JP2018006784A - Earphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a canal type earphone in which an outlet of a sound wave to be regenerated is designed to be inserted into an external canal entrance of a user, and which achieves clear suitable sound regeneration by forming a housing to acquire an appropriate sound pressure frequency characteristic when a speaker unit is attached to the earphone.SOLUTION: An earphone 1 includes: a nozzle part that forms a first acoustic passage in which a housing 2 is communicated with a first acoustic space 17 so as to guide a sound wave to an external canal of a user; and a leak port part 7 that forms a second acoustic passage being communicated with a second acoustic space 18 so as to guide a sound wave into an external space. The leak port part includes: a cylindrical material 7 with flexibility which constitutes the second acoustic passage; and a fixing part 16 that fixes a cylindrical body without bending the cylindrical body along an inner wall part of the housing constituting the second acoustic space or an external wall part of the housing.SELECTED DRAWING: Figure 2

Description

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

  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 types of earphones worn on the user's ear.

  For example, some earphones have a relatively large speaker unit such as a headphone and an ear hook that is mounted so that the main body is placed on the auricle. In addition, there is an inner-ear type that is mounted so that the main body is contained inside the auricle and emits sound from the sound emitting surface of the main body toward the ear canal. In addition, there is an earphone of a type called a canal type that is mounted so that the main body portion is stored inside the auricle and the sound tube portion protruding from the main body portion is inserted into the ear canal together with the earpiece attached thereto. It is popular.

  As the speaker unit becomes smaller, it becomes more difficult to obtain a high sound pressure level and to sufficiently widen the sound reproduction frequency band to ensure good reproduction sound quality. The same problem occurs in the speaker unit in the inner ear type or canal type earphone worn on the user's ear. In particular, in a canal-type earphone in which the sound wave outlet to be played is inserted into the user's ear canal entrance, a speaker unit with a small housing, a necessary and sufficient sound reproduction capability, and a large diaphragm unit may be used. There is a problem that it is difficult and easily affected by the structure of the housing.

  A conventional earphone housing may be provided with an opening, a hole, an acoustic passage, a leak port, and the like that allow communication between the internal space and the external space of the housing. In particular, there are some which provide a relatively long acoustic passage that communicates from the internal space on the back side of the speaker unit of the housing to the external space (Patent Documents 1 and 2).

  In addition, conventionally, an acoustic space is formed inside, a casing having a cylindrical sound guide part protruding from the front surface, an ear pad attached to the sound guide part and inserted into the ear canal, A frame provided in the housing for separating the acoustic space into a first acoustic space and a second acoustic space; and an electrical signal converted into a first sound wave to convert the acoustic space into the first acoustic space and the second acoustic space. An electrical sound wave conversion unit that outputs to a sound unit; and a sound pressure adjustment unit that is attached to the frame, wherein the sound pressure adjustment unit includes a third acoustic space that communicates with the first air hole, and the second A cylindrical second ventilation hole communicating with the acoustic space and the third acoustic space, and a first acoustic resistance which is inserted into the second ventilation hole and reduces the sound pressure in a predetermined frequency band by adjusting the insertion position. There is a canal type earphone characterized by having (Patent Document) ).

  However, further improvement of the conventional earphone is desired. In particular, in a canal type earphone in which the outlet of the sound wave to be reproduced is inserted into the user's ear canal entrance, the structure of the housing that forms an extremely small internal space affects the sound pressure frequency characteristics of the sound wave to be reproduced. If the sound is not clearly heard, it is difficult to realize natural and favorable sound reproduction.

Japanese Utility Model Publication No. 63-95388 JP-A-2015-195444 Japanese Patent No. 5696249

  The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a canal-type earphone in which a sound wave outlet to be reproduced is inserted into a user's ear canal entrance, and a speaker unit is attached. It is an object of the present invention to provide an earphone that realizes a clear and preferable sound reproduction by constructing a housing that obtains an appropriate sound pressure frequency characteristic in a case where the sound is reproduced.

