JP7361428B2 - earphone - Google Patents

Description

TECHNICAL FIELD The present invention relates to earphones, and particularly to wireless earphones that acquire biological signals.

The oscillometric method has been known as a blood pressure measurement method. In the oscillometric method, a cuff is wrapped around the upper arm or wrist, compressing the blood vessels, temporarily stopping the flow of blood, and then loosening the cuff pressure to reduce the pressure, synchronizing with the heartbeat. Blood pressure is measured based on cuff pressure that reflects the vibrations of the blood vessel wall.

However, in the conventional oscillometric method, it is necessary to wrap a cuff around the upper arm or wrist of the subject, and the tightening pressure of the cuff on the upper arm or wrist places a large burden on the subject, and continuous blood pressure measurement is required. The problem was that it was difficult.

Therefore, Patent Document 3 includes an insertion section that is attached to the outer ear of a subject, and a sensor that is placed within the insertion section and detects biological data of the subject, and the insertion section is equipped with a Disclosed is a biometric data measuring device characterized in that the biometric data measuring device is formed into a shape that follows the shape of the concha cavity and the external auditory canal (external auditory canal) of the subject based on three-dimensional data of the shape of the external ear of the subject. ing.

However, this biological data measuring device needs to be shaped into a shape that follows the shape of the concha cavity and the shape of the external auditory canal of the subject based on three-dimensional data of the shape of the subject's external ear. It is necessary to measure and mold the external ear shape of each subject, which is complicated.

Japanese Patent Application Publication No. 2006-102257 Japanese Patent Application Publication No. 2006-102258 JP2020-069272A

The present invention provides an earphone that can be stably attached to the ear and continuously acquire biological signals even when exercising or wearing it for a long time. An object of the present invention is to provide a device for each wearer (subject) without going through the complicated molding process of measuring and molding the shape of the auricular foramen cavity and outer ear of the wearer.

The earphone according to the present invention includes:
a sound conduit extending in a uniaxial direction;
a speaker that outputs sound in a uniaxial direction arranged on the base end side of the sound conduit;
a microphone that senses vibrations and is placed on the back side of the speaker with respect to the sound pipe and is spaced apart from the speaker;
a wireless communication board arranged on the back side of the microphone with respect to the sound conduit;
A front part that is connected to the base end of the sound pipe and has an inclined surface that is inclined with respect to the uniaxial direction and an annular base end that extends in a direction perpendicular to the uniaxial direction and accommodates the speaker; A housing includes a connecting part that accommodates and supports a microphone that is connected to the back side of the front part, and a rear part that is connected to the back side of the connecting part with respect to the sound pipe and that houses a wireless communication board. It is characterized by

According to this feature, even when wearing earphones while exercising or wearing them for a long time, it is possible to stably attach them to the ear and continuously acquire biological signals. Earphones that acquire biological signals can be provided without going through a complicated molding process.

The earphone according to the present invention is characterized in that it further includes a plurality of electrodes arranged around the speaker and housed in the base end of the front part.

According to this feature, biological signals can be acquired as electrical signals.

The earphone according to the present invention is characterized in that it further includes a ring body that is removably fitted to the outside of the base end.

According to this feature, even when wearing earphones while exercising or wearing them for a long period of time, it is possible to securely attach them to the ear and continuously acquire biological signals. Furthermore, earphones for acquiring biological signals can be easily provided without going through a complicated molding process.

The earphone according to the present invention is characterized in that the earphone further includes a ring body that is removably fitted to the outside of the base end, and the ring body has the plurality of electrodes on the inner surface.

According to this feature, biological signals can be reliably acquired as electrical signals.

The ring body of the earphone according to the present invention is characterized by having a ring protrusion projecting outward in a convex shape.

According to this feature, earphones can be provided without going through a complicated molding process that involves measuring and molding the shape of the wearer's outer ear for each wearer, and also improves the fit when the earphones are worn. At the same time, it can be securely and stably attached to the ear.

The ring body of the earphone according to the present invention is characterized in that it is an elastic body.

According to this feature, it is possible to further improve the fit when wearing the earphones, and to ensure that the earphones are stably attached to the ears.

The ring body of the earphone according to the present invention is characterized by having a plurality of electrically conductive parts that are divided by an insulating part and respectively connected to the plurality of front electrodes.

According to this feature, biological signals of the subject can be acquired more reliably.

One of the conductive parts of the ring body of the earphone according to the present invention is characterized in that it has an arc-shaped part that protrudes in an arc shape.

