JP6754075B2 - earphone - Google Patents

Description

The present invention relates to an earphone that is attached to a user's ear and reproduces sound, and particularly to an earphone in which an outlet of a sound wave to be reproduced is inserted into the entrance of the user's ear canal.

The headphones and earphones reproduce sound by applying an audio signal to a speaker unit that is arranged close to the user's ear. There are various forms of earphones worn on the user's ear.

For example, some earphones are provided with a relatively large speaker unit such as headphones, and are provided with an ear hook that is attached so that the main body is placed on the pinna. In addition, there is an inner ear type that is used by mounting the main body so as to fit inside the auricle and emitting sound from the sound emitting surface of the main body toward the ear canal. In addition, there is a type of earphone called a canal type that is used by inserting the main body so that it fits inside the auricle, and then inserting the sound tube that protrudes from the main body into the ear canal together with the earpiece attached to it. It is widespread.

The smaller the speaker unit, the more difficult it is to obtain a high sound pressure level and sufficiently widen the audio reproduction frequency band to ensure good reproduction sound quality. Similar problems occur with speaker units in earbud or canal earphones that are worn on the user's ear. In particular, for canal-type earphones in which the outlet of the sound wave to be reproduced is inserted into the entrance of the user's ear canal, it is recommended to use a speaker unit with a small housing for attaching the speaker unit and a large diaphragm diameter that has the necessary and sufficient sound reproduction capability. There is a problem that it is difficult and easily affected by the structure of the housing.

In a conventional earphone housing, an opening, a hole, an acoustic passage, a leak port, or the like that communicates the internal space and the external space of the housing may be provided. In particular, there is a case in which a relatively long acoustic passage communicating from the internal space corresponding to the back side of the speaker unit of the housing to the external space is provided (Patent Documents 1 and 2).

Further, conventionally, a housing in which an acoustic space is formed inside and a tubular sound guiding portion is projected on the front surface, an ear pad attached to the sound guiding portion and inserted into the external auditory canal, and the first communication. A frame having pores and provided in the housing to separate the acoustic space into a first acoustic space and a second acoustic space, and a frame attached to the frame to convert an electric signal into a first sound wave to guide the sound. The sound pressure adjusting unit includes an electric sound wave conversion unit that outputs to the sound unit and a sound pressure adjusting unit attached to the frame, and the sound pressure adjusting unit has a third acoustic space communicating with the first ventilation hole and the second acoustic space. A tubular second vent that communicates with the acoustic space and the third acoustic space, and a first acoustic resistor that is inserted into the second vent and reduces the sound pressure in a predetermined frequency band by adjusting the insertion position. There is a canal type earphone characterized by having and (Patent Document 3).

However, further improvement is desired for conventional earphones. In particular, in a canal type earphone in which the outlet of the sound wave to be reproduced is inserted into the entrance of the user's ear canal, the structure of the housing forming an extremely small internal space affects the sound pressure frequency characteristics of the sound wave to be reproduced. There is a problem that it is difficult to realize natural and preferable sound reproduction unless the sound is clearly heard.

Jikkai Sho 63-95388 Japanese Unexamined Patent Publication No. 2015-195444 Japanese Patent No. 5696249

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 attach a speaker unit to a canal type earphone in which the outlet of the sound wave to be reproduced is inserted into the entrance of the user's ear canal. An object of the present invention is to provide an earphone that realizes clear and preferable sound reproduction by configuring a housing that obtains an appropriate sound pressure frequency characteristic in such a case.

In the earphone of the present invention, a speaker unit that converts an audio signal into sound waves and a speaker unit are attached inside the speaker unit, and a first acoustic space and a second acoustic are provided on one side and the other side of the speaker unit's vibrating plate, respectively. An earphone including a housing that defines a space, wherein the housing communicates with a nozzle portion that communicates with a first acoustic space and forms a first acoustic passage that guides sound waves to a user's external auditory canal, and communicates with a second acoustic space. A leak port portion for forming a second acoustic passage for guiding sound waves to an external space is provided, and the leak port portion bends the tubular material having flexibility constituting the second acoustic passage and the tubular material . It also has a fixing portion that is fixed along the inner wall portion of the housing or the outer wall portion of the housing that constitutes the second acoustic space.

Preferably, in the earphone of the present invention, the leak port portion spirally winds a tubular material to form a second acoustic passage.

