaker 1 and the housing 2 for housing the speaker 1, and the housing 2 has the first member and the second member assembled to the first member. The first member has a cylindrical first wall portion that shields the internal space H1 housing the speaker 1 from the outside, and the second member a cylindrical second wall that shields the internal space H1 from the outside And one end of the first wall and the second wall is provided with a groove, and the other end of the first wall and the second wall is inserted into the groove There is.

Here, in the above embodiment, when the first member is the port 21 and the second member is the box 23, the first wall is the wall 211 of the port 21 and the second wall is the wall of the box 23. It is 232. In this case, the groove is the first groove 235 provided in the wall 232, and the other end inserted in the groove is the protrusion 212 of the wall 211.

According to this, after the port 21 and the box 23 are assembled, the protrusion 212 is inserted into the first groove portion 235. That is, since the projection 212 is sandwiched between the pair of opposing inner surfaces of the first groove portion 235 (the inner surfaces of the front outer wall 236 and the front inner wall 237), the projection 212 can be firmly held. Thereby, even if an external force acts, a gap is less likely to be generated between the port 21 and the box 23, and air leakage can be suppressed. Therefore, it is possible to suppress the change in acoustic characteristics caused by the air leakage.

On the other hand, in the above embodiment, when the first member is the back cover 25 and the second member is the box 23, the first wall is the wall 251 of the back cover 25 and the second wall is the wall of the box 23. It is the part 232. In this case, the groove is the second groove 245 provided in the wall 232, and the other end inserted in the groove is the front end of the wall 251. That is, also in the joint portion of the back cover 25 and the box 23, the same effect as the joint portion of the port 21 and the box 23 can be obtained. In the following description of the effects, the case where the first member is the port 21 and the second member is the box 23 will be described, and the case where the first member is the back cover 25 and the second member is the box 23 Is omitted.

Further, each of the first member (port 21) and the second member (box 23) is provided with a contact portion (contact portion 218, front inner wall 237) for holding the frame 30 provided in the speaker 1.

According to this, since the contact portion 218 of the port 21 and the front inner wall 237 of the box 23 sandwich the frame 30 of the speaker 1, the speaker 1 can be positioned. Thereby, positional deviation of the speaker 1 in the housing 2 can be suppressed, and the adhesion between the housing 2 and the speaker 1 can be enhanced. Therefore, the sealing performance in front of the speaker 1 can be maintained.

Further, the groove (first groove 235) and the other end (protrusion 212) are bonded by an adhesive.

According to this, since the first groove portion 235 and the protrusion 212 are bonded by the adhesive 60, it is possible to reliably prevent the protrusion 212 from being detached from the first groove portion 235. Therefore, it is possible to suppress the change of the acoustic characteristic caused by the air leakage in the long term.

In addition, a first gap S10 is provided between the groove (first groove 235) and the other end (protrusion 212).

According to this, since the first gap S10 is provided between the first groove portion 235 and the protrusion 212, even if there is a difference in the size due to the individual difference of the speaker 1, the difference in the size is It can absorb by one gap S10. For example, since the first gap S10 is a gap in the height direction of the speaker 1, it is possible to absorb the difference in height of the speaker 1 due to the individual difference. Furthermore, in the case of bonding the first groove portion 235 and the protrusion 212 with the adhesive 60, it is possible to fill the adhesive in the first gap S10.

Further, a portion outward of the groove (first groove 235) at one end of the first wall (wall 211) and the second wall (wall 232), and the first wall and the second wall. A second gap S20 is provided between the other end of the portion (protrusion 212) and the portion further outward.

According to this, the second gap S20 is provided between the front outer wall 236 on the outer side than the first groove portion 235 in the wall portion 232 and the portion on the outer side of the protrusion 212 on the wall portion 211. The difference in the size of the speaker 1 due to the individual difference can be absorbed by the second gap S20. For example, since the second gap S20 is a gap in the height direction of the speaker 1, it is possible to absorb the difference in height of the speaker 1 due to the individual difference. Furthermore, when the first groove portion 235 and the protrusion 212 are bonded with the adhesive 60, the leaked adhesive 60 can be held at the second gap S20. Thereby, the appearance of the earphone 100 can be maintained.

Further, the other end (protrusion 212) is located rearward of the rear end of the frame 30.

According to this, since the projection 212 is located rearward of the rear end of the frame 30 provided in the speaker 1, the speaker 1 is produced even if a gap is generated between the first groove portion 235 and the projection 212. Can be made more difficult to inhibit. This makes it possible to more reliably suppress the change in acoustic characteristics caused by the air leakage.

[3. Modified example]
In the said embodiment, the case where the 1st member and the 2nd member were joined by the adhesive agent 60 was illustrated. However, it is also possible to join the first member and the second member by a bonding method other than the adhesive.

