JP6778915B2 - Bone conduction microphone, bone conduction microphone set and helmet - Google Patents

Description

The present disclosure relates to a bone conduction microphone that contacts the human body to acquire vocal cord vibration, a bone conduction microphone set including the bone conduction microphone, and a helmet.

Patent Document 1 discloses a bone conduction microphone that is attached to the jaw strap of a helmet and used when a motorcycle is running. In this bone conduction microphone, in order to reduce mixing of ambient noise, engine noise, wind noise, etc. during running, the bone conduction microphone is placed on the jaw and vocal cord vibration is acquired from the jaw.

Jitsukaisho 60-89229

The present disclosure provides a bone conduction microphone or the like effective for acquiring vocal cord vibration.

The bone conduction microphone in the present disclosure is a voice band sensor that detects voice band vibration emitted from a human body and vibration including noise vibration different from the voice band vibration, and a noise sensor that detects the noise vibration, and is detected by the voice band sensor. A noise sensor used to cancel the noise vibration from the vibration, and a vibration acquisition that supports the voice band sensor, acquires the vibration by contacting the human body, and transmits the acquired vibration to the voice band sensor. A vibration acquisition unit and a housing that supports each of the vibration acquisition unit and the noise sensor are provided. The vibration acquisition unit has a tubular shape, and a side surface portion and a plate portion provided on one end side of the side surface portion. The housing is tubular and has a base portion provided on one end side of the cylinder and a contact portion provided on the other end side, and the housing is directed from the base portion to the other end side. The plate portion of the vibration acquisition portion is supported by the strut portion of the housing, and the voice band sensor is provided on the inner wall of the contact portion of the vibration acquisition portion. The noise sensor is provided on the inner wall of the base portion of the housing.
The helmet in the present disclosure includes a helmet body and the bone conduction microphone attached to the jaw strap of the helmet body.
The bone conduction microphone in the present disclosure is a voice band sensor that detects voice band vibration emitted from a human body and vibration including noise vibration different from the voice band vibration, and a noise sensor that detects the noise vibration, and is detected by the voice band sensor. A noise sensor used to cancel the noise vibration from the vibration, and a vibration acquisition that supports the voice band sensor, acquires the vibration by contacting the human body, and transmits the acquired vibration to the voice band sensor. A unit, a housing that supports each of the vibration acquisition unit and the noise sensor, and a housing provided inside the housing, and when the human body and the vibration acquisition unit come into contact with each other, the human body and the vibration acquisition unit are provided. It is provided with a contact state sensor that detects the contact state with.
The bone conduction microphone set in the present disclosure includes the bone conduction microphone, a notification unit for notifying the contact state, and the notification unit when the value detected by the contact state sensor does not reach a predetermined threshold value. It is provided with a control unit for operating the above.
The helmet in the present disclosure includes a helmet body and the bone conduction microphone, and the helmet body reaches a predetermined threshold value with a notification unit for notifying the contact state and a value detected by the contact state sensor. When not, the bone conduction microphone has a control unit for operating the notification unit, and the bone conduction microphone is attached to the jaw cord of the helmet body.

The bone conduction microphone of the present disclosure is effective in acquiring vocal cord vibration.

A perspective view showing a helmet including a bone conduction microphone according to the first embodiment. The figure which shows the usage mode of the bone conduction microphone and the helmet in Embodiment 1. Cross-sectional perspective view of the bone conduction microphone according to the first embodiment A block diagram showing a control configuration of a helmet according to the first embodiment. A perspective view showing a helmet including a bone conduction microphone according to a second embodiment. Cross-sectional perspective view of the bone conduction microphone according to the second embodiment 2 is a cross-sectional view of the bone conduction microphone according to the second embodiment, in which FIG. 2A shows a case where the contact state between the human body and the bone conduction microphone is not detected, and FIG. A block diagram showing a control configuration of a helmet according to a second embodiment. The figure which shows the use method of the helmet in Embodiment 2.

The bone conduction microphone of the present disclosure is used when talking to a remote party using wireless communication in a noisy environment. The bone conduction microphone acquires vocal cord vibration by pressing a part of the bone conduction microphone against the jaw or throat. For example, in a noisy environment such as when traveling on a motorcycle, engine vibration and road noise vibration may travel through the human body and enter the bone conduction microphone. The bone conduction microphone of the present disclosure has the following configuration so that vocal cord vibration can be effectively acquired even in a noisy environment.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art.

It should be noted that those skilled in the art will provide the accompanying drawings and the following description in order to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 4.

[1-1. Bone conduction microphone and helmet configuration]
FIG. 1 is a perspective view showing a helmet 2 including a bone conduction microphone 1 according to the first embodiment. FIG. 2 is a diagram showing a usage mode of the bone conduction microphone 1 and the helmet 2.

As shown in FIGS. 1 and 2, the helmet 2 includes a bone conduction microphone 1 and a helmet body 50. The helmet body 50 includes a control unit 55 and a pair of speakers 51 connected to the control unit 55. The bone conduction microphone 1 is connected to the control unit 55 of the helmet body 50 via the microphone cable 4.

The helmet body 50 is provided with a belt-shaped jaw strap 3 for fixing the helmet body 50 to the head. The bone conduction microphone 1 is attached to the jaw strap 3 using the fastener 26. A buckle 5 is attached to the chin strap 3. The helmet body 50 is fixed to the head by engaging the insertion fitting 5b of the buckle 5 with the bracket 5a. Further, by engaging the insertion bracket 5b and the bracket 5a, the vibration acquisition portion 10 which is a part of the bone conduction microphone 1 comes into contact with the jaw or the throat, and the bone conduction microphone 1 is in a state where it can acquire vocal cord vibration. ..