Further, preferably, in the earphone of the present invention, the fixing portion of the leak port portion is provided on the inner wall portion and / or the outer wall portion of the housing constituting the second acoustic space, and a groove or a cover member for accommodating the tubular material is provided. Including.

Further, preferably, in the earphone of the present invention, the opening area of the opening end portion communicating with the second acoustic space or the external space of the second acoustic passage of the leak port portion is larger than the cross-sectional area at the intermediate portion thereof. It is formed like this.

Further, preferably, the earphone of the present invention further includes a protective member having a breathable opening end portion in which the tubular material of the leak port portion communicates with the second acoustic space or the external space.

Further, preferably, the earphone of the present invention further includes a cord connection portion in which the housing connects a cord for supplying an audio signal to the speaker unit.

Further, preferably, the earphone of the present invention includes an earpiece mounting portion for attaching the earpiece to be inserted into the user's ear canal at the tip of the nozzle portion, and further includes an earpiece to be attached to the earpiece mounting portion.

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

In the earphone of the present invention, a speaker unit that converts an audio signal into sound waves and a speaker unit are attached inside the speaker unit, and a first acoustic space and a second acoustic are provided on one side and the other side of the diaphragm of the speaker unit, respectively. It includes a housing that defines the space. The housing includes a nozzle portion that communicates with the first acoustic space and forms a first acoustic passage that guides sound waves to the user's ear canal. Therefore, if the housing further comprises a cord connection for connecting a cord that supplies an audio signal to the speaker unit, and the nozzle of the housing further has an earpiece attachment for attaching an earpiece that is inserted into the user's ear canal. , It is possible to realize a canal type earphone in which the earpiece is in close contact with the ear canal.

The housing of the earphone includes a leak port portion that communicates with the second acoustic space and forms a second acoustic passage that guides sound waves to the external space. The leak port portion is fixed along the flexible tubular material constituting the second acoustic passage and the inner wall portion of the housing or the outer wall portion of the housing constituting the second acoustic space without bending the tubular material. It has a fixed portion and. Since the tubular material, which is a hollow tubular member, has flexibility, the fixing portion shapes the tubular material into a predetermined shape and fixes it to the housing.

Therefore, in canal-type earphones, a flexible tubular material accompanies the housing even when a thin, long-sized second acoustic passage must be formed to obtain proper sound pressure frequency characteristics. Since the leak port portion does not protrude significantly from the housing, the entire housing can be miniaturized. As a result, natural and preferable audio reproduction can be realized.

Preferably, in the earphone of the present invention, the leak port portion of the housing spirally winds a tubular material to form a second acoustic passage. When the tubular material is wound in a spiral shape, a second acoustic passage having a dimension longer than the dimension corresponding to the circumference of the substantially circular housing can be formed, so that in a relatively low frequency band. However, there is an advantage that the resonance frequency can be adjusted, the audio reproduction frequency band can be sufficiently widened, and good reproduction sound quality can be ensured.

Further, in the earphone of the present invention, preferably, the fixing portion of the leak port portion is provided on the inner wall portion and / or the outer wall portion of the housing constituting the second acoustic space, and a groove or a cover member for accommodating the tubular material is provided. Including. Fixing portion providing grooves for fitting the tubular material to the inner wall portion and the outer wall of the housing, or by forming a fixing portion for fixing the tubular member with a cover member, a predetermined substantially arcuate without bending the tubular member Can be shaped into a housing and fixed to the housing. As a result, it is possible to prevent a problem that the second acoustic passage is closed or narrowed when the tubular material forming the leak port portion is bent. When the tubular material is fixed to the outer wall of the housing with the cover member, the cover member can be given a design and an earphone having an excellent appearance can be realized.

Further, the second acoustic passage of the leak port portion may be formed so that the opening area of the opening end portion communicating with the second acoustic space or the external space is larger than the cross-sectional area at the intermediate portion thereof. For example, if the opening end of the tubular material forming the leak port portion is cut diagonally to form an elliptical opening, the opening area can be made larger than the cross-sectional area at the intermediate portion, and the leak can be made. The operation and effect as a port can be enhanced. When the tubular material of the leak port portion further includes a protective member having air permeability at the opening end portion communicating with the second acoustic space or the external space, foreign matter is mixed into the inside of the tubular material from the opening end portion. Therefore, it is possible to prevent problems such as the second acoustic passage being closed or narrowed.

