JP7437244B2 - earphone - Google Patents

Description

The present invention relates to an earphone equipped with a feedback type microphone.

Conventionally, earphones are known that include a speaker that emits sound waves, a microphone that can collect external noise, and a control board that controls the operation of the speaker and microphone (for example, see Patent Documents 1 and 2). ). There are two types of noise canceling methods: a feedback method in which a microphone is placed inside the speaker (on the ear side), and a feedforward method in which the microphone is placed outside the speaker. The earphones described in Patent Documents 1 and 2 adopt a feedback method, and this feedback method has a microphone placed on the ear side with respect to the sound waves emitted from the speaker, so there is less noise compared to the feedforward method. The reduction effect is high.

The earphone described in Patent Document 1 includes a long cylindrical acoustic tube, and a speaker and a microphone that are housed in two recesses formed by recessing the wall surface of the acoustic tube outward. The sound emitting surface of the speaker is flush with the inner peripheral surface of the acoustic tube to prevent disturbing the acoustic impedance of the acoustic tube, and the microphone is also placed outside the sound path of the acoustic tube so as not to disturb the acoustic impedance of the acoustic tube. ing.

In the earphone described in Patent Document 2, a microphone is connected with an adhesive or the like to a cutout in the side wall of a front cavity from which sound waves from a speaker are radiated. This microphone is provided with a sound introduction hole, and through this sound introduction hole, an audio signal generated by collecting sound from a speaker and an audio signal generated by collecting external noise are transmitted. The noise canceling signal is transmitted to the control board, and the control board that receives these audio signals generates a noise canceling signal.

Japanese Patent Application Publication No. 8-79873 Special table 2019-524028 publication

As in the earphone described in Patent Document 1, when the acoustic tube is formed with an outwardly recessed part and the microphone is accommodated in this recessed part, it is difficult to electrically connect the microphone and the control board. It is necessary to provide a hole for installing a conducting wire in the acoustic tube and seal it, which makes assembly difficult. If the earphone described in Patent Document 2 has a configuration in which a microphone is connected to a cutout in the side wall of the front cavity using an adhesive or the like, the cutout does not properly secure a sound path, resulting in unstable sound quality. .

Therefore, there is a need for earphones that are easy to assemble and can provide stable sound quality.

The earphone according to the present invention has a characteristic configuration including a speaker that emits sound waves, a sound tract space that houses the speaker and through which the sound waves radiated from the speaker passes, and a sound tract space that communicates with the sound tract space and is insertable into the external auditory canal. a first housing having an open end; a microphone disposed closer to the open end than the speaker and outside the sound path space; a second housing covering the microphone; a control board that controls the operation of the microphone, and the first housing includes a side wall formed closer to the open end than the speaker, and a part of the outer surface of the side wall recessed inward. a side wall recess formed therein; the side wall recess is covered by the second housing to form a housing space for the microphone; A partition wall is formed to partition the space, and a communication hole is formed in the partition wall to communicate the sound path space and the accommodation space.

Feedback type earphones in which the microphone is placed closer to the open end (ear side) than the speaker as in this configuration have a higher noise reduction effect than feedforward type earphones. On the other hand, when a microphone is placed in the sound path space, the acoustic characteristics are unstable, and it is necessary to make a wiring hole in the housing and seal it to electrically connect the microphone and the control board, making assembly difficult. .

Therefore, this configuration includes a first housing and a second housing, and a partition wall is provided in the side wall recess of the first housing. As a result, the sound path space through which the sound waves radiated from the speaker pass and the housing space for the microphone are formed as separate spaces, thereby stabilizing the sound quality. In addition, by simply covering the side wall recess, which is formed by recessing the outer surface of the side wall of the first housing, with the second housing, the sound path space and the microphone housing space can be formed as separate spaces. Easy to assemble.

Furthermore, since a housing space for the microphone is formed by covering the side wall recess of the first housing with the second housing, wiring for electrically connecting the microphone and the control board is provided outside the first housing. becomes possible. As a result, there is no need to provide a hole for microphone wiring in the first housing that accommodates the speaker, and ease of assembly is improved. Further, since a communication hole is formed in the partition wall of the side wall recess of the first housing to communicate the sound path space and the microphone housing space, processing is easy. In this way, we were able to provide earphones that are easy to assemble and provide stable sound quality.

Another characteristic configuration is that a plurality of communication holes are provided, and each of the plurality of communication holes is constituted by an air pressure adjustment hole and a sound collection hole for the microphone.

