Patent Publication Number: US-2021185420-A1

Title: Bone conduction microphone and bone conduction headset

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a bone conduction microphone and a bone conduction headset. 
     2. Description of the Related Art 
     When a person speaks, the vocal cords vibrate, causing oral resonance and nasal resonance. As a microphone for collecting human voice, a voice microphone and a bone conduction microphone are known. The voice microphone detects voice as air vibration and converts it into an electric signal. The bone conduction microphone detects voice emitted by the person oneself as vibration of skin on the mandible due to oral resonance and skin on a nasal bone due to nasal resonance, and converts it into an electric signal. In recent years, attention has been focused on bone conduction microphones that are less likely to be affected by ambient noise. 
     Patent Literature (PTL) 1 discloses a hands-free communication unit equipped with a bone conduction microphone that picks up vibration of skin on the nosal bone with a vibration sensor built into a nose pad of glasses and converts it into an electric signal (hereinafter, referred to as “glasses with a bone conduction microphone”). 
     PTL 1 is Unexamined Japanese Patent Publication No. 8-298694. 
     SUMMARY 
     The present disclosure provides a bone conduction microphone and a bone conduction headset that allow the bone conduction microphone to be separately worn and can suppress decrease in detection accuracy of vibration of skin on a nasal bone even when a human body wears glasses. 
     An aspect of the present disclosure is a bone conduction microphone including: a vibration sensor that comes into contact with a nose of a living body from outside the living body and converts vibration into an electric signal; a head-worn part that is worn on a head of the living body; and a sensor support that hangs from the head-worn part and supports the vibration sensor toward the nose. 
     Another aspect of the present disclosure is a bone conduction headset including: a vibration sensor that comes into contact with a nose of a living body from outside the living body and converts vibration into an electric signal; a head-worn part that is worn on a head of the living body; a sensor support that hangs from the head-worn part and supports the vibration sensor toward the nose; and a bone conduction speaker that is connected to the head-worn part and outputs a voice signal by vibration. 
     According to the present disclosure, even when a living body wears glasses, a bone conduction microphone can be separately worn, and decrease in detection accuracy of vibration of skin on a nasal bone can be suppressed. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a wearing state of a bone conduction microphone of a first exemplary embodiment. 
         FIG. 2  is a perspective view illustrating a wearing state of a bone conduction microphone of a second exemplary embodiment. 
         FIG. 3  is a perspective view illustrating a wearing state of a bone conduction microphone of a third exemplary embodiment. 
         FIG. 4  is a front view illustrating a state of the bone conduction microphone of the third exemplary embodiment when it is not worn. 
         FIG. 5A  is a diagram illustrating structure of a connecting portion between a head-worn part body and a support base member in the bone conduction microphone of the third exemplary embodiment, and is a perspective view seen from the outside (front side). 
         FIG. 5B  is a diagram illustrating the structure of the connecting portion between the head-worn part body and the support base member in the bone conduction microphone of the third exemplary embodiment, and is a perspective view seen from the inside (back side). 
         FIG. 6A  is a schematic view illustrating structure of a clip in a bifurcated shape in the bone conduction microphone of the third exemplary embodiment, and is a front view illustrating a state in which two arms of the clip are closed by spring force when the clip is not worn. 
         FIG. 6B  is a schematic view illustrating the structure of the clip in the bifurcated shape in the bone conduction microphone of the third exemplary embodiment, and is a front view illustrating a state in which the two arms of the clip are opened against the spring force when the clip is worn. 
         FIG. 7  is a front view illustrating a state of a bone conduction microphone of a fourth exemplary embodiment when it is not worn. 
         FIG. 8  is a perspective view illustrating a wearing state of a bone conduction headset configured using the bone conduction microphone of the second exemplary embodiment as a fifth exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, exemplary embodiments will be described in detail with appropriate reference to the drawings. However, unnecessarily detailed description may be eliminated. For example, detailed description of a well-known item or duplicated description of a substantially identical configuration may be eliminated. This is to prevent the following description from being unnecessarily redundant to facilitate understanding of those skilled in the art. The attached drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the scope of claims. 