  The earphone of the present invention includes a speaker unit for electroacoustic converting sound signals into sound waves, and a speaker unit attached to the inside thereof, and a first acoustic space and a second sound on one side and the other side of the diaphragm of the speaker unit, respectively. An earphone comprising a housing defining a space, wherein the housing communicates with the first acoustic space to form a first acoustic path that guides sound waves to the user's ear canal, and communicates with the second acoustic space. And a leak port portion that forms a second acoustic passage for guiding sound waves to the external space, and the leak port portion bends the tubular body and a flexible tubular material that constitutes the second acoustic passage. And 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 forms a second acoustic path by spirally winding a tubular material.

  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 has a groove or a cover member that accommodates the tubular material. Including.

  Preferably, in the earphone of the present invention, in the second acoustic passage of the leak port portion, 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. It is formed as follows.

  Preferably, in the earphone of the present invention, 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.

  Preferably, in the earphone of the present invention, the housing further includes a cord connecting portion for connecting a cord for supplying an audio signal to the speaker unit.

  Preferably, in the earphone of the present invention, the housing includes an earpiece mounting portion that attaches an earpiece that is inserted into the user's ear canal at the tip of the nozzle portion, and further includes an earpiece that is attached to the earpiece mounting portion.

  The operation of the present invention will be described below.

  The earphone of the present invention includes a speaker unit for electroacoustic converting sound signals into sound waves, and a speaker unit attached to the inside thereof, and a first acoustic space and a second sound on one side and the other side of the diaphragm of the speaker unit, respectively. And a housing that defines a space. The housing includes a nozzle portion that forms a first acoustic path that communicates with the first acoustic space and guides sound waves to the user's ear canal. Therefore, if the housing further includes a cord connection portion for connecting a cord for supplying an audio signal to the speaker unit, and the nozzle portion of the housing further includes an earpiece attachment portion for attaching an earpiece inserted into the user's ear canal The canal type earphone in which the earpiece is in close contact with the ear canal can be realized.

  The housing of the earphone includes a leak port portion that forms a second acoustic passage that communicates with the second acoustic space and 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 constituting the second acoustic space or the outer wall portion of the housing without bending the tubular body. And a fixing part. Since the cylindrical material which is a hollow tubular member has flexibility, the fixing portion shapes the cylindrical material into a predetermined shape and fixes it to the housing.

  Therefore, in a canal-type earphone, a flexible cylindrical material is attached to the housing even when a thin and long second acoustic path must be formed in order to obtain an appropriate sound pressure frequency characteristic. Thus, the leak port portion does not protrude significantly from the housing, and the entire housing can be reduced in size. 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 forms a second acoustic path by winding a cylindrical material in a spiral shape. When the cylindrical material is wound spirally, the second acoustic passage having a dimension longer than the dimension corresponding to the circumferential length of at least the substantially circular housing can be formed, so in a relatively low frequency band. In addition, the resonance frequency can be adjusted, and there is an advantage that a satisfactory reproduction sound quality can be secured by sufficiently widening the sound reproduction frequency band.

  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 has a groove or a cover member that accommodates the tubular material. Including. If a fixing part that provides a groove for fitting the cylindrical body into the inner wall part and the outer wall part of the housing or a fixing part that fixes the cylindrical body with a cover member is formed, a predetermined substantially arc shape without bending the cylindrical body Can be shaped 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 cylindrical body forming the leak port portion is bent. When fixing a cylindrical body to the outer wall part of a housing with a cover member, the earphone which is given the design property to a cover member and is excellent in aesthetics is realizable.

  Further, the second acoustic passage of the leak port portion may be formed such 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. For example, if the opening end of the cylindrical body that forms the leak port portion is cut obliquely to make the opening elliptical, the opening area can be made larger than the cross-sectional area at the intermediate portion. The operation and effect as a port can be enhanced. In the case where 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 enters the inside of the tubular material from the opening end portion. Thus, the problem that the second acoustic passage is closed or narrowed can be prevented.