The earphone of the present invention can provide a canal type earphone that realizes clear and preferable sound reproduction by configuring a housing including a leak port portion that obtains an appropriate sound pressure frequency characteristic when a speaker unit is attached. ..

It is a figure explaining the earphone by a preferable embodiment of this invention. (Example 1) It is a figure explaining the internal structure of the earphone by a preferable embodiment of this invention. (Example 1) It is a graph explaining the sound pressure frequency characteristic of the earphone by a preferable embodiment of this invention.

Hereinafter, earphones according to preferred embodiments 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 earphone 1 according to the preferred embodiment of the present invention. Specifically, FIG. 1 shows a perspective view of the earphone 1 worn on one ear of the user, and the cover 8 fixed to the housing member 12 so as to hide a part of the leak port 7 described later is removed. It is illustrated in.

Further, FIG. 2 is a cross-sectional view illustrating the internal structure of the earphone 1. FIG. 2A is a cross-sectional view taken along the line AA'of FIG. 1, and FIG. 2B shows only the leak port 7 corresponding to the cross section B-B'in FIG. 2A. 2 (c) is a cross-sectional view taken along the line CC'of the leak port 7 in FIG. 2 (b). The illustration and description of other earphone 1 configurations that are not necessary for the description of the present invention will be omitted.

The earphone 1 of this embodiment is a canal type earphone in which the outlet of the sound wave to be reproduced is inserted into the ear canal hole of the user's auricle. The earphone 1 is provided with earphones having a substantially symmetrical shape to be worn on the left and right ears of the user, and can support stereo reproduction. Hereinafter, a configuration corresponding to one ear of the earphone 1 will be described. Of course, the form of the earphone 1 is not limited to the case of this embodiment.

The earphone 1 is provided with a speaker unit 3 that reproduces sound by supplying an audio signal via a cord 5 to the housing 2. The speaker unit 3 is an electro-acoustic converter that includes a magnetic circuit having a magnetic gap and vibrates a diaphragm that is inserted into the magnetic gap and connected to a voice coil to which a voice signal is supplied. The speaker unit 3 radiates sound waves having an opposite phase relationship to the front side and the back side of the diaphragm (not shown). Therefore, it is necessary to attach the speaker unit 3 to the housing 2 so as to separate one side and the other side of the diaphragm of the speaker unit 3.

The housing 2 of this embodiment can be fitted with a speaker unit 3 having a diameter corresponding to the size of the ear canal hole of the user's pinna. The housing 2 includes a substantially cylindrical base member 11 including a nozzle portion, and a housing member 12 connected to the rear side of the base member 11 to form a cavity. The base member 11 and the housing member 12 of the housing 2 define an acoustic space 17 on the front side of the diaphragm of the speaker unit 3, and the acoustic space 17 is separated from the acoustic space 17 on the rear side where the magnetic circuit of the speaker unit 3 exists. The space 18 is formed.

The base member 11 is made of a metal material or a resin material, and includes a speaker unit mounting portion for mounting the speaker unit 3 on an inner wall portion. The outer diameter frame of the speaker unit 3 has an outer diameter that substantially matches the inner diameter of the speaker unit mounting portion of the substantially cylindrical base member 11. The base member 11 includes a nozzle portion formed so that the tip side is thinner than the speaker unit mounting portion so as to be inserted into the external auditory canal hole of the user's pinna. The nozzle portion forms an acoustic passage on the inner side thereof that communicates with the acoustic space 17 and guides sound waves to the user's ear canal.

An earpiece mounting portion for mounting the earpiece 6 is formed on the outer peripheral surface of the nozzle portion of the base member 11. If the cap-shaped earpiece 6 having elasticity is attached, a canal type earphone in which the earpiece 6 is in close contact with the ear canal hole can be realized. The earpiece 6 allows the user to stably wear the earphone 1 on the pinna. A protective net 14 as a protective member having air permeability is attached to the open end of the nozzle portion. The protective net 14 prevents problems such as foreign matter entering from the opening end of the nozzle portion and closing the acoustic passage. Further, the base member 11 may include a leak hole or a port (not shown) that communicates with the acoustic space 17 and guides a sound wave to an external space.

