MEMS microphone structure with foreign matter protection design

Abstract

The utility model discloses an MEMS microphone structure with a foreign matter protection design, relates to the technical field of MEMS microphones, and aims to solve the problems that an installation gap design is lacked in the conventional MEMS microphone, once a foreign matter enters the interior of the microphone, the foreign matter is inconvenient to move to the bottom end of the interior of the microphone, is easy to attach and clamp on an internal electronic component, and is easy to damage. According to the technical scheme, the microphone comprises a shell, a circuit board is arranged in the shell, a plurality of buckle blocks are installed on the edges of the periphery of the circuit board in a buckled mode respectively, an installation support is arranged outside the circuit board, a plurality of insertion grooves are formed in the inner wall of the installation support, and the insertion grooves are formed in the inner wall of the installation support. The buckle blocks are inserted into the insertion grooves, and the outer portion of the installation support is wrapped with a rubber air bag. The probability that the foreign matter enters the microphone can be reduced, once the foreign matter enters the microphone, the foreign matter can be effectively prevented from being attached and clamped on the electronic element of the microphone, and the working stability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of MEMS microphones, in particular to a MEMS microphone structure with a foreign body protection design. Background Art

[0002] A MEMS microphone is a microphone manufactured based on MEMS technology. Simply put, it is a capacitor integrated on a micro silicon chip. It can be manufactured using a surface mount process, can withstand very high reflow soldering temperatures, is easy to integrate with CMOS processes and other audio circuits, and has improved noise cancellation performance and good RF and EMI suppression capabilities. It is widely used in many contemporary electronic devices.

[0003] Existing MEMS microphones lack an internal installation gap design. Once foreign matter enters the microphone, it is difficult for the foreign matter to move to the bottom of the interior and it is easy to attach and get stuck on the internal electronic components, affecting the normal use of the microphone. Utility Model Content

[0004] The purpose of the utility model is to provide a MEMS microphone structure with a foreign body protection design that can reduce the probability of foreign bodies entering the microphone. Once foreign bodies enter, it can effectively prevent the foreign bodies from adhering to and getting stuck on the electronic components of the microphone, and has strong working stability.

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

[0006] A MEMS microphone structure with a foreign body protection design includes a shell, a circuit board is arranged inside the shell, and a plurality of snap blocks are respectively snap-mounted at the four edges of the circuit board. A mounting bracket is provided on the outside of the circuit board, and a plurality of slots are provided on the inner wall of the mounting bracket. The snap blocks are inserted into the slots. The outside of the mounting bracket is wrapped with a rubber airbag.

[0007] By adopting the above technical solution, an installation gap is provided inside the shell to ensure that foreign matter can be effectively moved to the bottom end of the shell. The installation of the rubber airbag improves the shock absorption performance inside the microphone.

[0008] Furthermore, a cotton block installation groove is provided on the upper surface of the shell, and a dustproof cotton block is adhered to the inner end surface of the cotton block installation groove.

[0009] By adopting the above technical solution, dust particles can be effectively blocked from entering the interior of the shell, and the dust-proof cotton blocks can be replaced flexibly and conveniently, with high flexibility in use.

[0010] Furthermore, a sound-transmitting hole is provided at a middle position of the inner end surface of the cotton block installation groove, and a filter is mounted on the inner buckle of the sound-transmitting hole.

[0011] By adopting the above technical solution, the filter can be used to prevent larger particles of foreign matter from entering the interior of the housing.

[0012] Furthermore, a buckle groove is provided on the inner wall of the shell, and the rubber airbag buckle is installed inside the buckle groove.

[0013] By adopting the above technical solution, the rubber airbag can be effectively installed at a designated position inside the shell.

[0014] Furthermore, a MEMS chip and a power supply module are provided on the outer surface of the circuit board, and the MEMS chip and the power supply module are electrically connected through a plurality of gold wires.

[0015] By adopting the above technical solution, it is ensured that the microphone can perform effective sound collection and conversion operations.

[0016] Furthermore, a limit baffle is snap-fitted onto the back of the shell.

[0017] By adopting the above technical solution, the stability of the internal structure of the microphone is ensured.

