WO2021134170A1 - 骨传导麦克风 - Google Patents

骨传导麦克风 Download PDF

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Publication number
WO2021134170A1
WO2021134170A1 PCT/CN2019/129821 CN2019129821W WO2021134170A1 WO 2021134170 A1 WO2021134170 A1 WO 2021134170A1 CN 2019129821 W CN2019129821 W CN 2019129821W WO 2021134170 A1 WO2021134170 A1 WO 2021134170A1
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WO
WIPO (PCT)
Prior art keywords
pressure device
bone conduction
cavity
conduction microphone
microphone according
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PCT/CN2019/129821
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English (en)
French (fr)
Inventor
张金宇
王凯
Original Assignee
瑞声声学科技(深圳)有限公司
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Application filed by 瑞声声学科技(深圳)有限公司 filed Critical 瑞声声学科技(深圳)有限公司
Priority to PCT/CN2019/129821 priority Critical patent/WO2021134170A1/zh
Publication of WO2021134170A1 publication Critical patent/WO2021134170A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor

Definitions

  • This application relates to a bone conduction microphone, and specifically refers to a bone conduction microphone with a novel suspension member.
  • the mass is fixed on the suspension member so as to be able to move in response to vibration.
  • the movement of the mass block is restricted by the suspension member.
  • the fixed end of the suspension member is prone to material fatigue due to stress concentration, or deforms or breaks when the bone conduction microphone falls.
  • the purpose of this application is to provide a bone conduction microphone to solve the technical problem that the fixed end of the suspension member in the traditional bone conduction microphone is prone to material fatigue due to stress concentration.
  • a bone conduction microphone including:
  • a first pressure device having a first cavity
  • a second pressure device having a second cavity and fixedly connected to the first pressure device is provided with a sound hole that allows the second cavity to communicate with the first cavity for picking up and connecting with the first pressure device.
  • the first pressure device includes a shell surrounding the first cavity, and a mass and a suspension member housed in the first cavity;
  • the suspension member includes a fixing part located at a central position and opposite to the sound hole, a folding ring surrounding the fixing part, and a supporting part surrounding the folding ring and fixed to the housing;
  • the mass block is fixed to the fixed part and can be displaced relative to the second pressure device to generate the pressure change after responding to vibration.
  • the above-mentioned bone conduction microphone adopts a suspension member with a folding ring, so that the stress generated by the movement of the mass can be effectively distributed in the entire folding ring area, the stress is relatively dispersed, and material fatigue, deformation or fracture is not easy to occur.
  • Figure 1 is a three-dimensional exploded schematic diagram of the bone conduction microphone of this application.
  • Fig. 2 is a three-dimensional schematic diagram of the bone conduction microphone of the present application, which shows the three-dimensional view when the housing is removed;
  • Figure 3 is a front view of the bone conduction microphone of the application
  • Figure 4 is a cross-sectional view taken along the line A-A in Figure 3;
  • Fig. 5 is a side view of the bone conduction microphone shown in Fig. 3;
  • Figure 6 is a cross-sectional view taken along the line B-B in Figure 6;
  • Fig. 7 is a schematic diagram of an enlarged structure of part I in Fig. 6;
  • Figure 8 is a partial cross-sectional view of a folding ring in an embodiment of this application.
  • Fig. 9 is a partial cross-sectional view of a folding ring in another embodiment of the application.
  • the bone conduction microphone 100 is used for bone conduction transmission.