By configuring the air pressure adjustment hole as the communication hole in addition to the sound collection hole of the microphone as in this configuration, it is possible to reduce the burden on the eardrum when the earphone is inserted into the ear canal.

Another characteristic configuration is that the microphone has a flexible board electrically connected to the control board, and the flexible board extends outside the first housing.

As in this configuration, if the wiring that electrically connects the microphone and the control board is constructed from a flexible board and this flexible board is extended outside the first housing, the ease of assembly is further improved.

Another characteristic feature is that the flexible substrate is formed with a through hole that overlaps with the communication hole.

By forming a through hole that overlaps with the communication hole in the flexible substrate as in this configuration, it becomes possible to easily form a minute through hole that is difficult to provide in the first housing, which improves the acoustics in the sound path space. The effect on characteristics can be minimized.

Another characteristic configuration further includes an intervening member disposed between the flexible substrate and the partition wall, and the intervening member is formed with a second through hole that has the same shape and overlaps with the communication hole. At the point.

By providing an intervening member between the flexible substrate and the partition wall as in this configuration, the flexible substrate is stably supported and the flexible substrate can be easily routed to the outside of the first housing. Further, since the second through hole having the same shape as the communication hole is provided in the intervening member, the sound path space and the microphone accommodation space can be reliably communicated with each other.

It is an external perspective view of an earphone. FIG. 3 is an exploded perspective view of the earphone. FIG. 3 is a cross-sectional view of the earphone. FIG. 2 is a perspective view showing how flexible boards are arranged.

EMBODIMENT OF THE INVENTION Below, embodiment of the earphone based on this invention is described based on drawing. In this embodiment, an earphone 100 that includes a microphone 3 and cancels noise using a feedback method will be described as an example of an earphone. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the gist thereof.

As shown in FIG. 1, the earphone 100 according to the present embodiment is a canal-type (earplug-type) wireless earphone that includes an ear pad 10 made of an elastic material such as elastomer that fits tightly into the ear canal. FIG. 1 shows one earphone 100 that is inserted into the right ear, and the other earphone 100 that is inserted into the left ear has a similar structure with left-right symmetry, so the following explanation will be omitted. Both earphones 100 are configured to be capable of short-range wireless communication with a device such as a mobile phone. Note that the earphone 100 may be connected to a device by wire, or may be an inner ear type earphone, and is not particularly limited.

As shown in FIGS. 2 and 3, the earphone 100 includes a speaker 1, a first housing 2, a microphone 3, a second housing 4, and a control board 5. The earphone 100 also includes a third housing 7, a spacer 8, and a flexible substrate 9. The first housing 2, the second housing 4, and the third housing 7 are made of an insulating material such as resin, and the wiring of the flexible board 9 is made of a conductive metal material. Further, although the spacer 8 in this embodiment is made of double-sided tape, it may be made of resin, metal, or the like.

The speaker 1 is housed in the first housing 2 while being electrically connected to the control board 5 (see FIG. 3). The speaker 1 receives an audio signal output from the control board 5, converts the audio signal into sound, and emits sound waves from the diaphragm 11. The speaker 1 includes a dome-shaped diaphragm 11, a voice coil 12 fixed to the diaphragm 11, a magnetic circuit 13 that vibrates the voice coil 12, and a frame 14 that houses the voice coil 12 and the magnetic circuit 13. . Since the speaker 1 is a known dynamic speaker, a detailed description thereof will be omitted.

The first housing 2 has an open end 21 that can be inserted into the external auditory canal, and a cylindrical shape that is formed closer to the open end 21 than the speaker 1 and extends from the open end 21 to the speaker 1 side so as to expand in diameter. 22 (an example of a side wall), and a base portion 23 that extends from the cylindrical portion 22 and forms a speaker housing space 23a that accommodates the speaker 1.

The open end 21 has an annular recess 21a, and an air permeable acoustic register 24 covering the opening is fixed to the annular recess 21a. Furthermore, an engagement recess 21b is formed on the outer surface of the open end 21, with which the engagement protrusion 10a of the ear pad 10 engages.

