JP2015056782A - Earpiece and earphone including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ear piece from which excellent reproduction sound quality can be obtained, while ensuring high sealability when inserted into the ear canal.SOLUTION: An ear piece (3) includes a cylindrical base (3a) having a through hole (3a3), an umbrella-shaped part (3b) connected with one end side (3a1) of the base (3a) and extending in umbrella-shape toward the other end side (3a2) so as to cover the base (3a), an engaging part (3f) provided on the other end side (3a2) of the through hole (3a3), and engaging with the sound tube portion (2) of an earphone (51), and a plurality of recesses (3d) gouged radially outward in the inner surface of the through hole (3a3) on one end side (3a1), and formed while spaced apart in the circumferential direction.

Description

  The present invention relates to an earpiece and an earphone including the earpiece.

For example, Patent Document 1 discloses an earphone including a main body portion that houses a speaker unit, a cylindrical sound tube portion that protrudes from the main body portion, and an earpiece that is detachably attached to the sound tube portion. .
This earphone is referred to as a so-called canal type, and is used by inserting an earpiece into the ear canal and mounting the main body portion inside the auricle. In this state of use, the output sound of the speaker unit passes through the sound tube portion and is released into the ear canal from the sound hole at the tip of the earpiece.

It is known that the canal type earphone can hear the reproduced sound better as the sealing property inside the ear canal when the earpiece is inserted is higher, that is, as the sound leakage to the external space is smaller.
Therefore, the earpiece is a flexible material with a thin umbrella-shaped portion that spreads out in the shape of an umbrella of the sea moon on the rear side starting from the tip side in order to make good contact with the inner wall of the ear canal and ensure sealing performance. Is formed.

JP 2013-021591 A

By the way, from the viewpoint of reproduction sound quality, it is desirable that the opening shape of the sound hole provided at the tip of the earpiece is as close to a circle as possible and the opening area is as large (wide) as possible.
Since the conventional earpiece has high flexibility, depending on the passage shape and cross-sectional shape of the inserted ear canal, the tip portion of the earpiece may be excessively deformed and the opening shape of the sound hole may be significantly deformed. It was. Further, compression occurs with the excessive deformation, and the opening area of the sound hole may be reduced.
If such a significant deformation or a reduction in the opening area of the normal shape of the sound hole (for example, a circle) occurs, the reproduced sound quality may be degraded. In addition, there is a risk that external noise may be mixed into the reproduced sound, or a sound that leaks outside may increase.
For this reason, it has been desired that the sound quality of the earpiece is prevented from being significantly deteriorated and the opening area is prevented from being significantly reduced while the sound tightness in the ear canal is secured, and the reproduction sound quality is not deteriorated.

  Therefore, the problem to be solved by the present invention is to provide an earpiece and an earphone provided with the earpiece which can obtain a good reproduction sound quality while ensuring high sealing performance in the ear canal in a use state inserted into the ear canal. It is in.

In order to solve the above problems, the present invention has the following configuration.
1) A cylindrical base portion (3a) having a through hole (3a3), and an umbrella shape that is connected to one end side (3a1) of the base portion (3a) and covers the base portion (3a) toward the other end side (3a2) And an engagement portion (3f) provided on the other end side (3a2) of the through hole (3a3) and engaged with the sound tube portion (2) of the earphone (51). And a plurality of recesses (3d) formed on the inner surface of the one end side (3a1) of the through hole (3a3) so as to be directed radially outward and spaced apart in the circumferential direction. (3).
2) a speaker unit (SP), a main body portion (1) containing the speaker unit (SP), a sound tube portion (2) protruding from the main body portion (1), and a sound tube portion (2). An earpiece (3) that is detachably mounted. The earpiece (3) is the earpiece described in 1), and the engagement portion (3f) is engaged with the sound tube portion (2). The earphone (51) is characterized by being mounted as an earphone.

  According to the present invention, there is an effect that a good reproduction sound quality can be obtained while ensuring high airtightness in the ear canal in a state of use inserted into the ear canal.