  The earphone of the present invention can provide a canal-type earphone that realizes a clear and preferable sound reproduction by constituting 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 preferable embodiment of this invention. Example 1 It is a figure explaining the internal structure of the earphone by preferable embodiment of this invention. Example 1 It is a graph explaining the sound pressure frequency characteristic of the earphone by preferable embodiment of this invention.

  Hereinafter, although the earphone by preferable embodiment of this invention is demonstrated, this invention is not limited to these embodiment.

  1 and 2 are diagrams illustrating an earphone 1 according to a preferred embodiment of the present invention. Specifically, FIG. 1 shows a perspective view of the earphone 1 that is worn on one ear of the user, with the cover 8 that is fixed to the housing member 12 so as to hide a part of the leak port 7 described later being removed. This is shown in the figure.

  FIG. 2 is a cross-sectional view for explaining the internal structure of the earphone 1. 2A is a cross-sectional view of the AA ′ cross section of FIG. 1, and FIG. 2B shows only the leak port 7 corresponding to the BB ′ cross section of FIG. 2A. FIG. 2C is a cross-sectional view taken along the line CC ′ of the leak port 7 in FIG. In addition, illustration and description are abbreviate | omitted about the structure of the other earphone 1 unnecessary for description of this invention.

  The earphone 1 of the present embodiment is a canal type earphone in which an outlet of a sound wave to be reproduced is inserted into an ear canal hole of a user's pinna. The earphone 1 includes substantially symmetrical earphones that are respectively attached to 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 the present embodiment.

  In the earphone 1, a speaker unit 3 that reproduces sound by supplying an audio signal via a cord 5 is attached to the housing 2. The speaker unit 3 is an electrodynamic electroacoustic transducer 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 an audio signal is supplied. The speaker unit 3 radiates sound waves having an antiphase 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 the present embodiment can be mounted 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 that is 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 are separated from the acoustic space 17 on the rear side where the magnetic circuit of the speaker unit 3 exists. A space 18 is formed.

  The base member 11 is made of a metal material or a resin material, and includes a speaker unit attachment portion that attaches the speaker unit 3 to the inner wall portion. The outer diameter frame of the speaker unit 3 has an outer dimension 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 that is formed so that the tip side is narrower than the speaker unit mounting portion so as to be inserted into the ear 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 external auditory canal.

  In the nozzle portion of the base member 11, an earpiece mounting portion for mounting the earpiece 6 is formed on the outer peripheral surface. 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 auricle. In addition, the protection net | network 14 as a protective member which has air permeability is attached to the opening edge part of a nozzle part. The protective net 14 prevents problems such as foreign matter entering the inside from the opening end of the nozzle portion and closing the acoustic path. The base member 11 may include a leak hole or port (not shown) that communicates with the acoustic space 17 and guides sound waves to the external space.

  On the other hand, the housing member 12 is made of a metal material or a resin material, and is connected to a cord bush 4 that fixes a cord 5 that supplies an audio signal to the speaker unit 3. The cord bush 4 is formed of a flexible rubber material so as to include the cord 5 therein, and one side thereof is attached to the attachment hole of the housing member 12. In the case of the earphone 1 in which the jack for plug connection is provided in the housing 2, the cord 5 is used instead of the cord bush 4 as a cord connecting portion for connecting the cord 5 for supplying the audio signal to the speaker unit 3 to the housing member 12. You may provide the jack in which the plug of the tip of is inserted.

  The housing member 12 includes an acoustic space 18 that is 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 path that guides sound waves to the external space. The leak port 7 constitutes an acoustic path 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 cylindrical material made of flexible silicon resin. As illustrated, the leak port 7 has an open end 7 a communicating with the acoustic space 18 disposed inside the housing member 12, and an open end 7 c communicating with the external space disposed outside the housing member 12.

  The length and the 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. The leak port 7 may be a hollow cylindrical material having flexibility to obtain a required inner diameter, and the material is not limited to silicon resin. The leak port 7 may be other than a silicon resin, and may be, for example, a rubber material, an elastomer resin material, or a PVC (polyvinyl chloride) resin material.

