WO2022000645A1 - 麦克风 - Google Patents

麦克风 Download PDF

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Publication number
WO2022000645A1
WO2022000645A1 PCT/CN2020/104630 CN2020104630W WO2022000645A1 WO 2022000645 A1 WO2022000645 A1 WO 2022000645A1 CN 2020104630 W CN2020104630 W CN 2020104630W WO 2022000645 A1 WO2022000645 A1 WO 2022000645A1
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WIPO (PCT)
Prior art keywords
circuit board
microphone
shielding
metal shell
protective structure
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PCT/CN2020/104630
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English (en)
French (fr)
Inventor
胡恒宾
曾鹏
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瑞声声学科技(深圳)有限公司
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Publication of WO2022000645A1 publication Critical patent/WO2022000645A1/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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields

Definitions

  • the present invention relates to the field of acoustics and electricity, in particular to a microphone.
  • the microphone in the related art includes a circuit board, a casing that is covered with the circuit board to form an accommodation space, and an ASIC chip and a MEMS chip accommodated in the accommodation space, wherein the ASIC chip and the MEMS chip are fixed on the circuit board, and the casing is made of metal shell.
  • the microphone in the related art only has an electromagnetic shielding structure with a single metal shell, which makes the ASIC chip susceptible to electromagnetic interference, which seriously affects the performance of the MEMS microphone.
  • the purpose of the present invention is to provide a microphone, which can greatly improve the problem of electromagnetic interference suffered by the microphone.
  • the present application provides a microphone, including a protection structure with a receiving space, and an ASIC chip and a MEMS chip accommodated in the protection structure, the protection structure is provided with a sound hole, and the protection structure includes a circuit board and a connection with the protection structure.
  • the circuit board is covered with a casing forming the accommodating space, a shielding cover made of metal is also fixed in the protective structure, and the protective structure and the shielding cover are enclosed to form a shielding space for accommodating the ASIC chip.
  • the casing is made of metal material.
  • the outer shell and/or the shielding case includes a first metal shell, a second metal shell arranged at intervals, and an electromagnetic shielding film arranged between the first metal shell and the second metal shell.
  • the MEMS chip divides the receiving space into a first acoustic cavity and a second acoustic cavity, and the acoustic hole communicates with the first acoustic cavity or the second acoustic cavity.
  • the ASIC chip is fixed on the circuit board, and the circuit board and the shielding case are enclosed to form the shielding space.
  • the shielding case is spaced apart from the outer casing.
  • the ASIC chip is electrically connected to the circuit board through a first wire
  • the MEMS chip is electrically connected to the circuit board through a second wire
  • the first wire and the second wire are embedded in the circuit board.
  • the circuit in the circuit board is electrically connected.
  • the microphone of the present invention is provided with a shielding cover that is enclosed with the protective structure to form an independent shielding space, and the ASIC chip is located in the shielding space, so that the noise outside the shielding space can be improved. Electromagnetic interference of electromagnetic waves to the ASIC chip.
  • FIG. 1 is a schematic three-dimensional structure diagram of an embodiment of a microphone of the present invention.
  • FIG. 2 is an exploded view of the microphone shown in FIG. 1 .
  • FIG. 3 is a cross-sectional view of the microphone shown in FIG. 1 .
  • FIG. 4 is a cross-sectional view of another embodiment of the microphone of the present invention.
  • FIG. 5 is a cross-sectional view of yet another embodiment of the microphone of the present invention.
  • the microphone includes a protective structure 1 having a receiving space 1A, an ASIC chip 3 and a MEMS chip 5 housed in the protective structure 1 , and the MEMS chip 5 divides the receiving space 1A into a first acoustic cavity 1B and the second acoustic cavity 1C, the protective structure 1 is provided with an acoustic hole 7 which communicates with the first acoustic cavity 1B or the second acoustic cavity 1C.
  • the first acoustic cavity 1B is the back cavity of the MEMS chip 5 .
  • the protection structure 1 includes a circuit board 11 and a casing 13 covering the circuit board 11 to form the accommodating space 1A.
  • an external sound wave acts on the MEMS chip 5 through the sound hole 7 , the MEMS The chip 5 generates electrical signals, and the electrical signals generated by the MEMS chip 5 are output to external circuits through the ASIC chip 3 and the circuit board 11 .
  • the casing 13 is a metal casing, for example, a copper casing; the casing 13 and the circuit board 11 are connected by welding, and the connection between the casing 13 and the circuit board 11 may be electrical Electrical connection (for example, the housing 13 and the circuit board 11 can be electrically connected by means of conductive material connection, laser welding, etc.), or non-electrical connection (for example, the housing 13 and the The circuit boards 11 are connected by non-conductive materials).
  • the casing 13 By setting the casing 13 as a metal casing, the casing 1 can have a shielding effect, thereby further reducing the electromagnetic interference of the ASIC chip.
  • a shielding cover 9 is also fixed in the protection structure 1 , and the protection structure 1 and the shielding cover 9 are enclosed to form a shielding space 10 for accommodating the ASIC chip 3 .
  • a shielding cover 9 enclosing the protective structure 1 to form an independent shielding space 10, and placing the ASIC chip 3 in the shielding space 10, electromagnetic waves outside the shielding space 10 are shielded from the ASIC.
  • the shielding cover 9 is a metal mesh cover made of a metal material, or a metal shell made of a metal material.
  • the shielding cover 9 is a metal shell made of a metal material.
  • the housing 13 may be made of metallic material.
  • the protective structure 1 and the shielding cover 9 are connected by welding.
  • the ASIC chip 3 is fixed on the circuit board 11 , and the circuit board 11 and the shielding cover 9 are enclosed to form the shielding space 10 .
  • the connection between the shielding cover 9 and the circuit board 11 may be an electrical connection (for example, the shielding cover 9 and the circuit board 11 may be electrically connected by conductive material connection, laser welding, etc. ), or a non-electrical connection (for example, the shielding case 9 and the circuit board 11 are connected through a non-conductive material).
  • the shielding cover 9 and the outer casing 13 are spaced apart.
  • the ASIC chip 3 is electrically connected to the circuit board 11 through a first wire a
  • the MEMS chip 5 is electrically connected to the circuit board 11 through a second wire b
  • the first wire a It is electrically connected with the second wire b through the circuit embedded in the circuit board 11 .
  • the first wire may not be provided
  • the ASIC chip 3 is directly electrically connected to the second wire b through a circuit embedded in the circuit board 11 .
  • the MEMS chip 5 is fixed on the circuit board 11 and is enclosed with the circuit board 11 to form the first acoustic cavity 1B, and the acoustic hole 7 penetrates through the circuit board 11 to communicate with the circuit board 11 .
  • the first acoustic cavity 1B is communicated.
  • the difference between the second embodiment and the first embodiment is only that the acoustic hole 7 penetrates through the casing 13 to communicate with the second acoustic cavity 1C.
  • the housing 13 includes a first metal shell 131 , a second metal shell 132 , and a first metal shell 131 and a second metal shell 132 arranged at intervals.
  • the shielding cover 9 may also include a first metal shell, a second metal shell and an electromagnetic shielding film disposed between the first metal shell and the second metal shell.
  • the ASIC chip may also be fixed on the casing, and the casing and the shielding case enclose the shielding space to form the shielding space; or, the MEMS chip may be fixed on the casing
  • the first acoustic cavity is formed on and enclosed with the outer casing.
  • the acoustic hole runs through the casing to communicate with the first acoustic cavity, or the acoustic hole passes through the line to communicate with the first acoustic cavity.
  • the second acoustic cavity is connected.
  • the microphone of the present invention is provided with a shielding cover 9 that is enclosed with the protection structure 1 to form an independent shielding space 10, and the ASIC chip 3 is located in the shielding space 10, thereby improving the overall performance of the microphone.
  • the electromagnetic interference of the electromagnetic wave outside the shielding space 10 to the ASIC chip 3 is avoided.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Micromachines (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