  • the bone conduction microphone 100 includes a first pressure device 110 having a first cavity and a second pressure device 120 having a second cavity and fixedly connected to the first pressure device 110.
  • the second pressure device 120 is provided with an acoustic hole 121 that connects the second cavity with the first cavity, and is used to pick up the pressure change generated between the second pressure device 110 and the first pressure device 110 and convert the pressure change into an electrical signal.
  • the second pressure device 120 is a MEMS microphone 120.
  • the first pressure device 110 includes a housing 111 enclosed as a first cavity, and a mass 112 and a suspension member 113 housed in the first cavity.
  • the suspension member 113 is the diaphragm 113, which includes a fixing portion 1131 located at the central position and opposite to the sound hole 121, a folding ring 1132 surrounding the fixing portion 1131, and a supporting portion surrounding the folding ring 1132 and fixed to the housing 111 1133.
  • the mass 112 is fixed to the fixing part 1131.
  • the diaphragm 113 is connected to the MEMS microphone 120 through the supporting portion 1133.
  • the diaphragm 113 is circumferentially connected to the upper end of the MEMS microphone 120 through the supporting portion 1133.
  • the diaphragm 113 with the folding ring 1132 is adopted, so that the stress generated by the movement of the mass 112 can be effectively distributed in the entire folding ring 1132 area, the stress is relatively dispersed, and the material fatigue, deformation or fracture is not easy to occur.
  • the inner edge 1133 a of the supporting portion 1133 is suspended above the MEMS microphone 120.
  • the inner edge 1133a of the supporting portion 1133 is connected to the folding ring 1132. This makes the folding ring 1132 and the inner edge 1133a of the supporting portion 1133 a non-rigid connection, which is more conducive to preventing stress concentration.
  • the diaphragm 113 is generally fixed by glue. Because the shape of the glue is difficult to control, the consistency of the bone conduction microphone 100 is poor. In this embodiment, the structure and shape of the supporting portion 1133 are controllable, which solves the problem of poor consistency of traditional bone conduction microphones.
  • a housing 111 is covered above the mass 112. Specifically, the housing 111 may cover the upper end of the MEMS microphone 120 to form a first cavity.
  • the housing 111 has an upwardly convex housing body 1111 so that the mass 112 does not contact the housing 111 when it reaches the top dead center.
  • the housing body 1111 is provided with a fixed end 1112 of the housing 111 in the circumferential direction.
  • the supporting portion 1133 is pressed against the circumferential direction of the upper end of the MEMS microphone 120 by the fixed end 1112 of the housing 111.
  • a gasket 130 is also provided between the supporting portion 1133 and the upper end of the MEMS microphone 120.
  • the washer 130, the diaphragm 113, and the second cavity constitute an air cavity 131.
  • the pressure change is generated in the air cavity 131.
  • the mass 112 is displaced relative to the MEMS microphone 120.
  • the gas in the air cavity 131 is compressed and stretched, and the pressure changes periodically. This in turn produces pressure changes.
  • the folding ring 1132 protrudes away from the second pressure device 120.
  • the folding ring 1132 has a top part 1132a close to the housing 111 in the direction of vibration, and a top part 1132a connected to the top part 1132a and disposed opposite to each other.
  • the top portion 1132a, the first side portion 1132b, and the second side portion 1132c constitute a folding ring 1132.
  • An end of the first side subsection 1132b away from the top subsection 1132a is connected to the outer edge 1131a of the fixing portion 1131.
  • An end of the second side portion 1132c away from the top portion 1132a is connected to the inner edge 1133a of the support portion 1133.
