Composite silicon microphone

Abstract

The utility model relates to a composite silicon microphone, which belongs to the technical field of microphones and comprises an upper shell, a lower shell is welded at the bottom end of the upper shell, a sound inlet hole is arranged in the upper shell, a dust screen is arranged in the sound inlet hole, and the dust screen adopts the design of small holes at the edge and a large hole in the center. A containing groove is formed in the upper shell and located on one side of the dustproof net, a rotating shaft is rotationally installed in the containing groove, and the dustproof net is fixedly connected with the outer side of the rotating shaft. The beneficial effects of the utility model lie in that the holes in the dustproof net are non-uniformly distributed, the acoustic resistance and mechanical strength can be balanced, the frequency response flatness can be further improved, and the dustproof net is rotatably arranged, so that the dustproof net can be rotated to the upper shell when a worker cleans dust on the dustproof net, and the working efficiency is improved. According to the utility model, the silicon microphone is cleaned by the brush, so that dust falls on the upper shell, the dust entering the upper shell and the lower shell can be reduced, and the sound receiving quality of the silicon microphone can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of microphone technology, and in particular to a composite silicon microphone. Background Technology

[0002] With the technological breakthroughs and development of electroacoustic silicon microphones in the electronics field, silicon microphones have become widely used in many electronic devices, communication devices, medical devices and other fields due to their advantages over ordinary microphones: they can directly convert sound into electrical signals, have ultra-high sensitivity, are drop-resistant and shock-resistant, small in size, light in weight and high in temperature.

[0003] A search revealed a Chinese patent for a composite silicon microphone (authorization announcement number CN216253242U), which includes a silicon microphone, a circuit board, and a housing. The circuit on the circuit board connects the signal transmission end and pins of the silicon microphone, changing the usage method of the silicon microphone from surface mount technology (SMT) to soldering. This patented technology reduces the installation difficulty and improves the compatibility of the silicon microphone while retaining the advantages of the silicon microphone.

[0004] However, the above-mentioned devices still have some drawbacks in actual use. The most obvious one is that dust screens are currently installed at the sound inlet of silicon microphones to prevent dust. However, most of these dust screens are designed with traditional back plate holes. Such dust screens can easily lead to sound pressure loss and high frequency attenuation in microphone applications. Moreover, the current method for cleaning dust screens is to use a brush to sweep the dust. However, this method causes some dust to fall into the housing under the pressure of the brush head, which in turn reduces the microphone's sound reception quality. Utility Model Content

[0005] In view of the above-mentioned problems existing in the prior art, the main objective of this utility model is to provide a composite silicon microphone.

[0006] The technical solution of this utility model is as follows: a composite silicon microphone includes an upper shell, a lower shell welded to the bottom of the upper shell, a sound inlet hole inside the upper shell, a dustproof mesh inside the sound inlet hole, the dustproof mesh having a design of small holes at the edges and a large hole in the center, a receiving groove inside the upper shell and on one side of the dustproof mesh, a rotating shaft rotatably mounted inside the receiving groove, and the dustproof mesh being fixedly connected to the outside of the rotating shaft.

[0007] By adopting the above technical solution, the dustproof net is designed to rotate, allowing workers to rotate the dustproof net onto the upper shell and clean it with a brush. This causes the dust to fall onto the upper shell, reducing the amount of dust entering the upper and lower shells.

[0008] In a preferred embodiment, a fixing component is provided inside the upper housing. The fixing component includes a slide groove formed inside the upper housing and located on one side of the sound inlet. A limiting plate is slidably connected inside the slide groove, and a plug rod is fixedly connected inside the limiting plate.

[0009] By adopting the above technical solution, the end of the plug is separated from the plug hole, thereby releasing the purpose of limiting the dustproof net.

[0010] In a preferred embodiment, the fixing assembly further includes an insertion hole formed inside the dustproof mesh, one end of the insertion rod extending into the insertion hole, and a spring sleeved on the outer side of the insertion rod.

[0011] By adopting the above technical solution, the spring can be used to push the limiting plate and the insertion rod to move continuously towards the dustproof net, so that the insertion rod and the insertion hole are in a locked state.

[0012] In a preferred embodiment, a cavity partition is fixedly connected to the side of the upper housing near the lower housing, a silicon diaphragm is fixedly connected to the bottom of the cavity partition, an RF anti-interference circuit is welded to the inner wall of the lower housing, a micro-integrated circuit board is fixedly mounted on the top of the RF anti-interference circuit, and a capacitor is fixedly connected to the side of the micro-integrated circuit board away from the RF anti-interference circuit.