FIG. 3 is a cross-sectional perspective view of the bone conduction microphone 1.

As shown in FIG. 3, the bone conduction microphone 1 includes a vocal cord sensor 11, a noise sensor 28, a housing 21, and a vibration acquisition unit 10 that transmits vibration acquired in contact with the human body to the vocal cord sensor 11. ..

First, the vocal cord sensor 11 and the vibration acquisition unit 10 will be described.

The vocal cord sensor 11 is, for example, a flat plate-shaped piezoelectric element that performs thickness vibration, and detects vibration transmitted from the vibration acquisition unit 10. The vibration detected by the vocal cord sensor 11 is a composite vibration including a vocal cord vibration emitted from the human body and a noise vibration different from the vocal cord vibration. The noise vibration is, for example, the vibration of the engine and the vibration of the road noise when the motorcycle is running (see FIG. 2). The noise vibration input to the bone conduction microphone 1 is canceled by using the detection result of the noise sensor 28 from the vibration detected by the vocal cord sensor 11.

The vibration acquisition unit 10 includes a contact member 12 that comes into contact with the human body and a plate unit 13 provided on the lower side (minus side in the Z direction) of the contact member 12.

The contact member 12 is a member that comes into contact with the human body and acquires vibration. The contact member 12 has a cylindrical shape, and has a side surface portion 12b, an opening portion 12c having an opening at one end of the side surface portion 12b, and a contact portion 12a provided at the other end of the side surface portion 12b and in contact with the human body. Be prepared. In FIG. 3, the contact portion 12a is provided on the Z-direction plus side of the side surface portion 12b, and the opening portion 12c is provided on the Z-direction minus side of the side surface portion 12b. The vocal cord sensor 11 described above is attached to the inner wall of the contact portion 12a so as to be able to bend in the Z direction and perform thickness vibration. A part of the side surface portion 12b of the side surface portion 12b is curved outward, so that the side surface portion 12b is easily bent and deformed.

The contact member 12 is an elastic body softer than the housing 21, and is formed of a resin material such as silicon rubber. The term "soft" means that the material is soft or structurally soft (for example, it is formed thin or wavy so that it is easily deformed). Further, it is desirable that a material that is comfortable to touch is used as the contact member 12.

The plate portion 13 has a flat plate shape, is arranged at one end of the side surface portion 12b so as to cover the opening 12c of the contact member 12, and is fixed. The plate portion 13 is formed of a resin material or a metal material that is harder than the contact member 12. A signal processing unit 29, which will be described later, is provided on the lower side (housing 21 side) of the center of the plate unit 13.

Next, the housing 21 and the noise sensor 28 will be described.

The housing 21 is made of a resin material that is harder than the contact member 12. The housing 21 is cylindrical and has a base portion 21a provided at one end of the cylinder and an annular strut portion 21b protruding from the base portion 21a toward the other end near the outer periphery of the base portion 21a. .. The housing 21 supports the plate portion 13 of the vibration acquisition portion 10 by the end surface 21c of the support column portion 21b. The fastener 26 described above is provided on the lower side of the base portion 21a (the side opposite to the support column portion 21b).

A cylindrical cover 22 is attached to the upper part of the housing 21. The cover 22 has an opening 22a larger than the contact member 12, and covers the base portion 21a and the strut portion 21b of the housing 21 with the contact portion 12a of the contact member 12 protruding and exposed from the opening 22a. There is.

An annular intermediate member 24 is provided between the housing 21 and the vibration acquisition unit 10 and between the housing 21 and the cover 22. The intermediate member 24 is an elastic body that is softer than the housing 21. The term "soft" means that the material is soft or structurally soft (for example, it is formed thin or wavy so that it is easily deformed). Specifically, the intermediate member 24 is made of a resin material (for example, sponge) that easily absorbs vibration. In the bone conduction microphone 1, by providing the intermediate member 24 between the housing 21 and the vibration acquisition unit 10, the vocal cord vibration acquired by the vibration acquisition unit 10 is transmitted to the noise sensor 28 through the housing 21. Is suppressed.

The noise sensor 28 is used to cancel the noise vibration from the vibration detected by the vocal cord sensor 11. The noise sensor 28 is a flat plate-shaped piezoelectric element that vibrates in thickness like the vocal cord sensor 11, and detects noise vibration that travels through the human body and enters the bone conduction microphone 1. When the noise sensor 28 is viewed from the thickness direction, the noise sensor 28 is arranged at a position overlapping the vocal cord sensor 11.

Further, the noise sensor 28 is arranged so that the vibration direction of the noise vibration detected by the noise sensor 28 is parallel to the vibration direction of the noise vibration detected by the voice band sensor 11. Specifically, the noise sensor 28 is provided on the inner wall of the base portion 21a of the housing 21 so that the thickness direction of the noise sensor 28 is the same as the thickness direction of the vocal cord sensor 11. Further, the noise sensor 28 is arranged so that the direction of the noise vibration detected by the noise sensor 28 differs from the direction of the noise vibration detected by the vocal cord sensor 11 by 180 °. Specifically, the noise sensor 28 is arranged in an upside-down posture with the vocal cord sensor 11.