It is a perspective view for demonstrating the earphone 51 which is an Example of an earphone provided with the earpiece which concerns on embodiment of this invention. 4 is a partial cross-sectional view for explaining an earphone 51. FIG. 4 is a longitudinal sectional view for explaining an earpiece 3 attached to the earphone 51. FIG. 3 is a front view for explaining an earpiece 3; FIG. FIG. 3 is a perspective view for explaining an earpiece 3. FIG. 4 is a partial cross-sectional view for explaining an earpiece 3. It is a schematic diagram for demonstrating a deformation | transformation of the sound hole 3e of the earpiece 3. FIG. 6 is a graph for explaining deformation of a sound hole 3e of the earpiece 3. It is a schematic diagram for demonstrating the process which inserts the earpiece 3 in the ear canal E1. It is a perspective view for demonstrating the deformation | transformation state of the sound hole 3e of the earpiece 3. FIG.

DESCRIPTION OF EMBODIMENTS An earpiece and an earphone including the earpiece according to an embodiment of the present invention will be described with reference to FIGS.
In the following description, the front and rear directions are defined in the directions of the arrows in FIG. This direction is not related to the direction in the posture in use, and is defined for convenience in order to facilitate understanding.

(Example)
First, with reference to FIG.1 and FIG.2, the structure of the earphone 51 of an Example is demonstrated. FIG. 1 is an external perspective view of the earphone 51, and FIG. 2 is a partial cross-sectional view at the S1-S1 position in FIG.

The earphone 51 includes a speaker unit SP, a main body 1 that accommodates the speaker unit SP therein, and a cord C that has one end connected to the speaker unit SP and the other end pulled out from the main body 1. Yes.
Inside the main body 1, a front cavity V <b> 1 is formed as a gap on the front side of the sound emission surface SP <b> 1 of the speaker unit SP.

The main body 1 is formed with a sound tube portion 2 that protrudes in a direction orthogonal to or inclined from the sound emission surface SP1 of the speaker unit SP. In the earphone 51 of the embodiment, the sound tube portion 2 is formed in the tilt direction.
The sound tube portion 2 is formed in a cylindrical shape, for example. The outer shape of the cross section of the sound tube portion 2 is not limited to a circle, and may be an ellipse or a square.
The sound tube portion 2 is formed with a through hole 2a that communicates the front cavity V1 and the external space. The cross-sectional shape of the through hole 2a is not limited, but is preferably circular.
A flange portion 2c projecting outward is provided on the tip end side of the sound tube portion 2. A surface of the flange portion 2c on the main body portion 1 side is a step surface 2c1 orthogonal to the axis CL2 of the sound tube portion 2.

An earpiece 3 is detachably attached to the outer peripheral surface 2 b of the sound tube portion 2.
The earpiece 3 will be described in detail with reference to FIGS.
FIG. 3 is a longitudinal sectional view of a single piece of the earpiece 3 shown in FIG. 2, FIG. 4 is a front view of the earpiece 3, and FIG. 5 is a perspective view as seen obliquely from the front.

The earpiece 3 is formed in an axially symmetric shape with the axis line CL3 as an axis of symmetry.
Specifically, the base 3a is connected to the substantially tubular base 3a with the axis CL3 as an axis, and the front end 3a1 that is one end of the base 3a, and toward the rear end 3a2 that is the other end of the base 3a. And an umbrella-shaped portion 3b extending in the shape of a sea-moon umbrella so as to cover from the outside. The position having the maximum diameter in the umbrella-shaped portion 3b is between the front end portion 3a1 and the rear end portion 3a2.
The thickness of the base portion 3a is formed thicker than the thickness of the umbrella-shaped portion 3b.
That is, the umbrella-shaped portion 3b is basically less rigid than the base portion 3a.
The base portion 3a has a through hole 3a3 penetrating in the front and rear direction. As for through-hole 3a3, front-end part 3a1 is opened as the sound hole 3e. Here, a portion in front of the sound tube portion 2 in the through hole 3a3 is defined as a sound hole 3e.
The earpiece 3 is made of a flexible material. For example, elastomer or rubber. An example in the case of rubber can be silicone rubber.

The base 3a is divided into four regions AR1 to AR4 in the direction of the axis CL3 due to its shape.
Specifically, from the rear end portion 3a2 side, the engagement flange region AR1 in which the flange portion 3f is formed, the engagement region AR2 that engages with the flange portion 2c of the sound tube portion 2, and the inclined region in which the inner diameter gradually decreases. This is the suppression area AR4 in which the sound emitted from the through holes 2a of the AR3 and the sound tube portion 2 is guided into the ear canal and excessive deformation is self-regulated. Self-regulation of excessive deformation in the suppression area AR4 will be described later.