  • the included angle range between the bus bar of the first side subdivision 1132b and the outer edge 1131a of the fixing portion 1131 is greater than 90° and less than 180°.
  • the fixing part 1131 is used to connect with the mass 112. In order to avoid unnecessary vibration, the mass 112 needs to be attached to the fixed portion 1131.
  • the shape of the joint between the fixed part 1131 and the mass 112 depends on the shape of the joint 112.
  • the topography can be flat, concave, convex, corrugated or wavy.
  • the positional relationship between the bus bar of the first side subdivision 1132b and the outer edge 1131a of the fixed portion 1131 can be ignored by the specific shape of the fixed portion 1131, and the bus bar of the first side subdivision 1132b and the outer edge of the fixed portion 1131 It is defined along the positional relationship between the planes enclosed by 1131a.
  • the included angle range between the bus bar of the second side subdivision 1132c and the plane enclosed by the inner edge 1133a of the supporting portion 1133 is greater than 0° and less than 90°.
  • the positional relationship between the bus bar of the second side subsection 1132c and the inner edge 1133a of the support portion 1133 may not consider the specific shape of the support portion 1133.
  • the positional relationship between the planes enclosed by the inner edge 1133a is defined.
  • the mass 112 is a rectangular parallelepiped.
  • the mass 112 has four side planes 1121 that are parallel to each other in pairs, side arcs 1122 connected between adjacent side planes 1121, and a bottom surface 1123 and a top surface 1124 that are parallel to each other.
  • the fixing portion 1131, the top portion 1132 a and the supporting portion 1133 are all planar and parallel to each other, and the bottom surface 1123 is attached to the fixing portion 1131.
  • the bottom surface 1123 may be attached to the entire fixing portion 1131 or only a part of the fixing portion 1131.
  • the outer edge of the bottom of the mass 112 coincides with the outer edge 1131a of the fixed portion 1131, that is, the outer edge of the bottom surface 1123 coincides with the outer edge 1131a of the fixed portion 1131.
  • the vertical distance from the top portion 1132 a to the fixed portion 1131 is equal to the thickness of the mass 112. Therefore, during the movement of the mass 112, the angle between the bus bar of the first side subdivision 1132b and the aforementioned side plane 1121 and the side arc surface 1122 will change, thereby changing the first side subdivision 1132b and the top subdivision 1132a.
  • the shapes of the outer edge 1131a of the fixing portion 1131, the inner edge of the top portion 1132a, the inner edge 1133a of the support portion 1133, and the inner edge of the gasket 130 are gradually enlarged in proportions to better relieve stress concentration. Further, the included angle between the bus bar of the first side subsection 1132b and the plane where the top subsection 1132a is located is equal to the included angle between the bus bar of the second side subsection 1132c and the plane where the top subsection 1132a is located, so that the folding ring 1132 is deformed. The force is more even in the process.
  • the fixing portion 1131 and the supporting portion 1133 are located in the same plane.
  • the first side subdivision 1132b and the second side subdivision 1132c are arranged in mirror symmetry, that is, the cross section of the folding ring 1132 is an isosceles trapezoid.
  • the cross-sectional shape of the folding ring 1132 may also be in other forms, for example, as shown in FIG.
  • the plane where the support portion 1133 is located is between the plane where the top subsection 1132a is located and the plane where the fixed portion 1131 is located.
  • the plane where the fixed portion 1131 is located is between the plane where the top subsection 1132a is located and the plane where the support portion 1133 is located. between.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Micromachines (AREA)

