WO2016031044A1

WO2016031044A1 - Headphone

Info

Publication number: WO2016031044A1
Application number: PCT/JP2014/072718
Authority: WO
Inventors: 正規伊藤; 敦白田
Original assignee: ＰｉｏｎｅｅｒＤＪ株式会社
Priority date: 2014-08-29
Filing date: 2014-08-29
Publication date: 2016-03-03

Abstract

Provided is a headphone in which a housing (5) accommodates a speaker unit (4) with the sound emission direction thereof oriented outward. An interior space is formed between the housing (5) and the speaker unit (4). An air chamber is formed within the housing (5). First connecting holes connect the air chamber and the internal space. Second connecting holes connect the air chamber and the external space. A movement limiting member (6) limits the movement of air that passes through at least one of the first connecting holes and the second connecting holes.

Description

headphone

The present invention relates to headphones.

Conventionally, headphones have been proposed in which an internal space formed between a housing and a speaker unit is communicated with an external space through a communication hole provided in the housing to increase the sound pressure in the low frequency range. However, in the headphones having such a configuration, noise in the external space may enter the internal space through the communication hole.

Therefore, it is considered to reduce this noise by providing an air chamber between the internal space and the external space and communicating the internal space and the external space through this air chamber (Patent Document 1). However, the problem with such headphones is that a dip is likely to occur in a part of the frequency characteristics.

Therefore, it is conceivable to reduce the dip by increasing the acoustic resistance of the communication hole between the external space and the air chamber and the communication hole between the air chamber and the internal space. As a proposal for increasing the acoustic resistance of the communication hole, it is conceivable to provide a very thin slit, but it is difficult to realize such a slit due to restrictions on the mold of the housing.

Japanese Utility Model Publication No. 62-141293

The present invention is an example of a problem to deal with such problems. That is, an object of the present invention is to provide a headphone with a reduced dip appearing in frequency characteristics, for example.

In order to solve the above-described problem, a headphone according to claim 1 includes a speaker unit that emits sound, a housing that houses the speaker unit with a sound radiation direction facing outward, and a space between the housing and the speaker unit. An internal space formed in the housing, an air chamber formed in the housing, a first communication hole communicating between the air chamber and the internal space, and a first communication hole communicating between the air chamber and the external space. And a braking member that brakes air passing through at least one of the first communication hole and the second communication hole.

It is a schematic front view which shows the headphones of a present Example. It is the II sectional view taken on the line of FIG. 1 in the first embodiment. (A) is an equivalent circuit of a conventional headphone dynamic system, and (B) is an equivalent circuit of a headphone dynamic system in the first embodiment. (A) It is a graph which shows the ideal frequency characteristic of the conventional headphones, (B) is a graph which shows the actual frequency characteristic of the conventional headphones, (C) shows the frequency characteristic of the headphones in the present embodiment. It is a graph. It is the II sectional view taken on the line of FIG. 1 in 2nd Example. It is an equivalent circuit of the dynamic system of the headphones in 2nd Example. It is the II sectional view taken on the line of FIG. 1 in 3rd Example. It is the equivalent circuit of the dynamics system of the headphones in 3rd Example. It is sectional drawing of the headphone main body in 4th Example. FIG. 10 is an exploded side view of the headphone body shown in FIG. 9. It is an II arrow line view of FIG. It is a bottom view of the air chamber formation part shown in FIG. FIG. 10 is a top view of the housing body and the air chamber forming portion shown in FIG. 9. It is sectional drawing of the earphone as a headphone of this invention in 5th Example.

Hereinafter, headphones according to an embodiment of the present invention will be described. A headphone according to an embodiment of the present invention includes a speaker unit that emits sound, a housing that houses the speaker unit with the sound radiation direction facing outward, an internal space formed between the housing and the speaker unit, and a housing An air chamber formed therein, a first communication hole that communicates between the air chamber and the internal space, a second communication hole that communicates between the air chamber and the external space, a first communication hole, and a first communication hole. And a braking member that brakes air passing through at least one of the two communication holes.

This braking material can easily increase the acoustic resistance in at least one of the first communication hole and the second communication hole, and can reduce the dip appearing in the frequency characteristics.

Further, the braking material may be provided at the end of the first communication hole on the inner space side. Thereby, the acoustic resistance in the 1st communicating hole can be enlarged, and the dip which appears in a frequency characteristic can be made small.

