JP2020188370A - Ear pad and headphone - Google Patents

Abstract

To provide an ear pad for obtaining appropriate acoustic property even when a cloth material having air permeability is used for a surface skin, and also to provide a headphone including the ear pad.SOLUTION: An ear pad 3 to be used for a headphone and having flexibility at least includes: a cushioning material 35 having air permeability and constituting a core of the ear pad 3; and a cloth material having air permeability and constituting a surface skin of the ear pad 3 by enclosing the cushioning material 35. A non-air-permeable film layer is formed by a printing paint in at least a part of the cloth material.SELECTED DRAWING: Figure 4

Description

The present invention relates to an ear pad of a headphone that is worn on a user's ear and reproduces sound, and in particular, an ear pad capable of obtaining appropriate acoustic characteristics even when a breathable cloth material is used for the skin thereof, and a headphone provided with the ear pad. Regarding.

The headphones include a speaker unit, a housing that surrounds the back side of the speaker unit, and ear pads that serve as ear contact portions provided on the front side of the speaker unit. The headphones referred to here are not only those in which a pair of left and right housings are connected by a headband or the like, but also those of an earphone type in which the housing is directly supported by the user's ear, or a so-called head equipped with a microphone device in the housing or cord. Includes set.

As the material constituting the ear pad that directly touches the user, a member having flexibility so as to be pressed against the user's temporal region or ear is selected. The ear pad, which is also called an ear contact portion, includes a cushioning material that constitutes the core of the ear pad, and an epidermis material that wraps the cushioning material and constitutes the skin of the ear pad. The cushioning material and the skin material may be described by different names.

For example, conventionally, an ear pad mounted on a substrate to which a speaker unit is fixed covers an elastic body in which a plurality of elastic members having different repulsion coefficients are laminated in the sound emitting direction of the speaker unit, and an outer surface of the elastic body. Among the elastic bodies having a skin material, the first elastic member arranged on the substrate side and the second elastic member laminated and fixed on the first elastic member are donut-shaped with the same outer diameter. The ear pad is disclosed, wherein the inner diameter of the second elastic member is different from the inner diameter of the first elastic member, and the second elastic member has an inner diameter portion larger than the inner diameter of the first elastic member. Patent Document 1).

In order for the earpads to deform flexibly, the cushioning material inside must be breathable so that it can contain or expel outside air, and the material that makes up the epidermis must also be breathable, at least in part. If the material that makes up the skin of the earpad is breathable, the sound waves radiated from the diaphragm will be transmitted to the cushioning material of the earpad, which will greatly affect the acoustic characteristics such as the sound pressure frequency characteristics of the headphones. give. In addition, if the material that makes up the earpads is breathable, the airtightness cannot be maintained, and external noise will pass through the earpads and reach the ears of the user wearing the headphones. Proper design is required.

For example, ear pads used for closed headphones may be formed in a so-called donut-shaped ring shape so as to form an anterior chamber space through which sound waves radiated from a diaphragm of a speaker unit pass. In the ear pads used for conventional ear-cover type headphones, non-breathable synthetic leather that does not allow air to pass through is used so that the sound emitted from the front of the diaphragm of the speaker is not leaked while maintaining the reproduction level in the low frequency range. Although it is used as a material for the skin, there are cases where several through holes are provided in the skin inside the ear pad in order to obtain breathability as an ear pad. However, in such a case, the sponge, which is an internal cushioning material, can be seen from the holes opened inside, which is not preferable in appearance, and depending on the material of the non-breathable synthetic leather selected, the skin or There is a problem that the part that touches the earlobe feels uncomfortable, and the headphones are evaluated as uncomfortable to wear after being worn for a long time.

In addition, when improving the user's tactile sensation by using a breathable cloth material for the skin material that wraps the cushioning material, make it non-breathable by providing a film material that laminates one side of the cloth material. There is a need. However, even in that case, as in the case of the synthetic leather described above, it is necessary to ensure breathability by providing several through holes in the inner epidermis of the ear pad, which may cause the same problem.

Japanese Patent No. 6303113

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide appropriate acoustic sound for earpads and headphones, especially when a breathable cloth material is used for the skin thereof. An object of the present invention is to provide an ear pad capable of obtaining characteristics and a headphone equipped with the ear pad.