The open end portion 21 communicates with a sound path space 2A formed inside the cylindrical portion 22, and the sound waves emitted from the speaker 1 pass through this sound path space 2A. The cylindrical portion 22 has a shape that expands outward in a trumpet shape as it goes from the open end 21 toward the base portion 23, and has a side wall recess 25 in which a part of the outer surface is recessed inward. The side wall recess 25 includes a bottom portion 25a (an example of a partition wall) in which a plurality of elongated (two in this embodiment) first through holes 25a1 (an example of a communication hole) are formed, and a first spacer 81 to be described later. The first side surface 25b is formed with a guide recess 25b1 in which the first protrusion 81b is engaged and guided, and the first side surface 25b is inclined so that the height decreases from both sides of the first side surface 25b toward the opening end 21. It includes a pair of second side surfaces 25c and a third side surface 25d that is parallel to the first side surface 25b and connects the pair of second side surfaces 25c on the side of the open end 21 (see FIG. 2). That is, the bottom 25a of the side wall recess 25 is surrounded by a first side surface 25b, a pair of second side surfaces 25c, and a third side surface 25d.

The bottom portion 25a partitions the sound path space 2A and a microphone accommodation space 3A, which will be described later (see FIG. 3). The plurality of first through holes 25a1 formed in the bottom portion 25a communicate the sound path space 2A and the microphone accommodation space 3A, and the first through hole 25a1 located near the center of the bottom portion 25a allows the microphone 3 to be collected. A part of the sound hole 26 and the first through hole 25a1 located near the opening end 21 are each configured as a part of the air pressure adjustment hole 27. A partition wall 44 of a second housing 4, which will be described later, faces the first side surface 25b, a side wall 42 of a second housing 4, which will be described later, faces the second side surface 25c, and a third side surface 25d are opposed by a connecting wall 43 of a second housing 4, which will be described later (see FIGS. 2 and 3).

The microphone 3 is electrically connected to the control board 5 via the flexible board 9, is arranged closer to the open end 21 of the first housing 2 than the speaker 1, and is located outside the sound path space 2A. (See Figure 3). This microphone 3 can collect not only surrounding noise but also the speaking voice of the person wearing the earphone 100. The microphone 3 collects the sound of the sound path space 2A through the sound collection hole 26, and also collects surrounding noise, and transmits the generated audio signal to the control board 5, and the control board 5 receives the sound signal. It is configured to output to the speaker 1 a noise cancellation signal whose phase is inverted. It should be noted that the feedback type noise canceling mechanism and communication mechanism of the microphone 3 are well known, so a detailed explanation thereof will be omitted.

The second housing 4 covers the microphone 3. The second housing 4 includes a top wall 41 that covers above the side wall recess 25 of the first housing 2, a pair of side walls 42 that stand up from the top wall 41 and are inserted into the side wall recess 25, and a connecting wall 43 that connects the distal end portion (the end portion of the first housing 2 on the open end 21 side), and the base end portion of the pair of side wall portions 42 (the end portion of the first housing 2 on the base portion 23 side). (See FIG. 2). By fitting the second housing 4 into the side wall recess 25, the top wall 41, the pair of side walls 42, the connecting wall 43, the partition wall 44, and the bottom 25a of the side wall recess 25 (strictly speaking, a flexible substrate) are inserted into the side wall recess 25. 9), a microphone housing space 3A (an example of a housing space) is formed. A microphone 3 is housed in the microphone housing space 3A (see FIG. 3). That is, by covering the side wall recess 25 with the second housing 4, the microphone housing space 3A is formed.

When the second housing 4 is fitted into the side wall recess 25 , the top wall 41 smoothly connects with the outer shape of the cylindrical portion 22 , becomes integrated with the cylindrical portion 22 , and becomes trumpet-shaped as it goes from the connecting wall 43 toward the partition wall 44 . The main wall part 41a has a shape that expands to the outer side and has the microphone accommodation space 3A formed inside, and the auxiliary wall part 41b extends from the main wall part 41a and faces the base part 23 of the first housing 2. It is configured. The pair of side wall portions 42 are respectively opposed to the pair of second side surfaces 25c of the first housing 2, and similarly to the second side surfaces 25c, the side walls 42 are inclined so that the height decreases from the partition wall 44 toward the connection wall 43. are doing. The connection wall 43 faces the third side surface 25d of the first housing 2, and has a notch 43a that communicates the above-mentioned air pressure adjustment hole 27 with the outside. Note that the cutout portion 43a may be a through hole.

The partition wall 44 stands up from near the longitudinal center of the top wall 41 and faces the first side surface 25b of the first housing 2. These pair of side wall portions 42, connection wall 43, and partition wall 44 are configured as standing portions that stand up from the ceiling wall 41, and are fitted or bonded to the side surfaces 25b, 25c, and 25d of the first housing 2. At the same time, the second housing 4 is fixed to the first housing 2 by adhering the auxiliary wall portion 41b to the base portion 23 of the first housing 2 with the flexible substrate 9 interposed therebetween.