[0018] Furthermore, a flexible film is pasted on the back of the limit baffle, a glue layer is provided on the inner side of the flexible film, a mounting hole is provided on the outer surface of the flexible film, and a rubber block is installed on the inner buckle of the mounting hole, and a cross groove is provided on the outer surface of the rubber block.

[0019] By adopting the above technical solution, the flexible membrane can be used to seal the back of the shell, and the glue layer on the inner side of the flexible membrane can be used to absorb tiny impurities inside the shell. The cross groove on the rubber block can facilitate the penetration of the connecting wire.

[0020] In summary, the beneficial technical effects of the present invention are:

[0021] 1. The present invention secures the circuit board with the snap block and mounting bracket, effectively ensuring the stability of the circuit board and a certain gap between the circuit board and the mounting bracket. This ensures that any foreign matter that enters the housing effectively falls to the bottom of the housing and does not adhere to or get stuck on the circuit board, effectively improving the stability of the microphone.

[0022] 2. The present invention wraps a rubber airbag around the outside of the mounting bracket, which is then snapped into place inside the housing. This allows for shock absorption, effectively improving the microphone's operational stability and shockproof properties.

[0023] 3. The utility model can effectively prevent particles and foreign matter from entering the interior of the housing through the sound-transmitting hole by installing a filter on the sound-transmitting hole of the housing. At the same time, the dust-proof cotton block is covered on the outside of the filter, which can be used to prevent tiny dust particles from entering the interior of the housing. The dust-proof cotton block can be flexibly replaced, and the use flexibility is high; BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a first perspective view of the three-dimensional structure of the utility model;

[0025] Figure 2 This is a second viewing angle diagram of the three-dimensional structure of the present invention.

[0026] In the figure: 1. Shell; 2. Filter; 3. Dust-proof cotton block; 4. Cotton block mounting slot; 5. Circuit board; 6. MEMS chip; 7. Power supply module; 8. Buckle block; 9. Mounting bracket; 10. Rubber airbag; 11. Limit baffle; 12. Buckle slot; 13. Flexible membrane; 14. Rubber block. DETAILED DESCRIPTION

[0027] The method of the utility model is further described in detail below with reference to the accompanying drawings.

[0028] Reference Figure 1 、 Figure 2 A MEMS microphone structure with foreign body protection design includes a shell 1, a circuit board 5 is provided inside the shell 1, and a plurality of snap blocks 8 are snap-fitted on the four edges of the circuit board 5. A mounting bracket 9 is provided on the outside of the circuit board 5, and a plurality of slots are provided on the inner wall of the mounting bracket 9. The snap blocks 8 are inserted into the slots. The outside of the mounting bracket 9 is wrapped with a rubber airbag 10. A snap groove is provided on the inner wall of the shell 1. The rubber airbag 10 is snap-fitted inside the snap groove. A limit baffle 11 is snap-fitted on the back of the shell 1. While the bracket 9 fixes the circuit board 5, it can effectively ensure the stability of the circuit board 5 and ensure that there is a certain gap between the circuit board 5 and the mounting bracket 9, ensuring that foreign matter entering the interior of the shell 1 can effectively fall to the bottom of the shell 1 without being attached to the circuit board 5, effectively improving the stability of the microphone. By wrapping the rubber airbag 10 on the outside of the mounting bracket 9 and the rubber airbag 10 being engaged with the inside of the shell 1, the rubber airbag 10 can be used for shock absorption operation, effectively improving the stability and shockproof properties of the microphone.

[0029] Reference Figure 1A cotton block mounting groove 4 is provided on the upper surface of the shell 1, and a dust-proof cotton block 3 is adhered to the inner end surface of the cotton block mounting groove 4. A sound-transmitting hole is provided in the middle position of the inner end surface of the cotton block mounting groove 4, and a filter screen 2 is installed with a buckle inside the sound-transmitting hole. By installing the filter screen 2 on the sound-transmitting hole of the shell 1, it can effectively prevent particle foreign matter from passing through the sound-transmitting hole and entering the interior of the shell 1. At the same time, the dust-proof cotton block 3 is covered on the outside of the filter screen 2. The dust-proof cotton block 3 can be used to prevent tiny dust particles from entering the interior of the shell 1, and the dust-proof cotton block 3 can be flexibly replaced, and the use flexibility is high.