The ear pad of the present invention is a flexible ear pad used for headphones, and constitutes the skin of the ear pad by wrapping the cushioning material having breathability and forming the core of the ear pad and the cushioning material having breathability. A non-breathable coating layer is formed by a printing paint on at least a part of the cloth material.

Preferably, the earpads of the present invention are formed in a substantially annular shape that defines the anterior chamber space in which sound waves are radiated from the speaker unit of the headphones inside, and a coating film is applied to at least a part of the inner surface of the substantially annular shape. Layers are formed.

Further, preferably, in the ear pad of the present invention, a flexible and non-breathable film material is arranged between the cloth material and the cushioning material in a portion where the coating film layer of the cloth material is not formed. There is.

Preferably, the earpads of the present invention are formed in a substantially annular shape that defines the anterior chamber space in which sound waves are radiated from the speaker unit of the headphones inside, and to at least a part of the outer surface of the substantially annular shape or the human body. A film material is arranged on at least a part of the contact surface of the headphone.

Also, preferably, the headphones of the present invention include at least a speaker unit that emits sound waves, a housing that houses the speaker unit, and the ear pads that are attached to the housing.

Hereinafter, the operation of the present invention will be described.

The ear pad of the present invention is a flexible ear pad used for headphones, and comprises a cushioning material that has breathability and constitutes the core of the ear pad and a cushioning material that has breathability and wraps the cushioning material to form the skin of the ear pad. It is provided with at least a cloth material to be used. Therefore, the headphones of the present invention may be provided with a speaker unit that radiates sound waves, a housing that houses the speaker unit, and ear pads that are attached to the housing. Since a breathable cloth material is used for the skin of the ear pad, it is possible to improve the feel of the user by using, for example, a hygroscopic fabric material in the part that comes into direct contact with the user, and prevent stuffiness due to long-term wearing. can do.

In the ear pad of the present invention, a non-breathable coating film layer is formed by a printing paint on at least a part of the breathable cloth material constituting the epidermis. The coating film layer formed by the printing paint can be formed by printing a color or a pattern on all or part of the cloth material. Therefore, when printing on a part of the earpad, any part can be made non-breathable even when using a breathable fabric, and as a result, the breathability of the earpad should be properly designed. It is possible to obtain appropriate acoustic characteristics.

In addition, when the ear pads are formed in a substantially annular shape that defines the anterior chamber space in which sound waves are radiated from the speaker unit inside, so as to be suitable for closed headphones, the inner surface of the substantially annular shape is formed. The coating layer may be formed on at least a part of the above. Even when a breathable cloth material is used for the skin of the ear pad, it is possible to obtain an ear pad having a substantially annular inner surface that is non-breathable so as to be suitable for closed headphones.

Further, in the portion where the coating film layer of the cloth material is not formed, a flexible and non-breathable film material may be arranged between the cloth material and the cushioning material to make it non-breathable. it can. Therefore, any part of the ear pad can be made non-breathable even in the other non-printed portion, and the breathability of the ear pad can be appropriately designed. In particular, when the anterior chamber space from which sound waves are radiated from the speaker unit is formed in a substantially annular shape that defines the inside thereof so as to be suitable for closed headphones, at least one of the outer surfaces of the substantially annular shape is formed. The film material may be arranged on at least a part of the contact surface with the part or the human body.

The headphones provided with the ear pads of the present invention do not have through holes as in the case of the epidermis of non-breathable synthetic leather, so that they are comfortable to the touch and comfortable to wear, have appropriate acoustic characteristics, and are excellent in reproduced sound quality. Become a thing. Further, the coating film layer of the cloth material can be formed by printing a color or a pattern on all or a part of the skin of the ear pad. Therefore, the appearance of the ear pad can be decorated with the color or pattern of printing, and headphones having an excellent design and design can be realized.

Even when a breathable cloth material is used for the skin of the earpad-arranged headphones of the present invention, the earpads are comfortable to the touch and comfortable to wear, and appropriate acoustic characteristics can be obtained.

It is external drawing of the headphone which concerns on one Embodiment of this invention. It is explanatory drawing which showed the specific structure of the headphone which concerns on one Embodiment of this invention. It is explanatory drawing which showed the specific structure of the ear pad which concerns on one Embodiment of this invention. It is sectional drawing which showed the concrete structure of the ear pad which concerns on one Embodiment of this invention. It is a graph which shows the sound pressure frequency characteristic of the headphone which concerns on one Embodiment of this invention.