The flange portion 3f formed in the engagement flange region AR1 is a portion that engages with the step surface 2c1 in the sound tube portion 2. The flange portion 3f is a reduced-diameter portion formed to project radially inward. The inner diameter D1 of the flange portion 3f is set to be the same or slightly smaller than the outer diameter of the outer peripheral surface 2b of the sound tube portion 2.
Further, the surface on the front end 3a1 side of the flange 3f is a step surface 3f1 orthogonal to the axis CL3.

The engagement area AR <b> 2 is a portion that engages with the flange portion 2 c of the sound tube portion 2. The inner diameter D2 of the engagement region AR2 is set to be the same or slightly smaller than the outer diameter of the flange portion 2c.
With the setting of the inner diameter D1 and the inner diameter D2, the earpiece 3 has no clearance when engaged with the sound tube portion 2, and is slightly strongly fitted by setting.
Further, by setting the inner diameter D1 and the inner diameter D2, the outer peripheral surface 2b of the sound tube portion 2 and the inner peripheral surface of the base portion 3a of the earpiece 3 are in close contact with each other, and the air flow between the two is blocked. .
The engagement flange area AR <b> 1 and the engagement area AR <b> 2 are engagement portions that engage with the sound tube portion 2.
Since the earpiece 3 has flexibility, the engagement flange area AR1 and the engagement area AR2 are detachably engaged with the sound tube portion 2. In a state where the earpiece 3 is attached to the sound tube portion 2, the axis line CL2 and the axis line CL3 are usually set to coincide with each other.

The most distal-side restraining area AR4 is beaten with an inner wall 3c having an inner surface 3c1 having an inner diameter D3 smaller than the inner diameter D2 of the engaging area AR2, and having a predetermined width outward in the radial direction, and the axis line The slit 3d is a plurality of recesses extending in the CL3 direction and spaced apart at a predetermined angular interval in the circumferential direction.
The depth of the slit 3d is, for example, (D2-D3) / 2. That is, the diameter of the bottommost position of the slit 3d is equal to the inner diameter D2.
In other words, the suppression region AR4 is beaten at a depth (D2-D3) / 2 from the inner wall portion 3c having a part of the peripheral surface of the inner radius (D3) / 2 as the inner surface 3c1. Slits 3d extending in the direction of the axis CL3 are alternately formed in the circumferential direction.
The angular pitch θa in which the slits 3d are formed is, for example, θa = 30 ° as shown in FIG. Therefore, the earpiece 3 has 12 slits 3d.

The inner wall 3c and the slit 3d will be described in more detail with reference to FIG.
FIG. 6 is a partial cross-sectional view showing one inner wall portion 3c and two slits 3d adjacent to the inner wall portion 3c at the position S3-S3 in FIG.
As shown in FIG. 6, a pair of inner side surfaces 3d1 facing each other in the slit 3d are formed in a plane including the axis line CL3. Therefore, the facing distance between the pair of inner side surfaces 3d1 becomes the minimum value at the opening exit of the slit 3d. Hereinafter, the width at the opening exit of the slit 3d is referred to as the opening width M of the slit 3d.

In the earpiece 3 of the embodiment, the circumferential angle θb that defines the opening width M is the same for all the slits 3d.
The angle θb becomes larger toward the front of the earpiece 3. That is, the slit 3d is formed so as to gradually widen toward the front so that the width thereof becomes the maximum angle θb1 at the front end portion of the earpiece 3.
The angle θb is the minimum angle θb2 at the position P1 (see FIG. 3) on the rearmost side of the suppression area AR4 (boundary with the inclined area AR3).

  The front outlet portion of the inner wall portion 3c may be rounded. The radius of R to be applied is, for example, approximately (D2-D3) / 2.

The inclined area AR3 is an area that connects the engagement area AR2 with the inner diameter D2 and the suppression area AR4 with the inner diameter D3 smaller than the inner diameter D2.
Specifically, in the inclined area AR3, the portion corresponding to the inner wall 3c gradually decreases from the inner diameter D2 to become the inner diameter D3 as it goes from the rear to the front.
The inclined area AR3 and the suppression area AR4 are portions (non-engaging portions) where the sound tube portion 2 is not engaged. That is, it is a portion in front of the sound tube portion 2.

