WO2010072142A1 - 一种电容式传声器 - Google Patents

一种电容式传声器 Download PDF

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Publication number
WO2010072142A1
WO2010072142A1 PCT/CN2009/075833 CN2009075833W WO2010072142A1 WO 2010072142 A1 WO2010072142 A1 WO 2010072142A1 CN 2009075833 W CN2009075833 W CN 2009075833W WO 2010072142 A1 WO2010072142 A1 WO 2010072142A1
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WO
WIPO (PCT)
Prior art keywords
circuit board
board substrate
frame
condenser microphone
holding member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2009/075833
Other languages
English (en)
French (fr)
Inventor
孙伟华
魏文滨
姚荣国
王显彬
党茂强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goertek Inc
Original Assignee
Goertek Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Goertek Inc filed Critical Goertek Inc
Priority to KR1020107018196A priority Critical patent/KR101153489B1/ko
Priority to US12/933,318 priority patent/US8693712B2/en
Publication of WO2010072142A1 publication Critical patent/WO2010072142A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00Electrostatic transducers
    • H04R19/04Microphones
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/02Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/04Structural association of microphone with electric circuitry therefor

Definitions

  • the present invention relates to the field of capacitive microphones.
  • the miniature condenser microphones that have appeared on the market are generally in the size of several tens of cubic millimeters.
  • the basic structure is formed by a metal casing and a circuit board.
  • a protective frame is internally mounted with a plastic cavity for supporting and insulating.
  • a metal gate ring is mounted inside the cavity for circuit conduction, and the gate ring is connected to the capacitor component because the internal parts are large in size and large in number.
  • the existing patent CN200710129770.6 proposes a new structure condenser microphone, comprising a circuit board substrate and a frame forming a protection structure, the protection structure is provided with a sound hole for receiving external signals, and a vibrating film is sequentially installed inside, The spacer and the back plate maintain an elastic electrical connection between the elastic holding member formed of a spring material and the circuit board substrate, and the diaphragm can be electrically connected to the circuit board substrate through a circuit inside the frame.
  • This product structure can reduce the size of the product to a certain extent.
  • the back plate of the structure there is a certain gap between the back plate of the structure and the inner side wall of the frame, and the back plate can be freely moved inside the frame, and its position can only be It is ensured by the elasticity of the elastic retaining member.
  • the back plate After the product is in a relatively stable state, the back plate can be stabilized by the elastic holding member and can maintain a good electrical connection with the circuit board substrate.
  • the product is in a state of severe acceleration, such as a drop test, there may be various defects: The large impact force formed by the back plate completely acts on the elastic retaining member, causing the elastic retaining member to undergo excessive compression and excessive deformation, resulting in a decrease in rebound resilience.
  • the electrical connection between the circuit board substrate and the back plate is unstable or even broken; the position of the circuit board near the center is caused by the installation of the amplifier device, and the large impact force is easily formed.
  • the position of the board substrate mounting amplifier device is deformed to the side of the back plate, which is also liable to cause compression deformation of the holding member, which may eventually cause the back plate and the amplifier device to collide, thereby causing the destruction of the amplifier device and the like.
  • the technical problem to be solved by the present invention is to provide a condenser microphone which is more reliable and can withstand large acceleration activities or impact without causing performance degradation or damage.
  • the present invention provides a condenser microphone comprising a circuit board substrate, a housing fixedly coupled to the circuit board substrate, and an amplifier device, an elastic holding member, and a capacitor assembly disposed inside the microphone, wherein Providing an acoustic hole for receiving an external signal on the circuit board substrate or the housing; the elastic holding member is disposed on the amplifier device side or the capacitor assembly side, and the amplifier device and the capacitor assembly are respectively connected to the circuit board substrate Electrical connection, characterized by:
  • the elastic holding member is provided with an auxiliary supporting member, and the vertical height of the auxiliary supporting member is larger than the height of the amplifier device, and smaller than the spacing between the capacitor assembly and the opposite inner wall of the microphone.
  • the elastic holding member further includes a frame and a bent portion; and the capacitor assembly and the circuit board substrate are elastically electrically connected by the bent portion.
  • the elastic holding member includes a frame parallel to a plane of the circuit board substrate and a bent portion extending from the end of the frame; the auxiliary supporting member is disposed on the frame.
  • the elastic end portion of the bent portion has a rounded curved shape.
  • the elastic holding member is an annular sheet frame structure having a curved curved surface, the bent portion is curved and curved, and the auxiliary supporting member is a projection provided on the frame.
  • the capacitor assembly includes a metal ring sequentially mounted from an inner surface of the microphone
  • a preferred structure is that the back plate passes between the elastic holding member and the circuit board substrate (1) Maintain an elastic electrical connection.