Hereinafter, earpad-arranged headphones according to a preferred embodiment of the present invention will be described, but the present invention is not limited to these embodiments.

1 and 2 are views for explaining the headphone 1 according to the preferred embodiment of the present invention. Specifically, FIG. 1 is a perspective view showing the appearance of the headphone 1, and FIG. 2 is a developed view showing a specific structure of the headphone unit 1A and the ear pad 3. Although the headphone 1 of this embodiment is in the form of a headset including the microphone 4, it is not limited to the case of this embodiment. Illustration and description of other headphone 1 configurations that are not necessary for the description of the present invention will be omitted.

The headphone 1 of this embodiment includes left and right headphone units 1A and 1B, and a headband 1C connecting these headphone units 1A and 1B. The headphone units 1A and 1B each include a housing 2 for accommodating the speaker unit and an ear pad 3. The headband 1C is connected to each connecting portion with the hanger 1D, and the hangers 1D and 1D are connected to the housings 2 and 2, respectively.

The headphone unit 1A on one side of the headphone 1 includes a speaker unit 10, a housing 2 that surrounds at least the back side of the speaker unit 10, and an ear pad 3 provided on the front side of the speaker unit 10. The headphone unit 1B on the other side has the same configuration as the headphone unit 1. However, the microphone 4 is attached to the tip end side of the arm portion to which the root portion is attached to the headphone unit 1B.

The speaker unit 10 includes a diaphragm (not shown), a voice coil connected to the diaphragm (not shown), a magnetic circuit having a magnetic gap (not shown) in which the voice coil is arranged, and an outer peripheral portion of the diaphragm. A frame (not shown) is provided, and the frame is attached to a connecting member 22 provided with an opening 22C of the housing 2. The frame is defined with a plurality of openings through which sound waves radiated from the diaphragm pass to the internal space 2S side (not shown later), and is formed of a breathable material so as to cover these openings. A braking member (not shown) is attached. The configuration of the speaker unit 10 is not limited to this, and various other well-known forms can be adopted.

The housing 2 includes a connecting member 22 to which the frame of the speaker unit 10 is connected, and a housing member 21 that surrounds the back side of the speaker unit 10 and defines the internal space 2S. The housing member 21 of the housing 2 is provided with a plurality of holes 2a (not shown) on its side, and the holes 2a allow the internal space 2S of the housing 2 to be connected to the outside of the housing 2 on the outside of the ear pads 3. Communicating. In the headphone 1, the compliance (acoustic capacity) due to the internal space of the housing 2 can be adjusted by the hole 2a, and the frequency characteristic, particularly the frequency characteristic in the low frequency range can be adjusted by adjusting the compliance.

The connecting member 22 of the housing 2 includes a protective portion 22B facing the acoustic radiation surface of the speaker unit 10, an opening 22C where the diaphragm of the speaker unit 10 is exposed, and an ear pad mounting portion 22E to which the ear pad 3 is attached. ing. The ear pad 3 is attached to the connecting member 22 of the housing 2 on the acoustic radiation side of the speaker unit 10. The ear pad mounting portion 22E is a flange portion formed at the outer peripheral end portion of the substantially ring-shaped connecting member 22, and the mounting bracket 38 (described later) of the ear pad 3 is engaged with the ear pad mounting portion 22E.

The ear pad 3 is formed in a substantially annular shape that defines the anterior chamber space S1 in which sound waves are radiated from the speaker unit 10 inside. The ear pads 3 include a breathable protective cloth 30 that covers the opening 22C of the connecting member 22 of the housing 2 where the diaphragm of the speaker unit 10 is exposed, a substantially annular inner surface 31, and the user's temporal region or the ear pad 3. It includes a contact surface 32 that comes into contact with the ear, an outer surface 33 that is exposed to the outside S2, and a mounting surface 34 that faces the connecting member 22 of the housing 2.

The ear pad 3 divides the outside of the housing 2 into a space inside the ear pad 3 (anterior chamber space S1) and an outside S2 outside the ear pad 3 by contacting the user's temporal region or ear. The anterior chamber space S1 of the housing 2 inside the ear pad 3 is a space communicating with the inside of the listener's ear. The outer S2 of the housing 2 on the outside of the ear pad 3 is separated from the space in the ear by the ear pad 3.

