JP2021197672A - earphone - Google Patents

Abstract

To provide an earphone having high assemblability and capable of stabilizing sound quality.SOLUTION: An earphone includes: a speaker 1; a first housing 2 for storing the speaker 1; a microphone 3; a second housing 4 for covering the microphone 3; and a control board 5. The first housing 2 includes a side wall recession part 25 formed by inwardly recessing a part of an outer surface of a side wall 22. A storage space 3A of the microphone 3 is formed by allowing the side wall recession part 25 to be covered by the second housing 4. A partition wall 25a for partitioning a sound path space 2A and a storage space 3A is formed in the side wall recession part 25. A communication hole 25a1 for allowing the sound path space 2A and the storage space 3A to communicate each other is formed in the partition wall 25a.SELECTED DRAWING: Figure 3

Description

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

Conventionally, earphones including a speaker that radiates sound waves, a microphone that can collect external noise, and a control board that controls the operation of the speaker and the microphone are known (see, for example, Patent Documents 1 and 2). ). As the noise canceling method, there are a feedback method in which the microphone is arranged inside (ear side) from the speaker and a feedforward method in which the microphone is arranged outside the speaker. The earphones described in Patent Documents 1 and 2 employ a feedback method, and this feedback method has noise as compared with the feed-forward method because the microphone is arranged on the ear side with respect to the sound wave radiated from the speaker. The reduction effect is high.

The earphone described in Patent Document 1 includes a long tubular acoustic tube, and a speaker and a microphone each housed in two recesses formed by recessing the wall surface of the acoustic tube to the outside. 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 to a portion of the side wall of the front cavity from which the sound wave of the speaker is radiated with an adhesive or the like. This microphone is provided with an sound introduction hole, and the sound signal generated by collecting the sound from the speaker and the sound signal generated by collecting the external noise are collected through the sound introduction hole. A noise canceling signal is generated by the control board that transmits to the control board and receives these audio signals.

Japanese Unexamined Patent Publication No. 8-79873 Special Table 2019-524028

Like the earphone described in Patent Document 1, in the form of forming a concave portion recessed outward in the acoustic tube and accommodating the microphone in this concave portion, in order to electrically connect the microphone and the control board. It is necessary to provide a hole for arranging the conductor in the acoustic tube and seal it, resulting in poor assembleability. When the microphone is connected to the notched portion of the side wall of the front cavity with an adhesive or the like as in the earphone described in Patent Document 2, the sound path is not properly secured by the notched portion and the sound quality is not stable. ..

Therefore, earphones that are highly assembleable and can stabilize sound quality are desired.

The characteristic configuration of the earphone according to the present invention is that it can be inserted into the external auditory canal by communicating with the speaker that emits sound, the sound path space that accommodates the speaker and the sound path emitted from the speaker passes through, and the sound path space. A first housing having an open end portion, a microphone arranged on the side of the open end portion with respect to the speaker and outside the sound path space, a second housing covering the microphone, the speaker, and the speaker. A control board for controlling the operation of the microphone is provided, and the first housing has a side wall formed on the side of the opening end portion of the speaker, and a part of the outer surface of the side wall is recessed inward. It has a formed side wall recess, and the side wall recess is covered with the second housing to form an accommodation space for the microphone, and the side wall recess has the sound path space and the accommodation. A partition wall for partitioning the space is formed, and the partition wall is formed with a communication hole for communicating the sound path space and the accommodation space.

A feedback type earphone in which a microphone is arranged on the side of the opening end (ear side) of the speaker as in this configuration has a higher noise reduction effect than a feedforward type earphone. On the other hand, when the microphone is placed in the sound path space, the acoustic characteristics are not stable, and it is necessary to provide a wiring hole in the housing to seal the housing in order to electrically connect the microphone and the control board, resulting in poor assembly. ..

Therefore, in this configuration, a first housing and a second housing are provided, 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 wave radiated from the speaker passes and the accommodation space of the microphone are formed in different spaces, so that the sound quality is stable. In addition, the sound path space and the microphone accommodation space can be formed in different spaces by simply covering the side wall recess with the outer surface of the side wall of the first housing recessed inward with the second housing. Easy to assemble.

Further, since the side wall recess of the first housing is covered with the second housing to form a storage space for the microphone, wiring for electrically connecting the microphone and the control board is provided on the outside of the first housing. It becomes possible. As a result, it is not necessary to provide a hole for wiring the microphone in the first housing for accommodating the speaker, and the assembling property is improved. Further, since the partition wall of the side wall recess of the first housing is formed with a communication hole for communicating the sound path space and the microphone accommodation space, processing is easy. In this way, we were able to provide earphones that are highly assembleable and can stabilize sound quality.