     Background to Obtain an Aspect of the Present Disclosure 
     A hands-free calling unit equipped with the bone conduction microphone described in PTL 1 incorporates a vibration sensor in a nose pad portion of glasses, and thus can be worn as if glasses are worn, thereby having an advantage of easy wearing. Unfortunately, when a person wearing other glasses such as corrective glasses or dust-proof glasses tries to use glasses with a bone conduction microphone, positions of the other glasses and the glasses with a bone conduction microphone overlap, and thus causing difficulty in wearing both. When both the other glasses and the glasses with a bone conduction microphone are worn, the glasses with a bone conduction microphone are to be worn from above or below the other glasses while overlapping the other glasses. This causes a nose pad portion of the other glasses to interfere with a nose pad portion of the bone conduction microphone. Thus, the glasses with a bone conduction microphone are less likely to properly pick up vibration of skin on a nasal bone. 
     In other words, those who need to wear different glasses need to prepare new dedicated glasses with a bone conduction microphone in which a correction lens or a dustproof lens is preliminarily fitted in a frame of the glasses with a bone conduction microphone. Thus, the hands-free calling unit described in PTL 1 causes those who need to wear different glasses to have more cost or an inconvenient use, for example. 
     The following exemplary embodiments each describe a bone conduction microphone and a bone conduction headset that allow the bone conduction microphone to be separately worn and can suppress decrease in detection accuracy of vibration of skin on a nasal bone even when a living body wears glasses. 
     First Exemplary Embodiment 
     First, a bone conduction microphone of a first exemplary embodiment will be described.  FIG. 1  is a perspective view illustrating a wearing state of the bone conduction microphone of the first exemplary embodiment.  FIG. 1  shows up-and-down, front-back, and left-right directions. These directions are based on front-back, up-and-down, and left-right directions as seen from a person. The up-and-down, front-back, and left-right directions are identical in every exemplary embodiment. 
     As illustrated in  FIG. 1 , bone conduction microphone  1  of the first exemplary embodiment includes left and right vibration sensors  15  that come into contact with nose  205  at the center of face  202  of wearer (human body)  200  from outside the human body and converts vibration of skin on a nasal bone into an electric signal. Bone conduction microphone  1  includes headband  11  as a head-worn part to be worn on head  201  above nose  205 . Bone conduction microphone  1  includes two sensor support wires  13  as sensor supports that extend downward from central portion  11   a  in the left-right direction of headband  11  and support left and right vibration sensors  15  toward nose  205 . The human body is an example of a living body, and another living body (e.g., an animal) may be applicable. 
     Headband  11  is an elastic C-shaped head wearer and is worn such that central portion  11   a  thereof is positioned on a frontal region above forehead  203  while an open portion of the C-shape is expanded to allow end portions  11   b  (opposite end portions) in the left-right direction to be each positioned in the temporal region behind the ears. As a result, headband  11  is securely worn on head  201  due to elastic force of end portions  11   b  (opposite end portions) in the left-right direction, acting to narrow a distance between end portions  11   b.    
     Headband  11  can be made of resin or metal. Here, as an example, headband  11  is made of resin in consideration of wearability and weight. 
     Two sensor support wires  13  are each connected at its upper end to central portion  11   a  of headband  11  in the left-right direction and hang down passing through the front of glabella  204  and extending downward. Then, left and right vibration sensors  15  are attached to lower ends of respective two sensor support wires  13 . That is, vibration sensors  15  includes a vibration sensor that comes into contact with the left side of the nose and a vibration sensor that comes into contact with the right side of the nose. 
     Sensor support wires  13  are each configured to be able to hold its form acquired by freely bent deformation or freely curved deformation. This enables vibration sensors  15  to be easily adjusted in position and orientation. Sensor support wires  13  may be made of metal or may be made of elastic resin. 