In the headphone unit 1A, the internal space 2S (not shown) of the housing 2 communicates with the front chamber space S1 of the housing 2 inside the ear pads 3. Specifically, the internal space 2S is configured to include a housing member 21 constituting the housing 2 and a connecting member 22 to which the speaker unit 10 is connected. The internal space 2S of the housing 2 communicates with the front chamber space S1 of the housing 2 inside the ear pad 3 via the opening 22D provided in the connecting member 22 of the housing 2. A braking member (not shown) formed of a breathable material is attached to the opening 22D of the housing 2 of this embodiment so as to cover the opening 22D.

Since the sound wave radiated from the diaphragm of the speaker unit 10 and the sound wave passing through the internal space 2S of the housing 2 pass through the anterior chamber space S1 defined by the ear pad 3, the member constituting the ear pad 3 is a headphone. It has a great influence on the acoustic characteristics such as the sound pressure frequency characteristic of 1. Although the headphones 1 of this embodiment have a plurality of holes 2a in the housing 2, they are substantially sealed, so that it is necessary to appropriately design the airtightness and breathability of the ear pads 3.

3 and 4 are explanatory views showing a specific structure of the ear pad 3. FIG. 3 is a perspective view of a black-and-white photograph showing the appearance, and FIG. 4 is a schematic view illustrating a cross section taken along the line AA in FIG. The ear pad 3 has breathability, a cushioning material 35 which is an annular elastic member forming the core of the ear pad 3, and a cloth material which is a covering member which wraps the cushioning material 35 so as to cover the skin of the ear pad 3. The protective cloth 30 attached so as to cover the speaker unit 10 and the attachment bracket 38 are included.

As the cushioning material 35, a low-resilience urethane member or a cooling sensation gel member is used so that the core of the ear pad 3 can be formed with flexibility and breathability. The cushioning material 35 is formed into a donut shape (annular ring) that serves as the core of the ear pad 3, and its cross section has a substantially rectangular shape with rounded corners. Therefore, in the ear pad 3, the inner surface 31 having a substantially annular shape, the contact surface 32 in contact with the user's temporal region or ear, the outer surface 33 exposed to the outer S2, and the connecting member 22 of the housing 2 face each other. The cushioning material 35 is covered with a covering member constituting the skin so as to form the mounting surface 34 to be formed.

The covering member constituting the skin of the ear pad 3 is formed by sewing a plurality of flexible cloth materials and synthetic leather materials with suture threads 37. As the covering member constituting the epidermis of this embodiment, a cloth material having flexibility and breathability is mainly used for the part touching the user's temporal region or ear so as to be comfortable to the touch and comfortable to wear. ing. The cloth material is, for example, a fabric material woven with threads made of polyester composite fiber, has flexibility and breathability, and is soft to the touch. In the ear pad 3 of this embodiment, a flexible and breathable cloth material is used as a covering member on the inner side surface 31, the contact surface 32, and the outer surface 33.

A non-breathable coating film layer made of a printing paint is formed on a part of the inner surface 31 of the ear pad 3 of the present embodiment in which a flexible and breathable cloth material is used. In the black-and-white photograph of FIG. 3, the black portion 31a of the inner side surface 31 of the ear pad 3 is a portion where the purple-dyed cloth material is exposed. Further, the white portion 31b of the inner side surface 31 of the ear pad 3 is a portion where a non-breathable coating film layer is formed by the fluorescent yellow printing paint.

Therefore, as shown in FIG. 4, in the portion 31a where the cloth material on the inner side surface 31 is exposed, the air permeability of the cloth material is maintained so that the air X can pass through. On the other hand, in the portion 31b on the inner side surface 31 where the coating film layer is formed, the breathable cloth material is sealed by the coating film layer of the printing paint, so that air X does not pass through and the portion 31b becomes non-breathable.

The coating film layer on the inner side surface 31 is formed by drawing a pattern (pattern, pattern, mark, etc.) including shading on the surface of the cloth material with a fluorescent yellow printing paint. In the dark part, the thickness of the coating film layer is thick, and the amount of air permeability per unit area is smaller than that in the case where there is no coating film layer. Further, the light-colored portion has a thinner coating film layer than the dark-colored portion, and the air permeability per unit area is larger than that of the dark-colored portion. As described above, in the ear pad 3 of the present embodiment, the breathability of the cloth material constituting the inner side surface 31 is changed by printing colors and patterns and changing the ratio of the area occupied by the non-breathable coating layer. Can be adjusted.