A signal processing unit 29 is connected to the vocal cord sensor 11 and the noise sensor 28. The signal processing unit 29 is, for example, a sensor amplifier, and performs arithmetic processing on the electric signals output from the vocal cord sensor 11 and the noise sensor 28. The voice band sensor 11 and the noise sensor 28 are arranged so as to be 180 ° different from each other, and are wired so that their respective output signals are input to the signal processing unit 29 in opposite phases. In the signal processing unit 29, the noise vibration is canceled by adding the output signals of the vocal cord sensor 11 and the noise sensor 28. The output signal of one of the voice band sensor 11 or the noise sensor 28 may be amplified to make the amplitudes of the output signals of the voice band sensor 11 and the noise sensor 28 uniform, and then the output signal may be calculated.

FIG. 4 is a block diagram showing a control configuration of the helmet 2 including the bone conduction microphone 1.

As shown in FIG. 4, the helmet main body 50 has a control unit 55 and a speaker 51. The control unit 55 is composed of a CPU (central processing unit), a RAM (random access memory), a ROM (read only memory), and the like. The speaker 51 is, for example, a bone conduction speaker, and is connected to the control unit 55. The vocal cord sensor 11 and the noise sensor 28 of the bone conduction microphone 1 are connected to the signal processing unit 29, and the signal processing unit 29 is connected to the control unit 55. Further, the control unit 55 is connected to the transceiver 7. The communication device 9 is composed of the bone conduction microphone 1, the helmet body 50, and the transceiver 7.

The communication device 9 wirelessly communicates with an external device owned by the communication partner via the transceiver 7. Specifically, the signal output from the bone conduction microphone 1 is input to the transceiver 7 via the helmet body 50, and further transmitted to the external device of the communication partner via the transceiver 7. On the other hand, the signal transmitted from the external device is received by the transceiver 7 and output from the speaker 51 via the control unit 55 of the helmet body 50. As the communication method of the transceiver 7, for example, a frequency band of 422 MHz band or 440 MHz band is used.

The signal output from the bone conduction microphone 1 may be directly input to the transceiver 7 without going through the control unit 55 of the helmet body 50. The bone conduction microphone 1, the helmet body 50, and the transceiver 7 are each connected by wire, but the present invention is not limited to this, and may be wirelessly connected using a frequency band of 2.4 GHz such as Bluetooth (registered trademark). The transceiver 7 is provided outside the helmet 2, but is not limited to this. A communication unit including an antenna module is built in the helmet body 50, and radio waves are skipped from the helmet body 50 to communicate with an external device of the communication partner. May be good.

[1-2. Effect, etc.]
As described above, in the present embodiment, the bone conduction microphone 1 is a voice band sensor 11 that detects a voice band vibration emitted from a human body and a vibration including noise vibration different from the voice band vibration, and a noise sensor 28 that detects noise vibration. The noise sensor 28 used to cancel the noise vibration from the vibration detected by the voice band sensor 11 and the voice band sensor 11 are supported, the vibration is acquired by contacting the human body, and the acquired vibration is obtained by the voice band sensor 11. A vibration acquisition unit 10 that transmits to the vibration acquisition unit 10 and a housing 21 that supports each of the vibration acquisition unit 10 and the noise sensor 28 are provided.

As a result, the noise vibration detected by the vocal cord sensor 11 is canceled by using the noise vibration detected by the noise sensor 28. Therefore, the bone conduction microphone 1 can easily acquire vocal cord vibration with high accuracy.

Further, in the present embodiment, the bone conduction microphone 1 further includes an intermediate member 24 located between the vibration acquisition unit 10 and the housing 21, and the vibration acquisition unit 10 is provided with the housing via the intermediate member 24. The intermediate member 24 supported by 21 may be an elastic body softer than the housing 21.

As a result, the soft intermediate member 24 exists between the vibration acquisition unit 10 and the housing 21, and the vocal cord vibration acquired by the vibration acquisition unit 10 is less likely to enter the noise sensor 28 through the housing 21. Therefore, the vocal cord vibration detected by the vocal cord sensor 11 is less likely to be canceled by the noise sensor 28, and the bone conduction microphone 1 can easily acquire the vocal cord vibration with high accuracy.

Further, in the present embodiment, the intermediate member 24 may be formed of a resin material that absorbs vibration.

As a result, there is an intermediate member 24 that absorbs the vibration between the vibration acquisition unit 10 and the housing 21, and the vocal cord vibration acquired by the vibration acquisition unit 10 is less likely to enter the noise sensor 28 through the housing 21. Therefore, the vocal cord vibration detected by the vocal cord sensor 11 is less likely to be canceled by the noise sensor 28, and the bone conduction microphone 1 can easily acquire the vocal cord vibration with high accuracy.

Further, in the present embodiment, the noise sensor 28 may be arranged so that the vibration direction of the noise vibration detected by the noise sensor 28 is parallel to the vibration direction of the noise vibration detected by the voice band sensor 11.

As a result, the noise vibration in the same vibration direction as the noise vibration detected by the vocal cord sensor 11 is canceled by using the noise sensor 28. Therefore, the bone conduction microphone 1 can easily acquire vocal cord vibration with high accuracy.

Further, in the present embodiment, the noise sensor 28 may be arranged so that the direction of the noise vibration detected by the noise sensor 28 differs from the direction of the noise vibration detected by the vocal cord sensor 11 by 180 °.

As a result, for example, when the noise vibration detected by the vocal cord sensor 11 and the noise vibration detected by the noise sensor 28 are added together, the noise vibration is canceled. Therefore, the structure of the bone conduction microphone 1 can be easily simplified.

Further, in the present embodiment, each of the voice band sensor 11 and the noise sensor 28 is a flat plate-shaped piezoelectric element that vibrates in thickness, and when the voice band sensor 11 and the noise sensor 28 are viewed from the thickness direction, the noise sensor 28 is , It may be arranged at a position overlapping the voice band sensor 11.