FIG. 7 is an enlarged view showing a joint portion between the first member and the second member according to the modification. Specifically, FIG. 7 corresponds to FIG. That is, in this modification, the case where the first member is a port and the second member is a box will be described. In the following description, parts equivalent to those in the above embodiment may be assigned the same reference numerals and descriptions thereof may be omitted.

As shown in FIG. 7, the projection 212 of the wall portion 211 at the port 21 is thermally welded to the wall portion 232 of the box 23 in the first groove portion 235. Specifically, after the port 21 is assembled to the box 23, the boundary portion between the protrusion 212 and the first groove portion 235 is heat welded, for example, by laser welding, ultrasonic welding or the like. In FIG. 7, the hatched portion h shows a portion heat-welded.

As described above, since the first groove portion 235 and the protrusion 212 are thermally welded, it is possible to reliably prevent the protrusion 212 from being detached from the first groove portion 235. Therefore, it is possible to suppress the change of the acoustic characteristic caused by the air leakage in the long term.

It is also possible to join the box and the port by a mechanical joining method. Mechanical connection structures include screw structures, snap fit structures, and the like. In the case of a screw structure, for example, an internal thread is formed in the first groove of the box, an external thread is formed on the projection of the port, and the external thread and the internal thread are tightened. And can be joined. In the case of the snap fit structure, for example, a convex portion is formed on the protrusion of the port, a concave portion is formed with respect to the first groove portion of the box, and the convex portion is fitted to the concave portion. Can be joined.

In addition, it is also possible to join the box 23 and the back cover 25 by heat welding or a mechanical joining method.

[4. Other Embodiments]
As mentioned above, although the earphone concerning this indication was explained based on the above-mentioned embodiment and each modification, this indication is not limited to the above-mentioned embodiment and each modification.

For example, in the above embodiment, the groove (first groove 235) is provided to the wall 232 of the box 23, and the rear end (projection 212) of the wall of the port 21 is inserted into the groove. Illustrated. However, a groove may be provided at the rear end of the wall of the port, and the front end of the wall of the box may be inserted into the groove. The same applies to the junction between the box and the back cover.

Further, in the above embodiment, the case where the front end of the projection 212 is located rearward of the rear end of the frame 30 has been exemplified. However, the tip of the projection 212 may be located rearward of the front end of the frame 30. In this case, even if a gap is generated between the first groove portion 235 and the projection 212, the sealing performance in front of the speaker can be made difficult to a certain extent.

In addition, the embodiment can be realized by arbitrarily combining components and functions in the embodiment and each modification without departing from the scope obtained by applying various modifications that those skilled in the art would think to the embodiment, and the scope of the present disclosure. The forms to be included are also included in the present disclosure.

The present disclosure is useful as an earphone with less change in acoustic characteristics.

Reference Signs List 1 speaker 2 housing 3 ear tip 4 cable 10 diaphragm 11 outer peripheral ring 20 stopper 21 port (first member)
23 Box (second member)
25 back cover (first member)
Reference Signs List 30 frame 31 protrusion 40 voice coil 50 magnetic circuit 60 adhesive 70 spacer 80 substrates 90, 91, 92 dustproof net 100 earphone 210 main body portion 211 wall portion (first wall portion)
212 projection (other end)
214 bottom portion 215, 233, 234, 253 through hole 218 contact portion 220 mounting portion 231 base portion 232 wall (second wall)
235 First groove (groove)
236 front outer wall 237 front inner wall 245 second groove (groove)
246 back outer wall 247 back inner wall 251 wall (first wall)
254 bottom 255 groove h shaded area (heat-welded area)
H1 Internal space S10, S15 First clearance S11 Clearance S20 Second clearance

Claims (8)

An earphone comprising a speaker and a housing for housing the speaker, the earphone comprising:
The housing has a first member and a second member assembled to the first member,
The first member has a cylindrical first wall portion that blocks an internal space for housing the speaker and the outside,
The second member has a cylindrical second wall that blocks the internal space and the outside,
A groove is provided at one end of the first wall and the second wall,
The other end of the first wall and the second wall is inserted in the groove. The earphone according to claim 1, wherein each of the first member and the second member is provided with a contact portion that holds a frame provided to the speaker. The earphone according to claim 1, wherein the groove and the other end are adhered by an adhesive. The earphone according to any one of claims 1 to 3, wherein a first gap is provided between the groove and the other end. The earphone according to claim 1, wherein the groove and the other end are heat-welded. A portion of the first wall portion and one end portion of the second wall portion outward of the groove portion, and a portion outward of the other end portion of the first wall portion and the second wall portion; The earphone according to any one of claims 1 to 5, wherein a second gap is provided between the two. The earphone according to any one of claims 1 to 6, wherein the other end is located rearward of a front end of a frame provided to the speaker. The earphone according to claim 7, wherein the other end is located rearward of a rear end of the frame.

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