[0013] By adopting the above technical solution, the capacitance value of the capacitor can be changed by the vibration of the silicon diaphragm, and the micro-integrated circuit board will detect this change and convert it into an electrical signal output.

[0014] In a preferred embodiment, the capacitor abuts against the silicon diaphragm, and the spring is disposed between the inner wall of the limiting plate and the slide groove.

[0015] By adopting the above technical solution, the stability of the silicon diaphragm can be ensured.

[0016] In a preferred embodiment, pins are fixedly connected to both ends of the bottom of the lower housing, and the silicon diaphragm is made of silicon carbide.

[0017] By adopting the above technical solution and using a silicon diaphragm made of silicon carbide, both flexibility and rigidity can be taken into account, and distortion can be reduced.

[0018] In a preferred embodiment, the end of the insertion rod away from the dustproof net extends to the outside of the upper housing and is fixedly connected with a pull ring.

[0019] By adopting the above technical solution and using pull rings, workers can unlock the dustproof net.

[0020] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0021] 1. In this utility model, the holes in the dustproof net are non-uniformly distributed, which can balance the acoustic impedance and mechanical strength, thereby improving the frequency response flatness. In addition, the dustproof net is designed to rotate, so that when the staff cleans the dust on the dustproof net, they can rotate the dustproof net onto the upper shell and use a brush to clean it, so that the dust falls on the upper shell, which can reduce the amount of dust entering the upper and lower shells, thereby ensuring the sound reception quality of the silicon microphone.

[0022] 2. In this utility model, when workers need to clean the dust on the dustproof net, they can pull the plug rod to disengage the end of the plug rod from the plug hole, thereby releasing the purpose of limiting the dustproof net. Furthermore, through the setting of the spring, the limiting plate and the plug rod can be pushed to move continuously towards the dustproof net, so that the plug rod and the plug hole are in a snap-fit ​​state, thereby achieving the purpose of fixing the dustproof net. Attached Figure Description

[0023] Figure 1 An overall perspective view of a composite silicon microphone provided by this utility model;

[0024] Figure 2 An exploded view of a composite silicon microphone provided by this utility model;

[0025] Figure 3 A cross-sectional view of a composite silicon microphone provided by this utility model;

[0026] Figure 4 This utility model provides a composite silicon microphone. Figure 3 Enlarged view of point A in the middle.

[0027] Legend: 1. Upper housing; 2. Lower housing; 3. Dustproof mesh; 4. Cavity partition; 5. Silicon diaphragm; 6. Capacitor; 7. Micro-integrated circuit board; 8. RF anti-interference circuit; 9. Pin; 10. Shaft; 11. Receiving groove; 12. Slide groove; 13. Socket; 14. Insert rod; 15. Spring; 16. Limiting plate. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] Reference Figure 1-4A composite silicon microphone includes an upper housing 1, with a lower housing 2 welded to the bottom of the upper housing 1. An inlet hole is provided inside the upper housing 1, and a dustproof mesh 3 is installed inside the inlet hole. The dustproof mesh 3 features a design with small holes at the edges and a large hole in the center. A receiving groove 11 is provided inside the upper housing 1, located on one side of the dustproof mesh 3. A rotating shaft 10 is rotatably mounted inside the receiving groove 11. The dustproof mesh 3 is fixedly connected to the outer side of the rotating shaft 10. The holes in the dustproof mesh 3 are non-uniformly distributed, which can balance acoustic impedance and mechanical strength, thereby improving frequency response flatness. Furthermore, the dustproof mesh 3 is rotatable, allowing workers to rotate it onto the upper housing 1 and clean it with a brush, causing the dust to fall onto the upper housing 1. This reduces the amount of dust entering the upper housing 1 and lower housing 2, thus ensuring the sound reception quality of the silicon microphone.

[0030] Specifically, the upper housing 1 has a fixing component inside, which includes a slide groove 12 located inside the upper housing 1 on one side of the sound inlet. A limiting plate 16 is slidably connected inside the slide groove 12, and a rod 14 is fixedly connected inside the limiting plate 16. When the staff needs to clean the dust on the dustproof net 3, the staff can pull the rod 14 to disengage the end of the rod 14 from the insertion hole 13, thereby releasing the limiting purpose of the dustproof net 3. The fixing component also includes an insertion hole 13 inside the dustproof net 3, with one end of the rod 14 extending into the insertion hole 13. Through the setting of the spring 15, the limiting plate 16 and the rod 14 can be pushed to move continuously towards the dustproof net 3, so that the rod 14 is engaged with the insertion hole 13, thereby achieving the purpose of fixing the dustproof net 3. To ensure the stability of the silicon microphone during use, a spring 15 is fitted on the outer side of the plug 14. A cavity partition 4 is fixedly connected to the side of the upper housing 1 near the lower housing 2. A silicon diaphragm 5 is fixedly connected to the bottom of the cavity partition 4. An RF anti-interference circuit 8 is welded to the inner wall of the lower housing 2. A micro-integrated circuit board 7 is fixedly installed on the top of the RF anti-interference circuit 8. When sound enters the sound transmission cavity formed by the cavity partition 4 through the sound inlet, it will act on the silicon diaphragm 5, causing the silicon diaphragm 5 to vibrate, which in turn changes the capacitance value of the capacitor 6. The micro-integrated circuit board 7 will detect this change and convert it into an electrical signal output. By reading these electrical signals, sound recognition and recording can be achieved. A capacitor 6 is fixedly connected to the side of the micro-integrated circuit board 7 away from the RF anti-interference circuit 8.