According to this feature, when wearing the earphone, the arcuate portion can be attached to the tragus of the ear, and the earphone can be stably worn.

Another one of the conductive parts of the ring body of the earphone according to the present invention is characterized in that it has an extension part extending from the conductive part.

By attaching the tip of the extension to the forehead, brain waves can be acquired.

The inclined surface of the earphone of the present invention is characterized in that it is inclined at an angle of 25 to 35 degrees with respect to the orthogonal direction and is formed in a concave shape.

According to this feature, when the earphone is worn in the ear, the inclined surface comes into contact with the inner surface of the concha cavity, so that the earphone can be stably worn.

The front part of the earphone according to the present invention has a shape eccentric to one side in a direction orthogonal to the uniaxial direction from the base end of the sound conduit when viewed from one side in the uniaxial direction to the other side,
The rear portion is characterized by having a shape whose major axis is a direction perpendicular to the uniaxial direction when viewed from one side in the uniaxial direction to the other side.

According to this feature, since the speaker is housed in the swollen front part, the speaker can be enlarged and directed in the same direction as the sound pipe, resulting in good sound quality.

The rear part of the earphone according to the present invention connects a speaker, a microphone, a microphone board arranged on the back side of the microphone with respect to the sound pipe, and a wireless communication board, and connects the power supply to the microphone board and the wireless communication board. It is characterized by being accommodated between the substrate and the substrate.

According to this feature, a microphone for acquiring biological signals and a wireless communication board (which may include a power source) for receiving audio signals by wireless communication can be housed in the rear part.

The rear part of the earphone according to the present invention is characterized in that it has an operation screen on the back side with respect to the sound pipe.

According to this feature, a large operation screen can be provided on the back of the rear part.

Earphones according to the present invention can be stably worn in the ear and continuously acquire biosignals even when exercising or wearing them for a long period of time. It is possible to provide earphones for each patient without going through a complicated molding process of measuring and molding the shape of the external ear of the patient.

FIG. 1 is an external view of an earphone according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the earphone according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the front part of the earphone according to the first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of an earphone according to a second embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of the front part of the earphone according to the second embodiment of the present invention. FIG. 6 is a schematic diagram of the earphone according to the embodiment of the present invention worn on the ear, viewed from the outside. FIG. 7 is a schematic cross-sectional view of a cross section including the external ear canal when the earphone according to the embodiment of the present invention is worn in the ear.

A first embodiment of the present invention will be described below.

FIG. 1 shows an external view of an earphone 1 according to an embodiment of the present invention. (A) is a plan view, (B) is a left side view, (C) is a front view, and (D) is a right side view. Further, FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG. 1(A) showing the internal configuration of the earphone 1. The axial direction of the sound guide tube 3 perpendicular to the base end portion 23 is defined as the Z-axis direction, and the mutually orthogonal directions perpendicular to the Z-axis within the plane constituting the base end portion 23 are defined as the X-axis and Y-axis directions.

The earphone 1 is for the left ear, and includes a sound conduit 3, a housing 2, a speaker 41, a microphone 42, and a wireless communication board 54. Note that the earphone 1 for the right ear is symmetrical in the X-axis direction with respect to the earphone 1 for the left ear.

The sound pipe 3 is a tubular member that transmits sound output from the speaker 41. The sound guide tube 3 is formed into a cylindrical shape using, for example, thermoplastic resin. The inner radius of the hollow portion is, for example, 3 mm or more. Note that an earpiece (not shown) molded from silicone rubber or the like may be provided at the tip of the sound guide tube 3. As a result, when the sound pipe 3 is inserted into the external ear hole 74, the earpiece (not shown) deforms and fits into the hole, thereby supporting the sound pipe 3 while maintaining the inside of the external ear hole 74 airtight. can.

The housing 2 is a case that accommodates the speaker 41, the microphone 42, the microphone board 43, the power supply 51, the main board 52, and the wireless communication board 54, and has a front part 21, a connecting part 26, and a rear part 28. The front part 21 is connected to the rear part 28 via a connecting part 26. Moreover, the front part 21, the connecting part 26, and the rear part 28 can be integrally molded including the sound pipe 3 from the same material as the sound pipe 3.