     One of end portions  11   b  of headband  11  in the left-right direction (the left end part located above the left ear in the illustrated example) incorporates wireless module  25  that is an electronic circuit and battery  26  that is a power supply. Wireless module  25  operates by being supplied with power from battery  26 , and has a function of wirelessly transmitting a detection signal of vibration sensor  15  to the outside (e.g., a smartphone existing near bone conduction microphone  1 ). As an example of wireless module  25 , a Bluetooth (registered trademark) low energy (BLE) module, i.e., a wireless module for Bluetooth (registered trademark), a near field communication (NFC) module, i.e., a module for short-range communication, a wireless local area network (LAN) module, or the like can be appropriately used. Wireless module  25  and battery  26  can be disposed at any position in headband  11 . For example, wireless module  25  and battery  26  may be disposed near central portion  11   a  in the left-right direction. 
     Conductor wires  21 ,  22  for signal transmission from vibration sensor  15  to wireless module  25  are configured to pass through inside sensor support wires  13  and headband  11 . Sensor support wires  13  are each composed of, for example, a thin tube, and each of conductor wires  21  connected to respective vibration sensors  15  pass through inside the tube. Two conductor wires  21 , each of which protruding from an upper end of the tube of sensor support wire  13 , are combined into one conductor wire  22  and connected to wireless module  25  through a hollow portion of headband  11  or the like. 
     Any wiring manner can be appropriately selected other than a method of allowing conductor wires  21  and  22  to pass through respective sensor support wires  13 , and headband  11 . For example, sensor support wire  13  itself may be formed of a metal wire to also function as conductor wire  21 . Headband  11  may be provided on its surface with plated wiring or the like. 
     Next, action will be described. 
     To use this bone conduction microphone  1 , as illustrated in  FIG. 1 , headband  11  is worn on head  201 , and left and right vibration sensors  15  supported at lower ends of respective sensor support wires  13  are pressed against corresponding right and left skin surfaces at places with nasal bone of nose  205 . This causes left and right vibration sensors  15  to pinch nose  205  from both sides of the nasal bone. 
     When wearer  200  speaks in this state, vibration caused by the speaking is transmitted to the nasal cavity, and vibration of the skin on the nasal bone is detected by vibration sensors  15  pressed against nose  205 . Then, a detected signal (detection signal) is transmitted to wireless module  25  and is processed as necessary. Then, the detected signal is transmitted to an external communication terminal, such as a smartphone, using wireless module  25  or the like. 
     As illustrated in  FIG. 1 , even when wearer  200  wears glasses M, such as corrective glasses, bone conduction microphone  1  can be worn without interfering with glasses M. That is, sensor support wires  13  allows respective vibration sensors  15  to be in contact with nose  205  while avoiding the frame of glasses M, so that bone conduction microphone  1  can be worn regardless of whether glasses M are worn. Bone conduction microphone  1  includes sensor support wires  13  that pass through between both eyes, so that limitation of a field of view can be suppressed as much as possible. 
     Bone conduction microphone  1  also can adjust a position and an orientation of each of vibration sensors  15  in contact with nose  205  by adjusting a bending degree of the corresponding one of sensor support wires  13 . This enables bone conduction microphone  1  to prevent vibration sensors  15  from interfering with a nose pad portion of glasses M even when wearer  200  wears glasses M. Thus, decrease in detection accuracy of vibration sensors  15  can be suppressed. 
     When sensor support wires  13  each have an adjustment function, bone conduction microphone  1  enables each of vibration sensors  15  to come into close contact with a position with high sensitivity in accordance with a position and a size of nose  205 , and thus vibration of skin on the nasal bone can be appropriately picked up. 
     Conductor wires  21  pass through inside respective sensor support wires  13 , so that conductor wires  21  can be hidden to be invisible from the outside. This enables improving appearance and preventing conductor wires  21  from blocking a part of a field of view. 
     Second Exemplary Embodiment 
     Next, a bone conduction microphone of a second exemplary embodiment will be described.  FIG. 2  is a perspective view illustrating a wearing state of the bone conduction microphone of the second exemplary embodiment. 