Further, the braking material may be provided at the end of the first communication hole on the air chamber side. Thereby, the acoustic resistance in the 1st communicating hole can be enlarged, and the dip which appears in a frequency characteristic can be made small.

Further, the braking material may be provided at the end of the second communication hole on the air chamber side. Thereby, the acoustic resistance in the 2nd communicating hole can be enlarged, and the dip which appears in a frequency characteristic can be made small. In addition, dust and sand can be prevented from entering the air chamber in the housing from the external space by the braking material.

Further, the braking material may be a non-woven fabric. Thereby, a braking material can be formed easily.

Further, the braking material may be a net. Thereby, a braking material can be formed easily.

Moreover, a plurality of first communication holes may be formed. Thereby, it is possible to prevent dust and sand from entering the air chamber of the housing by forming a plurality of small first communication holes as compared to forming one large first communication hole.

Moreover, a plurality of second communication holes may be formed. Accordingly, it is possible to prevent dust and sand from entering the housing by forming a plurality of small second communication holes as compared to forming one large second communication hole.

The housing may be formed with an opening hole penetrating the housing and communicating with the external space, and the second communication hole may be formed on the inner wall of the opening hole. Thereby, since the 2nd communicating hole exists in a housing, ambient sound and dust cannot enter easily from the 2nd communicating hole.

The air chamber may be formed on the side opposite to the sound radiation direction from the opening hole, and the second communication hole may be formed on the inner wall on the side opposite to the sound radiation direction of the opening hole. Thereby, since the 2nd communicating hole exists in a housing, ambient sound and dust cannot enter easily from the 2nd communicating hole.

(First embodiment)
Hereinafter, the headphones in the first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing the headphones of this embodiment. FIG. 2 is a partial cross-sectional view taken along the line II of FIG. 1 in the first embodiment.

As shown in the figure, the headphone 1 includes a pair of headphone main bodies 2 and a headband 3 connecting the pair of headphone main bodies 2.

Each of the pair of headphone main bodies 2 includes a speaker unit 4 that emits sound, a housing 5 that houses the speaker unit 4 with the sound radiation direction Y1 facing outward, and a braking member 6. The speaker unit 4 is a known speaker unit having a magnetic circuit, a voice coil, a diaphragm, and the like.

The housing 5 includes a housing main body 51 in which the sound emission direction Y1 side of the speaker unit 4 is opened, a lid 52 to which the speaker unit 4 is attached and covers the opening of the housing main body 51, and a sound emission direction Y1 of the housing main body 51 And a cover portion 53 that covers the reverse side Y2.

The housing body 51 has a substantially circular bottom 51a and a peripheral wall 51b erected from the periphery of the bottom 51a in the sound emission direction Y1, and is formed in a saucer shape in which the sound emission direction Y1 is opened. Yes. A groove that is recessed toward the opposite side Y2 is formed on the end surface on the sound radiation direction Y1 side of the peripheral wall portion 51b. That is, the peripheral wall 51b is a double wall in which an inner wall 51c is formed inside the groove and an outer wall 51d is formed outside the groove. In the present embodiment, the outer wall portion 51d is provided so as to protrude from the inner wall portion 51c toward the sound emission direction Y1. The groove between the inner wall portion 51c and the outer wall portion 51d may be provided on the entire circumference of the peripheral wall portion 51b or may be provided on a part thereof.

The lid 52 is provided with a substantially disc-shaped lid main body 52a provided with an opening to which the speaker unit 4 is attached at the center, and an inner wall portion of the housing main body 51 standing from the lid main body 52a toward the opposite side Y2. And a standing wall portion 52b that is overlapped so as to be continuous with 51c. Moreover, the opening of the groove | channel provided in the surrounding wall part 51b of the housing main body 51 mentioned above is block | closed by the lid main body part 52a outside the standing wall part 52b. The cover portion 53 is provided so as to cover the opposite side Y2 of the housing body 51.

An internal space C11 is formed between the housing 5 and the speaker unit 4 described above, that is, on the opposite side to the sound emission direction Y1 of the speaker unit 4 in the housing 5. More specifically, the space surrounded by the bottom 51a, the peripheral wall 51b, and the lid 52 of the housing body 51 is the internal space C11.

In the housing 5, an air chamber C12 is formed. More specifically, the space in the groove between the inner wall portion 51c and the outer wall portion 51d of the housing body 51 becomes the air chamber C12.

