High-adaptation noise reduction MEMS microphone

Abstract

The utility model discloses a high adaptation type noise reduction MEMS microphone, relates to the technical field of microphones, and aims to solve the problems that the existing MEMS microphone is insufficient in adaptation to different installation modes and the on-site installation flexibility needs to be improved. A rear end cover is buckled outside the PCB in a covering mode, the rear end cover is connected with the shell in a buckled mode, a universal seat is fixedly connected to the outer surface of the rear end cover, a connecting end is universally connected to the interior of a mounting hole of the universal seat, two adsorption structures are arranged on the outer surface of the rear end cover, and the two adsorption structures are arranged on the outer surface of the rear end cover. The two adsorption structures are symmetrically distributed on the two sides of the universal seat, each adsorption structure comprises a support, a connecting seat is fixedly connected to the inner side face of each support, and limiting strips are fixedly connected to the symmetrical inner walls of each connecting seat. And the effects of being capable of effectively adapting to different installation environments and high in on-site installation flexibility are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of microphones, in particular to a highly adaptable noise-canceling MEMS microphone. 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 wafer, which can be manufactured using surface-mount technology, can withstand high reflow soldering temperatures, is easy to integrate with CMOS technology and other audio circuits, and has improved noise cancellation performance and good RF and EMI suppression performance. Due to its advantages, MEMS microphones are used for sound acquisition and conversion in more and more occasions.

[0003] Existing MEMS microphones have deficiencies in adapting to different installation methods, and the on-site installation flexibility needs to be improved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a highly adaptable noise-canceling MEMS microphone that can effectively adapt to different installation environments and has high on-site installation flexibility.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A highly adaptable noise-canceling MEMS microphone includes a housing. A PCB board is adhered to the port of the housing. A rear end cover is buckled outside the PCB board. The rear end cover is snap-connected to the housing. A universal joint is fixedly connected to the outer surface of the rear end cover. A connecting end is universally connected in the mounting hole of the universal joint. Two adsorption structures are arranged on the outer surface of the rear end cover, and the two adsorption structures are symmetrically distributed on both sides of the universal joint.

[0007] By adopting the above technical solution, the microphone can be adapted to different installation places.

[0008] Further, the adsorption structure includes a bracket. A connecting seat is fixedly connected to the inner side surface of the bracket. Limiting strips are fixedly connected to the symmetric inner walls of the connecting seat. A movable support foot is slidably connected to the inside of the connecting seat. Limiting chutes are arranged on the symmetric side surfaces of the movable support foot. The limiting strips are engaged in the limiting chutes. Telescopic damping rods are fixedly connected to the symmetric inner walls of the connecting seat. The other ends of the telescopic damping rods abut against the side surfaces of the movable support foot. Springs are sleeved outside the telescopic damping rods.

[0009] By adopting the above technical solution, the mutual cooperation of the telescopic damping rods and the springs can be used to perform shock absorption operations on both sides of the movable support foot, improving the working stability of the microphone.

[0010] Furthermore, an adhesive layer is provided on the outer surface of the movable support leg.

[0011] By adopting the above technical solution, it is convenient to paste the movable support leg on the outer surface of the external structure.

[0012] Furthermore, sound holes are provided on the outer surface of the housing, and a noise reduction end head is snap-fitted inside the sound holes. A partition piece is provided in the through hole at the central axis position of the noise reduction end head.

[0013] By adopting the above technical solution, the partition piece inside the noise reduction end head can be used to divide the air flow passing above the sound holes, avoiding resonance inside the housing.

[0014] Furthermore, an anti-collision strip is sleeved and wrapped on the outer surface of the housing.

[0015] By adopting the above technical solution, the anti-collision strip can be used to perform anti-collision protection on the housing.

[0016] Furthermore, a micro-motor system and an ASIC chip are adhesively connected to the outer surface of the PCB board through die bonding glue. The micro-motor system and the ASIC chip are electrically connected through gold wires. A wire hole is provided on the outer surface of the rear end cover.

[0017] By adopting the above technical solution, the micro-motor system can be used to convert sound signals into electrical signals, and then the ASIC chip can be used to convert the electrical signals into digital signals and perform transmission operations.