Abstract

本申请提供了一种骨传导麦克风，包括具有第一腔体的第一压强装置以及具有第二腔体且与第一压强装置固定连接的第二压强装置，其设有使得第二腔体与第一腔体连通的声孔，用于拾取与第一压强装置之间产生的压强变化，并将压强变化转化为电信号；第一压强装置包括围设成第一腔体的外壳以及收容于第一腔体内的质量块和悬挂构件；悬挂构件包括位于中央位置且与声孔相对设置的固定部、环绕固定部的折环以及环绕折环并固定于外壳的支撑部；质量块固定于固定部且能够在响应于振动后相对第二压强装置发生位移以产生压强变化。采用具有折环的悬挂构件，使得因质量块的移动产生的应力可在整个折环区域有效分布，应力较分散，不易发生材料疲劳。

Description

骨传导麦克风 技术领域
本申请涉及一种骨传导麦克风，具体指一种具有新型悬挂构件的骨传导麦克风。
 背景技术
传统的骨传导麦克风中质量块固定在悬挂构件上，以能够在响应于振动后发生移动。质量块的移动受悬挂构件限制，在发生移动的过程中悬挂构件的固定端因应力集中而容易发生材料疲劳，或者在骨传导麦克风跌落时发生变形或者断裂。
 技术问题
因此，有必要提供一种具有新型悬挂构件的骨传导麦克风。
 技术解决方案
本申请的目的在于提供一种骨传导麦克风，以解决传统的骨传导麦克风中悬挂构件的固定端因应力集中而容易发生材料疲劳的技术问题。
为实现上述目的，本申请的技术方案如下：
一种骨传导麦克风，包括：
具有第一腔体的第一压强装置；以及
具有第二腔体且与所述第一压强装置固定连接的第二压强装置，其设有使得所述第二腔体与所述第一腔体连通的声孔，用于拾取与所述第一压强装置之间产生的压强变化，并将所述压强变化转化为电信号；
所述第一压强装置包括围设成所述第一腔体的外壳以及收容于所述第一腔体内的质量块和悬挂构件；
所述悬挂构件包括位于中央位置且与所述声孔相对设置的固定部、环绕所述固定部的折环以及环绕所述折环并固定于所述外壳的支撑部；
所述质量块固定于所述固定部且能够在响应于振动后相对所述第二压强装置发生位移以产生所述压强变化。
 有益效果
本申请的有益效果在于：
上述骨传导麦克风，通过采用具有折环的悬挂构件，使得因质量块的移动产生的应力可在整个折环区域有效分布，应力较分散，不易发生材料疲劳、变形或断裂。
 附图说明
图1为本申请的骨传导麦克风的立体分解示意图；
图2为本申请的骨传导麦克风的立体示意图，其展示了去除外壳时的立体图；
图3为本申请的骨传导麦克风的主视图；
图4为图3中A-A向的剖视图；
图5为图3所示的骨传导麦克风的侧视图；
图6为图6中B-B向的剖视图；
图7为图6中I部放大结构示意图；
图8为本申请的一实施方式中折环的局部剖视图；
图9为本申请的另一实施方式中折环的局部剖视图。
 本发明的实施方式
下面结合附图和实施方式对本申请作进一步说明。
请一并结合图1-图7，现对本申请提供的骨传导麦克风进行说明。骨传导麦克风100用于骨传导送话。骨传导麦克风100包括具有第一腔体的第一压强装置110和具有第二腔体且与第一压强装置110固定连接的第二压强装置120。第二压强装置120设有使得第二腔体与第一腔体连通的声孔121，用于拾取与第一压强装置110之间产生的压强变化，并将压强变化转化为电信号。本实施例中，第二压强装置120为MEMS麦克风120。
第一压强装置110包括围设成第一腔体的外壳111以及收容于第一腔体内的质量块112和悬挂构件113。本实施例中，悬挂构件113为振膜113，包括位于中央位置且与声孔121相对设置的固定部1131、环绕固定部1131的折环1132以及环绕折环1132并固定于外壳111的支撑部1133。质量块112固定于固定部1131。骨导信号以振动加速度的方式传递至骨传导麦克风100时，质量块112响应于振动后相对MEMS麦克风120发生位移。质量块112和MEMS麦克风120之间的气体被压缩和拉伸，压强发生周期变化。之后，压强变化被MEMS麦克风120拾取，转化为电信号。
进一步地，振膜113通过支撑部1133与MEMS麦克风120连接。本实施例中，振膜113通过支撑部1133与MEMS麦克风120的上端周向连接。采用具有折环1132的振膜113，使得因质量块112的移动产生的应力可在整个折环1132区域有效分布，应力较分散，不易发生材料疲劳、变形或断裂。支撑部1133的内沿1133a悬置于MEMS麦克风120上方。支撑部1133的内沿1133a与折环1132连接。使得折环1132与支撑部1133的内沿1133a之间为非刚性连接，更有利于防止应力集中。
传统的骨传导麦克风100中，一般采用打胶的方式将振膜113固定，由于打胶形貌难以控制，造成骨传导麦克风100一致性较差。本实施例中，支撑部1133的结构、形貌可控，解决了传统的骨传导麦克风一致性较差的问题。