Another characteristic configuration is that a plurality of the communication holes are provided, and each of the plurality of communication holes is composed of a pressure adjusting hole and a sound collecting hole of the microphone.

If the communication hole is composed of a pressure adjusting hole in addition to the sound collecting hole of the microphone as in this configuration, the burden on the eardrum when the earphone is inserted into the ear canal can be reduced.

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

As in this configuration, if the wiring for electrically connecting the microphone and the control board is configured by the flexible board and the flexible board extends to the outside of the first housing, the assembling property is further improved.

Another characteristic configuration is that the flexible substrate is formed with through holes that overlap with the communication holes.

If a through hole overlapping the communication hole is formed in the flexible substrate as in this configuration, it is possible to easily form a minute through hole that is difficult to provide in the first housing, so that the sound for the sound path space can be heard. The effect on the characteristics can be minimized.

Another characteristic configuration further includes an intervening member arranged between the flexible substrate and the partition wall, and the intervening member is formed with a second through hole having the same shape as the communication hole and overlapping. At the point.

If an intervening member is provided 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 intervening member is provided with the second through hole having the same shape as the communication hole, 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. It is an exploded perspective view of an earphone. It is sectional drawing of an earphone. It is a perspective view which shows the arrangement state of the flexible substrate.

Hereinafter, embodiments of the earphones according to the present invention will be described with reference to the drawings. In the present embodiment, as an example of the earphone, the earphone 100 provided with the microphone 3 and canceling the noise by the feedback method will be described. 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 in the present embodiment is a canal type (earplug type) wireless earphone provided with an ear pad 10 made of an elastic material such as an elastomer that adheres to the ear canal. FIG. 1 shows one earphone 100 inserted into the right ear, and the other earphone 100 inserted into the left ear has a similar structure with left-right symmetry. Therefore, the following description will be omitted. Both earphones 100 are configured to enable short-range wireless communication with a device such as a mobile phone. The earphone 100 may be connected to the device by wire, or may be an inner ear type earphone, and is not particularly limited.

As shown in FIGS. 2 to 3, the earphone 100 includes a speaker 1, a first housing 2, a microphone 3, a second housing 4, and a control board 5. Further, the earphone 100 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 substrate 9 is made of a conductive metal material. Further, although the spacer 8 in the present 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 in a state of 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 a sound wave from the diaphragm 11. The speaker 1 has 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, 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 tubular shape that is formed on the side of the open end 21 with respect to the speaker 1 and extends from the open end 21 toward the speaker 1. It has a portion 22 (an example of a side wall) and a base portion 23 extending from the tubular portion 22 to form a speaker accommodating space 23a for accommodating the speaker 1.

The opening end portion 21 has an annular recess 21a, and a breathable acoustic register 24 covering the opening is fixed to the annular recess 21a. Further, on the outer surface of the open end portion 21, an engaging recess 21b with which the engaging convex portion 10a of the ear pad 10 is engaged is formed.

The end portion 21 communicates with the sound path space 2A formed inside the tubular portion 22, and the sound wave radiated from the speaker 1 passes through the sound path space 2A. The tubular portion 22 has a shape that expands outward in a trumpet shape from the opening end portion 21 toward the base portion 23, and has a side wall recess 25 having a part of the outer surface recessed inward. The side wall recesses 25 have a bottom 25a (an example of a partition wall) in which a plurality of elongated holes (two in this embodiment) first through holes 25a1 (an example of communication holes) are formed, and a first spacer 81 described later. The first side surface 25b in which the guide recess 25b1 to which the first protrusion 81b of the above is engaged and guided is formed, and the first side surface 25b is inclined so as to decrease in height from both sides toward the opening end portion 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 opening end 21 (see FIG. 2). That is, the bottom portion 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 the microphone accommodating space 3A described later (see FIG. 3). The plurality of first through holes 25a1 formed in the bottom 25a communicate the sound path space 2A and the microphone accommodating space 3A, and the first through holes 25a1 located near the center of the bottom 25a are a collection of microphones 3. 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 adjusting hole 27. The partition wall 44 of the second housing 4 described later faces the first side surface 25b, and the side wall portion 42 of the second housing 4 described later faces the second side surface 25c, and faces the third side surface 25d. 2 faces the connection wall 43 of the second housing 4, which will be described later (see FIGS. 2 to 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. It is arranged (see FIG. 3). The microphone 3 can collect ambient noise and also the voice of a person wearing the earphone 100. The microphone 3 transmits the sound signal generated by collecting the sound of the sound path space 2A through the sound collecting hole 26 and also collecting the ambient noise to the control board 5, and the control board 5 transmits the sound signal. It is configured to output a noise canceling signal whose phase is inverted to the speaker 1. Since the feedback type noise canceling mechanism and the calling mechanism of the microphone 3 are known, detailed description thereof will be omitted.