[0031] Specifically, capacitor 6 abuts against silicon diaphragm 5, spring 15 is set between the inner wall of limit plate 16 and slide 12, pins 9 are fixedly connected to both ends of the bottom of lower housing 2, which can provide the DC power required by silicon microphone, silicon diaphragm 5 is made of silicon carbide material, which can balance flexibility and rigidity and reduce distortion, and the end of plug 14 away from dustproof net 3 extends to the outside of upper housing 1 and is fixedly connected to pull ring, so that the staff can unlock dustproof net 3.

[0032] Working principle: First, when sound enters the sound transmission cavity formed by the cavity partition 4 through the sound inlet, it acts on the silicon diaphragm 5, causing the silicon diaphragm 5 to vibrate. This changes the capacitance value of the capacitor 6, and the micro-integrated circuit board 7 detects this change and converts it into an electrical signal output. By reading these electrical signals, sound recognition and recording can be achieved. The non-uniform distribution of the holes in the dustproof mesh 3 can balance the acoustic impedance and mechanical strength, thereby improving the frequency response flatness. When the staff needs to clean the dust on the dustproof mesh 3, they can pull the pull ring to move the plug rod 14, causing the end of the plug rod 14 to disengage from the plug hole 13. This releases the limiting purpose of the dustproof mesh 3, allowing it to be rotated onto the upper housing 1 and cleaned with a brush. This causes the dust to fall onto the upper housing 1, reducing the amount of dust entering the upper housing 1 and lower housing 2, thus ensuring the sound reception quality of the silicon microphone.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0034] The above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A composite silicon microphone, comprising an upper housing (1), characterized in that: The bottom end of the upper shell (1) is welded to the lower shell (2). The upper shell (1) has a sound inlet hole inside. The sound inlet hole is equipped with a dustproof net (3). The dustproof net (3) adopts a design with small holes at the edges and a large hole in the center. The upper shell (1) has a receiving groove (11) inside and on one side of the dustproof net (3). A rotating shaft (10) is rotatably installed inside the receiving groove (11). The dustproof net (3) is fixedly connected to the outside of the rotating shaft (10).

2. The composite silicon microphone according to claim 1, characterized in that: The upper housing (1) is provided with a fixing component inside. The fixing component includes a slide groove (12) opened inside the upper housing (1) and located on one side of the sound inlet hole. A limiting plate (16) is slidably connected inside the slide groove (12). A plug rod (14) is fixedly connected inside the limiting plate (16).

3. A composite silicon microphone according to claim 2, characterized in that: The fixing assembly also includes a socket (13) opened inside the dustproof net (3), one end of the plug (14) extends into the socket (13), and a spring (15) is sleeved on the outside of the plug (14).

4. A composite silicon microphone according to claim 3, characterized in that: A cavity partition (4) is fixedly connected to the side of the upper housing (1) near the lower housing (2). A silicon diaphragm (5) is fixedly connected to the bottom of the cavity partition (4). An RF anti-interference circuit (8) is welded to the inner wall of the lower housing (2). A micro-integrated circuit board (7) is fixedly installed on the top of the RF anti-interference circuit (8). A capacitor (6) is fixedly connected to the side of the micro-integrated circuit board (7) away from the RF anti-interference circuit (8).

5. A composite silicon microphone according to claim 4, characterized in that: The capacitor (6) abuts against the silicon diaphragm (5), and the spring (15) is disposed between the inner wall of the limiting plate (16) and the slide (12).

6. A composite silicon microphone according to claim 4, characterized in that: The bottom of the lower housing (2) is fixedly connected to pins (9) at both ends, and the silicon diaphragm (5) is made of silicon carbide.

7. A composite silicon microphone according to claim 3, characterized in that: The end of the insertion rod (14) away from the dustproof net (3) extends to the outside of the upper housing (1) and is fixedly connected with a pull ring.

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