     As illustrated in  FIG. 2 , bone conduction microphone  2  of the second exemplary embodiment is different from bone conduction microphone  1  of the first exemplary embodiment illustrated in  FIG. 1  in that support frame  12  (an example of the support base member) is provided between sensor support wires  13  and headband  11 . Support frame  12  is a rod-shaped member curved in a C-shape and elongated in the left-right direction, and is connected at end portions  12   b  in the left-right direction to near corresponding end portions  11   b  in the left-right direction of headband  11 . 
     This allows central portion  12   a  of support frame  12  in the left-right direction to be supported in a noncontact manner in a floating state in front of forehead  203  when headband  11  is worn on head  201 . Then, upper ends of respective sensor support wires  13  on the left and right having lower ends with respective vibration sensors  15  attached are connected to central portion  12   a  of support frame  12 . Here, headband  11  and support frame  12  constitute head-worn part  10 , and headband  11  corresponds to the head-worn part body. Support frame  12  may be made of metal, or may be made of resin from the viewpoint of weight reduction and manufacturability. 
     Bone conduction microphone  2  also includes two conductor wires  21 , through which signals detected by corresponding vibration sensors  15  are transmitted, pass through respective sensor support wires  13  and are combined into one conductor wire in support frame  12 . The one conductor wire is connected to wireless module  25  incorporated in a left end portion of headband  11  from central portion  12   a  of frame  12  through a connecting portion. 
     When a wearer wears this bone conduction microphone  2 , upper ends of sensor support wires  13  are connected to support frame  12  disposed in a noncontact manner in a floating state in front of forehead  203 . Thus, vibration, such as scratching noise at a worn portion that may occur in head-worn part  10 , is less likely to be transmitted to vibration sensors  15  through corresponding sensor support wires  13 . This causes bone conduction microphone  2  to be less likely to pick up noise, so that detection accuracy of nasal bone vibration can be improved. 
     Bone conduction microphone  2  includes sensor support wires  13  that hang down from central portion  12   a  of support frame  12  protruding in front of forehead  203 . In this case, unlike sensor support wires  13  that is hung down from directly above nose  205  and being parallel to face  202 , bone conduction microphone  2  enables sensor support wires  13  to hang down at an angle toward nose  205  from the front of forehead  203 , i.e., toward a direction (rear) in which sensor support wires  13  gradually approaches face  202  from the front of face  202 . Thus, bone conduction microphone  2  allows vibration sensors  15  to be likely to press against nose  205  more appropriately. 
     Sensor support wires  13  are each connected at its upper end to support frame  12  located in front of forehead  203 , so that sensor support wires  13  extending from support frame  12  to corresponding vibration sensors  15  can be shortened in length. For example, when sensor support wires  13  are each made of a thin tubular wire, increase in length reduces strength thereof. This may cause improper pressing of vibration sensors  15  against nose  205 . In contrast, bone conduction microphone  2  enables sensor support wires  13  to be shortened in length, so that decrease in strength of each of sensor support wires  13  can be suppressed. In other words, when sensor support wires  13  are each shortened in length, bone conduction microphone  2  enables each of sensor support wires  13  to be made of a thinner wire. This enables further suppressing obstruction of a field of view. 
     Wireless module  25  and battery  26  may be provided in headband  11  or in support frame  12  as in the first exemplary embodiment. 
     Third Exemplary Embodiment 
     Next, a bone conduction microphone of a third exemplary embodiment will be described.  FIG. 3  is a perspective view illustrating a wearing state of the bone conduction microphone of the third exemplary embodiment.  FIG. 4  is a front view illustrating a state of a bone conduction microphone when it is not worn.  FIG. 5A  is a diagram illustrating structure of a connecting portion between a head-worn part body and a support base member in the bone conduction microphone, and is a perspective view seen from the outside (front side).  FIG. 5B  is a diagram illustrating the structure of the connecting portion between the head-worn part body and the support base member in the bone conduction microphone, and is a perspective view seen from the inside (back side).  FIG. 6A  is a schematic view illustrating structure of a clip in a bifurcated shape in the bone conduction microphone, and is a front view illustrating a state in which two arms of the clip are closed by spring force (elastic force) when the clip is not worn.  FIG. 6B  is a schematic view illustrating structure of the clip in a bifurcated shape in the bone conduction microphone, and is a front view illustrating a state in which the two arms of the clip are opened against the spring force when the clip is worn. 