The control board 5 has a control circuit that controls the operation of the speaker 1 and microphone 3. This control circuit is composed of a wireless communication LSI, an audio data processing LSI, and the like, and is supplied with power from a battery (not shown). Since the operation mode of the speaker 1 and the microphone 3 by the control board 5 is well known, detailed explanation will be omitted.

The third housing 7 includes a bottom cover 70, an accommodation base 71 that accommodates the control board 5 between the bottom cover 70, a block-shaped part 72 extending in a block shape from the accommodation base 71, and an accommodation base 71 and the block. It has a protruding cylindrical part 73 that protrudes cylindrically from the shaped part 72, and these accommodation base 71, block-shaped part 72, and protruding cylindrical part 73 are integrally formed (see FIG. 1). The protruding cylinder part 73 includes a support wall part 73a that covers and supports the auxiliary wall part 41b of the top wall 41 (see FIGS. 2 and 3). A fixing part 73b is formed inside the support wall part 73a, and has a hole into which a plurality of (two in this embodiment) bolts B for fixing the third housing 7 to the first housing 2 are inserted. (See Figure 2).

The spacer 8 is made of double-sided tape and includes a first spacer 81 (an example of an intervening member), a second spacer 82, a third spacer 83, and a fourth spacer 84 (see FIG. 2). The first spacer 81 is arranged between the flexible substrate 9 and the bottom 25a of the side wall recess 25, and the second spacer 82 is arranged between the flexible substrate 9, the pair of side walls 42 of the second housing 4, the connecting wall 43, and It is arranged between the partition wall 44 and the partition wall 44 . In other words, the flexible substrate 9 is fixed in position by fixing the second housing 4 to the first housing 2 with the flexible substrate 9 sandwiched between the first spacer 81 and the second spacer 82 and bonded to each other.

The first spacer 81 is made of a rectangular member, and a rectangular portion 81a and a first protruding portion 81b protruding from one side of the rectangular portion 81a are integrally formed. A plurality of (two in this embodiment) second through holes 81a1 are formed in the rectangular portion 81a, each having the same shape as the first through hole 25a1 and a slightly larger elongated hole shape than the first through hole 25a1. There is. The plurality of second through holes 81a1 each overlap with the plurality of first through holes 25a1, and the second through hole 81a1 located near the center of the rectangular portion 81a serves as a part of the sound collection hole 26 of the microphone 3. The second through holes 81a1 located near the open end 21 are each configured as a part of the air pressure adjustment hole 27. The second spacer 82 is constituted by a rectangular annular member with an open center, and a rectangular annular portion 82a and a second protruding portion 82b protruding from one side of the rectangular annular portion 82a are integrally formed. The microphone 3 is inserted into the central opening of the rectangular annular portion 82a. The first protrusion 81b and the second protrusion 82b are inserted into the guide recess 25b1 of the side wall recess 25 and positioned.

The third spacer 83 is composed of a bending member adhered to the outer surface of the base portion 23, and extends from the rectangular plane portion 83a and near the center of the plane portion 83a, and is narrower than the plane portion 83a and bent. The bent portion 83b is integrally formed. The fourth spacer 84 is composed of a U-shaped member, and includes a pair of arm portions 84a provided at a position that does not interfere with the bent portion 83b, and a connecting portion 84b that connects the pair of arm portions 84a. ing. A hole 84a1 into which a bolt B is inserted is formed in each arm 84a. With the flexible substrate 9 sandwiched and bonded between the third spacer 83 and the fourth spacer 84, the third housing 7 is attached to the first housing 2 by bolts B inserted into the holes 84a1 of the fixing part 73b and the arm part 84a. By being fixed, the position of the flexible substrate 9 is fixed.

As shown in FIG. 4, the flexible substrate 9 extends to the outside of the first housing 2 (at a location that does not interfere with the sound path space 2A). The flexible board 9 is formed at a rectangular plate-shaped base 91 to which the microphone 3 is electrically connected, an extension 92 extending from the base 91, and an end of the extension 92, and is connected to the control board 5. A connecting end 93 to be electrically connected is integrally formed.