The internal space C11 and the air chamber C12 are partitioned by an inner wall portion 51c and a standing wall portion 52b, and are communicated with each other through a first communication hole 7 provided in the inner wall portion 51c and the standing wall portion 52b. A plurality of first communication holes 7 are formed. A second communication hole 8 is provided in the outer wall 51d of the housing body 51, and the air chamber C12 communicates with the external space through the second communication hole 8. A plurality of second communication holes 8 are formed.

The braking material 6 is provided in the form of a sheet made of non-woven fabric, and is provided at the end of the first communication hole 7 on the inner space C11 side. More specifically, a single sheet-like braking member 6 is attached to the inner side surfaces of the inner wall portion 51c and the standing wall portion 52b so as to cover the plurality of first communication holes 7.

According to the first embodiment described above, the braking material 6 is provided at the end of the first communication hole 7 on the inner space C11 side. Thereby, the acoustic resistance in the 1st communicating hole 7 can be enlarged, and the dip which appears in a frequency characteristic can be made small.

Also, according to the first embodiment described above, a plurality of first communication holes 7 and a plurality of second communication holes 8 are formed. Thus, by forming a plurality of small first communication holes 7 and second communication holes 8 as compared to forming one large first communication hole 7 and one second communication hole 8, It is possible to prevent dust and sand from entering.

Next, the reason why the dip appearing in the frequency characteristics can be reduced by the braking material 6 will be described. It is generally known that various quantities of a dynamic system can be equivalent to each element of an electric circuit as shown in the following table.

FIG. 3A shows an equivalent circuit of the conventional headphone 1 without the braking material 6. In the figure, Md = equivalent mass of the vibration system of the headphone 1, Cd = compliance of the vibration system of the headphone 1, Rd = acoustic resistance of the vibration system of the headphone 1, Ra = penetrating in the sound radiation direction Y1 provided in the speaker unit 4 Acoustic resistance of the through-hole, Cb1 = compliance of the internal space C11, Cb2 = compliance of the air chamber C12, Mb12 = equivalent mass of air in the first communication hole 7, Mb20 = air in the second communication hole 8 Equivalent mass, Rb2 = represents the acoustic resistance associated with the air chamber C12 and the first and second communication holes 7, 8.

In the figure, the part surrounded by a dotted line represents the equivalent circuit of the air chamber C12. An equivalent circuit surrounded by a dotted line without air resistance Rb2 constitutes a third-order K-type low-pass filter. This third-order K-type low-pass filter ideally (= no air resistance Rb2) has a frequency characteristic as shown in FIG. 4A and produces a sound higher than the cutoff frequency fa higher than the cutoff frequency fa. Attenuates to increase the sound pressure in the low range. However, in practice, the air resistance Rb2 is connected in parallel to the compliance Cb2 of the air chamber C12. A parasitic inductance (not shown) of the air chamber C12 is connected in series to the compliance Cb2. As a result, a dip appears in the frequency characteristics as shown in FIG.

In the first embodiment, by providing the braking material 6 at the end of the first communication hole 7 on the inner space C11 side, as shown in FIG. 3B, the acoustic resistance Ra, the compliance Cb1, and the equivalent mass Mb12 It becomes an equivalent circuit in which the acoustic resistance Rs of the braking material 6 is connected therebetween. The acoustic resistance Rs is larger than the acoustic resistance Rb2. The acoustic resistance Rs reduces the influence of the third-order K-type low-pass filter surrounded by the dotted line on the entire circuit. As a result, the frequency characteristic of the headphone 1 of the first embodiment is as shown in FIG. The dip becomes smaller.

(Second embodiment)
Next, the headphones 1 according to the second embodiment will be described with reference to FIGS. 5 and FIG. 6, the same reference numerals are given to the same parts as the headphones shown in FIG. 2 and FIG. 3B described in the first embodiment, and the detailed description thereof is omitted. A significant difference between the first embodiment and the second embodiment is the position of the braking material 6. In the first embodiment, the braking material 6 is provided at the end of the first communication hole 7 on the inner space C11 side, whereas in the second embodiment, the braking material 6 is provided on the air chamber C12 side. 1 is provided at one end of the communication hole 7. More specifically, a single sheet-like braking member 6 is attached to the outer surfaces of the inner wall portion 51c and the standing wall portion 52b so as to cover the plurality of first communication holes 7.