[0018] In summary, the beneficial technical effects of the present utility model are as follows:

[0019] 1. The connection end of the present utility model can be inserted into the end of the external support rod. Since one end of the connection end is universally connected inside the universal joint, the connection end can be used to provide a support for the microphone. At the same time, the adsorption structure can be used to adsorb and fix the microphone on the installation surface of the external structure, and the adsorption structure provides another way of support for the fixation of the microphone. This structure can effectively improve the adaptability of the microphone to different installation environments, and the practicability is effectively improved;

[0020] 2. By installing a noise reduction end head at the sound hole of the housing, the partition piece at the central through hole of the noise reduction end head can be used to eliminate the resonance generated by the external air flow passing through the sound hole, effectively improving the noise reduction performance of the microphone, and further improving the practicability. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 This is the second perspective view of the three-dimensional structure of the present utility model;

[0023] Figure 3 This is the schematic diagram of the three-dimensional structure of the adsorption structure of the present utility model.

[0024] In the figure: 1, housing; 2, anti-collision strip; 3, noise reduction end; 4, PCB board; 5, micro-motor system; 6, ASIC chip; 7, rear end cover; 8, wire hole; 9, adsorption structure; 10, universal joint; 11, connecting end; 12, bracket; 13, connecting seat; 14, limiting strip; 15, movable support foot; 16, telescopic damping rod; 17, spring; 18, glue layer. Specific embodiments

[0025] The method of the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] Referring to the attached Figure 1 and the attached Figure 2 , a highly adaptable noise reduction MEMS microphone, comprising a housing 1, a PCB board 4 is adhered to the port of the housing 1, the outside of the PCB board 4 is covered with a rear end cover 7, the rear end cover 7 is snap-connected to the housing 1, a universal joint 10 is fixedly connected to the outer surface of the rear end cover 7, a connecting end 11 is universally connected in the mounting hole of the universal joint 10, two adsorption structures 9 are arranged on the outer surface of the rear end cover 7, and the two adsorption structures 9 are symmetrically distributed on both sides of the universal joint 10. An anti-collision strip 2 is sleeved and wrapped on the outer surface of the housing 1. The connecting end 11 can be inserted into the end of an external support rod. Since one end of the connecting end 11 is universally connected inside the universal joint 10, the connecting end 11 can be used to provide a support for the microphone. At the same time, the adsorption structure 9 can be used to adsorb and fix the microphone on the mounting surface of the external structure, and the adsorption structure 9 is used to provide another way of supporting operation for the fixation of the microphone. This structure can effectively improve the adaptability of the microphone to different installation environments, and the practicability is effectively improved.

[0027] Referring to Figure 2 and Figure 3, the adsorption structure 9 includes a bracket 12. A connecting seat 13 is fixedly connected to the inner side surface of the bracket 12. Limiting strips 14 are fixedly connected to the symmetric inner walls of the connecting seat 13. An active support leg 15 is slidably connected to the inside of the connecting seat 13. Limiting chutes are provided on the symmetric side surfaces of the active support leg 15. The limiting strips 14 are engaged inside the limiting chutes. Telescopic damping rods 16 are fixedly connected to the symmetric inner walls of the connecting seat 13. The other ends of the telescopic damping rods 16 abut against the side surfaces of the active support leg 15. Springs 17 are sleeved outside the telescopic damping rods 16. An adhesive layer 18 is provided on the outer surface of the active support leg 15. The microphone can be pasted at a specified position by using the adhesive layer 18. At this time, the adsorption structure 9 can provide support for the housing 1 and the structures inside the housing 1. During the support process, the active support leg 15 is slidably connected to the inside of the connecting seat 13. At the same time, the telescopic damping rods 16 and springs 17 provided on both sides of the active support leg 15 can perform shock absorption operations, effectively improving the working stability of the microphone and avoiding the influence of external vibrations on the microphone.

[0028] Refer to Figure 1 , sound holes are provided on the outer surface of the housing 1, and a noise reduction end 3 is snap-fitted inside the sound holes. A partition is provided in the through hole at the central axis position of the noise reduction end 3. By installing the noise reduction end 3 at the sound holes of the housing 1, the partition at the through hole of the central axis of the noise reduction end 3 can be used to eliminate the resonance generated by the external airflow passing through the sound holes, effectively improving the noise reduction performance of the microphone and further improving the practicability.