     As illustrated in  FIGS. 3 and 4 , difference between bone conduction microphone  3  of the third exemplary embodiment and bone conduction microphone  2  of the second exemplary embodiment illustrated in  FIG. 2  includes two points below. Specifically, one sensor support rod  16  is provided instead of two sensor support wires  13 , and vibration sensors  15  are attached to a lower end of sensor support rod  16  using clip  17  in a bifurcated shape. Additionally, end portions  12   b  (opposite end portions) of support frame  12  in the left-right direction are connected to headband  11  in a rotatable manner in the up-and-down direction (vertical direction). 
     As illustrated in detail in  FIGS. 5A and 5B , end portions  12   b  of support frame  12  in the left-right direction are connected to respective portions near corresponding end portions  11   b  of headband  11  in the left-right direction, headband  11  being the head-worn part body, in a rotatable manner in the up-and-down direction (arrow A direction) using connecting pin  18 . This enables bone conduction microphone  3  to allow central portion  12   a  of support frame  12  to be adjusted in position in the up-and-down direction (arrow B direction) as illustrated in  FIG. 4 . 
     Sensor support rod  16  is bendable and integrally connected at its upper end to central portion  12   a  of support frame  12 . Sensor support rod  16  may be formed by resin molding integrally with support frame  12 . As illustrated in  FIG. 6A , sensor support rod  16  is provided at its lower end with clip  17  in a bifurcated shape. Clip  17  in a bifurcated shape includes two arms  17   a  extending downward and generates urging force F in a direction of closing two arms  17   a.  Two arms  17   a  of clip  17  have respective leading ends to which corresponding left and right vibration sensors  15  are attached, vibration sensors  15  coming into contact with corresponding left and right sides of nose  205 . Here, sensor support rod  16  and clip  17  in a bifurcated shape constitute a sensor support. 
     Conductor wires  21  coming out of respective vibration sensors  15  passes through corresponding arms  17   a  of clip  17  and are combined into one conductor wire  22  inside sensor support rod  16 . Then, conductor wire  22  passes through support frame  12 , a rotary connecting portion using connecting pin  18 , and headband  11  in this order to be connected to wireless module  25 . 
     Bone conduction microphone  3  includes support frame  12  that is rotatable in the up-and-down direction, and sensor support rod  16  that is bendable. Thus, when a wearer wears this bone conduction microphone  3 , bone conduction microphone  3  enables each of vibration sensors  15  to easily come into contact with nose  205  at an appropriate position with good sensitivity from an appropriate direction by adjusting a position of support frame  12  in the up-and-down direction and bending sensor support rod  16  even when head  201  is individually different in size and nose  205  is individually different in size and position. 
     Bone conduction microphone  3  includes vibration sensors  15  that are attached to respective leading ends of arms  17   a,  which generates urging force F, of clip  17  in a bifurcated shape, so that vibration sensors  15  each can be pressed against nose  205  with appropriate pressing force as illustrated in  FIG. 6B . Thus, bone conduction microphone  3  is excellent in wearability, and enables vibration of skin on the nasal bone to be appropriately picked up with good sensitivity, and also enables reducing individual difference in sensitivity of vibration sensor  15  regardless of the size of nose  205 . 
     Bone conduction microphone  3  enables conductor wire  22  to be hidden to be invisible from the outside by allowing conductor wire  22  to pass through sensor support rod  16 , and enables conductor wires  21  protruding from respective vibration sensors  15  to be easily combined into one conductor wire within a range of length of sensor support rod  16 . 