The equivalent circuit of the vibration system of the headphones 1 of the second embodiment is as shown in FIG. That is, in the first embodiment, the acoustic resistance Rs of the braking material 6 is connected between the acoustic resistance Ra and the compliance Cb1 and the equivalent mass Mb12. However, in the second embodiment, the equivalent mass Mb12 and the equivalent mass Mb20 and An acoustic resistance Rs is connected between the compliance Cb2. Also in this case, similarly to the first embodiment, the acoustic resistance Rs has less influence on the entire circuit of the third-order K-type low-pass filter surrounded by the dotted line, and as a result, the frequency characteristics of the headphones 1 of the second embodiment are reduced. As in the first embodiment, the dip becomes small.

(Third embodiment)
Next, headphones according to the third embodiment will be described with reference to FIGS. 7 and 8, the same reference numerals are given to the same parts as the headphones shown in FIGS. 2 and 3B described in the first embodiment, and the detailed description thereof is omitted. A significant difference between the first embodiment and the third embodiment is the position of the braking material 6. In the first embodiment, the braking material 6 is provided at the end of the first communication hole 7 on the inner space C11 side, whereas in the third embodiment, the braking material 6 is provided on the air chamber C12 side. 2 at the end of the communication hole 8. More specifically, one sheet-like braking member 6 is attached to the inner side surface of the outer wall portion 51d so as to cover the plurality of second communication holes 8.

The equivalent circuit of the vibration system of the headphones 1 of the third embodiment is as shown in FIG. That is, in the first embodiment, the acoustic resistance Rs of the braking material 6 is connected between the acoustic resistance Ra and the compliance Cb1 and the equivalent mass Mb12. However, in the third embodiment, the equivalent is equivalent to the equivalent mass Mb12 and the compliance Cb2. The acoustic resistance Rs is connected between the mass Mb20. Also in this case, similarly to the first embodiment, the acoustic resistance Rs has less influence on the entire circuit of the third-order K-type low-pass filter surrounded by the dotted line, and as a result, the frequency characteristics of the headphones 1 of the third embodiment. As in the first embodiment, the dip becomes small.

According to the headphones 1 of the third embodiment, the braking material 6 can prevent dust and sand from entering the air chamber C12 of the housing 5 from the external space.

The braking material 6 may be provided so as to brake air passing through at least one of the first communication hole 7 and the second communication hole 8, and braking is performed in combination with the first to third embodiments described above. Two or more materials 6 may be provided. Moreover, you may equip the brake material 6 in the 2nd communicating hole 8 edge part in external space.

(Fourth embodiment)
Next, headphones according to the fourth embodiment will be described with reference to FIGS. The headphone 1 in the fourth embodiment includes a pair of headphone main bodies 9 and a headband (not shown) for connecting the pair of headphone main bodies 9 as in the first embodiment.

Each of the pair of headphone main bodies 9 includes a speaker unit 10 that emits sound, a housing 11 that houses the speaker unit 10 with the sound emission direction Y1 facing outward, and a braking member 12. The speaker unit 10 is a well-known speaker unit, similar to the speaker unit 4 of the first to third embodiments.

The housing 11 includes a housing main body 111 in which the sound emission direction Y1 side of the speaker unit 10 is opened, an air chamber forming portion 112 for forming an air chamber C22 in the housing main body 111, a cylindrical non-slip portion 113, And a lid part 114.

The housing main body 111 has a substantially circular bottom portion 111a and a peripheral wall portion 111b erected from the periphery of the bottom portion 111a toward the sound emission direction Y1, and is formed in a saucer shape in which the sound emission direction Y1 is opened. Yes. As shown in FIGS. 9 and 10, the peripheral wall 111b is provided with a pair of openings 111c facing each other. The pair of openings 111 c extend to the bottom 111 a of the housing body 111.

The air chamber forming portion 112 is provided in a substantially rectangular tube shape, one opening communicates with one of the pair of openings 111c of the peripheral wall portion 111b, and the other opening is connected to the other of the pair of openings 111c provided in the peripheral wall portion 111b. It is accommodated in the housing main body 111 so as to communicate. The opening 112c of the cylindrical air chamber forming portion 112 is an opening that penetrates the housing 11 and communicates with the external space. Further, a substantially square cylindrical peripheral wall portion 112 b that protrudes toward the bottom portion 111 a of the housing main body 111 is erected on the bottom portion 112 a of the air chamber forming portion 112.

The cylindrical non-slip portion 113 is provided between the housing main body 111 and a lid portion 114 to be described later. One opening communicates with the opening of the housing main body 111 and the other opening is covered by the lid portion 114. . The lid portion 114 is provided in a substantially disc shape with an opening to which the speaker unit 10 is attached at the center, and closes the other opening of the non-slip portion 113.

