MEMS microphone with high electromagnetic shielding effect

Abstract

The utility model discloses an MEMS microphone with a high electromagnetic shielding effect, relates to the technical field of MEMS microphones, and aims to solve the problems that an existing MEMS microphone is lack of an electromagnetic shielding structure inside, is insufficient in anti-electromagnetic interference and needs to be improved in overall practicability. A first aluminum foil is pasted on the inner wall of the shell, a rear cover plate is installed at a port of the shell in a buckled mode, a second aluminum foil is pasted on the inner wall of the rear cover plate, a mounting hole is formed in the middle of the outer surface of one side of the shell, and a metal net is installed in the mounting hole in a buckled mode. A metal net is arranged in the shell, a connecting ring is installed on the inner end face of the shell in a buckled mode, the connecting ring is located on one side of the metal net, the connecting ring and the round metal net share the same central axis, a metal vibration film is arranged in the connecting ring, and a circuit board is installed in the shell in a buckled mode. Effective electromagnetic shielding can be achieved, and the overall anti-electromagnetic interference effect is high.

Description

Technical Field

[0001] The utility model relates to the technical field of MEMS microphones, and in particular to a MEMS microphone with high electromagnetic shielding effect. Background Art

[0002] As a type of microphone, MEMS microphones have very stable performance at different temperatures. Their sensitivity is not affected by temperature, vibration, humidity and time. Since the sensitivity changes very little before and after assembly, it can save audio debugging costs in the manufacturing process. Their superior performance is highly favored by manufacturers.

[0003] Existing MEMS microphones lack an internal electromagnetic shielding structure, are inadequate in resisting electromagnetic interference, and their overall practicality needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide a MEMS microphone with high electromagnetic shielding effect, which can effectively perform electromagnetic shielding and has strong overall anti-electromagnetic interference.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A MEMS microphone with high electromagnetic shielding effect includes a shell, a first aluminum foil adhered to the inner wall of the shell, a rear cover plate snap-fitted to the port of the shell, a second aluminum foil adhered to the inner wall of the rear cover plate, a mounting hole is provided at a middle position on the outer surface of one side of the shell, and a metal mesh is snap-fitted inside the mounting hole.

[0007] By adopting the above technical solution, the internal electronic components of the microphone can be wrapped with the first aluminum foil and the second aluminum foil, thereby performing electromagnetic shielding operation.

[0008] Furthermore, a connecting ring is snap-fitted on the inner end surface of the shell, and the connecting ring is located on one side of the metal mesh, and the connecting ring and the circular metal mesh have a common central axis.

[0009] By adopting the above technical solution, it is ensured that the subsequent structure can effectively block the sound hole.

[0010] Furthermore, a metal vibration membrane is provided inside the connecting ring.

[0011] By adopting the above technical solution, the propagation of sound is ensured and the electromagnetic shielding effect can be further improved.

[0012] Furthermore, a circuit board is mounted on the inner clip of the housing, and an ASIC module and a MEMS chip are arranged on the outer surface of the circuit board.

[0013] By adopting the above technical solution, it can be effectively ensured that the microphone can work stably.

[0014] Furthermore, a mounting hole is provided on the outer surface of the rear cover plate, and an electrical connector is snap-fitted inside the mounting hole, and the electrical connector is electrically connected to the circuit board.

[0015] By adopting the above technical solution, the convenience of electrical connection is effectively improved.

[0016] Furthermore, the ASIC module and the MEMS chip are electrically connected via a plurality of gold wires.

[0017] By adopting the above technical solution, stable transmission of current is ensured.

[0018] In summary, the beneficial technical effects of the present invention are:

[0019] 1. The present invention adheres a first aluminum foil to the inner wall of the housing and a second aluminum foil to the inner wall of the rear cover. The first and second aluminum foils can be used to wrap the electrical components of the microphone, thereby improving the electromagnetic shielding performance of the entire microphone and effectively improving the working stability of the microphone.

[0020] 2. The utility model installs a connecting ring and a metal vibration membrane on the inner end face of the shell. The metal vibration membrane is located on one side of the metal mesh, thereby effectively ensuring that the internal space of the shell is in a sealed state, while also ensuring the effective propagation of external sound. The working stability is further improved. The setting of the electrical connector can effectively improve the connection convenience between the microphone and the external circuit, and the practicality is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a first perspective view of the three-dimensional structure of the utility model;

[0022] Figure 2 This is a second viewing angle diagram of the three-dimensional structure of the present invention.

[0023] In the figure: 1. Shell; 2. Metal mesh; 3. Connecting ring; 4. Metal vibration membrane; 5. First aluminum foil; 6. Circuit board; 7. ASIC module; 8. MEMS chip; 9. Second aluminum foil; 10. Back cover; 11. Electrical connector. DETAILED DESCRIPTION

[0024] The method of the utility model is further described in detail below with reference to the accompanying drawings.