本发明提供了一种麦克风，包括具有收容空间的保护结构以及收容于所述保护结构内的ASIC芯片和MEMS芯片，所述保护结构上贯穿设有声孔，所述保护结构包括线路板及与所述线路板盖接形成所述收容空间的外壳，所述保护结构内还固设有由金属制成的屏蔽罩，所述保护结构与所述屏蔽罩围合形成收容所述ASIC芯片的屏蔽空间。与相关技术相比，本发明的麦克风可以较大程度上改善麦克风受到的电磁干扰问题。

Description

麦克风 技术领域
本发明涉及声电领域，尤其涉及一种麦克风。
 背景技术
随着无线通讯的发展，全球移动电话用户越来越多，用户对移动电话的要求己不仅满足于通话，而且要能够提供高质量的通话效果，尤其是目前移动多媒体技术的发展，移动电话的通话质量更显重要，移动电话的麦克风作为移动电话的语音拾取装置，其设计好坏直接影响通话质量。
相关技术中的麦克风，包括线路板、与线路板盖接形成收容空间的外壳以及收容于收容空间内的ASIC芯片和MEMS芯片，其中，ASIC芯片和MEMS芯片固设于线路板上，外壳为金属外壳。然而相关技术中的麦克风只有单个金属外壳的电磁屏蔽结构，使得ASIC芯片易受到电磁干扰，从而严重影响微机电麦克风的性能。
因此，实有必要提供一种新的麦克风解决上述技术问题。
 技术问题
本发明的目的在于提供一种麦克风，该麦克风可以较大程度上改善麦克风受到的电磁干扰的问题。
 技术解决方案
本申请提供一种麦克风，包括具有收容空间的保护结构以及收容于所述保护结构内的ASIC芯片和MEMS芯片，所述保护结构上贯穿设有声孔，所述保护结构包括线路板及与所述线路板盖接形成所述收容空间的外壳，所述保护结构内还固设有由金属制成的屏蔽罩，所述保护结构与所述屏蔽罩围合形成收容所述ASIC芯片的屏蔽空间。
优选地，所述外壳由金属材质制成。
优选地，所述外壳和/或所述屏蔽罩包括间隔设置的第一金属壳、第二金属壳以及设置在所述第一金属壳与所述第二金属壳之间的电磁屏蔽膜。
优选地，所述 MEMS芯片将所述收容空间分隔为第一声腔和第二声腔，所述声孔与所述第一声腔或所述第二声腔连通。
优选地，所述ASIC芯片固定于所述线路板上，所述线路板与所述屏蔽罩围合形成所述屏蔽空间。
优选地，所述屏蔽罩与所述外壳间隔设置。
优选地，所述ASIC芯片通过第一导线与所述线路板电连接，所述MEMS芯片通过第二导线与所述线路板电连接，所述第一导线和所述第二导线通过嵌在所述线路板内的电路电连接。
 有益效果
与相关技术相比，本发明的麦克风通过设置与所述保护结构围合形成独立的屏蔽空间的屏蔽罩，并使得所述ASIC芯片位于所述屏蔽空间内，从而可以改善所述屏蔽空间外的电磁波对所述ASIC芯片的电磁干扰。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中。
图1为本发明的麦克风一实施例的立体结构示意图。
图2为图1所示的麦克风的爆炸图。
图3为图1所示的麦克风的剖视图。
图4为本发明的麦克风另一实施例的剖视图。
图5为本发明的麦克风又一实施例的剖视图。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
实施例一
请参阅图1，麦克风包括具有收容空间1A的保护结构1以及收容于所述保护结构1内的ASIC芯片3和MEMS芯片5，所述MEMS芯片5将所述收容空间1A分隔为第一声腔1B和第二声腔1C，所述保护结构1上贯穿设有与所述第一声腔1B或所述第二声腔1C连通的声孔7。所述第一声腔1B为所述MEMS芯片5的背腔。
所述保护结构1包括线路板11及与所述线路板11盖接形成所述收容空间1A的外壳13，当外界声波经过所述声孔7作用在所述MEMS芯片5上时，所述MEMS芯片5产生电信号，所述MEMS芯片5产生的电信号经所述ASIC芯片3和所述线路板11输出至外部电路。