  • the frame end is connected to the back plate, and the top of the bent portion is connected to the circuit board substrate.
  • the condenser microphone further includes a metal hole disposed inside the sidewall of the housing, a metal layer disposed between the inner wall of the microphone and the metal ring, and the metal hole cooperates with the metal layer and the metal ring.
  • the diaphragm and the circuit board substrate are electrically connected.
  • the joint of the frame and the bent portion is a curved arc curve; a rounded convex portion is provided at a top end of the curved arched curved portion of the bent portion; at least two auxiliary support members are symmetrically distributed
  • the auxiliary support member is an arcuate projection having a plurality of support legs.
  • FIG. 1 is a schematic structural view showing a first embodiment of the present invention
  • FIG. 2 is a schematic structural view of an elastic holding member according to a first embodiment of the present invention
  • FIG. 3 is a schematic structural view of a product according to a first embodiment of the present invention subjected to an acceleration impact ⁇ ;
  • FIG. 4 is a schematic structural view of a second embodiment of the present invention.
  • Figure 5 is a schematic view showing the structure of an elastic holding member according to a second embodiment of the present invention.
  • Figure 6 is a perspective view showing the elastic holding member of the second embodiment of the present invention.
  • Figure 7 is a schematic view showing the structure of the product according to the second embodiment of the present invention subjected to acceleration shock ⁇ .
  • FIG. 1 is a schematic view showing the structure of a first embodiment of the present invention.
  • the external shape and the inner structure of the condenser microphone provided by the first embodiment are square, and a square-shaped circuit board frame 2 and a square circuit board bottom plate 3 with sound holes 32 constitute a shell.
  • the body, the casing and a square circuit board substrate 1 on which the amplifier device 11 is mounted are combined to form a protective structure of a sandwich shape.
  • the protection structure is internally provided with a capacitor assembly and an elastic holding member 4, wherein the capacitor assembly is mounted on one side of the microphone provided with the sound hole, and is electrically connected to the circuit board substrate 1 on the opposite side, and the elastic holding member 4 is mounted on the mounting There is one side of the amplifier device 11.
  • the capacitor assembly includes a back plate 5, an isolating diaphragm 7, a diaphragm 61, and a metal ring 6 for fixing the diaphragm 61 from top to bottom.
  • the isolation diaphragm is placed between the back plate 5 and the diaphragm 61 to form a parallel plate capacitor.
  • the back plate 5 and the vibrating film 6 are electrically connected to the circuit board substrate, respectively.
  • the elastic holding member 4 includes a frame 41 and a bent portion 42 which is mounted on the circuit board substrate 1 and surrounds In the amplifier device 11, the bent portion 42 is elastically contacted on the back plate 5, and the frame 41 is integrally formed with two symmetrically distributed auxiliary supporting members 43 which are perpendicular to the plane of the frame 41 and are column-shaped and located in the amplifier
  • the side portion of the device 11 has a vertical height greater than the height of the amplifier device 11 and is smaller than the spacing between the circuit board substrate 1 and the back plate 5 that is not impacted by the microphone.
  • the lower end of the auxiliary supporting member 43 does not contact the back plate 5, but is relatively closer to the back plate 5 than the amplifier device 11, so that the condenser microphone is subjected to the drawing 3, the acceleration a in the a direction, the bent portion 42 of the elastic holding member 4 will be deformed by the impact of the back plate 5, and the distance between the back plate 5 and the amplifier device 11 will be rapidly reduced, however when When the pitch is equal to the vertical height of the auxiliary support member 43, the back plate 5 will be in contact with and supported by the auxiliary support member 43, thereby avoiding the impact of the back plate 5 and the amplifier device 11, and avoiding the bent portion of the elastic holding member 4. 42 deformation is too large, causing the rebound resilience to drop, causing hidden dangers in the internal circuit connection of the product.
  • the capacitor assembly in the present invention can be electrically connected to the board substrate 1 in various ways.
  • a metal hole that can conduct electricity is disposed inside the circuit board frame 2, and a metal layer 31 extending to the metal hole is disposed between the inner wall of the microphone and the metal ring 6, so that the metal hole and the metal layer 31 on the circuit board bottom plate 3 are provided.
  • the metal ring 6 is configured to electrically connect the diaphragm 61 and the circuit board substrate 1. That is, the diaphragm 61 is electrically connected to the circuit 12 on the circuit board substrate 1 through the metal ring 6, the metal layer 31 on the circuit board bottom plate 3, and the metal hole 21 provided inside the circuit board frame 2.