On the other hand, the housing member 12 is made of a metal material or a resin material, and a cord bush 4 for fixing a cord 5 for supplying an audio signal to the speaker unit 3 is connected. The cord bush 4 is made of a flexible rubber material so as to include the cord 5 inside, and one side thereof is attached to a mounting hole of the housing member 12. In the case of the earphone 1 in which the housing 2 is provided with a jack for connecting a plug, the housing member 12 is provided with a cord 5 instead of the cord bush 4 as a cord connecting portion for connecting the cord 5 for supplying an audio signal to the speaker unit 3. It may have a jack into which the plug at the tip of the headphone is inserted.

The housing member 12 defines an acoustic space 18 formed separately from the acoustic space 17, and further includes a leak port 7 that communicates with the acoustic space 18 and forms an acoustic passage for guiding sound waves to an external space. The leak port 7 constitutes an acoustic passage by using a tube having an outer diameter of 2.0 mm, an inner diameter of 1.0 mm, and a length of about 40.0 mm, which is a hollow tubular material made of a flexible silicone resin. As shown in the figure, in the leak port 7, the opening end portion 7a communicating with the acoustic space 18 is arranged inside the housing member 12, and the opening end portion 7c communicating with the external space is arranged outside the housing member 12.

The length and inner diameter of the tube of the leak port 7 are preferably adjusted according to the volume of the air chamber of the acoustic space 18. Further, the leak port 7 may be a hollow tubular material having flexibility to obtain a required inner diameter dimension, and the material is not limited to silicone resin. The leak port 7 may be other than a silicone resin, and may be, for example, a rubber-based material, an elastomer resin material, or a PVC (polyvinyl chloride) resin material.

That is, as shown in FIG. 2B, the spirally wound leak port 7 passes through the hole of the housing member 12 and both ends thereof appear inside and outside the housing 2. .. In the leak port 7, the opening ends 7a and 7c are formed so that the opening area thereof becomes larger than the cross-sectional area at the intermediate portion 7b by cutting the tubular material diagonally. A protective net 15 as a protective member having air permeability is attached to the open end portion 7c of the leak port 7. The protective net 15 prevents problems such as foreign matter entering the inside from the open end of the leak port 7 and closing the acoustic passage.

In the canal type earphone 1, in order to obtain an appropriate sound pressure frequency characteristic, a leak port 7 which is a thin and long-sized acoustic passage must be formed. Since the leak port 7 is a member that is extremely thin and long compared to the dimensions of the housing 2, it requires special ingenuity to attach it to the housing 2. In order to accommodate the long leak port 7 in the housing 2 as in the case of this embodiment, it is necessary to shape the long leak port 7 into a predetermined shape without providing a bent portion. This is because if a bent portion is formed in which the tube is sharply bent, the inside of the tubular material is closed or the area inside is remarkably narrowed, so that the tube does not function as an acoustic passage.

The housing member 12 has a fixing portion 16 that is fixed along the inner wall portion and the outer wall portion of the housing member 12 that constitutes the acoustic space 18 without bending the leak port 7. A fixing portion 16a as a groove into which the leak port 7 is fitted is formed in the inner wall portion of the housing member 12. Similarly, the outer wall portion of the housing member 12 is formed with a fixing portion 16b as a groove along which the leak port 7 is formed. The fixing portion 16a and the fixing portion 16b are configured to communicate with each other by a hole penetrating the housing member 12. In order to fix the leak port 7 to the fixing portion 16, an adhesive or an adhesive material such as double-sided tape may be used.

Therefore, as shown in FIGS. 1 and 2, since the leak port 7, which is a hollow tubular member, has flexibility, it is shaped into a predetermined substantially arc-shaped shape without being bent by the fixing portion 16. , Fixed to the housing member 12. At the same time, one end of the tubular leak port 7 is exposed to the outer wall portion of the housing member 12. However, since the leak port 7 is fixed along the housing member 12, the entire housing 2 of the earphone 1 can be miniaturized without significantly protruding from the housing 2.

The fixing portion 16 for fixing the leak port 7 can be used not only as a groove for accommodating the tubular leak port 7 but also another fixing member. In the case of this embodiment, it is attached to the outer wall portion of the housing member 12 to cover and fix the leak port 7, and a cover 8 is further provided to hide the hole portion where the leak port 7 comes out to the outside. There is. Of course, a cover that covers and fixes the leak port 7 may be provided on the outer wall portion of the housing member 12. It is possible to give the cover 8 a design and improve the appearance of the earphone 1.