The base 91 is supported by being sandwiched between the first spacer 81 and the second spacer 82 with the microphone 3 disposed at the center. A plurality of (two in the present embodiment) third through holes 91a (an example of through holes) are formed in the base 91 (see also FIG. 3). The plurality of third through holes 91a overlap with the plurality of first through holes 25a1 and second through holes 81a1, respectively, and the third through hole 91a located near the center of the base 91 is the sound collection hole 26 of the microphone 3. The third through hole 91a located near the opening end 21 is made up of a minute round hole with a diameter of about 0.2 mm as a part of the air pressure adjustment hole 27. Consists of round holes. That is, the sound collection hole 26 is composed of a first through hole 25a1, a second through hole 81a1, and a third through hole 91a located near the center of the bottom 25a of the first housing 2, and the air pressure adjustment hole 27 is It is composed of a first through hole 25a1 located near the open end 21 of the bottom 25a of the first housing 2, a second through hole 81a1, and a third through hole 91a. In this embodiment, the sound quality of the sound waves passing through the sound path space 2A is improved by forming a plurality of third through holes 91a made up of minute round holes in the flexible substrate 9, which is easy to process. be able to.

The extending portion 92 includes a first extending portion 92a that bends and extends from the base 91 along the guide recess 25b1 of the side wall recess 25, and a first extending portion 92a that bends and extends from the first extending portion 92a along the side surface of the base portion 23. a second extending portion 92b extending from the second extending portion 92b, a third extending portion 92c extending bent from the second extending portion 92b along the end surface of the base portion 23, and a third extending portion 92c extending from the third extending portion 92c. It has a fourth extending portion 92d that bends and extends toward the control board 5. A central hole 92c1 through which a portion of the bottom plate 14a of the frame 14 of the speaker 1 is exposed is formed in the third extending portion 92c. The connection end portion 93 is formed as a plate spring made by bending a plate member into a wave shape, and is configured to prevent the electrical connection between the flexible board 9 and the control board 5 from being broken due to vibration.

A method for assembling the earphone 100 according to the embodiment described above is as follows. As shown in FIG. 2, in a state where the first spacer 81, the base 91 of the flexible substrate 9 on which the microphone 3 is mounted, and the second spacer 82 are stacked in this order, the first spacer 81 and the second spacer 82 are stacked. The protrusions 81b and 82b are inserted into the guide recess 25b1 of the first housing 2, and then the second housing 4 is fixed to the side wall recess 25 of the first housing 2. As a result, the first through hole 25a1, the second through hole 81a1, and the third through hole 91a overlap, and the sound collection hole 26 of the microphone 3 and the air pressure adjustment hole 27 are formed. This air pressure adjustment hole 27 is located outside the mounting part of the microphone 3, and as a result, the sound path space 2A communicates with the outside via the notch 43a of the connection wall 43 of the second housing 4, so that the earphone 100 can be connected to the outside. It can reduce the burden on the eardrum when inserted into the ear canal.

Further, with the third spacer 83 adhesively fixed to the side surface of the base portion 23, the third extending portion 92c of the flexible substrate 9 and the fourth spacer 84 are stacked in this order, and the fixed portion 73b of the third housing 7 is stacked. Then, a bolt B is inserted into the hole 84a1 of the fourth spacer 84 to fix the third housing 7 to the first housing 2 housing the speaker 1. Then, the connecting end 93 of the flexible board 9 is inserted into a through hole (not shown) of the third housing 7 to be electrically connected to the control board 5, and the bottom cover 70 is attached to the accommodation base 71 that accommodates the control board 5 and the like. Fix it. Thereafter, the acoustic register 24 is fixed to the annular recess 21a of the open end 21 of the first housing 2, and the ear pad 10 is attached to complete the earphone 100 (see FIG. 1).

In the feedback method in which the microphone 3 is placed closer to the open end 21 of the first housing 2 than the speaker 1 as in this embodiment, the microphone 3 is placed closer to the ear with respect to the sound waves emitted from the speaker 1. Therefore, it has a higher noise reduction effect than the feedforward method. This feedback type earphone 100 includes a first housing 2 and a second housing 4, and a bottom portion 25a serving as a partition wall is provided in a side wall recess 25 of the first housing 2. Thereby, the sound path space 2A through which the sound waves radiated from the speaker 1 pass and the microphone accommodation space 3A are formed as separate spaces, so that the sound quality is stabilized. In this embodiment, a pair of side walls 42, a connecting wall 43, and a partition wall 44 are provided upright from the top wall 41 of the second housing 4 in a side wall recess 25 in which the outer surface of the cylindrical portion 22 of the first housing 2 is recessed inward. By interpolating , it becomes possible to form the sound path space 2A and the microphone accommodation space 3A as separate spaces, which facilitates assembly.