  • the back plate 5 can be electrically connected to the circuit board substrate 1 through the bent portion 42 of the metallic elastic holding member 4 provided inside the microphone.
  • the metal hole provided inside the wiring board frame 2 can be formed by a process of drilling a hole in the wiring board substrate.
  • the elastic holding member 4 includes a frame 41 parallel to the plane of the circuit board substrate and a bent portion 42 extending from the side of the frame perpendicularly to the plane of the frame, the auxiliary supporting member 43 Vertically disposed on the frame 41, the auxiliary support member 43 can be ensured to have a relatively stable support, and can better serve as a support; the frame 41 is connected to the circuit board substrate 1, and the bent portion 42 is connected to the back plate. 5, structural and circuit connections are more stable.
  • the elastic end portion of the bent portion 42 is designed to have a rounded curved end portion.
  • the bumps of the rounded curved protrusions of the end portion are electrically connected to the back plate or the circuit board substrate.
  • Elastic holding parts 4 How to install them specifically, can be flexibly designed according to the needs of actual products.
  • the auxiliary supporting member 43 adopts a columnar support, and the elastic holding member 4 has an integral structure, and the auxiliary supporting member 43 can be designed as one to simplify the production process and reduce the production cost; or a plurality of symmetrically distributed designs can be used.
  • the structure is stable and the support effect is good.
  • the outer frame of the condenser microphone includes the casing and the circuit board substrate 1 composed of the circuit board frame 2 and the circuit board bottom plate 3, but those skilled in the art It is understood that the external frame of the condenser microphone can be packaged and implemented in various ways. The position of the circuit board, the setting of the sound hole and the installation position of the amplifier and the capacitor component can be flexibly designed according to the needs of production, installation or use. There are many other implementations of the condenser microphone provided in the first embodiment. The manner in which this embodiment is provided should not be limited to this specific technical solution provided by this embodiment.
  • the second embodiment differs from the first embodiment in that the mounting position and design of the elastic holding member 4 are different.
  • the frame 41 of the elastic holding member 4 is mounted on the side of the amplifier device 11 in the first embodiment
  • the frame 41 of the elastic holding member 4 is mounted on the back plate of the capacitor assembly.
  • the auxiliary supporting member 43 is also supported between the back plate and the inner wall of the microphone provided with the amplifier device at the deformation limit.
  • the position in contact with the apex of the auxiliary supporting member is on the back plate 5, and in the second embodiment The position in contact with the apex of the auxiliary supporting member is on the wiring board substrate 1 on which the amplifier device is provided as the inner wall of the microphone.
  • this mounting method can reduce the parallel area between the elastic holding member 4 and the circuit board substrate 1, and serves to better reduce the parasitic capacitance.
  • the elastic holding member 4 is an annular sheet frame structure which is bent into a curved surface
  • Figs. 5 and 6 are a schematic structural view and a perspective view, respectively, of the elastic holding member of the second embodiment.
  • the elastic holding member 4 includes a substantially planar frame 41, a bent portion 42, a joint portion 44 of the joint frame 41 and the bent portion 42, and an auxiliary support portion 43.
  • the frame 41, the bent portion 42 and the joint portion 44 together form an arched curved surface of a specific height (as shown in FIG. 5 and the hollow portion of the annular frame structure formed by the frame 41, the bent portion 42 and the joint portion 44 is slightly omitted) Larger than the cross section of the amplifier device 11, so that its annular structure can surround the periphery of the amplifier device 11.
  • the auxiliary support portion 43 is an arcuate projection having a plurality of support legs integrally provided on the frame 41 of the elastic holding member 4, and the vertical height of the auxiliary support portion 43 is larger than the height of the amplifier device 11, which is smaller than the microphone is not subjected to impact.
  • the elastic holding member 4 of such an annular frame structure surrounds the amplifier device 11, and the internal space of the condenser microphone can be fully utilized, so that the size of the condenser microphone product is further thinned, and the curved surface Elastic retaining member of the annular sheet frame structure is stable and elastic Good, more suitable for small size product applications.
  • the joint portion 44 of the frame 41 and the bent portion 42 is curved in a rounded curve to ensure a better elastic effect;
  • the auxiliary support member 43 is an arcuate projection having a plurality of support legs, and the structure is stable.
  • the elastic retaining member in this embodiment can be integrally formed by a stamping process, and the process steps are simpler, which in turn reduces the production cost.
  • FIG. 7 is a schematic view showing the structure of the product of the present embodiment subjected to acceleration shock ⁇ .