进一步地，质量块112的上方罩有外壳111。具体地，外壳111可将MEMS麦克风120的上端盖合以形成第一腔体。外壳111具有上凸的外壳本体1111，以使得质量块112到达上止点时不与外壳111接触。外壳本体1111周向设有外壳111的固定端1112。支撑部1133通过外壳111的固定端1112压紧在MEMS麦克风120上端周向上。支撑部1133与MEMS麦克风120上端之间还设置有垫圈130。垫圈130和振膜113以及第二腔体构成一气腔131。压强变化在气腔131内产生。具体地，质量块112相对MEMS麦克风120发生位移。气腔131内的气体被压缩和拉伸，压强发生周期变化。进而产生压强变化。
请一并结合图1、图2、图4、图6和图7。本实施例中，折环1132向远离所述第二压强装置120方向凸起，折环1132具有沿振动方向靠近所述外壳111的顶分部1132a，以及连接于顶分部1132a且相对设置的第一侧分部1132b和第二侧分部1132c。顶分部1132a、第一侧分部1132b和第二侧分部1132c构成折环1132。第一侧分部1132b的远离顶分部1132a的一端与固定部1131的外沿1131a连接。第二侧分部1132c的远离顶分部1132a的一端与支撑部1133的内沿1133a连接。通过上述设置，不仅使得因质量块112的移动产生的应力可在整个折环1132区域有效分布，而且还可以通过改变顶分部1132a、第一侧分部1132b、第二侧分部1132c、固定部1131、折环1132和支撑部1133的形状、尺寸、夹角以及支撑部1133的内沿1133a悬置位置，使得应力得到更优分布，质量块112的移动得到定量控制。
具体地，第一侧分部1132b的母线与固定部1131的外沿1131a所围平面的夹角范围为大于90°小于180°。固定部1131用于与质量块112连接。为了避免发生不必要的振动，质量块112需要与固定部1131贴合。固定部1131与质量块112的贴合处的形貌取决于质量块112在贴合处的形貌。该形貌可以为平面、凹面、凸面，波纹或波浪面等。因此，第一侧分部1132b的母线与固定部1131的外沿1131a之间的位置关系，可以不考虑固定部1131的具体形貌，通过第一侧分部1132b的母线与固定部1131的外沿1131a所围平面之间的位置关系来限定。
进一步地，第二侧分部1132c的母线与支撑部1133的内沿1133a所围平面的夹角范围为大于0°小于90°。同理，第二侧分部1132c的母线与支撑部1133的内沿1133a之间的位置关系，可以不考虑支撑部1133的具体形貌，通过第二侧分部1132c的母线与支撑部1133的内沿1133a所围平面之间的位置关系来限定。
本实施例中，质量块112呈类长方体，质量块112具有两两互相平行的四个侧平面1121、连接在相邻侧平面1121之间侧弧面1122以及互相平行的底面1123和顶面1124。固定部1131、顶分部1132a和支撑部1133均呈平面状且互相平行，底面1123与固定部1131贴合。底面1123可以与整个固定部1131贴合或者只是与部分固定部1131贴合。
本实施例中，质量块112的底部的外沿与固定部1131的外沿1131a重合，即底面1123的外沿与固定部1131的外沿1131a重合。顶分部1132a到固定部1131的垂直距离等于质量块112的厚度。因此，在质量块112移动过程中，第一侧分部1132b的母线与上述侧平面1121和侧弧面1122之间的夹角会发生改变，进而改变第一侧分部1132b与顶分部1132a的夹角、顶分部1132a与第二侧分部1132c的夹角以及第二侧分部1132c的母线与支撑部1133之间的夹角，以缓解应力集中。由于质量块112的底部的外沿与固定部1131的外沿1131a重合，使得在质量块112移动过程中，第一侧分部1132b对质量块112有一定的包覆，对质量块112的移动起到一定的指向作用。
本实施例中，固定部1131的外沿1131a，顶分部1132a的内沿、支撑部1133的内沿1133a和垫圈130的内沿的形状等比例逐渐放大，以更好的缓解应力集中。进一步地，第一侧分部1132b的母线与顶分部1132a所在平面的夹角与第二侧分部1132c的母线与所述顶分部1132a所在平面的夹角相等，使得折环1132在形变过程中受力更均匀。
本实施例中，固定部1131和支撑部1133位于同一平面内。第一侧分部1132b和第二侧分部1132c为镜面对称设置，即折环1132的截面呈等腰梯形。可以理解为在其他实施例中，由于支撑部1133所在平面，顶分部1132a所在平面和固定部1131所在平面之间的位置关系，折环1132的截面形状还可以是其他形式，例如，如图8所示，支撑部1133所在平面位于顶分部1132a所在平面和固定部1131所在平面之间，如图9所示，固定部1131所在平面位于顶分部1132a所在平面和支撑部1133所在平面之间。
以上所述的仅是本申请的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本申请创造构思的前提下，还可以做出改进，但这些均属于本申请的保护范围。