The internal space C21 is formed between the housing 11 and the speaker unit 10 described above. More specifically, the space inside the housing main body 111 and outside the air chamber forming portion 112 and the space inside the non-slip portion 113 becomes the internal space C21. In addition, since the space in the air chamber formation part 112 is connected to the opening of the peripheral wall part 111b of the housing main body 111 as mentioned above, it becomes an external space.

In the housing 11, an air chamber C22 is formed. More specifically, the space surrounded by the bottom 112a of the air chamber forming portion 112, the peripheral wall portion 112b, and the bottom 111a of the housing main body 111 is the air chamber C22. That is, the air chamber C22 is formed on the opposite side Y2 from the opening hole 112d.

When the air chamber forming portion 112 is accommodated in the housing main body 111, the opening of the peripheral wall portion 112 b is blocked by the bottom portion 111 a of the housing main body 111. As a result, an air chamber C <b> 22 surrounded by the bottom portion 112 a of the air chamber forming portion 112, the peripheral wall portion 112 b and the bottom portion 111 a of the housing main body 111 is formed in the housing 11.

The internal space C21 and the air chamber C22 are partitioned by a peripheral wall portion 112b, and are communicated with each other through a first communication hole 13 provided in the peripheral wall portion 112b. Two first communication holes 13 are formed at positions facing each other. Further, a second communication hole 14 is provided in the bottom 112a of the air chamber forming portion 112 that becomes the inner wall on the opposite side Y2 of the opening hole 112c, and the air surrounded by the peripheral wall portion 112b by the second communication hole 14 is provided. The chamber C12 and the external space in the air chamber forming part 112 are communicated with each other. A plurality of second communication holes 14 are formed.

As in the first to third embodiments, the braking material 12 is provided in the form of a sheet made of non-woven fabric, and is provided at the end of the second communication hole 14 on the air chamber C22 side. More specifically, as shown in FIG. 12, a single sheet-like braking member 12 is attached to the outer surface of the bottom 112 a of the air chamber forming portion 112 so as to cover the plurality of second communication holes 14. Yes.

In the fourth embodiment described above, the braking material 12 is provided at the end of the second communication hole 14 on the air chamber C22 side, as in the third embodiment. Thereby, the acoustic resistance in the 2nd communicating hole 14 can be enlarged, and the dip which appears in a frequency characteristic can be made small.

Further, according to the fourth embodiment, the housing 11 is formed with the opening hole 112c that penetrates the housing 11 and communicates with the external space, and the second communication hole 14 is an air chamber that is an inner wall of the opening hole 112c. It is formed on the bottom 112 a of the forming part 112. The air chamber C22 is formed on the opposite side Y2 from the opening hole 112c, and the second communication hole 14 is formed on the bottom 112a of the air chamber forming portion 112 that is the inner wall on the opposite side of the opening hole 112c. . Thereby, since the 2nd communicating hole 14 exists in the housing 11, the surrounding sound and dust cannot enter easily from the 2nd communicating hole 14. FIG.

In addition, according to the above-mentioned 4th Example, although the braking material 12 was provided in the 2nd communicating hole 14 edge by the side of the air chamber C22, it is not restricted to this. Similarly to the first embodiment, it may be provided at the end of the first communication hole 13 on the inner space C21 side. In other words, the braking material 12 may be attached to the outer surface of the peripheral wall portion 112 b of the air chamber forming portion 112 so as to cover the first communication hole 13. Further, similarly to the second embodiment, it may be provided at the end of the first communication hole 13 on the air chamber C22 side. That is, the braking material 12 may be attached to the inner side surface of the peripheral wall portion 112 b of the air chamber forming portion 112 so as to cover the first communication hole 13. Moreover, you may be provided in the 2nd communicating hole 14 edge part by the side of external space. That is, the braking material 12 may be attached to the inner surface of the bottom 112a of the air chamber forming portion 112 so as to cover the second communication hole 14.

(5th Example)
In the first to fourth embodiments described above, the headphones 1 having a headband have been described. However, the present invention is not limited to this. The headphones of the present invention include an earphone 15 as shown in FIG. As shown in the figure, the earphone 15 includes a speaker unit 16 that emits sound, a housing 17 that houses the speaker unit 16 with the sound radiation direction Y1 facing outward, and a braking member 18. The speaker unit 16 is a known speaker unit.