FIG. 3 is a graph for explaining the sound pressure frequency characteristics of the earphone 1 of this embodiment and the earphone 10 of the comparative example. The horizontal axis represents the frequency of the input audio signal, and the vertical axis represents the ear which is a measuring jig. Shows the sound pressure level in the ear canal when attached to the mold. The earphone 10 (not shown) of the comparative example is a case where the housing 2 of the earphone 1 of the present embodiment does not include the leak port 7 which communicates with the acoustic space 18 and forms an acoustic passage for guiding the sound wave to the external space. .. The speaker unit 3 is common. Therefore, FIG. 3 shows the action and effect of the leak port 7 in the canal type earphone 1.

As shown in FIG. 3, the sound pressure frequency characteristic of the earphone changes greatly depending on the presence or absence of the leak port 7. Compared with the earphone 10 of the comparative example, the earphone 1 of the present embodiment is improved so that the characteristic is approximately flat at about 300 Hz to 1 kHz. As a result, the intelligibility of the reproduced sound can be improved. As the canal type earphone 1 in which the outlet of the sound wave to be reproduced is inserted into the entrance of the user's ear canal, it is possible to realize natural and preferable voice reproduction as compared with the earphone 10 of the comparative example.

Here, it is preferable that the leak port 7 is formed by spirally winding a thin tubular material to form an acoustic passage. This is because it is appropriate that the length of the leak port 7 is at least longer than the dimension corresponding to the peripheral length of the substantially circular housing 2. When the leak port 7 is shortened, the sound pressure around 300 Hz does not decrease as in the case of the above embodiment, so that the clarity of the reproduced sound is lowered and the reproduced sound quality is deteriorated.

In the canal type earphone 1, a leak port 7 in which a thin tubular material as described above is spirally wound to form an acoustic passage is preferable, but on the other hand, a leak port having the same thinness / length is preferable. When 7 is applied to other conventional non-canal type earphones, the same effect cannot be obtained. In that case, there arises a problem that the sound pressure level in the low frequency range becomes high, the intelligibility becomes low, and the voice reproduction frequency band becomes narrow. As a result, it becomes difficult for such earphones to ensure good reproduction sound quality.

In order to accommodate the leak port 7, which is relatively long compared to the size of the housing 2 of the earphone 1, in the housing 2, it is necessary to shape the leak port 7 into a predetermined shape without providing a bent portion as in the present embodiment. .. On top of that, if necessary, the long tubular leak port 7 may be shaped so as to be spirally wound so as to be wound by overlapping at least one rotation. Even if the leakage port 7 can be accommodated in one rotation or less, if the fixing portion 16 is provided so as to spirally wind the leak port 7, the inner wall portion of the housing member 12 constituting the acoustic space 18 and / Alternatively, it can be fixed along the outer wall portion.

When the leak port 7 is relatively short, or when the leak port 7 is shaped so as to be spirally wound on the inner side of the housing member 12, it comes out to the outside of the housing member 12 of the leak port 7. When the length of the portion is shortened and is the shortest, the opening end portion 7c on the outer space side of the leak port 7 may only appear on the outer wall portion of the housing member 12. Therefore, the fixing portion 16 of the housing member 12 may be provided at least on the inner wall portion of the housing member 12 so that the leak port 7 is fixed along the inner wall portion of the housing member 12 without bending. Similarly, when the leak port 7 is relatively short, the fixing portion 16 of the housing member 12 may be provided on the outer wall portion so as to fix the leak port 7 along the outer wall portion of the housing member 12. .. That is, the fixing portion 16 of the housing member 12 may be provided on at least one of the inner wall portion and the outer wall portion of the housing member 12 and fix the leak port 7 along the housing member 12.

The leak port 7 of the housing 2 is a pipe portion having a similar cross-sectional area, even if the acoustic passage communicating with the acoustic space 18 and guiding the sound wave to the external space is not necessarily formed of a flexible tubular material. A substitute may be provided by providing the housing member 12 so as to penetrate the outer wall portion and the inner wall portion. Further, the cover 8 attached to the housing member 12 may be used to provide an acoustic passage instead of the leak port 7. Further, the leak port 7 may not be entirely formed of a flexible tubular material , but may be partially replaced by a pipe portion penetrating the outer wall portion and the inner wall portion of the housing member 12 as described above. If the leak port 7 can be lengthened, the audio reproduction frequency band can be sufficiently widened to ensure good reproduction sound quality.