     Bone conduction microphone  3  includes sensor support rod  16  that may be composed of a metal wire, and clip  17  that may be integrally formed with sensor support rod  16 . 
     Fourth Exemplary Embodiment 
     Next, a bone conduction microphone of a fourth exemplary embodiment will be described.  FIG. 7  is a front view illustrating a state of the bone conduction microphone of the fourth exemplary embodiment when it is not worn. 
     As illustrated in  FIG. 7 , bone conduction microphone  4  of the fourth exemplary embodiment is different from bone conduction microphone  3  of the third exemplary embodiment illustrated in  FIG. 3  in that sensor support rod  16  is connected to support frame  32  (an example of the support base member) in a rotatable manner in the up-and-down direction. 
     Support frame  32  is divided at its center into left and right frames  32   a,    32   a  at an interval, and bearing holes  32   c,    32   c  are provided at the left and right divided end portions  32   b,    32   b,  respectively. Then, sensor support rod  16  has an upper end portion formed in a T-shaped bar shape, and two shaft portions  16   c,    16   c  protruding to the left and right are inserted into corresponding bearing holes  32   c,    32   c  of left and right frames  32   a,    32   a.  This allows sensor support rod  16  to be connected to support frame  12  in a rotatable manner in the up-and-down direction (arrow D direction). In this case, headband  11  and support frame  32  constitute a head-worn part, and headband  11  corresponds to the head-worn part body. 
     Conductor wires  21  coming out of respective vibration sensors  15  pass through corresponding arms  17   a  of clip  17  in a bifurcated shape and are combined into one conductor wire  22  inside sensor support rod  16 . Then, conductor wire  22  is guided to support frame  12  through shaft portion  16   a  and bearing hole  32   c,  and passes through a rotary connecting portion using connecting pin  18 , and headband  11  in this order to be connected to wireless module  25 . Conductor wire  22  may be wired without passing through a rotation mechanism portion. 
     When a wearer wears this bone conduction microphone  4 , bone conduction microphone  4  enables each of vibration sensors  15  to easily come into contact with nose  205  at an appropriate position by rotating sensor support rod  16  in the up-and-down direction even when nose  205  is individually different in size and position. That is, bone conduction microphone  4  facilitates adjusting a position and pressure at which vibration sensors  15  come into contact with nose  205 . 
     Fifth Exemplary Embodiment 
     Next, a headset including a bone conduction microphone will be described as a fifth exemplary embodiment.  FIG. 8  is a perspective view illustrating a wearing state of bone conduction headset  5  configured using bone conduction microphone  2  of the second exemplary embodiment as the fifth exemplary embodiment. The bone conduction headset may be configured using the bone conduction microphone of another exemplary embodiment. 
     As illustrated in  FIG. 8 , bone conduction headset  5  of the fifth exemplary embodiment is different from bone conduction microphone  2  of the second exemplary embodiment illustrated in  FIG. 2  in that bone conduction speaker  50  is additionally provided. 
     Bone conduction speaker  50  is supported with arm  51  extending from a left end portion of headband  11  to be able to come into contact with a portion with a bone near an ear, such as a portion in front of or behind the ear. Bone conduction speaker  50  is electrically connected to wireless module  25  to acquire a voice signal from wireless module  25 , and then outputs the voice signal by generating vibration corresponding to the audio signal. 
     When a wearer wears this bone conduction headset  5 , bone conduction headset  5  enables transmitting desired sounds clearly to wearer  200  by bone conduction using bone conduction speaker  50  even in a situation with a large ambient noise. 
     As described above, even when corrective glasses or dust-proof glasses are worn, the bone conduction microphone and the bone conduction headset described in each of the above exemplary embodiments can be worn above the glasses without interfering with the glasses. The bone conduction microphone and the bone conduction headset also can bring each of vibration sensors  15  into contact with the nose at a proper position, and can detect vibration of skin of the nose at the time of nasal resonance. 