The front portion 21 is a portion that supports the base end of the sound pipe 3 and accommodates the speaker 41. The front part 21 has, on its outer surface, an inclined surface 22 that is inclined with respect to the Z-axis direction (or the X-axis direction perpendicular to this), and through which the front part 21 bulges from the base end of the sound pipe 3 toward the −X side. However, it is formed into an eccentric truncated cone shape that bulges out slightly on the +X side, and has an annular base end 23 that expands in the XY plane. Thereby, the speaker 41 can be housed in the front part 21 in close proximity to the sound pipe 3, and the front part 21 can be housed in the auricular foramen cavity 72 without interfering with the tragus 71. Further, the sound pipe 3 is inclined at an angle φ of, for example, 25 to 35 degrees, preferably about 30 degrees with respect to the Z-axis direction, and the inclined surface 22 is inclined at an angle φ of, for example, 25 to 35 degrees, preferably about 30 degrees with respect to the X-axis direction. It is inclined at an angle θ of about 30 degrees and is formed in a concave shape. Thereby, when the earphone 1 is attached to the ear 7, the inclined surface 22 is brought into contact with the inner surface of the concha cavity 72, and the sound guide tube 3 can be directed toward the external ear canal 74 and inserted therein.

The speaker 41 is a device that outputs sound. Since the front part 21 bulges toward the X side from the base end of the sound pipe 3, the speaker 41 can be large. The speaker 41 uses a voice coil, a piezoelectric element, etc. to vibrate a diaphragm oriented in one axis direction (in this case, the Z-axis direction) according to an electrical signal input from the outside, so that the center of the speaker 41 (i.e., the diaphragm) is vibrated. The sound is emitted along a central axis parallel to the Z-axis passing through (see Figure 7). Note that the speaker 41 is housed in the front portion 21 at the proximal end of the sound guide tube 3 in the Z-axis direction and offset toward the X side with respect to the sound guide tube 3, so that the housing 2 is reliably attached to the tragus 71 and navicular fossa 73.

Note that it is preferable to provide the air hole 29 on the side of the sound guide tube 3 rather than the speaker 41 of the housing 2 (or the sound guide tube 3). A closed space is formed by the housing 2, the sound conduit 3, the external ear hole 74, and the eardrum. The air pressure in this space can be higher than the outside air pressure. In that case, the characteristics of the sound transmitted within this space may change. This is to prevent such changes in characteristics. In this embodiment, the air holes 29 are provided in the inclined surface 22.

FIG. 3 is a schematic sectional view taken along the line BB in FIG. 1(C) of the front portion 21 showing the ring body 24 fitted to the base end portion 23. As shown in FIG. An annular ring body 24 made of an elastic body is removably fitted to the outer periphery of the base end portion 23, which improves the fit when the earphone 1 is worn and allows it to be stably attached to the ear 7. It is said that FIG. 3(A) shows a ring protrusion 25 that protrudes outward from about 1/4 of the circumference of the ring body 24. As shown in FIG. Depending on the shape (size) of the ear 7 of the person wearing the earphone 1, the ring body 24 with the protruding ring protrusion 25 having different heights is fitted to the base end 23, thereby making the earphone 1 stable. It is possible to install it. In addition, when wearing on a small ear 7, the ring body 24 without the ring protrusion 25 may be fitted to the base end portion 23.

FIG. 3B shows an arcuate portion 64 of the ring body 24 that protrudes in an arc shape at a portion of the ring body 24 that is in contact with the tragus 71 of the ear. By attaching the arcuate portion 64 to the tragus 71, it is possible to attach the ear more stably and to more reliably acquire biological signals from the tragus 71, which is preferable.

The connecting portion 26 connects the front portion 21 and the rear portion 28, and accommodates and supports the microphone 42. The microphone 42 is placed apart from the speaker 41 so as not to pick up vibrations from the speaker 41. The microphone 42 detects vibrations of the carotid artery wall that are synchronized with the heartbeat, which are transmitted to the surrounding area of the ear 7, particularly the tragus 71, as pulse wave sound, converts the pulse wave sound into an electrical signal, and transmits the vibration to the microphone 42. The signal is transmitted to the microphone board 43 located on the back side of the . Note that the microphone 42 only needs to be able to reliably sense pulse wave sound, and is not limited to the connecting part 26, but may be housed and supported in the rear part 28, for example.