As a result, the noise vibration at the same position as the noise vibration at the position detected by the vocal cord sensor 11 when viewed from the thickness direction is canceled by using the noise sensor 28. Therefore, the bone conduction microphone 1 can easily acquire vocal cord vibration with high accuracy.

Further, in the present embodiment, the vibration acquisition portion 10 has a tubular shape, and has a side surface portion 12b, a plate portion 13 provided on one end side of the side surface portion 12b, and a contact portion provided on the other end side. The housing 21 has a tubular shape, and has a base portion 21a provided on one end side of the tubular shape and an annular strut portion 21b protruding from the base portion 21a toward the other end side. The plate portion 13 of the vibration acquisition portion 10 is supported by the support column portion 21b of the housing 21, the vocal cord sensor 11 is provided on the inner wall of the contact portion 12a of the vibration acquisition portion 10, and the noise sensor 28 is a housing. It may be provided on the inner wall of the base portion 21a of the body 21.

As a result, the noise vibration detected by the contact portion 12a of the vibration acquisition portion 10 is canceled by using the noise vibration detected by the base portion 21a of the housing 21. Therefore, the noise vibration detected by the vocal cord sensor 11 is canceled by using the noise vibration detected by the noise sensor 28, and the bone conduction microphone 1 can easily acquire the vocal cord vibration with high accuracy.

Further, in the present embodiment, the bone conduction microphone 1 further includes a signal processing unit 29 connected to the voice band sensor 11 and the noise sensor 28, and the signal processing unit 29 noises the noise vibration detected by the voice band sensor 11. It may be canceled by using the noise vibration detected by the sensor 28.

As a result, the noise vibration is canceled by the signal processing unit 29 of the bone conduction microphone 1. Therefore, the bone conduction microphone 1 can easily cancel the noise vibration.

Further, in the present embodiment, the helmet 2 includes a helmet body 50 and the bone conduction microphone 1 attached to the jaw strap 3 of the helmet body 50.

This makes it easier for the helmet 2 to acquire vocal cord vibration using the bone conduction microphone 1.

(Embodiment 2)
Hereinafter, the bone conduction microphone 1A and the helmet 2A according to the second embodiment will be described with reference to FIGS. 5 to 9.

[2-1. Bone conduction microphone and helmet configuration]
The helmet according to the second embodiment detects the quality of the contact state between the human body and the bone conduction microphone when the helmet is worn, and notifies the result of the quality by sound or light.

FIG. 5 is a perspective view showing a helmet 2A including the bone conduction microphone 1A according to the second embodiment.

As shown in FIG. 5, the helmet 2A includes a bone conduction microphone 1A and a helmet body 50A. The helmet body 50A includes a control unit 55, a pair of speakers 51 connected to the control unit 55, and a light emitting diode (LED) 52 connected to the control unit 55. The bone conduction microphone 1A is connected to the control unit 55 of the helmet body 50A via the microphone cable 4.

The helmet body 50A is provided with a belt-shaped jaw strap 3 for fixing the helmet body 50A to the head. The length of the chin strap 3 can be adjusted manually. The bone conduction microphone 1A is attached to the jaw strap 3 using the fastener 26.

A buckle 5 is attached to the chin strap 3. The helmet body 50A is fixed to the head by engaging the insertion fitting 5b of the buckle 5 with the bracket 5a. The bracket 5a is provided with a mounting sensor 57 that detects whether or not the insertion fitting 5b is engaged with the bracket 5a. The mounting sensor 57 is, for example, a reed switch, which is turned on by inserting the insertion fitting 5b into the bracket 5a and turned off by removing the insertion fitting 5b from the bracket 5a. Further, by engaging the insertion fitting 5b of the buckle 5 with the bracket 5a, the vibration acquisition portion 10 which is a part of the bone conduction microphone 1A comes into contact with the jaw or the throat, and the bone conduction microphone 1A can acquire vocal cord vibration. It becomes a state.

When the helmet 2A is worn, if the length of the jaw cord 3 of the helmet 2A is too long, the contact state between the human body and the bone conduction microphone 1A may be insufficient, and vocal cord vibration may not be properly acquired. The bone conduction microphone 1A of the present disclosure has the following configuration so that vocal cord vibration can be effectively acquired when the helmet is worn.

FIG. 6 is a cross-sectional perspective view of the bone conduction microphone 1A. 7A and 7B are cross-sectional views of the bone conduction microphone 1A, where FIG. 7A shows a case where the contact state between the human body and the bone conduction microphone 1A is not detected, and FIG. 7B shows a case where the contact state is detected. Is.

As shown in FIGS. 6 and 7, the bone conduction microphone 1A is a vibration acquisition unit 10 that transmits the vibration acquired by contacting the vocal cord sensor 11, the noise sensor 28, the housing 21, and the human body to the vocal cord sensor 11. And a contact state sensor 35 that detects the contact state between the human body and the vibration acquisition unit 10. The noise sensor 28 has the same configuration as that of the first embodiment, and detailed description thereof will be omitted.

First, the vocal cord sensor 11 and the vibration acquisition unit 10 will be described.

The vocal cord sensor 11 is, for example, a flat plate-shaped piezoelectric element that performs thickness vibration, and detects vibration transmitted from the vibration acquisition unit 10. The vibration detected by the vocal cord sensor 11 is a composite vibration including a vocal cord vibration emitted from the human body and a noise vibration different from the vocal cord vibration. The noise vibration input to the bone conduction microphone 1A is canceled by using the noise sensor 28.