Claims (11)

  1. 一种骨传导麦克风，其特征在于，包括：
    具有第一腔体的第一压强装置；以及
    具有第二腔体且与所述第一压强装置固定连接的第二压强装置，其设有使得所述第二腔体与所述第一腔体连通的声孔，用于拾取与所述第一压强装置之间产生的压强变化，并将所述压强变化转化为电信号；
    所述第一压强装置包括围设成所述第一腔体的外壳以及收容于所述第一腔体内的质量块和悬挂构件；
    所述悬挂构件包括位于中央位置且与所述声孔相对设置的固定部、环绕所述固定部的折环以及环绕所述折环并固定于所述外壳的支撑部；
    所述质量块固定于所述固定部且能够在响应于振动后相对所述第二压强装置发生位移以产生所述压强变化。
  2. 根据权利要求1所述的骨传导麦克风，其特征在于：所述折环向远离所述第二压强装置方向凸起。
  3. 根据权利要求1所述的骨传导麦克风，其特征在于：所述折环具有沿振动方向靠近所述外壳的顶分部，以及连接于所述顶分部且相对设置的第一侧分部和第二侧分部；
    所述第一侧分部的远离所述顶分部的一端与所述固定部的外沿连接，所述第二侧分部的远离所述顶分部的一端与所述支撑部的内沿连接。
  4. 根据权利要求3所述的骨传导麦克风，其特征在于：所述第一侧分部的母线与所述固定部的外沿所围平面的夹角范围为大于90°且小于180°；
    所述第二侧分部的母线与所述支撑部的内沿所围平面的夹角范围为大于0°且小于90°。
  5. 根据权利要求4所述的骨传导麦克风，其特征在于：所述第二压强装置为MEMS麦克风。
  6. 根据权利要求3-5任一权利要求所述的骨传导麦克风，其特征在于：所述固定部、所述顶分部和所述支撑部均呈平面状且互相平行，所述质量块的底部与所述固定部远离所述第二压强装置一侧的表面贴合，所述顶分部到所述固定部的垂直距离等于所述质量块的厚度。
  7. 根据权利要求6所述的骨传导麦克风，其特征在于：所述第一侧分部的母线与所述顶分部所在平面的夹角与所述第二侧分部的母线与所述顶分部所在平面的夹角相等。
  8. 根据权利要求7所述的骨传导麦克风，其特征在于：所述固定部和所述支撑部位于同一平面内。
  9. 根据权利要求8所述的骨传导麦克风，其特征在于：所述底部的外沿与所述固定部的外沿重合。
  10. 根据权利要求9所述的骨传导麦克风，其特征在于：所述质量块的上方罩有所述外壳，所述支撑部远离所述第二压强装置的一面与所述外壳的固定端连接；
    所述支撑部通过垫圈与所述第二压强装置连接。
  11. 根据权利要求10所述的骨传导麦克风，其特征在于：所述悬挂构件、所述垫圈和所述第二腔体构成一气腔，所述压强变化在所述气腔内产生。
PCT/CN2019/129821 2019-12-30 2019-12-30 骨传导麦克风 WO2021134170A1 (zh)

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CN202799112U (zh) * 2012-07-26 2013-03-13 瑞声光电科技(常州)有限公司 骨传导振动器
CN208434106U (zh) * 2018-08-01 2019-01-25 歌尔科技有限公司 一种用于振动传感器的振动组件及振动传感器
CN209526886U (zh) * 2019-03-27 2019-10-22 歌尔科技有限公司 一种骨声纹传感器及电子设备
CN209748802U (zh) * 2019-04-30 2019-12-06 歌尔科技有限公司 振膜、扬声器和扬声器模组
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Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201557247U (zh) * 2009-11-09 2010-08-18 常州美欧电子有限公司 振膜和使用该振膜的电声换能器
CN202799112U (zh) * 2012-07-26 2013-03-13 瑞声光电科技(常州)有限公司 骨传导振动器
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