  • the condenser microphone receives an acceleration a in the a direction
  • the bent portion 42 of the elastic holding member 4 is deformed by the impact of the back plate 5, and the distance between the back plate 5 and the amplifier device 11 will be Rapidly decreasing, however, when the distance between the two is equal to the vertical height of the auxiliary supporting member 43, the circuit board substrate 1 will be in contact with and supported by the auxiliary supporting member 43, thereby preventing the back plate 5 and the amplifier device 11 from colliding,
  • the deformation of the bent portion 42 of the elastic holding member 4 is prevented from being excessively large, resulting in a decrease in resilience performance, resulting in a hidden connection of the internal circuit of the product.
  • the auxiliary support portion may be a bump formed by punching on the elastic holding member, or a projection of a certain height may be formed by other design and manufacturing methods as long as the vertical height thereof is larger than the height of the amplifier device 11.
  • the pitch between the circuit board substrate 1 and the back plate 5 is smaller than when the microphone is not subjected to an impact.
  • the elastic retaining member in the second embodiment is an annular frame structure, it is preferable to design the auxiliary support members to be at least two and symmetrically distributed so as to be subjected to pressure and to ensure a balance of force for optimal support. effect.
  • bent portion 42 provides elastic electrical connection between the back plate 5 and the circuit board substrate 1, in order to ensure the quality of the electrical connection, a rounded convex portion is provided at the top end of the curved portion of the bent portion 42.
  • the bumps of the rounded protrusions are electrically connected to the back plate or the circuit board substrate.
  • the capacitor component can be electrically connected to the circuit board substrate 1 in various ways, such as the electrical connection mode, the auxiliary circuit, etc. in the first embodiment, and the electrical connection that can be adopted.