As the contact surface 32 and the outer surface 33 of the ear pad 3, a cloth material having flexibility and breathability is used as in the inner surface 31. However, a non-breathable coating film layer made of printing paint is not formed on a part of the surface. A flexible and non-breathable film material 36 is arranged between the abutting surface 32 and the outer surface 33 as a cloth material with the cushioning material 35. In the case of this embodiment, the film material 36 is a non-breathable layer formed by coating with a polyurethane resin so as to cover the back side of the cloth material. As the film material 36, another non-breathable laminating material such as a polyurethane film may be attached to the cloth material.

On the other hand, in the ear pad 3 of this embodiment, a synthetic leather material made of a polyurethane material is used for the mounting surface 34 facing the connecting member 22 of the housing 2. Synthetic leather is flexible but not breathable. Since the mounting surface 34 is not a portion that comes into direct contact with the user, a non-breathable synthetic leather material may be used. The protective cloth 30 breathable by the suture thread 37 and the mounting bracket 38 molded of resin are sewn to the mounting surface 34 made of synthetic leather.

In the ear pad 3 of the present embodiment, while using a breathable cloth material for the portion that comes into direct contact with the user, the skin of the portion other than the inner side surface 31 is made non-breathable so as to be suitable for closed headphones. There is. Further, a non-breathable coating film layer made of a printing paint is formed on a part 31b of the surface of the inner side surface 31. On the other hand, since the non-breathable coating film layer by the printing paint is not formed on a part 31a of the surface of the inner side surface 31, the ear pad 3 can secure flexibility and breathability.

FIG. 5 is a graph showing the sound pressure frequency characteristics of the headphones 1 of this embodiment. Specifically, the case of the headphone 1 provided with the ear pad 3 of this embodiment, the case of the headphone 1a provided with the ear pad 3a (not shown) of another embodiment (not shown), and another (not shown) as a comparative example. It is a graph of the sound pressure frequency characteristic overwritten with the case of the headphone 100 provided with the ear pad 300 (not shown). In the graph, the horizontal axis is the frequency, and the vertical axis is the sound pressure level in the space inside the ear pad 3 (anterior chamber space S1).

These headphones 1, 1a or 100 are common headphones except that the ear pads 3, 3a or 300 have different configurations. Therefore, the graph of FIG. 5 shows the influence of the ear pad 3 on the sound pressure frequency characteristic. Further, the description of the configuration of other headphones common to the headphones 1 of this embodiment will be omitted.

In the ear pads 3a (not shown) of another embodiment, the area of the non-breathable coating film layer formed by the printing paint on the inner side surface 31 is relatively wider than that of the ear pads 3 of this embodiment. That is, in the ear pad 3a, the area of the portion where the coating film layer is not formed on the inner side surface 31 is smaller than that of the ear pad 3, and the air permeability is deteriorated. Further, in the ear pad 300 (not shown) of the comparative example, the skin of the inner side surface 31 is made of non-breathable synthetic leather. Therefore, the ear pad 300 is almost non-breathable.

In the case of the headphone 1 provided with the ear pad 3 of the present embodiment, since the inner side surface 31 of the ear pad 3 has good ventilation, the space inside the ear pad 3 (anterior chamber space S1) is substantially compared to other cases. Become wider. Therefore, it is possible to prevent a dip from occurring in the sound pressure frequency characteristic in the band around 400 Hz to 2 kHz as seen in the case of the other ear pad 3a or the ear pad 300, and it is possible to realize an appropriate sound pressure frequency characteristic. In the case of the headphone 1 of the present embodiment, the sound pressure level in the mid-low range is lowered and the sound pressure level in the mid-high range is raised as compared with the case of the headphone 100 of the comparative example. As a result of the comparative audition, it can be confirmed that the reproduced sound quality of the headphone 1 is superior to that of the headphone 100.