Furthermore, since the microphone housing space 3A is formed by covering the side wall recess 25 of the first housing 2 with the second housing 4, a flexible board 9 for electrically connecting the microphone 3 and the control board 5 is provided. It becomes possible to provide it outside the first housing 2. As a result, it is not necessary to provide a wiring hole in the first housing 2 that houses the speaker 1, and the ease of assembly is improved. Furthermore, since the wiring that electrically connects the microphone 3 and the control board 5 is formed of a flexible board 9, and this flexible board 9 is extended outside the first housing 2, the ease of assembly is further improved. At this time, since the first spacer 81 is provided between the flexible substrate 9 and the bottom 25a of the side wall recess 25, the flexible substrate 9 is stably supported, and the flexible substrate 9 can be routed to the outside of the first housing 2. becomes easier.

Further, since the first through hole 25a1 is formed in the side wall recess 25 of the first housing 2 to communicate the sound path space 2A and the microphone accommodation space 3A, processing is easy. Furthermore, if a first elongated through hole 25a1 is formed in the bottom 25a of the side wall recess 25 and a third through hole 91a overlapping with the first through hole 25a1 is formed in the base 91 of the flexible substrate 9, the third through hole Since the diameter of the hole 91a can be configured to be minute, the sound path space 2A and the microphone accommodation space 3A can be communicated without affecting the acoustic characteristics. Further, since the first spacer 81 is provided with the second through hole 81a1 having the same shape as the first through hole 25a1, the sound path space 2A and the microphone accommodation space 3A can be reliably communicated with each other.

[Other embodiments]
(1) In the embodiment described above, at least one of the pair of side wall portions 42, the connection wall 43, and the partition wall 44 as an upright portion extending from the top wall 41 of the second housing 4 may be provided. , it may be configured with only the ceiling wall 41.
(2) The spacer 8 in the embodiment described above may be omitted. At this time, at least one of the first spacer 81, the second spacer 82, the third spacer 83, and the fourth spacer 84 may be omitted, or all of them may be omitted. Further, the air pressure adjustment hole 27 in the above-described embodiment may be omitted and the sound collection hole 26 may be used alone.
(3) In the embodiment described above, the flexible board 9 was provided to connect the microphone 3 and the control board 5, but the extending portion 92 may be formed of a conductive wire.

INDUSTRIAL APPLICATION This invention can be utilized for the earphone equipped with the feedback type microphone.

1: Speaker 2: First housing 2A: Sound path space 3: Microphone 3A: Microphone accommodation space (accommodation space)
4 : Second housing 5 : Control board 9 : Flexible board 21 : Open end part 22 : Cylindrical part (side wall)
25: Side wall recess 25a: Bottom (partition wall)
25a1: First through hole (communication hole)
26: Sound collection hole 27: Air pressure adjustment hole 81: First spacer (intervening member)
81a1: Second through hole 91a: Third through hole (through hole)
100: Earphones

Claims (4)

a speaker that emits sound waves;
a first housing that houses the speaker and has a sound path space through which the sound waves emitted from the speaker passes; and an open end that communicates with the sound path space and can be inserted into the external auditory canal;
a microphone disposed closer to the open end than the speaker and outside the sound path space;
a second housing covering the microphone;
A control board that controls the operation of the speaker and the microphone,
The first housing has a side wall formed closer to the opening end than the speaker, and a side wall recess formed by recessing a part of the outer surface of the side wall inward,
A housing space for the microphone is formed by covering the side wall recess with the second housing,
A partition wall that partitions the sound path space and the accommodation space is formed in the side wall recess, and a communication hole that communicates the sound path space and the accommodation space is formed in the partition wall. ,
A plurality of the communicating holes are provided,
In the earphone, each of the plurality of communication holes includes an air pressure adjustment hole and a sound collection hole for the microphone . The microphone has a flexible board electrically connected to the control board,
The earphone according to claim 1 , wherein the flexible substrate extends outside the first housing. The earphone according to claim 2 , wherein the flexible substrate has a through hole that overlaps with the communication hole. further comprising an intervening member disposed between the flexible substrate and the partition wall,
The earphone according to claim 3 , wherein the intervening member is formed with a second through hole that has the same shape and overlaps with the communication hole.

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