Further, if the leak port 7 is formed so that the opening area of the opening end portions 7a and 7c is larger than the cross-sectional area at the intermediate portion 7b by cutting the tube or the tubular material diagonally. , The operation and effect as a leak port can be enhanced. Therefore, the leak port 7 may be formed by connecting tubular members having different thicknesses.

Further, in the above embodiment, the leak port 7 is provided with a protective member 15 having air permeability at the opening end portion 7c communicating with the external space, but the protective member 15 is an opening end communicating with the acoustic space 18 of the leak port 7. It may be provided in the part 7a. It is possible to prevent a problem that the leak port 7 is closed or narrowed due to foreign matter entering the inside of the leak port 7.

The earphone of the present invention is not limited to the canal type earphone as shown in the figure, and may be an earphone provided with another ear hook portion. Further, the earphones are not limited to the earphones, and earphones corresponding to both the left and right ears may be connected by a headband to form an overhead type earphone. Earphones are not limited to home stereo playback or multi-channel surround playback, but can also be applied to in-vehicle audio equipment and sound reproduction equipment such as movie theaters.

1, 10 Earphone 2 Housing 3 Speaker unit 4 Cord bush 5 Cord 6 Earpiece 7 Leak port 8 Cover 11 Base member 12 Housing member 14, 15 Protective net 16 Fixing part 17, 18 Acoustic space

Claims (8)

A speaker unit that converts audio signals into sound waves
An earphone in which the speaker unit is attached, and a housing that defines a first acoustic space and a second acoustic space on one side and the other side of the diaphragm of the speaker unit is provided.
The housing communicates with the first acoustic space to form a first acoustic passage that guides sound waves to the user's ear canal, and a second acoustic passage that communicates with the second acoustic space and guides sound waves to an external space. With a leak port that forms a
The leak port portion comprises a cylindrical member having a flexibility to configure the second acoustic path, the outer wall of the inner wall and the housing of the housing constituting the second sound space without bending the tubular member It has a fixed part that is fixed along the part,
earphone. A speaker unit that converts audio signals into sound waves
An earphone in which the speaker unit is attached, and a housing that defines a first acoustic space and a second acoustic space on one side and the other side of the diaphragm of the speaker unit is provided.
The housing communicates with the first acoustic space to form a first acoustic passage that guides sound waves to the user's ear canal, and a second acoustic passage that communicates with the second acoustic space and guides sound waves to an external space. With a leak port that forms a
The leak port portion spirally winds a tubular material in the second acoustic space to form the second acoustic passage.
earphone. The fixing portion of the leak port portion includes a groove or a cover member provided on the inner wall portion and / or the outer wall portion of the housing constituting the second acoustic space and accommodating the tubular material.
The earphone according to claim 1 . The second acoustic passage of the leak port portion is formed so that the opening area of the opening end portion communicating with the second acoustic space or the external space is larger than the cross-sectional area at the intermediate portion thereof.
The earphone according to any one of claims 1 to 3. The tubular member of the leak port portion further includes a protective member having air permeability at an opening end portion communicating with the second acoustic space or the external space.
The earphone according to any one of claims 1 to 4. The housing further comprises a cord connection for connecting a cord that supplies the audio signal to the speaker unit.
The earphone according to any one of claims 1 to 5. The housing comprises an earpiece attachment portion at the tip of the nozzle portion for attaching an earpiece to be inserted into the user's ear canal.
The earpiece to be attached to the earpiece mounting portion is further provided.
The earphone according to any one of claims 1 to 6. A speaker unit that converts audio signals into sound waves
An earphone in which the speaker unit is attached, and a housing that defines a first acoustic space and a second acoustic space on one side and the other side of the diaphragm of the speaker unit is provided.
The housing communicates with the first acoustic space to form a first acoustic passage that guides sound waves to the user's ear canal, and a second acoustic passage that communicates with the second acoustic space and guides sound waves to an external space. With a leak port that forms a
The leak port portion spirally winds the tubular material in the second acoustic space to form the second acoustic passage.
earphone.