The second housing 4 covers the microphone 3. The second housing 4 has a top wall 41 that covers the upper side of the side wall recess 25 of the first housing 2, a pair of side wall portions 42 that are erected from the top wall 41 and inserted into the side wall recess 25, and a pair of side wall portions 42. Connection wall 43 for connecting the tip end portion (end portion of the first housing 2 on the open end portion 21 side) and the base end portion of the pair of side wall portions 42 (end portion of the first housing 2 on the base portion 23 side). It has a partition wall 44 and a partition wall 44 for connecting the above (see FIG. 2). By fitting the second housing 4 into the side wall recess 25, the top wall 41, a pair of side wall portions 42, the connecting wall 43, the partition wall 44, and the bottom portion 25a of the side wall recess 25 (strictly speaking, a flexible substrate) are further inserted into the side wall recess 25. A microphone accommodation space 3A (an example of the accommodation space) surrounded by 9) is formed. The microphone 3 is accommodated in the microphone accommodating space 3A (see FIG. 3). That is, the microphone accommodating space 3A is formed by covering the side wall recess 25 with the second housing 4.

The top wall 41 is smoothly connected to the outer shape of the tubular portion 22 in a state where the second housing 4 is fitted in the side wall recess 25, and is integrated with the tubular portion 22 to form a trumpet as it goes from the connection wall 43 to the partition wall 44. A main wall portion 41a that exhibits a shape that expands to the outer surface and forms a microphone accommodating space 3A inside, and an auxiliary wall portion 41b that extends from the main wall portion 41a and faces the base portion 23 of the first housing 2. It is configured. The pair of side wall portions 42 face each other of the pair of second side surfaces 25c of the first housing 2, and are inclined so as to decrease in height from the partition wall 44 toward the connection wall 43, similarly to the second side surface 25c. is doing. The connection wall 43 faces the third side surface 25d of the first housing 2, and a notch 43a for communicating the above-mentioned pressure adjusting hole 27 with the outside is formed. The cutout portion 43a may be a through hole.

The partition wall 44 stands upright from the vicinity of the center in the longitudinal direction of the top wall 41 and faces the first side surface 25b of the first housing 2. The pair of side wall portions 42, the connecting wall 43, and the partition wall 44 are configured as an upright portion that stands up from the top wall 41, and are fitted or adhered to the side surfaces 25b, 25c, 25d of the first housing 2. At the same time, the auxiliary wall portion 41b is adhered to the base portion 23 of the first housing 2 with the flexible substrate 9 sandwiched therein, so that the second housing 4 is fixed to the first housing 2.

The control board 5 has a control circuit that controls the operation of the speaker 1 and the microphone 3. This control circuit is composed of a wireless communication LSI, a voice data processing LSI, and the like, and power is supplied from a battery (not shown). Since the operating modes of the speaker 1 and the microphone 3 by the control board 5 are known, detailed description thereof will be omitted.

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

The spacer 8 is made of double-sided tape and has 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 portion 25a of the side wall recess 25, and the second spacer 82 is a pair of side wall portions 42 of the flexible substrate 9 and the second housing 4, a connecting wall 43, and the second spacer 82. It is arranged between the partition wall 44 and the partition wall 44. That is, the flexible substrate 9 is fixed in position by fixing the second housing 4 to the first housing 2 in a state where the flexible substrate 9 is sandwiched and adhered by the first spacer 81 and the second spacer 82.