  • the method can be flexibly selected according to the actual needs of the product under the overall inventive idea of the present invention, and should not depart from the scope of protection of the present invention.
  • the external frame of the condenser microphone can be packaged and implemented in various ways, wherein the position of the circuit board, the setting of the sound hole, and the installation position of the amplifier and the capacitor component can be flexibly designed according to the needs of production, installation or use, nor This specific technical solution provided by this embodiment should be emphasized.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Description

说明书
Title of Invention:一种电容式传声器 技术领域
技术领域
[1] 本发明涉及电容式传声器技术领域。
背景技术
背景技术
[2] 随着手机、 笔记本、 助听器等电子产品对内部零件的尺寸要求越来越小, 大量 尺寸较小、 品质较好并且成本较低的微型电容式传声器被应用。 目前, 市场上 已经出现的微型电容式传声器体积一般在几十立方毫米的尺寸上, 在这种尺寸 下, 如果按照传统的微型电容式传声器设计方式, 基本结构为一个金属外壳和 一个线路板形成一个保护框, 内部安装有起到支撑、 绝缘作用的塑料腔体, 腔 体内部安装有金属栅环用于电路导通, 栅环连接电容组件, 因为其内部零件的 尺寸较大、 数量较多, 势必影响产品性能, 从技术角度而言, 产品的尺寸和性 能之间存在着矛盾关系。 所以, 已有专利 CN200710129770.6提出了一种新结构 电容式传声器, 包括一个线路板基板和一个框体形成保护结构, 保护结构上设 有声孔用于接受外界信号, 内部依次安装有振动膜、 隔离垫片和背极板, 背极 板通过一个弹簧材料构成的弹性保持部件和线路板基板之间保持弹性电连接, 振动膜可以通过框体内部的电路电连接到线路板基板。 这种产品结构一定程度 上可以减小产品尺寸, 然而在这种结构的背极板和框体的内侧壁之间存有一定 的间隙, 背极板可以在框体内自由移动, 其位置只能通过弹性保持部件的弹性 来保证。 在产品处于较稳定状态吋, 背极板可以通过弹性保持部件保持稳定, 并且能够和线路板基板之间保持较好的电连接。 在产品处于剧烈加速度状态时 , 例如跌落试验, 有可能出现多种缺陷: 背极板形成的较大冲击力完全作用到 弹性保持部件上, 导致弹性保持部件剧烈压缩过度变形, 导致回弹性能下降, 从而最终导致线路板基板和背极板之间的电连接不稳定, 甚至断路; 线路板基 板接近中心的位置由于安装有放大器装置, 也容易形成的较大冲击力导致线路 板基板安装放大器装置的位置发生超向背极板一侧的形变, 这种情况也容易导 致性保持部件的压缩变形, 最终可能导致背极板和放大器装置产生撞击, 从而 导致放大器装置破坏等不良后果。
所以, 需要设计一种可靠性更好的新结构电容式传声器, 能够将产品尺寸进一 步变薄、 小而不至于产生各种不良缺陷。
对发明的公幵
技术问题
[4] 本发明所要解决的技术问题是提供一种可靠性更好, 能够承受较大的加速度活 动或者撞击而不产生性能下降或者损坏的电容式传声器。
技术解决方案
[5] 为解决上述技术问题, 本发明提供一种电容式传声器, 包括线路板基板、 与 线路板基板固定连接的壳体, 以及设置于传声器内部的放大器装置、 弹性保持 部件和电容组件, 其中, 在线路板基板或壳体上设置有用于接受外界信号的声 孔; 所述弹性保持部件设置于放大器装置侧或者电容组件侧, 所述放大器装置 和所述电容组件均与所述线路板基板电连接, 其特征在于:
[6] 所述弹性保持部件上设置有辅助支撑部件 , 所述辅助支撑部件的垂直高度大于 所述放大器装置的高度, 小于所述电容组件和所相对的传声器内壁之间的间距
[7] 此外, 优选的结构是, 所述弹性保持部件还包括框架和弯折部; 所述电容组件 与所述线路板基板之间通过所述弯折部保持弹性电连接。
[8] 此外, 优选的结构是, 弹性保持部件包括一个相对于线路板基板平面平行的框 架及从框架端部延伸的弯折部; 辅助支撑部件设置在框架上。
[9] 另外, 弯折部的弹性端部为圆滑弯曲形状。
[10] 此外, 优选的结构是, 弹性保持部件为带有弯折曲面的环形薄片框架结构, 弯 折部为圆滑拱形弯曲, 辅助支撑部件为设置在所述框架上的凸起。