The vibration acquisition unit 10 includes a contact member 12 that comes into contact with the human body and a plate unit 13 provided on the lower side (minus side in the Z direction) of the contact member 12.

The contact member 12 is a member that comes into contact with the human body and acquires vibration. The contact member 12 has a cylindrical shape, and has a side surface portion 12b, an opening portion 12c having an opening at one end of the side surface portion 12b, and a contact portion 12a provided at the other end of the side surface portion 12b and in contact with the human body. Be prepared. In FIG. 3, the contact portion 12a is provided on the Z-direction plus side of the side surface portion 12b, and the opening portion 12c is provided on the Z-direction minus side of the side surface portion 12b. The vocal cord sensor 11 described above is attached to the inner wall of the contact portion 12a of the vibration acquisition portion 10 so that the vocal cord sensor 11 can bend in the Z direction to perform thickness vibration. A part of the side surface portion 12b of the side surface portion 12b is curved outward, so that the side surface portion 12b is easily bent and deformed.

The contact member 12 is an elastic body softer than the housing 21, and is formed of a resin material such as silicon rubber. "Soft" means that the material is soft or structurally soft. Further, it is desirable that a material that is comfortable to touch is used as the contact member 12.

The plate portion 13 has a flat plate shape, is arranged at one end of the side surface portion 12b so as to cover the opening 12c of the contact member 12, and is fixed. The plate portion 13 is formed of a resin material or a metal material that is harder than the contact member 12. The contact state sensor 35 is arranged on the lower side (the housing 21 side) of the center of the plate portion 13.

The plate portion 13 is provided with an annular diaphragm 30. Specifically, the inner peripheral region of the upper surface 30b of the diaphragm 30 is fixed to the outer peripheral region of the lower surface (the surface on the housing 21 side) of the plate portion 13. The diaphragm 30 is an elastic body that is softer than the contact member 12, and easily absorbs vibration noise. Further, the diaphragm 30 is more easily bent than the contact member 12. The term "easy to bend" means that the material is easy to bend or structurally easy to bend. For example, the diaphragm 30 may be formed of a thin plate-shaped resin film (for example, polyethylene terephthalate film) or a metal film so that the diaphragm 30 can be easily bent. The diaphragm 30 in the second embodiment has a function as an intermediate member 24 shown in the first embodiment. That is, by providing the diaphragm 30 between the housing 21 and the vibration acquisition unit 10, the vocal cord vibration acquired by the vibration acquisition unit 10 is suppressed from entering the noise sensor 28 through the housing 21.

Next, the housing 21 and the contact state sensor 35 will be described.

The housing 21 is made of a resin material that is harder than the contact member 12. The housing 21 is cylindrical and has a base portion 21a provided at one end of the cylinder and an annular strut portion 21b protruding from the base portion 21a toward the other end near the outer periphery of the base portion 21a. .. A fastener 26 is provided on the lower side of the base portion 21a (the side opposite to the support column portion 21b).

A cylindrical cover 22 is attached to the upper part of the housing 21. The cover 22 has an opening 22a larger than the contact member 12, and covers the base portion 21a and the strut portion 21b of the housing 21 with the contact portion 12a of the contact member 12 protruding and exposed from the opening 22a. There is. A predetermined gap is provided between the opening 22a of the cover 22 and the side surface portion 12b of the contact member 12, so that the cover 22 and the contact member 12 are less likely to come into contact with each other.

The diaphragm 30 and the vibration acquisition portion 10 described above are arranged on the end surface 21c of the support column portion 21b of the housing 21. The diaphragm 30 is arranged so that the outer peripheral region of the lower surface 30a of the diaphragm 30 overlaps the end surface 21c of the support column 21b. An annular packing 33 made of synthetic rubber is arranged in the outer peripheral region of the upper surface 30b of the diaphragm 30. When the cover 22 is attached to the housing 21, the diaphragm 30 is pressed against the support column 21b by the packing 33. As a result, the outer peripheral region of the diaphragm 30 is sandwiched between the packing 33 and the support column portion 21b.

That is, the diaphragm 30 is located between the vibration acquisition unit 10 and the housing 21, and the vibration acquisition unit 10 is supported by the housing 21 via the diaphragm 30. Further, the vibration acquisition unit 10 is supported by the housing 21 so that the position can be displaced in the axial direction (Z direction) by bending the diaphragm 30.

The contact state sensor 35 is arranged in a direction in which the vibration acquisition unit 10 is displaced, and specifically, is provided inside the housing 21 and on the sensor fixing unit 36 protruding from the base portion 21a. The contact state sensor 35 detects the contact state between the human body and the vibration acquisition unit 10 in a state of being in contact with the vibration acquisition unit 10. The contact state sensor 35 is, for example, a pressure sensor, and when the vibration acquisition unit 10 is displaced in position as shown in FIG. 7B, it is pushed into the vibration acquisition unit 10 to detect the contact pressure. The signal detected by the contact state sensor 35 is output to the control unit 55.

The contact state sensor 35 is not limited to the pressure sensor, and may be an optical sensor, a reed switch, a limit switch, or a tactile switch that detects a position displacement. When the contact state sensor 35 is a tactile switch, the stroke s1 in the Z direction in which the switch is switched may be appropriately selected to detect the contact state between the human body and the bone conduction microphone 1A.

FIG. 8 is a block diagram showing a control configuration of the helmet 2A including the bone conduction microphone 1A.

As shown in FIG. 8, the helmet body 50A has a control unit 55 and a notification unit 53 connected to the control unit 55. The control unit 55 is composed of a CPU, RAM, ROM, and the like.