[0030] Reference Figure 1 A MEMS chip 6 and a power supply module 7 are provided on the outer surface of the circuit board 5. The MEMS chip 6 and the power supply module 7 are electrically connected through multiple gold wires. The MEMS chip 6 and the power supply module 7 can cooperate with each other to realize sound collection and electrical signal conversion and transmission.

[0031] Reference Figure 1 A flexible film 13 is pasted on the back of the limit baffle 11, and a glue layer is provided on the inner side of the flexible film 13. A mounting hole is provided on the outer surface of the flexible film 13, and a rubber block 14 is installed with a snap inside the mounting hole. A cross groove is provided on the outer surface of the rubber block 14, wherein the flexible film 13 can be used to block the back of the microphone, and the glue layer on the flexible film 13 can be used to absorb small impurities inside the shell.

[0032] Working principle: When in use, first electrically connect the microphone to the external system, and then use it. The external sound passes through the sound hole on the shell 1 and enters the interior of the shell 1, and is collected by the MEMS chip 6. Then the MEMS chip 6 and the power supply module 7 cooperate with each other to realize the conversion and transmission of electrical signals. During the entire use process, by installing a filter 2 on the sound hole of the shell 1, it can effectively prevent particles and foreign matter from passing through the sound hole into the interior of the shell 1. At the same time, the outside of the filter 2 is covered with a dust-proof cotton block 3, which can be used to prevent tiny dust particles from entering the interior of the shell 1. The circuit board 5 is fixed by the snap block 8 and the mounting bracket 9, which can have It effectively ensures the stability of the circuit board 5 and ensures that there is a certain gap between the circuit board 5 and the mounting bracket 9. Once foreign matter enters the interior of the shell 1, it ensures that the foreign matter entering the interior of the shell 1 can effectively fall to the bottom of the shell 1 without being attached to the circuit board 5, which effectively improves the stability of the microphone. By wrapping the rubber airbag 10 on the outside of the mounting bracket 9 and the rubber airbag 10 being engaged with the inside of the shell 1, the rubber airbag 10 can be used for shock absorption operation, which effectively improves the stability and shockproof properties of the microphone. The flexible film 13 pasted on the limit baffle 11 can effectively block the back of the microphone and absorb small impurities inside the shell 1.

[0033] 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 structure with a foreign body protection design, comprising a housing (1), characterized in that: A circuit board (5) is provided inside the housing (1), and a plurality of snap blocks (8) are snap-fitted on four edges of the circuit board (5). A mounting bracket (9) is provided outside the circuit board (5), and a plurality of slots are provided on the inner wall of the mounting bracket (9), and the snap blocks (8) are inserted into the slots. The outside of the mounting bracket (9) is wrapped with a rubber airbag (10).

2. The MEMS microphone structure with a foreign body protection design according to claim 1, characterized in that: A cotton block installation groove (4) is provided on the upper surface of the shell (1), and a dustproof cotton block (3) is adhered to the inner end surface of the cotton block installation groove (4).

3. The MEMS microphone structure with foreign body protection design according to claim 2, characterized in that: A sound-transmitting hole is provided at the middle position of the inner end surface of the cotton block installation groove (4), and a filter screen (2) is mounted on the inner buckle of the sound-transmitting hole.

4. The MEMS microphone structure with foreign body protection design according to claim 1, characterized in that: A snap-fit groove (12) is provided on the inner wall of the housing (1), and the rubber airbag (10) is snap-fitted inside the snap-fit groove (12).

5. The MEMS microphone structure with foreign body protection design according to claim 1, characterized in that: A MEMS chip (6) and a power supply module (7) are provided on the outer surface of the circuit board (5); the MEMS chip (6) and the power supply module (7) are electrically connected via a plurality of gold wires.

6. The MEMS microphone structure with foreign body protection design according to claim 1, characterized in that: A limit baffle (11) is snap-fitted to the back of the housing (1).

7. The MEMS microphone structure with foreign body protection design according to claim 6, characterized in that: A flexible film (13) is adhered to the back of the limit baffle (11), a glue layer is provided on the inner side of the flexible film (13), a mounting hole is provided on the outer surface of the flexible film (13), and a rubber block (14) is mounted on the inner buckle of the mounting hole, and a cross groove is provided on the outer surface of the rubber block (14).

Images