As described above, the earpiece 3 includes a plurality of slits 3d spaced in the circumferential direction with a predetermined width on the inner surface of a portion in front of the sound tube portion 2 in the sound hole 3e. Have. Thereby, in the insertion of the earpiece 3 into the ear canal, excessive deformation of the sound hole 3e is suppressed.
Next, this deformation suppression will be described in detail with reference to FIGS.

  The details of the portion A when the circular sound hole 3e shown in FIG. 7A is inserted into the external auditory canal and deformed so as to be narrowed in the left-right direction as shown in FIG. 7B, for example. Is shown in FIG. 7 (c) and FIG.

Let r be the inner radius that is the radius of curvature when the sound hole 3e of the earpiece 3 has a regular shape.
When the earpiece 3 is deformed so that the left and right direction of the sound hole 3e is crushed narrowly, for example, the curvature radius ra of the left and right side portions of the inner surface 3c1 of the inner wall portion 3c is larger than the inner radius r, and the curvature of the upper and lower side portions. The radius rb is smaller than the inner radius r. In other words, the curvature of the left and right side parts becomes smaller at the left and right side parts and becomes larger at the upper and lower side parts.

  Therefore, if the curvature of the regular shape on the inner surface 3c1 of the inner wall 3c is N, the curvature when deformed is Nk, and the ratio Nk / N is the curvature change ratio NP, the degree of deformation of the sound hole 3e is: This curvature change ratio NP can be grasped. It can be seen that the greater the curvature change ratio NP is from 1, the greater the degree of deformation that the curvature radius becomes smaller. It can also be seen that the greater the curvature change ratio NP is less than 1, the greater the degree of deformation that the curvature radius becomes.

FIG. 8 is a graph showing an example of the relationship among the curvature change ratio NP, the opening width M, and the insertion distance d.
The horizontal axis is the insertion distance d of the earpiece 3 into the ear canal E, and the distance d0 is the position where the earpiece 3 of the earphone 51 has started to be inserted into the ear canal.
The first vertical axis (left) is the opening width M, and the second vertical axis (right) is the curvature change ratio NP.
The relationship shown in FIG. 8 is an example that can explain the deformation of part A in FIG. 7, for example.
FIG. 9 is a schematic diagram illustrating a process in which the earpiece 3 of the earphone 51 is inserted into the ear canal E1.
FIG. 9A shows an insertion start state (distance d0), FIG. 9B shows a state in the middle of insertion, and FIG. 9C shows a state inserted to a predetermined position (distance d2). Yes.

When the earpiece 3 is inserted into the ear canal [FIG. 9 (a)], the cross-sectional shape of the ear canal 3 is smaller than the outer diameter of the umbrella-shaped portion 3b of the earpiece 3, so that the umbrella-shaped portion 3b deforms so as to sag. start. In other words, this deformation is caused by the force in the reduced diameter direction that the umbrella-shaped portion 3b receives from the inner wall of the ear canal.
For example, when the external auditory canal is vertically long, the umbrella-shaped portion 3b is deformed so that the horizontal (left and right) direction is narrower than the vertical (vertical) direction as shown in FIG. 7B.

The deformation of the umbrella-shaped portion 3b also affects the deformation of the sound hole 3e. Similarly, the sound hole 3e is deformed into a vertically long shape so that the horizontal direction is narrower than the vertical direction while being compressed in the diameter-reducing direction. To do.
As a result, the opening width M of the slit 3d in the portion A decreases from the maximum value M1 in the natural state of the distance d0 as insertion proceeds.
As the opening width M decreases, the sound hole 3e is deformed into a vertically long shape, so that the curvature of the inner surface 3c1 of the inner wall portion 3c in the A portion also changes. That is, the curvature change ratio NP gradually increases as insertion proceeds from the initial value 1 in the natural state.

  This deformation proceeds satisfactorily without any restriction until the middle stage. That is, since the umbrella-shaped portion 3b is deformed so as to sag along the cross-sectional shape of the external auditory canal E1, the insertion proceeds while ensuring good sealing in the external auditory canal.

  As shown in FIG. 9B, when the insertion proceeds to some extent, if the deformation of the sound hole 3e proceeds excessively according to the shape in the ear canal, the opening width M may become 0 (zero). In this description, it is assumed that the opening width M is 0 (zero), the insertion distance is the distance d1, and the curvature change ratio NP at the distance d1 is NP1.