On the other hand, the rear part 28 is a part that accommodates the microphone board 43, the power supply 51, the main board 52, and the wireless communication board 54 on the -Z side of the connecting part 26. The rear part 28 has a circular upper end (in the Y-axis direction) with the long axis direction in the Y-axis direction when viewed from one side in the uniaxial direction (Z-axis direction) to the other side (from the sound pipe 3 side to the rear part 28). It has a substantially rectangular shape. The front part 21 is located at a position approximately 1/4 downward (in the -Y axis direction) from the upper end of the rear part 28 via the connecting part 26, and is located -X from the center line in the longitudinal direction of the rear part 28. The base end portion 23 is disposed at a position offset from the base end portion 23 by about 1/4 of the diameter of the base end portion 23 in the axial direction. The rear portion 28 exposes and supports an operation screen (not shown) such as a touch panel or an operation switch (not shown) on the back side with respect to the sound pipe 3, that is, on the −Z plane. Thereby, a large operation screen (not shown) can be provided on the housing 2.

The microphone 42 is a device that inputs pulse waves as an acoustic signal. The microphone 42 receives the vibration of the carotid artery wall synchronized with the heartbeat as a pulse wave transmitted from the tragus 71 via the ring body 24, the front part 21, and the connecting part 26 using a pressure-sensitive element, a piezoelectric element, etc. Then, the signal is converted into an electric signal and output as an electric signal to the outside via the microphone board 43. In addition to the microphone 42, it is also possible to arrange a sensor such as an optical heart rate sensor or a thermometer on the connecting portion 26 or the front portion 21 to measure core body temperature and oxygen saturation.

The microphone board 43 is a board provided with a control circuit that converts the biological signals acquired by the microphone 42, the electrodes 61, and each sensor into electrical signals and transmits them to the wireless communication board 54.

The power supply 51 is a power supply 51 that supplies power to the speaker 41 , microphone 42 , microphone board 43 , main board 52 , and wireless communication board 54 . The power supply 51 is disposed within the housing 2 between the microphone board 43 and the main board 52, and is housed within the rear portion 28. Note that the power source 51 may be housed in the front section 21 or the connecting section 26, or may be housed across the front section 21, the connecting section 26, and the rear section 28. Thereby, a large power source 51 can be provided in the space between the speaker 41 and the main board 52, and the speaker 41, microphone 42, and other biosignal sensors can be used for a long time.

The main board 52 is a board provided with a control circuit that controls the speaker 41, the microphone 42, the microphone board 43, the wireless communication board 54, and the power supply 51 housed in the housing 2.

The wireless communication board 54 receives audio signals from an external device (not shown) through wireless communication such as Bluetooth (registered trademark) and drives the speaker 41, and also receives audio signals related to biological signals transmitted from the microphone board 43. This is a board provided with a control circuit that transmits information to an external device (not shown) via wireless communication. The wireless communication board 54 is disposed on the back side of the speaker 41 and the power source 51 with respect to the sound guide tube 3, and is housed in the rear section 28. The wireless communication board 54 supplies power to an operation screen (not shown) through non-contact power supply, and also controls biological signal sensors such as the speaker 41 and the microphone 42 by operations input by the user via the operation screen (not shown). . Note that power supply to the power source 51 is not limited to non-contact power supply, and may be wired power supply via a USB connector (not shown) provided in the rear section 28, for example.

Next, an earphone 1 according to a second embodiment of the present invention will be described. Note that only the different parts between the first embodiment and the second embodiment of the present invention will be explained, and the explanation of the same points as the first embodiment will be omitted.

FIG. 4 is a schematic cross-sectional view taken along the line AA in FIG. 1(A) showing the internal configuration of the earphone 1 according to the second embodiment of the present invention. The earphone 1 is for the left ear, and includes a sound conduit 3, a housing 2, a speaker 41, a microphone 42, an electrode 61, and a wireless communication board 54. Note that the earphone 1 for the right ear is symmetrical in the X-axis direction with respect to the earphone 1 for the left ear.

The housing 2 is a case that accommodates a speaker 41, a microphone 42, a microphone board 43, a power supply 51, a main board 52, a brain wave analysis chip 53, a wireless communication board 54, and an electrode 61, and includes a front part 21, a connecting part 26 and a rear portion 28. The front part 21 is connected to the rear part 28 via a connecting part 26.

The front portion 21 is a portion that supports the base end of the sound pipe 3 and accommodates the speaker 41. The front part 21 has, on its outer surface, an inclined surface 22 that is inclined with respect to the Z-axis direction (or the X-axis direction perpendicular to this), and through which the front part 21 bulges from the base end of the sound pipe 3 toward the −X side. However, it is formed into an eccentric truncated cone shape that bulges out slightly on the +X side, and has an annular base end 23 that expands in the XY plane.

FIG. 5 is a schematic sectional view taken along line BB in FIG. 1(C) of the front part 21 showing the ring body 24 removably fitted to the base end part 23 of the earphone 1 according to the second embodiment. .