The notification unit 53 includes a speaker 51 that uses sound to notify the contact state, and a light emitting diode 52 that uses light to notify the contact state. Instead of the light emitting diode 52, a video display may be provided to notify the contact state using an image. The vocal cord sensor 11, the noise sensor 28, and the contact state sensor 35 of the bone conduction microphone 1A are connected to the control unit 55. The mounting sensor 57 of the buckle 5 is connected to the control unit 55. Further, the control unit 55 is connected to the transceiver 7. The communication device 9A is composed of the bone conduction microphone 1A, the helmet body 50A, and the transceiver 7.

The communication device 9A wirelessly communicates with an external device owned by the communication partner via the transceiver 7. Specifically, the signal output from the bone conduction microphone 1A is input to the transceiver 7 via the helmet body 50A, and further transmitted to the external device of the communication partner via the transceiver 7. On the other hand, the signal transmitted from the external device is received by the transceiver 7 and output from the speaker 51 via the control unit 55 of the helmet body 50A. As the communication method of the transceiver 7, for example, a frequency band of 422 MHz band or 440 MHz band is used.

The signal output from the bone conduction microphone 1A may be directly input to the transceiver 7 without going through the control unit 55 of the helmet body 50A. The bone conduction microphone 1A, the helmet body 50A, and the transceiver 7 are each connected by wire, but are not limited to this, and may be wirelessly connected using a frequency band of 2.4 GHz such as Bluetooth (registered trademark). The transceiver 7 is provided outside the helmet 2A, but is not limited to this. A communication unit including an antenna module is built in the helmet body 50A, and radio waves are skipped from the helmet body 50A to communicate with an external device of the communication partner. May be good.

[2-2. How to use the helmet]
FIG. 9 is a diagram showing the operation and usage of the helmet 2A according to the second embodiment.

First, the user who uses the bone conduction microphone 1A wears the helmet 2A. Specifically, the insertion metal fitting 5b of the buckle 5 attached to the chin strap 3 and the bracket 5a are engaged with each other to fix the helmet 2A to the head.

Whether or not the helmet 2A is attached is determined by whether or not the attachment sensor 57 provided on the buckle 5 is turned on (S1). If the mounting sensor 57 is ON, the helmet 2A is mounted, and if it is not ON, it is determined that the helmet 2A is in a detached state.

By wearing the helmet 2A (Yes in S1), the vibration acquisition unit 10 of the bone conduction microphone 1A is in contact with the human body such as the jaw. Further, the vibration acquisition unit 10 is pushed in from the human body and displaced to the negative side in the Z direction to press the contact state sensor 35.

At this time, the control unit 55 determines whether or not the value detected by the pressed contact state sensor 35 has reached a predetermined threshold value (S2). When the contact state sensor 35 is a pressure sensor, the predetermined threshold value is determined to be a pressure value at which the vocal cord vibration can be sufficiently acquired by using the vocal cord sensor 11.

When the value detected by the contact state sensor 35 is not equal to or greater than the threshold value (No in S2), the control unit 55 operates the notification unit 53. Specifically, a warning sound is emitted from the speaker 51, which is the notification unit 53, or the light emitting diode 52 is turned on. As a result, the user is notified that the contact state between the human body and the bone conduction microphone 1A is not appropriate (S3).

The user who receives the notification either takes off the helmet 2A or adjusts the length of the chin strap 3 with the helmet 2A attached. When the length of the jaw strap 3 is appropriately adjusted and the value detected by the contact state sensor 35 becomes equal to or higher than the threshold value (Yes in S2), the call is started (S4). As a result, the bone conduction microphone 1A can make a call while being in proper contact with the human body.

In the present embodiment, the contact state is detected when the mounting sensor 57 is ON, but the present invention is not limited to this. For example, instead of the mounting sensor 57, the power switch of the helmet 2A may be used to execute step S2 and subsequent steps of FIG. 9 when the power switch is ON.

Further, the determination of whether or not the contact state has reached the threshold value (S2) is not immediately after the determination of whether or not the mounting sensor 57 is turned on (S1), but after a certain period of time (for example, several seconds) has elapsed. You may. As a result, it is possible to prevent the user from being notified that the contact state is not appropriate in the time until the length of the jaw strap 3 is adjusted after wearing the helmet 2A.

[2-3. Effect, etc.]
As described above, in the present embodiment, the bone conduction microphone 1A supports the vocal cord sensor 11 for detecting the vocal cord vibration and the vocal cord sensor 11, contacts the human body to acquire the vocal cord vibration, and obtains the acquired vocal cord vibration. The contact state sensor 35 that detects the contact state between the human body and the vibration acquisition unit 10 when the vibration acquisition unit 10 transmitted to the vocal cord sensor 11 and the human body and the vibration acquisition unit 10 come into contact with each other, and the vibration acquisition unit 10 and the contact. A housing 21 that supports each of the state sensors 35 is provided.

As a result, the contact state sensor 35 of the bone conduction microphone 1A detects the contact state between the human body and the vibration acquisition unit 10. Therefore, the bone conduction microphone 1A can easily acquire vocal cord vibration appropriately.

Further, in the present embodiment, the contact state sensor 35 is a pressure sensor, and the contact state may be detected by detecting the contact pressure between the human body and the vibration acquisition unit 10.

As a result, the contact state sensor 35 detects the contact state by the contact pressure between the human body and the vibration acquisition unit 10. Therefore, the bone conduction microphone 1A can easily acquire vocal cord vibration appropriately.