  The state in which the opening width M is 0 (zero) is shown in FIG. 7C and FIG. FIG. 7C is a schematic cross-sectional view corresponding to FIG. FIG. 10 is a partial perspective view showing the state of part A in FIG.

As the deformation progresses, the inner wall 3c and the slit 3d are subjected to a force in the direction of closing the slit 3d (arrow DR1), and any portion in the extending direction of the slit 3d is closed, so that at least one of the pair of inner side surfaces 3d1 is closed. A part is in contact. For example, the opening end 3d2 of the slit 3d in FIG. 7A comes into contact with the state shown in FIG. 7C.
That is, the inner wall 3c and the slit 3d are deformed so as to be compressed in the circumferential direction. When the deformation reaches a predetermined amount, at least a part of the pair of inner side surfaces 3d1 (for example, the open ends 3d2) abut. FIG. 10 shows a state in which two adjacent slits 3d are in contact with each other at a position P2 and a position P3.

When the deformation progresses and reaches a predetermined deformation amount and the inner side surfaces 3d1 facing each other of the slit 3d come into contact with each other, a reaction force is generated in the subsequent deformation, so that the deformation exceeding the predetermined deformation amount is suppressed. That is, the inner side surface 3d1 facing the slit 3d functions as a deformation suppressing portion HY that suppresses deformation.
Accordingly, with the insertion after the distance d1, the opening width M is maintained at 0 (zero), and the curvature change ratio NP is remarkably increased and excessive deformation is suppressed.
In this state, the insertion into the ear canal E1 further proceeds, and the earpiece 3 enters to the predetermined mounting position (d2) shown in FIG.
The predetermined deformation amount with which the pair of inner side surfaces 3d1 abut may be set in the design according to the shape of the earphone 51 and the mounting specifications.

  The earphone 51 provided with the above-described earpiece 3 allows the sound hole 3e of the earpiece 3 to be deformed until the sound hole 3e reaches a predetermined deformation amount in the process of inserting the earpiece 3 into the ear canal E1. It has a deformation suppressing portion HY that suppresses further deformation when it reaches the deformation amount. In the embodiment, the deformation suppressing portion HY is a pair of inner side surfaces 3d1 in the slit 3d.

  The earpiece 3 and the earphone 51 are allowed to deform until reaching a predetermined deformation amount in the deformation suppressing portion HY, so that the umbrella-shaped portion 3b of the earpiece 3 adheres well to the inner wall of the ear canal E1, and the earpiece 3 and the earphone 51 are in the ear canal E1. Airtightness is ensured. Moreover, the deformation | transformation suppression by the deformation | transformation suppression part HY after reaching predetermined deformation | transformation amount suppresses the excessive deformation | transformation of the sound hole 3e and the reduction | decrease of an opening area.

Moreover, the umbrella-shaped part 3b is urged | biased by the inner wall of the ear canal E1 with the reaction force which arises by deformation | transformation suppression. Thereby, the adhesiveness of the umbrella-shaped part 3b and the inner wall of the ear canal E1 improves more.
Therefore, the earpiece 3 and the earphone 51 can ensure good airtightness in the external auditory canal during use and can obtain a good reproduction sound quality.

If the earpiece does not have the deformation suppressing portion HY, there is a possibility that the base portion 3a may also be deformed when the deformation of the umbrella-shaped portion 3b becomes excessively large.
If the base 3a is deformed, there is a concern that the adhesion in the engagement with the sound tube portion 2 is lowered, and the reproduced sound quality is affected.
Since the ear piece 3 of the embodiment is provided with the deformation suppressing portion HY, even if the base portion 3a is deformed, it can be sufficiently reduced. As a result, the adhesion between the outer peripheral surface 2b of the sound tube portion 2 and the inner peripheral surface of the base portion 3a of the earpiece 3 is not deteriorated, and the hermeticity in the ear canal is ensured and the influence on the reproduced sound quality is substantially reduced. Does not occur.
The earpiece 3 and the earphone 51 having the earpiece 3 are well sealed in the external auditory canal, so that mixing of external noise into the reproduced sound and leakage of the reproduced sound to the outside are well suppressed.

  The embodiments of the present invention are not limited to the above-described configuration, and modifications may be made without departing from the spirit of the present invention.