The first spacer 81 is composed of a rectangular member, and the rectangular portion 81a and the first protruding portion 81b protruding from one side of the rectangular portion 81a are integrally formed. In the rectangular portion 81a, a plurality of (two in the present embodiment) second through holes 81a1 having the same shape as the first through hole 25a1 but slightly larger than the first through hole 25a1 are formed. There is. Each of the plurality of second through holes 81a1 overlaps with the plurality of first through holes 25a1, and the second through hole 81a1 located near the center of the rectangular portion 81a is used as a part of the sound collecting hole 26 of the microphone 3. The second through hole 81a1 located in the vicinity of the opening end portion 21 is configured as a part of the air pressure adjusting hole 27, respectively. The second spacer 82 is composed of a rectangular annular member having an open center, and the rectangular annular portion 82a and the 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 bonded to the outer surface of the base portion 23, and is bent narrower than the flat surface portion 83a extending from the vicinity of the center of the rectangular flat surface portion 83a and the flat surface portion 83a. The bent portion 83b is integrally formed. The fourth spacer 84 is made of a U-shaped member, and a pair of arm portions 84a provided at positions that do not interfere with the bent portion 83b and a connecting portion 84b connecting the pair of arm portions 84a are integrally formed. ing. A hole 84a1 into which a bolt B is inserted is formed in each arm portion 84a. In a state where the flexible substrate 9 is sandwiched and adhered by the third spacer 83 and the fourth spacer 84, the third housing 7 is attached to the first housing 2 by the bolt B inserted into the hole portion 84a1 of the fixing portion 73b and the arm portion 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 (a portion that does not interfere with the sound path space 2A). The flexible substrate 9 is formed on a rectangular plate-shaped base portion 91 to which the microphone 3 is electrically connected, an extension portion 92 extending from the base portion 91, and an end portion of the extension portion 92, and is formed on the control board 5. An electrically connected connection end portion 93 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 arranged in the center. A plurality of (two in this embodiment) third through holes 91a (an example of through holes) composed of minute round 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 the second through holes 81a1, respectively, and the third through hole 91a located near the center of the base 91 is the sound collecting hole 26 of the microphone 3. The third through hole 91a located near the opening end 21 is formed of a minute round hole having a diameter of about 0.5 mm as a part of the air pressure adjusting hole 27, and has a diameter of about 0.2 mm. It is composed of round holes. That is, the sound collecting 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 adjusting hole 27 is formed. It is composed of a first through hole 25a1, a second through hole 81a1 and a third through hole 91a located in the vicinity of the opening end 21 of the bottom 25a of the first housing 2. In the present embodiment, the sound quality of the sound wave passing through the sound path space 2A is improved by forming a plurality of third through holes 91a composed of minute round holes on the flexible substrate 9 that can be easily processed. be able to.

The extending portion 92 is bent along the side surface of the first extending portion 92a extending from the base portion 91 along the guide recess 25b1 of the side wall concave portion 25 and extending from the first extending portion 92a along the side surface of the base portion 23. From the second extending portion 92b extending from the second extending portion 92b, the third extending portion 92c bending and extending along the end face of the base portion 23 from the second extending portion 92b, and the third extending portion 92c. It has a fourth extending portion 92d that bends and extends toward the control substrate 5. The third extending portion 92c is formed with a central hole portion 92c1 in which a part of the bottom plate 14a of the frame 14 of the speaker 1 is exposed. The connection end portion 93 is formed as a leaf spring in which a plate-shaped member is bent in a wavy shape, and is configured so that the electrical connection between the flexible substrate 9 and the control substrate 5 is not cut by vibration.

The method for assembling the earphone 100 according to the above-described embodiment is as follows. As shown in FIG. 2, in a state where the base 91 of the flexible substrate 9 on which the first spacer 81 and the microphone 3 are mounted and the second spacer 82 are laminated in this order, the first spacer 81 and the second spacer 82 The protrusions 81b and 82b are inserted into the guide recesses 25b1 of the first housing 2, and then the second housing 4 is fixed to the side wall recesses 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 collecting hole 26 and the air pressure adjusting hole 27 of the microphone 3 are formed. The air pressure adjusting hole 27 is located outside the mounting portion of the microphone 3, whereby the sound path space 2A communicates with the outside through the notch 43a of the connecting wall 43 of the second housing 4, so that the earphone 100 can be used. It is possible to reduce the burden on the eardrum when it is inserted into the ear canal.