However, as can be seen from the results of the ear pads 3a (not shown) of another embodiment, the area of the non-breathable coating film layer on the inner surface 31 can be adjusted by the area of the pattern by the printing paint, so that the inner surface can be adjusted. The air permeability of 31 can be adjusted in a wide range. Therefore, in the ear pads 3 or 3a, the breathability of the cloth material forming the inner side surface 31 can be adjusted by printing colors, patterns, and the like.

Further, the ear pad 3 of this embodiment is comfortable to the touch because the breathability can be ensured by the cloth material of the non-printed portion without providing a through hole as in the case of the skin of non-breathable synthetic leather. The fit is improved. In the ear pad 3 of this embodiment, it is not necessary to provide several through holes in the inner epidermis as in the conventional ear pad.

Therefore, in the ear pad 3, the sponge, which is an internal cushioning material, is not visible through the through hole opened in the epidermis, and the appearance is not spoiled. Rather, in the ear pad 3 of the present embodiment, a non-breathable coating film layer is formed as a color and a pattern on the inner side surface 31 by the printing paint, so that the headphone 1 having an excellent aesthetic design can be realized.

In the ear pad 3 of this embodiment, the pattern of the non-breathable coating film layer is provided only on the inner side surface 31 of the epidermis. However, the other contact surface 32 and the outer surface 33 of the ear pad 3, and also the skin of the mounting surface 34 may be provided with a pattern by the coating film layer. Headphones 1 with an aesthetically pleasing design can be realized.

Further, in the ear pad 3, the covering member constituting the skin of the ear pad 3 is formed by sewing a plurality of flexible cloth materials and synthetic leather materials with suture threads 37, but at least a part thereof is ventilated. It suffices that a cloth material having properties is used, and a non-breathable coating layer is formed on the cloth material by a printing paint.

Further, in the ear pad 3, the covering member constituting the skin of the ear pad 3 is formed by sewing a plurality of flexible cloth materials and synthetic leather materials with suture threads 37, but at least a part thereof is ventilated. It suffices that a cloth material having properties is used, and a non-breathable coating layer is formed on the cloth material by a printing paint. The cushioning material 35 may have a substantially circular cross section rather than a substantially rectangular shape with rounded corners. Even in that case, the inner surface 31 of the ear pad 3 may be a surface that defines the anterior chamber space S1 in which sound waves are radiated from the speaker unit 10 inside.

Note that in FIG. 1, the cord and plug portion of the headphones 1 corresponding to stereo reproduction are not shown. The headphone 1 may be a wireless headphone including a receiving unit for receiving a radio signal without a cord for supplying an audio signal and a plug unit.

The headphones of the present invention are not limited to the overhead type headphones as shown in the figure, and may be headphones having another ear hook portion. Moreover, it can be applied not only to headphones but also to earphones and the like. Further, the headphones and earphones of the present invention are not limited to stereo playback for home use or multi-channel surround playback, but are also applicable to gaming headphones for game equipment, in-vehicle audio equipment, and sound reproduction equipment such as movie theaters. Is possible.

1 Headphones 2 Housing 3 Earpads 10 Speaker unit 30 Protective cloth 31 Inner side surface 32 Contact surface 33 Outer side surface 34 Mounting surface 35 Cushioning material

Claims (5)

A flexible ear pad used for headphones
At least a cushioning material that has breathability and constitutes the core of the ear pad and a cloth material that has breathability and wraps the cushioning material to form the skin of the ear pad are provided.
A non-breathable coating film layer is formed on at least a part of the cloth material by a printing paint.
Ear pad. The anterior chamber space in which sound waves are radiated from the speaker unit of the headphones is formed in a substantially annular shape that defines the inside thereof.
The coating film layer is formed on at least a part of the inner surface of the substantially annular shape.
The ear pad according to claim 1. A flexible and non-breathable film material is arranged between the cloth material and the cushioning material in a portion of the cloth material in which the coating film layer is not formed.
The ear pad according to claim 1 or 2. The anterior chamber space in which sound waves are radiated from the speaker unit of the headphones is formed in a substantially annular shape that defines the inside thereof.
The film material is arranged on at least a part of the outer surface of the substantially annular shape or at least a part of the contact surface with the human body.
The ear pad according to claim 3. A speaker unit that emits sound waves, a housing that houses the speaker unit, and the ear pads according to any one of claims 1 to 4 that are attached to the housing are provided at least.
headphone.