[11] 此外, 优选的结构是, 所述电容组件包括从传声器内表面上依次安装的金属环
、 振动膜片、 隔离垫片和背极板。
[12] 此外, 优选的结构是, 背极板通过弹性保持部件与所述线路板基板 (1 ) 之间 保持弹性电连接。
[13] 此外, 优选的结构是, 框架端部连接所述背极板, 弯折部顶部连接所述线路板 基板。
[14] 此外, 优选的结构是, 电容式传声器还包括设置于壳体侧壁内部的金属孔、 设 置于传声器内壁和金属环之间金属层, 所述金属孔和金属层、 金属环一起作用 电连通振动膜片和线路板基板。
[15] 优选的, 框架和所述弯折部的结合处为圆滑弧线弯曲; 在所述弯折部的圆滑拱 形弯曲的顶端设有圆滑凸起; 辅助支撑部件至少两个并且对称分布; 辅助支撑 部件为具有多个支撑脚的弧形凸起。
有益效果
[16] 采用上述方案后, 当电容式传声器承受较大的加速度活动或者撞击吋, 由于加 速度及惯性的作用, 电容式传声器的内部空间会受到挤压, 从而导致弹性保持 部件受到压缩。 当弹性保持部件被压缩到一定程度时, 辅助支撑部件就会支撑 在电容式传声器的电容组件和相对应的内壁之间, 从而使得传声器产品内部的 压力传递到辅助支撑部件上, 防止放大器装置和电容组件二者距离过近, 从而 悠闲地避免弹性保持部件形变过大所导致的放大器装置和背极板相互撞击; 并 且同时还能防止弹性保持部件形变过大所导致的回弹性的能减弱。
附图说明
[17] 通过下面结合附图对其实施例进行描述, 本发明的上述特征和技术优点将会变 得更加清楚和容易理解。
[18] 图 1是表示本发明第一实施例的结构示意图;
[19] 图 2是本发明第一实施例弹性保持部件的结构示意图;
[20] 图 3是本发明第一实施例产品受到加速度冲击吋的结构示意图;
[21] 图 4是本发明第二实施例的结构示意图;
[22] 图 5是本发明第二实施例弹性保持部件的结构示意图;
[23] 图 6是本发明第二实施例弹性保持部件的立体示意图;
[24] 图 7是本发明第二实施例产品受到加速度冲击吋的结构示意图。
本发明的实施方式 [25] 下面结合附图和具体实施例对本发明做进一步详细的描述。
[26] 第一实施例
[27] 图 1是表示本发明第一实施例的结构示意图。 如图 1所示, 第一实施例提供的 电容式传声器的外部形状和内侧结构都是方形的, 一个方框形的线路板框架 2 和一个方形的带有声孔 32的线路板底板 3组成壳体, 壳体和一个方形的安装有 放大器装置 11的线路板基板 1结合在一起构成近似三明治形状的保护结构。
[28] 保护结构内部安装有电容组件和弹性保持部件 4, 其中电容组件安装在传声器 内部设置有声孔的一侧, 并且与对面一侧的线路板基板 1电连接, 弹性保持部 件 4安装在安装有放大器装置 11的一侧。
[29] 如图 1所示, 电容组件由上而下包括背极板 5、 隔离膜片 7、 振动膜 61和用 于固定振动膜 61的金属环 6。 其中隔离膜片 Ί置于背极板 5以及膜片 61之间 , 从而形成平行板电容。 其中, 背极板 5和振动膜 6分别与线路板基板电连接
[30] 图 2是本实施例弹性保持部件的结构示意图, 如图 2所示, 弹性保持部件 4 包括一个框架 41和一个弯折部 42, 框架 41被安装在线路板基板 1上, 并环绕 放大器装置 11, 弯折部 42弹性接触在背极板 5上, 并且框架 41上一体设计有 两个对称分布的辅助支撑部件 43, 辅助支撑部件 43和框架 41的平面垂直, 呈 柱状, 位于放大器装置 11的侧部, 其垂直高度大于放大器装置 11的高度, 小 于传声器未受到冲击吋线路板基板 1和背极板 5之间的间距。
[31] 在弹性保持部件 4安装到电容式传声器中以后, 辅助支撑部件 43的下端没有 接触背极板 5, 但相对放大器装置 11更为接近背极板 5, 从而在电容式传声器 受到如图 3所示 a方向的加速度吋, 弹性保持部件 4的弯折部 42将受到背极板 5的冲击发生形变, 背极板 5和放大器装置 11之间的间距将迅速减小, 然而当 二者间距等于辅助支撑部件 43的垂直高度时, 背极板 5将和辅助支撑部件 43 接触并且受到支撑, 从而避免了背极板 5和放大器装置 11产生撞击, 并且避免 弹性保持部件 4的弯折部 42形变过大, 造成回弹性能下降, 造成产品的内部电 路连接隐患。
[32] 本发明中的电容组件可以通过多种方式和线路板基板 1实现电连接。 在本实施 例中, 在线路板框架 2内部设置有可以导电的金属孔, 并且传声器内壁和金属 环 6之间设置一延伸至金属孔的金属层 31, 使金属孔和线路板底板 3上的金属 层 31、 金属环 6—起作用电连通振动膜 61和线路板基板 1。 即膜片 61通过金 属环 6、 线路板底板 3上的金属层 31以及设置在线路板框架 2内部的金属孔 21 电连通到线路板基板 1上的电路 12上。 而背极板 5则可以通过设置在传声器内 部的金属弹性保持部件 4的弯折部 42电连通到线路板基板 1上。
[33] 在本实施方式中, 线路板框架 2内部设置的金属孔可以通过在线路板基材上钻 孔的工艺形成。