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

  In the canal type earphone 1, in order to obtain an appropriate sound pressure frequency characteristic, the leak port 7 which is a thin and long acoustic path must be formed. Since the leak port 7 is an extremely thin and long member as compared with the dimension of the housing 2, it is necessary to devise a special way to attach the leak port 7 to the housing 2. In order to store the long leak port 7 in the housing 2 as in the case of the present embodiment, it is necessary to shape it into a predetermined shape without providing a bent portion. This is because if the bent portion where the tube bends suddenly is formed, the inside of the cylindrical body is closed, or the area of the inside is remarkably reduced, so that the tube does not function as an acoustic path.

  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 constituting the acoustic space 18 without bending the leak port 7. A fixing portion 16 a as a groove into which the leak port 7 is fitted is formed on the inner wall portion of the housing member 12. Similarly, a fixing portion 16 b is formed on the outer wall portion of the housing member 12 as a groove along the leak port 7. The fixed portion 16 a and the fixed portion 16 b are configured to communicate with each other through a hole that penetrates 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 a double-sided tape may be used.

  Accordingly, as shown in FIGS. 1 and 2, the leak port 7, which is a hollow tubular member, has flexibility and is shaped into a predetermined substantially arc shape without being bent by the fixing portion 16. The housing member 12 is fixed. At the same time, one end of the cylindrical leak port 7 is exposed at the outer wall portion of the housing member 12. However, since the leak port 7 is fixed along the housing member 12, the leak port 7 does not protrude significantly from the housing 2, and the entire housing 2 of the earphone 1 can be downsized.

  The fixing portion 16 that fixes the leak port 7 can be not only a groove that accommodates the tubular leak port 7 but also other fixing members. In the case of the present embodiment, a cover 8 is further provided which is attached to the outer wall portion of the housing member 12 so as to cover and fix the leak port 7 and to prevent the leak port 7 from appearing outside. Yes. 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. The design of the cover 8 can be given to improve the appearance of the earphone 1.

  FIG. 3 is a graph for explaining the sound pressure frequency characteristics of the earphone 1 of the present embodiment and the earphone 10 of the comparative example, the horizontal axis indicates the frequency of the input audio signal, and the vertical axis indicates the measurement jig. Indicates 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 does not include the leak port 7 that forms the acoustic path that communicates with the acoustic space 18 and guides the sound wave to the external space in the earphone 1 of the present embodiment. . The speaker unit 3 is common. Therefore, FIG. 3 shows the 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 varies greatly depending on the presence or absence of the leak port 7. Compared to the earphone 10 of the comparative example, the earphone 1 of the present embodiment is improved so that approximately 300 Hz to 1 kHz has a substantially flat characteristic. As a result, it is possible to improve the clarity of reproduced sound. As the canal type earphone 1 in which the outlet of the sound wave to be reproduced is inserted into the user's ear canal entrance, it is possible to realize natural and preferable sound reproduction compared to the earphone 10 of the comparative example.

  Here, the leak port 7 is preferably formed by spirally winding a thin cylindrical material to form an acoustic path. This is because it is appropriate that the length of the leak port 7 is longer than at least the dimension corresponding to the circumferential length of the substantially circular housing 2. If the leak port 7 is shortened, the sound pressure in the vicinity of 300 Hz cannot be lowered as in the case of the above-described embodiment, so that the intelligibility of the reproduced sound is lowered and the reproduced sound quality is deteriorated.

  In addition, in the canal type earphone 1, the leak port 7 that forms the acoustic path by spirally winding the thin tubular material as described above is preferable. On the other hand, the leak port having the same thinness / length is used. When 7 is applied to another conventional earphone that is not a canal type, the same effect cannot be obtained. In that case, the sound pressure level in the low sound range becomes high, the intelligibility becomes low, and the sound reproduction frequency band becomes narrow. As a result, it is difficult for such an earphone to ensure good reproduction sound quality.