其中，所述外壳13为金属外壳，例如，铜制外壳；所述外壳13与所述线路板11之间通过焊接连接，且所述外壳13与所述线路板11之间的连接可以为电性连接（例如，通过所述外壳13与所述线路板11之间可以通过导电材料连接、激光焊接等方式电性连接），也可以为非电性连接（例如，所述外壳13与所述线路板11之间通过非导电材料连接）。通过将所述外壳13设置为金属外壳，从而可以使得所述外壳1具有屏蔽作用，从而可以进一步降低所述ASIC芯片的电磁干扰。
所述保护结构1内还固设有屏蔽罩9，所述保护结构1与所述屏蔽罩9围合形成收容所述ASIC芯片3的屏蔽空间10。通过设置与所述保护结构1围合形成独立的屏蔽空间10的屏蔽罩9，并使得所述ASIC芯片3位于所述屏蔽空间10内，从而屏蔽所述屏蔽空间10外的电磁波对所述ASIC芯片3的电磁干扰。
其中，所述屏蔽罩9由金属材料制成的金属网罩，或者，金属材料制成的金属壳。在本实施例中，所述屏蔽罩9为金属材料制成的金属壳。所述外壳13可以由金属材料制成。
所述保护结构1与所述屏蔽罩9之间通过焊接连接。
在本实施例中，所述ASIC芯片3固定于所述线路板11上，所述线路板11与所述屏蔽罩9围合形成所述屏蔽空间10。
所述屏蔽罩9与所述线路板11之间的连接可以为电性连接（例如，通过所述屏蔽罩9与所述线路板11之间可以通过导电材料连接、激光焊接等方式电性连接），也可以为非电性连接（例如，所述屏蔽罩9与所述线路板11之间通过非导电材料连接）。
在本实施例中，所述屏蔽罩9与所述外壳13间隔设置。
在本实施例中，所述ASIC芯片3通过第一导线a与所述线路板11电连接，所述MEMS芯片5通过第二导线b与所述线路板11电连接，所述第一导线a和所述第二导线b通过嵌在所述线路板11内的电路电连接。可以理解的是，在其他实施例中，还可以不设置所述第一导线，所述ASIC芯片3直接通过嵌在所述线路板11内的电路与所述第二导线b电连接。
在本实施例中，所述MEMS芯片5固定于所述线路板11上并与所述线路板11围合形成所述第一声腔1B，所述声孔7贯穿所述线路板11以与所述第一声腔1B连通。
实施例二
请参阅图2，实施例二与实施例一的区别仅在于：所述声孔7贯穿所述外壳13以与所述第二声腔1C连通。
实施例三
请参阅图3，实施例三与实施例一的区别在于：在本实施例中，所述外壳13包括间隔设置的第一金属壳131、第二金属壳132以及设置在第一金属壳131与第二金属壳132之间的电磁屏蔽膜133。可以理解的是，所述屏蔽罩9也可以包括间隔设置的第一金属壳、第二金属壳以及设置在第一金属壳与第二金属壳之间的电磁屏蔽膜。通过将所述外壳13或/和所述屏蔽罩9设置成包括间隔设置的第一金属壳、第二金属壳以及设置在第一金属壳与第二金属壳之间的电磁屏蔽膜，可以使得所述外壳13或/和所述屏蔽罩9形成两层金属反射界面及板间滤波电容，从而可以有效屏蔽和滤除电磁波辐射的干扰。
可以理解的是，在其他实施例中，所述ASIC芯片也可以固定于所述外壳上，所述外壳与所述屏蔽罩围合形成所述屏蔽空间；或者，所述MEMS芯片固定于所述外壳上并与所述外壳围合形成所述第一声腔，相应地，所述声孔贯穿所述外壳以与所述第一声腔连通，或者，所述声孔贯穿所述线路以与所述第二声腔连通。
与相关技术相比，本发明的麦克风通过设置与所述保护结构1围合形成独立的屏蔽空间10的屏蔽罩9，并使得所述ASIC芯片3位于所述屏蔽空间10内，从而可以改善所述屏蔽空间10外的电磁波对所述ASIC芯片3的电磁干扰。
以上所述的仅是本发明的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出改进，但这些均属于本发明的保护范围。