[0029] Refer to Figure 1 , a microelectromechanical system 5 and an ASIC chip 6 are adhesively connected to the outer surface of the PCB board 4 by die bonding glue. The microelectromechanical system 5 and the ASIC chip 6 are electrically connected by gold wires. A wire hole 8 is provided on the outer surface of the rear end cover 7. The microelectromechanical system 5 is composed of a diaphragm, a back plate, and a parallel plate capacitor. The sound signal can be converted into an electrical signal by using the diaphragm in the microelectromechanical system 5, and then the electrical signal is amplified by using the ASIC chip 6. Then the electrical signal is converted into a digital signal and a transmission operation is performed.

[0030] Working principle: When in use, select the corresponding installation structure according to the on-site installation method. One end of the connection end 11 can be inserted into one end of the external support rod. Since the other end of the connection end 11 is universally connected to the universal joint 10, the connection end 11 can provide good support for the microphone and can flexibly and conveniently adjust the orientation of the microphone. At the same time, the glue layer 18 on the adsorption structure 9 can be directly used to adhere and adsorb the adsorption structure 9 on the surface of the external object. At this time, the adsorption structure 9 can provide good support for the microphone. Since the movable support feet 15 are slidably connected to the inside of the connection seat 13, and the telescopic damping rods 16 and springs 17 arranged on both sides of the movable support feet 15 can perform shock absorption operations, it can effectively improve the working stability of the microphone and avoid the influence of external vibrations on the microphone. When working, external sound passes through the noise reduction end 3 and enters the inside of the housing 1, and then the diaphragm in the micro-motor system 5 is used to convert the sound signal into an electrical signal. Then, the ASIC chip 6 is used to amplify the electrical signal, and then the electrical signal is converted into a digital signal and a transmission operation is performed.

[0031] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A highly adaptable noise reduction MEMS microphone, comprising a housing (1), characterized in that: A PCB board (4) is adhered to the port of the shell (1), a rear end cover (7) is buckled on the outer cover of the PCB board (4), the rear end cover (7) is snap-connected to the shell (1), a universal seat (10) is fixedly connected to the outer surface of the rear end cover (7), a connecting end (11) is universally connected in the mounting hole of the universal seat (10), and two adsorption structures (9) are arranged on the outer surface of the rear end cover (7), and the two adsorption structures (9) are symmetrically distributed at two sides of the universal seat (10).

2. The highly adaptable noise reduction MEMS microphone according to claim 1, characterized in that: The adsorption structure (9) comprises a bracket (12), a connecting seat (13) is fixedly connected to the inner side surface of the bracket (12), a limiting strip (14) is fixedly connected to the symmetrical inner wall of the connecting seat (13), a movable support foot (15) is slidably connected to the inner side of the connecting seat (13), a limiting slide groove is arranged on the symmetrical side surface of the movable support foot (15), the limiting strip (14) is engaged in the inside of the limiting slide groove, a telescopic damping rod (16) is fixedly connected to the symmetrical inner wall of the connecting seat (13), the other end of the telescopic damping rod (16) is against the side surface of the movable support foot (15), and a spring (17) is sleeved on the outside of the telescopic damping rod (16).

3. The highly adaptable noise reduction MEMS microphone according to claim 2, characterized in that: A glue layer (18) is provided on the outer surface of the movable support foot (15).

4. The highly adaptable noise reduction MEMS microphone according to claim 1, characterized in that: A sound hole is provided on the outer surface of the shell (1), and a noise reduction end head (3) is buckled and installed inside the sound hole, and a separator is provided in the through hole at the central axis position of the noise reduction end head (3).

5. The highly adaptable noise reduction MEMS microphone according to claim 1, characterized in that: An anti-collision strip (2) is sleeved and wrapped on the outer surface of the shell (1).

6. The highly adaptable noise reduction MEMS microphone according to claim 1, characterized in that: A micro-motor system (5) and an ASIC chip (6) are bonded to the outer surface of the PCB board (4) by means of a solid crystal adhesive, the micro-motor system (5) and the ASIC chip (6) are electrically connected by means of a gold wire, and a wire hole (8) is provided on the outer surface of the rear end cover (7).

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