A plurality of electrodes 61 for acquiring biological signals are arranged around the speaker 41 in the base end portion 23 . FIG. 5 shows, as an example, a state in which three electrodes 61 are arranged.

A first electrode 611 is placed at a position where the proximal end 23 contacts the tragus 71, and a second electrode 612 as a ground is placed at a position where the proximal end 23 contacts the skin on the navicular fossa 73 side. The pulse wave is acquired from 71 as an electrical signal. Further, above the base end portion 23 (in the Y-axis direction), a third electrode 613 for acquiring biological signals related to brain waves is arranged. Note that when acquiring only pulse waves or only brain waves, a pair of electrodes 61 (first and second electrodes 611, 612, or third and second electrodes 613, 612) is sufficient.

On the other hand, an annular ring body 24 is removably fitted to the base end portion 23 . The ring body 24 is made of a conductive elastic body, and is divided into a plurality of conductive parts 62 by an insulating part 63, and each conductive part 62 transmits a biological signal acquired as an electric signal to a corresponding electrode 61. do. If the ring body 24 is conductive, it can come into contact with a wide range of skin around the ear 7 and more reliably acquire biological signals as electrical signals.

Further, an extension part 65 may be provided that extends above the ring body 24 (in the Y-axis direction) and whose tip is attached to the forehead to acquire brain waves. The extension portion 65 may be formed integrally with the ring body 24, or may be formed as a single extension portion 65 separately from the ring body 24, and the ring body 24 and the extension portion 65 may be connected via a connector (not shown). may be connected.

Note that as long as the electrode 61 can reliably detect biological signals, the ring body 24 does not need to be fitted to the base end 23; for example, the electrode 61 may be arranged so as to be in direct contact with the skin. It's okay.

The electrode 61 is a plate-shaped or rod-shaped conductor made of metal, alloy, graphite, semiconductor, metal oxide, or the like.

On the other hand, the rear part 28 accommodates a microphone board 43, a power supply 51, a main board 52, an electroencephalogram analysis chip 53, and a wireless communication board 54 on the -Z side of the connecting part 26. The brain wave analysis chip 53 is a circuit that analyzes brain waves acquired via the electrodes 61.

The first electrode 611 acquires the vibration of the carotid artery wall synchronized with the heartbeat as an electric signal from the pulse wave transmitted from the tragus 71 via the conductive part 62 of the ring body 24, and connects the microphone board 43 and the main board. The signal is output from the wireless communication board 54 to an external device via the wireless communication board 52 .

On the other hand, brain waves, which are electrical signals from the brain, are acquired as electrical signals from the periphery of the ear 7 by the third electrode 613 via the conductive part 62. The acquired electrical signals are then transmitted to the brain wave analysis chip 53 via the main board 52, analyzed as brain waves, and output from the wireless communication board 54 to an external device.

Next, a method for attaching the earphone 1 according to the embodiment of the present invention to the ear 7 will be described. FIG. 6 is a diagram showing a state in which the earphone 1 is worn as seen from the outside, and FIG. 7 is a diagram showing a cross section including the external ear hole 74 in a state in which the earphone 1 is worn. Insert the front part 21 into the concha cavity 72 with the X end of the front part 21 facing the scaphoid fossa 73 side and the -X end of the base end 23 facing the tragus 71 side, and insert the front part 21 into the concha cavity 72 so that the inclined surface 22 is placed in the concha cavity 72. The sound guide tube 3 is inserted into the external ear hole 74 while coming into contact with the inner surface of the cavity 72 .

The −X end of the proximal end portion 23 from the base end of the sound guide tube 3 is supported by the back side of the tragus 71, and the X end portion of the front portion 21 is supported by the concha cavity 72.

Since the rear part 28 is placed very close to the tragus of the ear 71 and extends downward (in the -Y axis direction), it is not limited in size by the tragus of the ear 71 and the navicular fossa 73, and can be mounted on a large main board. 52 and a wireless communication board 54.

The rear part 28 that houses the wireless communication board 54 and the power supply 51 has a large mass and is subjected to gravity downward in FIG. However, the moment when the earphone 1 falls off from the ear 7 does not occur.

As described above, the earphone 1 can be stably attached to the ear 7, and even when the wearer moves violently, the earphone 1 can be stably attached. Does not cause discomfort.

Next, a possible usage method of the earphone 1 according to the embodiment of the present invention will be described.