     Although the exemplary embodiments have been described above with reference to the drawings, it is needless to say that the present disclosure is not limited to such examples. It is obvious to those skilled in the art that various modification examples, modification examples and corrective examples can be conceived within the scope of claims, and thus it is obviously understood that those examples belong to the technical scope of the present disclosure. 
     At least some of the above exemplary embodiments may be combined with another exemplary embodiment. 
     As described above, the bone conduction microphone of each of the above exemplary embodiments may include vibration sensor  15  that comes into contact with nose  205  of a human body (an example of a living body, such as wearer  200 ) from outside the human body and converts vibration of skin on a nasal bone to an electric signal, head-worn part  10  to be worn on the head of the human body above the nose, and a sensor support (e.g., sensor support wire  13  and sensor support rod  16  provided at its lower end with clip  17 ) extending downward from head-worn part  10  to support vibration sensor  15  toward nose  205 . 
     As a result, even when corrective glasses or dust-proof glasses are worn, the bone conduction microphone can be worn above the glasses without interfering with the glasses. That is, the bone conduction microphone can be worn regardless of whether a wearer wears glasses. Even when glasses are worn, the bone conduction microphone can prevent vibration sensor  15  from interfering with a nose pad portion of the glasses by adjusting a position at which vibration sensor  15  comes into contact with the nose. Thus, the bone conduction microphone can suppress decrease in detection accuracy of vibration sensor  15 . The bone conduction microphone can adjust the position at which the vibration sensor comes into contact with the nose by providing the sensor support with an adjustment function. Thus, the bone conduction microphone enables vibration sensor  15  to come into close contact with a position with high sensitivity in accordance with a position and a size of nose  205 , and enables vibration of skin on the nasal bone to be appropriately picked up. 
     The sensor support may extend downward from its upper end connected to head-worn part  10  and pass through a portion in front of glabella  204  of head  201  of the human body to support vibration sensor  15 . 
     As a result, the bone conduction microphone includes the sensor support that passes through between both eyes, so that limitation of a field of view can be suppressed as much as possible. 
     Head-worn part  10  may include a head-worn part body (e.g., headband  11 ) to be worn on head  201 , and a support base member (e.g., support frame  12 ) that is supported by the head-worn part body when being connected to end portions  11   b  (opposite end portions) of the head-worn part body in the left-right direction positioned near a temporal region when the head-worn part body is worn on head  201 , the support base member allowing central portion  11   a  to be located in front of forehead  203  of head  201  of the human body in a noncontact manner in a floating state and being connected to an upper end of the sensor support. 
     As a result, the upper end of the sensor support is connected to the support base member located in front of forehead  203  in a noncontact manner in a floating state when being worn, so that vibration, such as scratching noise at a worn portion that may occur in head-worn part  10 , is less likely to be transmitted to vibration sensor  15  through the sensor support. This causes the bone conduction microphone to be less likely to pick up noise, so that detection accuracy of nasal bone vibration can be improved. The bone conduction microphone includes the sensor support that hangs down from central portion  12   a  of the support base member protruding in front of forehead  203 , so that the sensor support can be hung down at an angle toward the nose from the front of forehead  203 , i.e., toward a direction (rear) in which sensor support wires  13  gradually approaches face  202  from the front of face  202 , unlike the sensor support that is hung down from directly above the nose and being parallel to face  202 . Thus, the bone conduction microphone allows vibration sensor  15  to be likely to press against nose  205  more appropriately. 
     The upper end of the sensor support is connected to the support base member located in front of forehead  203 , so that the bone conduction microphone enables the sensor support extending from the support base member to vibration sensor  15  to be shortened in length. For example, when the sensor support is made of a thin tubular wire, increase in length reduces strength thereof. This may cause improper pressing of vibration sensor  15  against nose  205 . In contrast, the bone conduction microphone enables the sensor support to be shortened in length, so that decrease in strength of the sensor support can be suppressed. In other words, when the sensor support is shortened in length, the bone conduction microphone enables the sensor support to be made of a thinner wire. 
     Opposite end portions of the support base member may be connected to the head-worn part body in a rotatable manner in the up-and-down direction. 