Further, in a state where the third spacer 83 is adhesively fixed to the side surface of the base portion 23, the third extending portion 92c and the fourth spacer 84 of the flexible substrate 9 are laminated in this order, and the fixing portion 73b of the third housing 7 is laminated. 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 accommodating the speaker 1. Then, the connection end portion 93 of the flexible substrate 9 is inserted through a through hole (not shown) of the third housing 7 to be electrically connected to the control substrate 5, and the bottom lid 70 is attached to the accommodating base 71 accommodating the control substrate 5 and the like. Fix it. After that, 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 arranged closer to the open end 21 of the first housing 2 than the speaker 1 as in the present embodiment, the microphone 3 is arranged on the ear side with respect to the sound wave radiated from the speaker 1. Therefore, the noise reduction effect is higher than that of the feedback method. In this feedback type earphone 100, the first housing 2 and the second housing 4 are provided, and the bottom portion 25a serving as a partition wall is provided in the side wall recess 25 of the first housing 2. As a result, the sound path space 2A through which the sound wave radiated from the speaker 1 passes and the microphone accommodation space 3A are formed in different spaces, so that the sound quality is stable. In the present embodiment, a pair of side wall portions 42, a connection wall 43, and a partition wall 44 standing upright from the top wall 41 of the second housing 4 in a side wall recess 25 in which the outer surface of the tubular portion 22 of the first housing 2 is recessed inward. By interpolating, the sound path space 2A and the microphone accommodating space 3A can be formed in different spaces, so that the assembly is easy.

Further, since the microphone accommodating space 3A is formed by covering the side wall recess 25 of the first housing 2 with the second housing 4, a flexible substrate 9 for electrically connecting the microphone 3 and the control substrate 5 is provided. It can be provided on the outside of the first housing 2. As a result, it is not necessary to provide a wiring hole in the first housing 2 accommodating the speaker 1, and the assembling property is improved. Further, since the wiring for electrically connecting the microphone 3 and the control board 5 is configured by the flexible board 9 and the flexible board 9 extends to the outside of the first housing 2, the assembling property is further improved. At this time, since the first spacer 81 is provided between the flexible substrate 9 and the bottom portion 25a of the side wall recess 25, the flexible substrate 9 is stably supported and the flexible substrate 9 is routed to the outside of the first housing 2. Becomes easier.

Further, since the first through hole 25a1 for communicating the sound path space 2A and the microphone accommodating space 3A is formed in the side wall recess 25 of the first housing 2, processing is easy. Further, if a long hole-shaped first through hole 25a1 is formed in the bottom portion 25a of the side wall recess 25 and a third through hole 91a overlapping the first through hole 25a1 is formed in the base 91 of the flexible substrate 9, the third through hole 91a is formed. Since the hole diameter of the hole 91a can be made very small, the sound path space 2A and the microphone accommodation space 3A can be communicated with each other 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) At least one of a pair of side wall portions 42, a connection wall 43, and a partition wall 44 as an upright portion erected from the top wall 41 of the second housing 4 in the above-described embodiment may be provided. , May be composed of only the top wall 41.
(2) The spacer 8 in the above-described embodiment 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 adjusting hole 27 in the above-described embodiment may be omitted and only the sound collecting hole 26 may be configured.
(3) In the above-described embodiment, the flexible substrate 9 is provided for connecting the microphone 3 and the control substrate 5, but the extending portion 92 may be configured by a conducting wire.

The present invention can be used for earphones equipped with a feedback 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 22: Cylindrical part (side wall)
25: Side wall recess 25a: Bottom (partition wall)
25a1: First through hole (communication hole)
26: Sound collecting hole 27: Atmospheric pressure adjusting hole 81: First spacer (intervening member)
81a1: Second through hole 91a: Third through hole (through hole)
100: Earphone

Claims (5)

A speaker that radiates sound waves and
A first housing that houses the speaker and has a sound path space through which sound waves radiated from the speaker pass, and an open end that communicates with the sound path space and can be inserted into the ear canal.
A microphone arranged on the side of the end of the opening and outside the sound path space with respect to the speaker.
The second housing that covers the microphone and
A control board for controlling the operation of the speaker and the microphone is provided.
The first housing has a side wall formed on the side of the open end portion of the speaker, and a side wall recess formed by recessing a part of the outer surface of the side wall inward.
The microphone accommodating space is formed by covering the side wall recess with the second housing.
A partition wall for partitioning the sound path space and the accommodation space is formed in the side wall recess, and a communication hole for communicating the sound path space and the accommodation space is formed in the partition wall. earphone. A plurality of the communication holes are provided, and the communication holes are provided.
The earphone according to claim 1, wherein the plurality of communication holes are each composed of an air pressure adjusting hole and a sound collecting hole of the microphone. The microphone has a flexible substrate that is electrically connected to the control substrate.
The earphone according to claim 1 or 2, wherein the flexible substrate extends to the outside of the first housing. The earphone according to claim 3, wherein a through hole overlapping the communication hole is formed in the flexible substrate. Further, an intervening member arranged between the flexible substrate and the partition wall is provided.
The earphone according to claim 4, wherein the intervening member is formed with a second through hole that has the same shape as the communication hole and overlaps with the communication hole.

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