Further, in the present embodiment, the contact state sensor 35 is an optical sensor, a reed switch, a limit switch or a tactile switch, and the contact state may be detected by detecting the positional displacement of the vibration acquisition unit 10.

As a result, the contact state sensor 35 detects the contact state based on the position displacement of the vibration acquisition unit 10. Therefore, the bone conduction microphone 1A can easily acquire vocal cord vibration appropriately.

Further, in the present embodiment, the vibration acquisition unit 10 and the housing 21 are each tubular, and the bone conduction microphone 1A further includes a diaphragm 30 located between the vibration acquisition unit 10 and the housing 21. The vibration acquisition unit 10 is supported by the housing 21 via the diaphragm 30 so that the position can be displaced in the axial direction of the vibration acquisition unit 10, and the contact state sensor 35 is inside the housing 21. May be detected in a state where is arranged in the direction of position displacement and is in contact with the position-displaced vibration acquisition unit 10.

As a result, the contact state sensor 35 detects the contact state in a state of being in contact with the position-displaced vibration acquisition unit 10. Therefore, the bone conduction microphone 1A can easily acquire vocal cord vibration appropriately.

Further, in the present embodiment, the bone conduction microphone set 8 (see FIG. 8) has a predetermined threshold value detected by the bone conduction microphone 1A, the notification unit 53 for notifying the contact state, and the contact state sensor 35. A control unit 55 that activates the notification unit 53 when the value has not been reached is provided.

As a result, the bone conduction microphone set 8 notifies the contact state between the human body and the bone conduction microphone 1A by using the notification unit 53. If the contact state is inadequate, this notification will trigger the contact state to be adjusted. Therefore, the bone conduction microphone set 8 can easily acquire vocal cord vibration with the bone conduction microphone 1A.

Further, in the present embodiment, the notification unit 53 of the bone conduction microphone set 8 may notify the contact state by using sound, light, or an image.

As a result, the bone conduction microphone set 8 notifies the contact state between the human body and the bone conduction microphone 1A using sound, light, or an image. By adjusting the contact state triggered by these sounds, lights, or images, the bone conduction microphone set 8 can easily acquire vocal cord vibration with the bone conduction microphone 1A.

Further, in the present embodiment, the notification unit 53 of the bone conduction microphone set 8 may be a speaker, a light emitting diode, or a video display.

As a result, the bone conduction microphone set 8 notifies the contact state between the human body and the bone conduction microphone 1A by using a speaker, a light emitting diode, or a video display. By adjusting the contact state triggered by these speakers, light emitting diodes, or video displays, the bone conduction microphone set 8 can easily acquire vocal cord vibration with the bone conduction microphone 1A.

Further, in the present embodiment, the helmet 2A includes a helmet body 50A having a notification unit 53 and a control unit 55, and the bone conduction microphone 1A attached to the jaw cord 3 of the helmet body 50A.

When the contact state is insufficient, the chin strap 3 of the helmet 2A is adjusted triggered by the notification by the notification unit 53. Therefore, the helmet 2A can easily acquire vocal cord vibration with the bone conduction microphone 1A.

(Other embodiments)
As described above, an embodiment has been described as an example of the technique in the present disclosure. To that end, the accompanying drawings and detailed description are provided.

Therefore, among the components described in the attached drawings and the detailed description, not only the components essential for solving the problem but also the components not essential for solving the problem in order to exemplify the above technology. Can also be included. Therefore, the fact that those non-essential components are described in the accompanying drawings or detailed description should not immediately determine that those non-essential components are essential.

Further, since the above-described embodiment is for exemplifying the technique in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of claims or the equivalent scope thereof.

The contact member 12, the housing 21 and the cover 22 in the first and second embodiments are not limited to a cylindrical shape, and may be a square tubular shape.

In the first embodiment, the signal processing unit 29 of the bone conduction microphone 1 cancels the noise vibration, but the present invention is not limited to this. For example, the signals of the vocal cord sensor 11 and the noise sensor 28 may be output to the control unit 55 of the helmet body 50 without going through the signal processing unit 29, and the noise vibration may be canceled by the control unit 55. That is, the helmet body 50 has a control unit 55 connected to the vocal cord sensor 11 and the noise sensor 28, and the control unit 55 cancels the noise vibration detected by the vocal cord sensor 11 by using the noise vibration detected by the noise sensor 28. You may.

In the first embodiment, the output signals of the vocal cord sensor 11 and the noise sensor 28 are added together to cancel the noise vibration, but the present invention is not limited to this. For example, the voice band sensor 11 and the noise sensor 28 are arranged or wired so that the signals of the voice band sensor 11 and the noise sensor 28 are output in the same phase, and the signal processing unit 29 uses the output signal of the voice band sensor 11. The noise vibration may be canceled by subtracting the output signal of the noise sensor 28.

The vocal cord sensor 11 in the second embodiment is not limited to the piezoelectric element, and may be a vibration detection element such as an acceleration pickup meter or a differential transformer.

The notification unit 53 in the second embodiment is not limited to the speaker and the light emitting diode, and may be a vibrator that notifies the contact state by using vibration. Further, the notification destination of the contact state is not limited to the helmet 2A, and may be the transceiver 7, or a communication device owned by the communication partner.

The present disclosure is applicable to a bone conduction microphone that comes into contact with the human body to acquire vocal cord vibration. Further, the present disclosure can be applied to a voice input device when a vehicle helmet, a construction site helmet, or the like is worn on the head to make a call with a communication partner.