     As a result, even when the head is individually different in size and the nose is individually different in size and position, the bone conduction microphone enables vibration sensor  15  to come into contact with nose  205  at an appropriate position by adjusting a position of the support base member in the up-and-down direction. Thus, the bone conduction microphone can be improved in wearability. 
     The sensor support may be connected to the support base member in a rotatable manner in the up-and-down direction. 
     As a result, the bone conduction microphone enables vibration sensor  15  to easily come into contact with the nose at an appropriate position by rotating the sensor support even when nose  205  is individually different in size and position. That is, the bone conduction microphone facilitates adjusting a position and pressure at which vibration sensor  15  come into contact with the nose. 
     The sensor support is bendable, and conductor wire  21  for transmitting a signal from vibration sensor  15  to head-worn part  10  may be allowed to pass through inside the sensor support. 
     As a result, the sensor support is bendable, so that the bone conduction microphone enables vibration sensor  15  to be adjusted in position and orientation by adjusting a degree of curvature of the sensor support. Thus, vibration sensor  15  can be easily pressed against nose  205  at an appropriate position from an appropriate direction. The bone conduction microphone enables conductor wire  21  to be hidden to be invisible from the outside by allowing conductor wire  21  to pass through the sensor support, and enables conductor wires  21  protruding from respective vibration sensors  15  to be easily combined into one conductor wire within a range of length of the sensor support. 
     The bone conduction microphone may be configured such that the sensor support has a lower end portion provided with clip  17  that generates urging force F in a direction of closing two arms  17   a  extending downward. Arms  17   a  of clip  17  may have respective leading ends to which corresponding left and right vibration sensors  15  are attached, vibration sensors  15  coming into contact with corresponding left and right sides of nose  205 . 
     As a result, the bone conduction microphone includes vibration sensors  15  that are attached to respective leading ends of arms  17   a,  which generates urging force F, of clip  17  in a bifurcated shape, so that vibration sensors  15  each can be pressed against nose  205  with appropriate pressing force. Thus, the bone conduction microphone enables vibration of skin on the nasal bone to be appropriately picked up with good sensitivity, and also enables reducing individual difference in sensitivity of vibration sensor  15  regardless of a size of nose  205 . 
     Bone conduction headset  5  of the above exemplary embodiment may include: vibration sensor  15  that comes into contact with nose  205  of a human body from outside the human body and converts vibration into an electric signal; head-worn part  10  that is worn on head  201  of the human body above nose  205 ; a sensor support that extends downward from head-worn part  10  and supports vibration sensor  15  toward nose  205 ; and bone conduction speaker  50  that is connected to head-worn part  10  and outputs a voice signal by vibration. 
     As a result, even when corrective glasses or dust-proof glasses are worn, bone conduction headset  5  can be worn above the glasses without interfering with the glasses. That is, bone conduction headset  5  can be worn regardless of whether a wearer wears glasses. Even when glasses are worn, bone conduction headset  5  can prevent vibration sensor  15  from interfering with a nose pad portion of the glasses by adjusting a position at which vibration sensor  15  comes into contact with the nose. Thus, bone conduction headset  5  can suppress decrease in detection accuracy of vibration sensor  15 . Bone conduction headset  5  can adjust the position at which vibration sensor  15  comes into contact with nose  205  by providing the sensor support with an adjustment function. Thus, bone conduction headset  5  enables vibration sensor  15  to come into close contact with a position with high sensitivity in accordance with a position and a size of nose  205 , and enables vibration of skin on the nasal bone to be appropriately picked up. Even in a situation where an ambient sound is loud and a wearer is less likely to hear, bone conduction headset  5  enables transmitting desired sounds clearly to the wearer by bone conduction using bone conduction speaker  50 . 
     The present disclosure is useful for a bone conduction microphone, a bone conduction headset, and the like that allow the bone conduction microphone to be separately worn and can suppress decrease in detection accuracy of vibration of skin on the nasal bone even when a living body wears glasses.