[34] 在本实施例中, 弹性保持部件 4包括一个相对于线路板基板平面平行的框架 41和从所述框架一侧垂直于框架平面延伸出的弯折部 42 , 所述辅助支撑部件 43垂直设置在所述框架 41上, 可以保证辅助支撑部件 43具有较为稳定的支撑 , 能够更好的起到支撑的作用; 框架 41与线路板基板 1连接, 弯折部 42连接 所述背极板 5, 结构及电路连接更为稳定。
[35] 但也可以将框架 41连接至背极板 5, 弯折部 42连接线路板基板 1, 这种连接 方式可以将弹性保持部件 4和线路板基板 1之间的平行面积减小, 能够起到降 低寄生电容的作用。
[36] 另外, 由于弯折部 42为背极板 5和线路板基板 1提供弹性电连接, 为了保障 电连接的质量, 将弯折部 42的弹性端部设计为有圆滑弯曲形状的端部, 利用该 端部的圆滑弯曲状凸起的凸点与背极板或者线路板基板实现电连接。
[37] 弹性保持部件 4具体如何安装, 可以根据实际产品的需要来灵活设计。 辅助支 撑部件 43采用柱状支撑物 , 和弹性保持部件 4为一体结构 , 并且辅助支撑部件 43可以设计为一个, 以简化生产工艺、 降低生产成本; 也可以釆用多个对称分 布的设计, 可以起到结构稳定、 支撑效果好的优点。
[38] 另外, 还需要说明的是, 在本实施例一中, 电容式传声器的外部框架包括由线 路板框架 2和线路板底板 3组成的壳体和线路板基板 1, 但本领域技术人员都 明白, 电容式传声器的外部框架有多种封装、 实现方式, 其中线路板的位置、 声孔的设置以及放大器和电容组件的安装位置都可以根据生产、 安装或者使用 的需要而灵活设计, 因此本实施例一所提供的电容式传声器的实现还有其他多 种方式, 不应拘泥于本实施例所提供的这一具体技术方案。
[39] 第二实施例
[40] 图 4、 图 5和图 6分别是本发明第二实施例的整体和部分构件的结构示意图。
如图 4、 图 5和图 6所示, 本第二实施例和第一实施例的区别在于弹性保持部 件 4的安装位置和设计结构不同。
[41] 与第一实施例中的将弹性保持部件 4框架 41安装在放大器装置 11一侧不同, 在本第二是实施例中, 弹性保持部件 4的框架 41安装在电容组件的背极板 5上 , 在传声器受到冲击使弹性保持部件发生形变吋, 辅助支撑部件 43同样在形变 极限处支撑在背极板和设置有放大器装置的传声器内壁之间。 弹性保持装置安 装位置不同所产生的结果在于与辅助支撑部件顶点接触的位置不同, 在第一实 施例中, 与辅助支撑部件顶点接触的位置在背极板 5上, 而在本第二实施例中 , 与辅助支撑部件顶点接触的位置在作为传声器内壁的设置有放大器装置的线 路板基板 1上。 另外, 这种安装方式可以减小弹性保持部件 4和线路板基板 1 之间的平行面积, 起到较好的降低寄生电容的作用。
[42] 此外, 在本实施例中, 弹性保持部件 4为一个弯折成曲面的环形薄片框架结构 , 图 5和图 6分别是本第二实施例弹性保持部件的结构示意图和立体示意图。
[43] 如图 5和图 6所示, 弹性保持部件 4包括一个基本为平面的框架 41、 弯折部 42、 连接框架 41和弯折部 42的结合部 44 , 以及辅助支撑部 43。 其中框架 41 、 弯折部 42和结合部 44共同构成一个具体一定高度的拱形曲面 (如图 5所示 并且框架 41、 弯折部 42和结合部 44所构成的环形框架结构的中空区域略 大于放大器装置 11的横截面, 使其环形结构可以围绕在放大器装置 11的周围
[44] 辅助支撑部 43为具有多个支撑脚的弧形凸起, 一体设置在弹性保持部件 4的 框架 41上, 辅助支撑部 43的垂直高度大于放大器装置 11的高度, 小于传声器 未受到冲击吋线路板基板 1和背极板 5之间的间距。
[45] 第二实施例中这种环形框架结构的弹性保持部件 4围绕在放大器装置 11周围 , 可以充分利用电容式传声器的内部空间, 使得电容式传声器产品的尺寸进一 步变薄, 并且这种曲面的环形薄片框架结构的弹性保持部件稳定性强、 弹性性 能好, 更加适合小尺寸的产品应用。
[46] 另外, 框架 41和弯折部 42的结合部 44为圆滑弧线弯曲, 可以保证更好的弹 性效果; 辅助支撑部件 43为具有多个支撑脚的弧形凸起, 结构稳定。 较之于第 一实施例中的弹性保持部件, 本实施例中的弹性保持部件可以采用冲压等工艺 一体制作, 工艺步骤更加简单, 相应也会降低生产成本。
[47] 图 7表示了本实施例产品受到加速度冲击吋的结构示意图。 如图 7所示, 在电 容式传声器受到 a方向的加速度吋, 弹性保持部件 4的弯折部 42将受到背极板 5的冲击发生形变, 背极板 5和放大器装置 11之间的间距将迅速减小, 然而当 二者间距等于辅助支撑部件 43的垂直高度时, 线路板基板 1将和辅助支撑部件 43接触并且受到支撑, 从而避免了背极板 5和放大器装置 11产生撞击, 同吋避 免弹性保持部件 4的弯折部 42形变过大, 造成回弹性能下降, 造成产品的内部 电路连接隐患。