1, 1A Bone conduction microphone 2, 2A Helmet 3 Jaw cord 4 Microphone cable 5 Buckle 5a Bracket 5b Insertion bracket 7 Transceiver 8 Bone conduction microphone set 9, 9A Communication device 10 Vibration acquisition part 11 Voice band sensor 12 Contact member 12a Contact part 12b Side surface 12c Opening 13 Plate 21 Housing 21a Base 21b Strut 21c Strut end 22 Cover 22a Cover opening 24 Intermediate member 26 Fastener 28 Noise sensor 29 Signal processing 30 Diaphragm 30a Diaphragm bottom surface 30b Diaphragm Top surface 33 Packing 35 Contact state sensor 36 Sensor fixing part 50, 50A Helmet body 51 Speaker 52 Light emitting diode 53 Notification part 55 Control part 57 Mounting sensor s1 Stroke

Claims (16)

A vocal cord sensor that detects vocal cord vibrations emitted from the human body and vibrations including noise vibrations different from the vocal cord vibrations,
A noise sensor that detects the noise vibration and is used to cancel the noise vibration from the vibration detected by the voice band sensor.
A vibration acquisition unit that supports the vocal cord sensor, contacts the human body to acquire the vibration, and transmits the acquired vibration to the vocal cord sensor.
E Bei a housing that supports each of the vibration acquisition section and the noise sensor,
The vibration acquisition portion has a tubular shape, and has a side surface portion, a plate portion provided on one end side of the side surface portion, and a contact portion provided on the other end side.
The housing is tubular and has a base portion provided on one end side of the tubular shape and an annular strut portion protruding from the base portion toward the other end side.
The plate portion of the vibration acquisition portion is supported by a strut portion of the housing,
The vocal cord sensor is provided on the inner wall of the contact portion of the vibration acquisition portion.
The noise sensor is a bone conduction microphone provided on the inner wall of the base portion of the housing . Further, an intermediate member located between the vibration acquisition unit and the housing is provided.
The vibration acquisition unit is supported by the housing via the intermediate member.
The bone conduction microphone according to claim 1, wherein the intermediate member is an elastic body softer than the housing. The bone conduction microphone according to claim 2, wherein the intermediate member is made of a resin material that absorbs the vibration. The noise sensor is arranged so that the vibration direction of the noise vibration detected by the noise sensor is parallel to the vibration direction of the noise vibration detected by the voice band sensor. The bone conduction microphone described in the section. The bone conduction microphone according to claim 4, wherein the noise sensor is arranged so that the direction of the noise vibration detected by the noise sensor is 180 ° different from the direction of the noise vibration detected by the voice band sensor. Each of the vocal cord sensor and the noise sensor is a flat plate-shaped piezoelectric element that vibrates in thickness.
The bone conduction microphone according to any one of claims 1 to 5, wherein when the vocal cord sensor and the noise sensor are viewed from the thickness direction, the noise sensor is arranged at a position overlapping the vocal cord sensor. Further, a signal processing unit connected to the vocal cord sensor and the noise sensor is provided.
The bone conduction microphone according to any one of claims 1 to 6 , wherein the signal processing unit cancels the noise vibration detected by the voice band sensor by using the noise vibration detected by the noise sensor. Helmet body and
A helmet provided with the bone conduction microphone according to any one of claims 1 to 7 , which is attached to the jaw strap of the helmet body. A vocal cord sensor that detects vocal cord vibrations emitted from the human body and vibrations including noise vibrations different from the vocal cord vibrations,
A noise sensor that detects the noise vibration and is used to cancel the noise vibration from the vibration detected by the voice band sensor.
A vibration acquisition unit that supports the vocal cord sensor, contacts the human body to acquire the vibration, and transmits the acquired vibration to the vocal cord sensor.
A housing that supports each of the vibration acquisition unit and the noise sensor ,
A bone conduction microphone provided inside the housing and provided with a contact state sensor that detects a contact state between the human body and the vibration acquisition unit when the human body and the vibration acquisition unit come into contact with each other . The bone conduction microphone according to claim 9 , wherein the contact state sensor is a pressure sensor, and detects the contact state by detecting the contact pressure between the human body and the vibration acquisition unit. The bone conduction microphone according to claim 9 , wherein the contact state sensor is an optical sensor, a reed switch, a limit switch or a tactile switch, and detects the contact state by detecting the positional displacement of the vibration acquisition unit. The vibration acquisition unit and the housing are each tubular and have a tubular shape.
Further, a diaphragm located between the vibration acquisition unit and the housing is provided.
The vibration acquisition unit is supported by the housing via the diaphragm so that the vibration acquisition unit can be displaced in the axial direction.
The contact state sensor is arranged in a direction in which the vibration acquisition unit is displaced in the position inside the housing, and detects the contact state in a state of being in contact with the position-displaced vibration acquisition unit according to claims 9 to 11 . The bone conduction microphone according to any one item. The bone conduction microphone according to any one of claims 9 to 12 ,
A notification unit that notifies the contact status and
A bone conduction microphone set including a control unit that activates the notification unit when the value detected by the contact state sensor does not reach a predetermined threshold value. The bone conduction microphone set according to claim 13 , wherein the notification unit notifies the contact state by using sound, light, or an image. The bone conduction microphone set according to claim 13 , wherein the notification unit is a speaker, a light emitting diode, or a video display. Helmet body and
With the bone conduction microphone according to any one of claims 9 to 11.
With
The helmet body has a notification unit for notifying the contact state and a control unit for operating the notification unit when the value detected by the contact state sensor does not reach a predetermined threshold value.
The bone conduction microphone is a helmet attached to the jaw strap of the helmet body .

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