The housing 17 is integrally formed with a housing portion 17a for housing the speaker unit 16 and a through portion 17b through which the electric wire 19 connected to the speaker unit 16 is passed. The accommodating portion 17a is provided with a bottom portion 17c and a peripheral wall portion 17d erected from the periphery of the bottom portion 17c toward the sound emission direction Y1, and the sound emission direction Y1 side is opened. The speaker unit 16 is accommodated so as to close the opening of the accommodating portion 17a. The through portion 17b is provided so as to protrude from the bottom portion 17c of the accommodating portion 17a.

An internal space C31 is formed between the housing 17 and the speaker unit 16 described above. If it demonstrates in detail, the space in the accommodating part 17a will become the internal space C31.

In the housing 17, an air chamber C32 is formed. More specifically, a part of the peripheral wall portion 17d of the housing portion 17a is provided on a double wall composed of an inner wall portion 17e and an outer wall portion 17f, and a space sandwiched between the inner wall portion 17e and the outer wall portion 17f is defined as an air chamber C32. Become.

The internal space C31 and the air chamber C32 are communicated with each other through the first communication hole 20 provided in the inner wall portion 17e. Further, the second communication hole 21 is provided in the outer wall portion 17f, and the air chamber C32 and the external space are communicated with each other through the second communication hole 21.

The braking material 18 is provided in a sheet shape made of a nonwoven fabric, and is provided at the end of the first communication hole 20 on the inner space C31 side. More specifically, a single sheet-like braking member 18 is attached to the inner side surface of the inner wall portion 17e so as to cover the first communication hole 20.

In the fifth embodiment described above, the braking member 18 is provided at the end of the first communication hole 20 on the inner space C31 side, as in the first embodiment. Thereby, the acoustic resistance in the 1st communicating hole 20 can be enlarged, and the dip which appears in a frequency characteristic can be made small.

In addition, according to the fifth embodiment described above, the braking material 18 is provided at the end of the first communication hole 20 on the inner space C31 side, but is not limited thereto. Similarly to the second embodiment, it may be provided at the end of the first communication hole 20 on the air chamber C32 side, or the end of the second communication hole 21 on the air chamber C32 side as in the third embodiment. It may be provided in the part. Further, the second communication hole 21 on the outer space side may be provided.

In addition, according to the first to fifth embodiments described above, the nonwoven fabric is used as the

braking members

6, 12, and 18. However, the present invention is not limited to this. The

brake members

6, 12, 18 may be any material that can brake the air passing through the

first communication holes

7, 13, 20 or the second communication holes 8, 14, 21, for example, fiber or metal wire May be woven in a net shape (mesh shape).

In the above-described fifth embodiment, the ear insertion type earphone 15 is used, but the present invention is not limited to this. Canal earphones may be used.

Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Headphone 4 Speaker unit 5 Housing 6 Braking material 7 1st communicating hole 8 2nd communicating hole 10 Speaker unit 11 Housing 12 Braking material 13 1st communicating hole 14 2nd communicating hole 15 Earphone (headphone)
16 Speaker unit 17 Housing 18 Braking material 20 First communication hole 21 Second communication hole C11, C21, C31 Internal space C12, C22, C32 Air chamber Y1 Sound emission direction

Claims

A speaker unit that emits sound;
A housing that houses the speaker unit with the sound radiation direction facing outward;
An internal space formed between the housing and the speaker unit;
An air chamber formed in the housing;
A first communication hole communicating between the air chamber and the internal space;
A second communication hole communicating between the air chamber and the external space;
A headphone comprising: a braking member that brakes air passing through at least one of the first communication hole and the second communication hole.
The headphone according to claim 1, wherein the braking member is provided at an end of the first communication hole on the inner space side.
The headphone according to claim 1, wherein the braking member is provided at an end of the first communication hole on the air chamber side.
The headphone according to claim 1, wherein the braking material is provided at an end of the second communication hole on the air chamber side.
The headphones according to any one of claims 2 to 4, wherein the braking material is a non-woven fabric.
The headphone according to any one of claims 2 to 4, wherein the braking material is net-like.
The headphone according to claim 1, wherein a plurality of the first communication holes are formed.
The headphone according to claim 7, wherein a plurality of the second communication holes are formed.
The housing includes
An opening hole penetrating the housing and communicating with the external space is formed,
The headphone according to claim 1, wherein the second communication hole is formed in an inner wall of the opening hole.
The air chamber is formed on the opposite side of the sound emission direction from the opening hole,
The headphone according to claim 9, wherein the second communication hole is formed on an inner wall of the opening hole opposite to the sound radiation direction.