Claims (7)

  1. 一种麦克风，包括具有收容空间的保护结构以及收容于所述保护结构内的ASIC芯片和MEMS芯片，所述保护结构上贯穿设有声孔，所述保护结构包括线路板及与所述线路板盖接形成所述收容空间的外壳，其特征在于，所述保护结构内还固设有由金属制成的屏蔽罩，所述保护结构与所述屏蔽罩围合形成收容所述ASIC芯片的屏蔽空间。
  2. 根据权利要求1所述的麦克风，其特征在于，所述外壳由金属材质制成。
  3. 根据权利要求1所述的麦克风，其特征在于，所述外壳和/或所述屏蔽罩包括间隔设置的第一金属壳、第二金属壳以及设置在所述第一金属壳与所述第二金属壳之间的电磁屏蔽膜。
  4. 根据权利要求1所述的麦克风，其特征在于，所述 MEMS芯片将所述收容空间分隔为第一声腔和第二声腔，所述声孔与所述第一声腔或所述第二声腔连通。
  5. 根据权利要求1-4中任一项所述的麦克风，其特征在于，所述ASIC芯片固定于所述线路板上，所述线路板与所述屏蔽罩围合形成所述屏蔽空间。
  6. 根据权利要求5所述的麦克风，其特征在于，所述屏蔽罩与所述外壳间隔设置。
  7. 根据权利要求5所述的麦克风，其特征在于，所述ASIC芯片通过第一导线与所述线路板电连接，所述MEMS芯片通过第二导线与所述线路板电连接，所述第一导线和所述第二导线通过嵌在所述线路板内的电路电连接。
PCT/CN2020/104630 2020-06-30 2020-07-24 麦克风 WO2022000645A1 (zh)

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CN202021264649.1U CN212572884U (zh) 2020-06-30 2020-06-30 麦克风

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