In the embodiment, the circumferential angle θb that defines the opening width M has been described as increasing toward the front of the earpiece 3, but is not limited thereto.
It may be smaller as it goes forward or may not change in the front-rear direction.
As the length of the earpiece 3 in front of the sound tube portion 2, that is, the length of the suppression region AR4 and the inclined region AR3 in the direction of the axis CL3, the deformation of the sound hole 3e tends to increase. Therefore, when the length of the part ahead of the sound tube portion 2 is longer, the angle θb may be made smaller toward the front of the earpiece 3.

In the embodiment, the example in which the opening width M of the plurality of slits 3d is the same has been described, but the present invention is not limited to this.
When it is desired to vary the amount of deformation that begins to suppress deformation in the sound hole 3e due to the shape or material of the earpiece 3 or because the shape or insertion posture of the ear canal to be inserted is determined. Alternatively, the opening width M may be different for each slit 3d.
When the deformation amount of a certain circumferential part (range) is desired to be smaller than the other part (range), the opening width M of the slit (3d) of that part (range) is set to be smaller than the others so that the suppression starts with a small deformation. Also set a smaller value. That is, the angle θb is set small.
On the other hand, when there is a circumferential position (range) in which large deformation can be allowed, the opening width M is made larger than the others so that the amount of deformation at which deformation suppression starts increases in the slit 3d of that portion (range). Set. That is, the angle θb is set large.

  In the embodiment, the cross-sectional shape of the slit 3d is not limited. A trapezoidal shape, an arc shape, or the like may be used as long as the shape has a pair of inner side surfaces 3d1 that abut in a deformation-suppressed state.

In the embodiment, the angle formed between the inner side surface 3d1 of the slit 3d and the inner surface 3c1 of the inner wall portion 3c is a right angle. However, the present invention is not limited to this, and the opening at the opening outlet is larger than the width of the bottom surface of the slit 3d. The width M may be reduced, and the angle (inferior angle) formed by the inner surface 3d1 and the inner surface 3c1 may be an acute angle. By appropriately setting the acute angle value, it is possible to control the timing at which the suppression of the diameter reduction deformation in the process of inserting the earpiece 3 into the ear canal E starts.
Further, since the earpiece 3 has flexibility, the smaller the acute angle value, the larger the collapse amount of the contact portion at the beginning of the suppression of the diameter reduction deformation. As a result, the reduction of the diameter reduction is moderately performed instead of suddenly, so that the insertion feel when the earpiece 3 is inserted into the ear canal E is improved.

DESCRIPTION OF SYMBOLS 1 Main-body part 2 Sound tube part 2a Through-hole, 2b Outer peripheral surface, 2c Flange part, 2c1 Step surface 3 Earpiece 3a Base part, 3a1 Front end part, 3a2 Rear end part, 3a3 Through-hole 3b Umbrella-shaped part, 3c Inner wall part, 3c1 Inner surface 3d Slit 3d1 Inner side, 3d2 Open end, 3e Sound hole 3f Flange part, 3f1 Step surface 51 Earphone AR1 Engagement flange area, AR2 Engagement area, AR3 Inclination area AR4 Suppression area C code, CL2, CL3 Axis d, d0 , D1, d2 Insertion distance D2, D3 Inner diameter E1 Ear canal HY Deformation suppression part M Opening width N Curvature, NP Curvature change ratio r Inner radius, ra, rb Curvature radius SP Speaker unit, SP1 Sound emission surface V1 Front cavity θa Angular pitch, θb angle θb1 maximum angle, θb2 minimum angle

Claims (3)

A cylindrical base having a through hole;
An umbrella-shaped portion connected to one end side of the base portion and extending in an umbrella shape so as to cover the base portion toward the other end side;
An engaging portion that is provided on the other end side of the through hole and engages a sound tube portion of the earphone;
A plurality of recesses formed on the inner surface of the one end side of the through-hole, facing outward in the radial direction and spaced apart in the circumferential direction;
Earpiece with.   The pair of opening ends facing each other in the recess are deformed so that when the inner surface of the one end side is deformed to be compressed in the circumferential direction, the deformation reaches a predetermined deformation amount and exceeds the predetermined deformation amount. The earpiece according to claim 1, wherein the earpiece is a deformation suppressing portion that suppresses the deformation. A speaker unit, a main body that houses the speaker unit, a sound tube that protrudes from the main body, and an earpiece that is detachably attached to the sound tube,
The earpiece is the earpiece according to claim 1 or 2, wherein the engagement portion is engaged with and attached to the sound tube portion.

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