  In order to accommodate the relatively long leak port 7 in the housing 2 as compared with the size of the housing 2 of the earphone 1, it is necessary to shape it into a predetermined shape without providing a bent portion as in this embodiment. . On that basis, it is preferable to shape the long cylindrical leak port 7 so as to be wound in a spiral shape so as to be wound at least once or more. Even if it can be accommodated in one rotation or less, if the fixing portion 16 is provided so as to shape the leak port 7 so as to be spirally wound, the inner wall portion of the housing member 12 constituting the acoustic space 18 and / or Or it can fix along an outer wall part.

  When the leak port 7 is relatively short, or when the leak port 7 is shaped to be spirally wound inside the housing member 12, the leak port 7 comes out of the housing member 12. When the length of the portion is shortened and becomes the shortest, the opening end 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 as to fix the leak port 7 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. . In other words, 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.

  Note that the leak port 7 of the housing 2 has a pipe portion having the same cross-sectional area even if the acoustic passage that communicates with the acoustic space 18 and guides the sound wave to the external space is not necessarily formed of a flexible cylindrical body. Alternatively, the housing member 12 may be provided so as to penetrate the outer wall portion and the inner wall portion. In addition, an acoustic path instead of the leak port 7 may be provided by using the cover 8 attached to the housing member 12. Further, the leak port 7 may not be entirely formed of a flexible cylindrical body, but a part thereof may be substituted by the 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, it is possible to sufficiently widen the sound reproduction frequency band and ensure good reproduction sound quality.

  The leak port 7 is formed so that the opening areas of the opening end portions 7a and 7c are larger than the cross-sectional area at the intermediate portion 7b by obliquely cutting the tube or the cylindrical body. The operation and effect as a leak port can be enhanced. Therefore, the leak port 7 may be formed by connecting cylindrical bodies having different thicknesses.

  Moreover, in the said Example, although the leak port 7 is provided with the protection member 15 which has air permeability in the opening edge part 7c connected to external space, the protection member 15 is an opening end connected to the acoustic space 18 of the leak port 7. You may provide in the part 7a. It is possible to prevent such a problem that the foreign substance is mixed in the leak port 7 and the leak port 7 is closed or narrowed.

  The earphone of the present invention is not limited to a canal-type earphone as shown in the figure, and may be an earphone provided with another ear hook. Moreover, not only an earphone but an earphone of an overhead type may be configured by connecting earphones corresponding to both left and right ears by a headband. The earphone is not limited to home stereo reproduction or multi-channel surround reproduction, and can be applied to in-vehicle audio equipment and sound reproduction equipment such as a movie theater.

DESCRIPTION OF SYMBOLS 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 (7)

A speaker unit for electroacoustic converting sound signals into sound waves;
An earphone including the speaker unit mounted therein and a housing defining a first acoustic space and a second acoustic space on one side and the other side of the diaphragm of the speaker unit,
The housing communicates with the first acoustic space to form a first acoustic passage that guides the sound wave to the user's external auditory canal, and the second acoustic passage communicates with the second acoustic space and guides the sound wave to the external space. Forming a leak port portion,
The leak port portion has a flexible tubular material constituting the second acoustic passage, and the inner wall portion of the housing or the outer wall of the housing constituting the second acoustic space without bending the tubular body. A fixing part for fixing along the part,
earphone. The leak port portion spirally winds the tubular material to form the second acoustic path;
The earphone according to claim 1. The fixing part of the leak port part includes a groove or a cover member that is provided on the inner wall part and / or the outer wall part of the housing constituting the second acoustic space and accommodates the tubular material.
The earphone according to claim 1 or 2. The second acoustic passage of the leak port portion is formed such that an opening area of an opening end portion communicating with the second acoustic space or the external space is larger than a cross-sectional area at an intermediate portion thereof.
The earphone according to claim 1. 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 claim 1. The housing further includes a cord connecting portion for connecting a cord for supplying the audio signal to the speaker unit.
The earphone according to claim 1. The housing includes an earpiece attaching portion for attaching an earpiece to be inserted into the user's ear canal at the tip of the nozzle portion,
The earpiece attached to the earpiece attachment portion further includes
The earphone according to claim 1.