[48] 在本发明中, 辅助支撑部也可以是在弹性保持部件上冲压形成的凸点, 或者采 用其他的设计制造方法形成一定高度的凸起, 只要使其垂直高度大于放大器装 置 11的高度、 小于传声器未受到冲击时线路板基板 1和背极板 5之间的间距就 能够起到相同的效果。 另外, 由于本第二实施例中的弹性保持部件是环形框架 结构, 因此, 最好将辅助支撑部件设计为至少两个并且对称分布, 以便在承受 压力吋保证受力平衡, 实现最佳的支撑效果。
[49] 另外, 由于弯折部 42为背极板 5和线路板基板 1提供弹性电连接, 为了保障 电连接的质量, 在弯折部 42的圆滑拱形弯曲的顶端设有圆滑凸起, 利用该圆滑 凸起的凸点与背极板或者线路板基板实现电连接。
[50] 同样, 在本第二实施例中, 电容组件也可以通过多种方式和线路板基板 1实现 电连接, 比如第一实施例中的电连接方式、 辅助电路等, 能够采用的电连接方 法可以在本发明的整体发明思想下根据产品的实际需要灵活选用, 都不应当脱 离本发明的保护范围。 并且, 电容式传声器的外部框架有多种封装、 实现方式 , 其中线路板的位置、 声孔的设置以及放大器和电容组件的安装位置都可以根 据生产、 安装或者使用的需要而灵活设计, 也不应拘泥于本实施例所提供的这 一具体技术方案。 [51] 在本发明的上述教导下, 本领域技术人员可以在上述实施例的基础上进行各 种改进和变形, 而这些改进和变形, 都落在本发明的保护范围内, 本领域技术 人员应该明白, 上述的具体描述只是更好的解释本发明的目的, 本发明的保护 范围由权利要求及其等同物限定。
工业实用性
[52]
序列表自由内容
[53]

Claims

权利要求书
[Claim 1] 1、 一种电容式传声器, 包括线路板基板 ( 1 ) 、 与所述线路板 基板固定连接的壳体, 以及设置于传声器内部的放大器装置 (11 ) 、 弹性保持部件 (4) 和电容组件,
其中, 在所述线路板基板 (1) 或所述壳体上设置有用于接受外 界信号的声孔 (32) ;
所述弹性保持部件 (4) 设置于放大器装置 (11 ) 侧或者电容组 件侧, 所述放大器装置 (11 ) 和所述电容组件均与所述线路板基 板电连接;
在所述弹性保持部件 (4) 上设置有辅助支撑部件 (43) , 所述 辅助支撑部件 (43) 的垂直高度大于所述放大器装置的高度, 小 于所述电容组件和所相对的传声器内壁之间的间距。
2、 按照权利要求 1所述的电容式传声器, 其特征在于, 所述弹性保持部件 (4) 还包括框架 (41 ) 和弯折部 (42) ; 所述电容组件与所述线路板基板 (1 ) 之间通过所述弯折部 (42 ) 保持弹性电连接。
3、 按照权利要求 1所述的电容式传声器, 其特征在于, 所述弹性保持部件 (4) 包括一个相对于所述线路板基板 (1 ) 平面平行的框架 (41) 及从所述框架端部延伸的弯折部 (42) 所述辅助支撑部件 (43) 设置在所述框架 (41 ) 上。
4、 按照权利要求 2或 3所述的电容式传声器 , 其特征在于, 所述弯折部 (42) 的弹性端部为圆滑弯曲形状。
5、 按照权利要求 2所述的电容式传声器, 其特征在于, 所述弹性保持部件 (4) 为带有弯折曲面的环形薄片框架结构, 所述弯折部 (42) 为圆滑拱形弯曲, 所述辅助支撑部件 (43) 为设置在所述框架 (41 ) 上的凸起。
6、 按照权利要求 1或 2或 3所述的电容式传声器, 其特征在于 所述电容组件包括从传声器内表面上依次安装的金属环 (6) 、 振动膜片 (61 ) 、 隔离垫片 (7) 和背极板 (5) 。
7、 按照权利要求 6所述的电容式传声器, 其特征在于, 所述背极板 (5) 通过弹性保持部件 (4) 与所述线路板基板 (1 ) 之间保持弹性电连接。
8、 按照权利要求 7所述的电容式传声器, 其特征在于, 所述框架 (41 ) 端部连接所述背极板, 所述弯折部 (42) 顶部 连接所述线路板基板。
9、 按照权利要求 6所述的电容式传声器, 其特征在于, 还包括设置于壳体侧壁内部的金属孔、 设置于传声器内壁和金属 环 (6) 之间金属层 (31) , 所述金属孔和金属层 (31 ) 、 金 属环 (6) —起作用电连通振动膜片 (61 ) 和线路板基板 (1 )
10、 按照权利要求 5所述的电容式传声器, 其特征在于, 所述框架 (41 ) 和所述弯折部 (42) 的结合处为圆滑弧线弯曲
11、 按照权利要求 5所述的电容式传声器, 其特征在于, 在所述弯折部 (42) 的圆滑拱形弯曲的顶端设有圆滑凸起。
12、 按照权利要求 5所述的电容式传声器, 其特征在于, 所述辅助支撑部件 (43) 至少两个并且对称分布。
13、 按照权利要求 5所述的电容式传声器, 其特征在于, 所述辅助支撑部件 (43) 为具有多个支撑脚的弧形凸起。
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CN201323651Y (zh) 2009-10-07
KR20100108434A (ko) 2010-10-06
US8693712B2 (en) 2014-04-08

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