A driver of a truck or bus that travels long distances wears the earphone 1 according to the present invention, activates the earphone 1, and then starts driving the truck or the like. The earphone 1 sequentially outputs biological signals such as pulse waves or brain waves acquired from the microphone 42 or the electrodes 61 from the wireless communication board 54, and these biological signals are transmitted to a smartphone (not shown) placed near the earphone 1. The data is transmitted to a host computer (not shown) via a communication device such as . A host computer (not shown) analyzes and records the received biological signals and determines the physical condition and mental state of the driver. When the host computer (not shown) detects fatigue or abnormality of the driver (for example, when the driver senses danger and becomes agitated), the host computer (not shown) sends a signal to the wireless communication board 54 via the communication device (not shown). is transmitted, and an audio signal is output from the speaker 41 via the main board 52 to urge the driver to take a rest or be careful.

The earphone 1 according to the present invention is also expected to be used to manage the physical condition of workers who work alone or operate equipment, workers who work in poor working environments with high temperatures and noise, and the like.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the range described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the embodiments described above. It is clear from the claims that such modifications or improvements may be included within the technical scope of the present invention.

Possibility of industrial use

Earphones that can be stably attached to the ear and continuously acquire biological signals, even when exercising or wearing them for long periods of time. It can be provided without going through a complicated molding process of measuring and molding the external ear shape of each subject. It is expected that it will be used for continuous acquisition of biological signals.

1 Earphone 2 Housing 3 Sound conduit 7 Ear 21 Front part 22 Inclined surface 23 Base end part 24 Ring body 25 Ring protrusion 26 Connecting part 28 Rear part 29 Air hole 41 Speaker 42 Microphone 43 Microphone board 51 Power supply 52 Main board 53 Brain wave analysis chip 54 wireless communication board 61 electrode 611 first electrode 612 second electrode 613 third electrode 62 conductive part 63 insulating part 64 arcuate part 65 extension part 71 tragus 72 foraural cavity 73 scaphoid fossa 74 external auditory foramen

Claims (10)

a sound conduit extending in a uniaxial direction;
a speaker that outputs sound in the uniaxial direction and is disposed on the proximal end side of the sound conduit;
a microphone that senses vibrations and is arranged on the back side of the speaker with respect to the sound pipe and separated from the speaker;
a wireless communication board arranged on the back side of the microphone with respect to the sound pipe;
a front portion connected to a base end of the sound pipe and having an inclined surface inclined with respect to the uniaxial direction and an annular base end portion extending in a direction perpendicular to the uniaxial direction and accommodating the speaker; a connecting part that is connected to the rear side of the front part with respect to the sound guide tube and accommodates and supports the microphone; and a rear part that is connected to the rear side of the connector part with respect to the sound guide tube and accommodates the wireless communication board. , a housing having a
Further comprising a plurality of electrodes disposed around the speaker and housed in a base end of the front part, and a ring body removably fitted outside the base end, the ring body being arranged on an inner surface of the front part. An earphone comprising the plurality of electrodes . The earphone according to claim 1 , wherein the ring body has a ring protrusion that protrudes outward. The earphone according to claim 1 or 2 , wherein the ring body is an elastic body. 4. The ring body according to claim 1, wherein the ring body is divided by an insulating part and has a plurality of conductive parts each connected to the plurality of electrodes. earphone. The earphone according to claim 4 , wherein one of the conductive parts has an arcuate part projecting in an arcuate shape. 6. The earphone according to claim 4 , wherein another one of the conductive parts has an extension part extending from the conductive part. The earphone according to any one of claims 1 to 6 , wherein the inclined surface is inclined at an angle of 25 to 35 degrees with respect to the orthogonal direction and is formed in a concave shape. The front portion has a shape eccentric to one side in a direction perpendicular to the uniaxial direction from the base end of the sound conduit when viewed from one side in the uniaxial direction to the other side,
Any one of claims 1 to 7 , wherein the rear portion has a shape whose major axis is a direction perpendicular to the uniaxial direction when viewed from one side to the other side in the uniaxial direction. Earphones listed in. The rear section connects a power source that supplies power to the speaker, the microphone, a microphone board disposed on the back side of the microphone with respect to the sound pipe, and the wireless communication board to the microphone board and the wireless communication board. The earphone according to any one of claims 1 to 8 , wherein the earphone is housed between the earphone and a wireless communication board. The earphone according to any one of claims 1 to 9 , wherein the rear part has an operation screen on the back side with respect to the sound guide tube.

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