[0025] Reference Figure 1 、 Figure 2A MEMS microphone with high electromagnetic shielding effect includes a shell 1, a first aluminum foil 5 is pasted on the inner wall of the shell 1, a back cover 10 is snap-fitted to the port of the shell 1, a second aluminum foil 9 is pasted on the inner wall of the back cover 10, a mounting hole is provided at a middle position on the outer surface of one side of the shell 1, and a metal mesh 2 is snap-fitted inside the mounting hole, wherein by pasting the first aluminum foil 5 on the inner wall of the shell 1 and pasting the second aluminum foil 9 on the inner wall of the back cover 10, the first aluminum foil 5 and the second aluminum foil 9 can be used to wrap the electrical components of the microphone, thereby improving the electromagnetic shielding performance of the entire microphone, and the working stability of the microphone is effectively improved.

[0026] Reference Figure 1 , a connecting ring 3 is snap-fitted on the inner end face of the shell 1, the connecting ring 3 is located on one side of the metal mesh 2, and the connecting ring 3 and the circular metal mesh 2 have the same central axis, a metal vibration membrane 4 is arranged inside the connecting ring 3, and a mounting hole is provided on the outer surface of the back cover 10, and an electrical connector 11 is snap-fitted inside the mounting hole, and the electrical connector 11 is electrically connected to the circuit board 6, wherein by installing the connecting ring 3 and the metal vibration membrane 4 on the inner end face of the shell 1, the metal vibration membrane 4 is located on one side of the metal mesh 2, so that the internal space of the shell 1 can be effectively ensured to be in a sealed state, and at the same time, the effective propagation of external sound can be ensured, the working stability is further improved, and the setting of the electrical connector 11 can effectively improve the convenience of connecting the microphone with the external circuit, and the practicality is effectively improved, and a snap-fit hole matching the metal mesh 2 can be further provided on the outer surface of the back cover 10, the metal mesh 2 is snapped into the snap-fit hole on the outer surface of the back cover 10, and the metal vibration membrane 4 is installed on the side surface of the back cover 10, so as to improve the performance of the microphone.

[0027] Reference Figure 1 A circuit board 6 is mounted on the inner snap-fit of the shell 1, and an ASIC module 7 and a MEMS chip 8 are provided on the outer surface of the circuit board 6. The ASIC module 7 and the MEMS chip 8 are electrically connected through multiple gold wires. The effective cooperation between the ASIC module 7 and the MEMS chip 8 can ensure that the microphone collects sound and converts it into an electrical signal for transmission.

[0028] Working principle: When in use, first install the microphone at the designated position, and then electrically connect the microphone to the external system through the electrical connector 11. At this time, it can be used normally. During operation, the external sound passes through the metal mesh 2 and drives the metal vibration membrane 4 to vibrate, and then drives the air inside the shell 1 to vibrate, so that the MEMS chip 8 can collect the sound. Then the effective cooperation of the ASIC module 7 and the MEMS chip 8 can transmit the generated current outward. Since the first aluminum foil 5 is pasted on the inner wall of the shell 1 and the second aluminum foil 9 is pasted on the inner wall of the back cover 10, the first aluminum foil 5 and the second aluminum foil 9 can be used to wrap the electrical components of the microphone, thereby improving the electromagnetic shielding performance of the entire microphone and ensuring that the microphone can work stably.

[0029] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A MEMS microphone with high electromagnetic shielding effect, comprising a housing (1), characterized in that: A first aluminum foil (5) is adhered to the inner wall of the shell (1), a rear cover plate (10) is snap-fitted to the port of the shell (1), a second aluminum foil (9) is adhered to the inner wall of the rear cover plate (10), a mounting hole is provided at a middle position on the outer surface of one side of the shell (1), and a metal mesh (2) is snap-fitted inside the mounting hole.

2. The MEMS microphone with high electromagnetic shielding effect according to claim 1, characterized in that: A connecting ring (3) is snap-fitted on the inner end surface of the shell (1); the connecting ring (3) is located on one side of the metal mesh (2), and the connecting ring (3) and the circular metal mesh (2) share a common central axis.

3. The MEMS microphone with high electromagnetic shielding effect according to claim 2, characterized in that: A metal vibration membrane (4) is provided inside the connecting ring (3).

4. The MEMS microphone with high electromagnetic shielding effect according to claim 1, characterized in that: A circuit board (6) is mounted on the inner snap fastener of the housing (1), and an ASIC module (7) and a MEMS chip (8) are provided on the outer surface of the circuit board (6).

5. The MEMS microphone with high electromagnetic shielding effect according to claim 4, characterized in that: A mounting hole is provided on the outer surface of the rear cover plate (10), and an electrical connector (11) is mounted inside the mounting hole by snap-fitting, and the electrical connector (11) is electrically connected to the circuit board (6).

6. The MEMS microphone with high electromagnetic shielding effect according to claim 4, characterized in that: The ASIC module (7) and the MEMS chip (8) are electrically connected via a plurality of gold wires.

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