Microporous waterproof sound receiver structure and condenser microphone

Abstract

The utility model relates to a micropore waterproof sound receiver structure and a condenser microphone, the micropore waterproof sound receiver structure comprises a housing and a sound receiving part, the end face of the top of the housing is provided with a plurality of sound receiving micropores, and the plurality of sound receiving micropores are uniformly distributed on the end face of the top of the housing close to the central position of the top of the housing; the sound receiving part is arranged in the shell; the sound receiving part comprises a vibrating diaphragm, a back electrode and a PCB, the vibrating diaphragm is arranged on the side, close to the sound receiving micropore, in the shell, the PCB is arranged at the end, away from the sound receiving micropore, of the shell, the back electrode is arranged between the PCB and the vibrating diaphragm, and the back electrode is electrically connected with the PCB; an equivalent capacitor is formed between the vibrating diaphragm and the back polar plate. According to the utility model, the sound receiving surface of the housing is provided with the plurality of sound receiving micropores, the surface tension of liquid is utilized, and the plurality of tiny sound receiving micropores play a waterproof role, so that the sound receiving effect of the sound receiving micropores is more ideal, and the distortion phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of condenser microphones, in particular to a microporous waterproof sound receiver structure and a condenser microphone. Background Art

[0002] Condenser microphones, also known as condenser microphones or electret microphones, are microphones that use changes in the size of capacitors to convert sound signals into electrical signals. Condenser microphones are widely used in recording studios, professional performances, conference hosting, online live broadcasts, game voice and many other occasions due to their superior performance. Whether it is a professional recording that pursues high sound quality or daily online live broadcasts and game voice communication, condenser microphones can provide a clear, delicate and accurate audio experience.

[0003] Capacitor microphones are sensitive to humid environments. In the prior art, the waterproofing of condenser microphones is mainly achieved by sticking a waterproof film on the sound receiving hole, which will affect the transmission of sound signals during use. The THD (total harmonic distortion) of the microphone is high, and the frequency curve of high frequencies will decrease. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects in the prior art that the waterproof film may cause distortion of the audio signal and a decrease in the frequency curve of the high frequency.

[0005] In order to solve the above technical problems, the utility model provides a microporous waterproof receiver structure, comprising:

[0006] A housing, wherein a plurality of sound receiving micro holes are provided on the end surface of the top of the housing, and a plurality of the sound receiving micro holes are evenly distributed on the end surface of the top of the housing near the center position of the top of the housing;

[0007] The sound receiving part is arranged inside the shell; the sound receiving part includes a diaphragm, a back electrode and a PCB board, the diaphragm is arranged on a side of the shell close to the sound receiving microhole, the PCB board is arranged on an end of the shell away from the sound receiving microhole, the back electrode is arranged between the PCB board and the diaphragm, and the back electrode is electrically connected to the PCB board; an equivalent capacitor is formed between the diaphragm and the back electrode plate.

[0008] In an embodiment of the present invention, the diameter of the sound receiving microhole is 0.001mm-0.014mm.

[0009] In one embodiment of the present invention, the distance between any two adjacent sound receiving micro holes is 0.01 mm-0.1 mm.

[0010] In an embodiment of the present invention, an annular boss is provided on one side of the diaphragm close to the sound receiving micro-hole.

[0011] In an embodiment of the present invention, a gasket is provided between the diaphragm and the back electrode.

[0012] In an embodiment of the present invention, a copper ring is provided between the back electrode and the PCB board.

[0013] In an embodiment of the present invention, a field effector is disposed on the surface of the PCB board, and the field effector is electrically connected to the equivalent capacitor.

[0014] In an embodiment of the present invention, a wire is disposed on a side of the PCB board away from the field effector, and the wire is electrically connected to the field effector through the PCB board.

[0015] In an embodiment of the present invention, an epoxy adhesive layer is provided between the housing and the PCB board.

[0016] A condenser microphone comprises the microporous waterproof receiver structure.

[0017] The above technical solution of the utility model has the following advantages compared with the prior art:

[0018] The micro-hole waterproof sound receiver structure and capacitor microphone described in the utility model have a plurality of sound receiving micro-holes on the sound receiving surface of the shell, and the surface tension of the liquid is used to fix the liquid in the plurality of sound receiving micro-holes to prevent the external liquid from entering the shell. It can effectively play a waterproof role, the sound receiving effect is more ideal, the distortion phenomenon is avoided, and the frequency curve of the high frequency is prevented from decreasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0020] Figure 1 It is a top view of the overall structure of the utility model;

[0021] Figure 2 It is a side view of the overall structure of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the cashier department in the utility model;

[0023] Figure 4 for Figure 3 The effect diagram of the micro-hole waterproofing of the center radio;

[0024] Explanation of the reference numerals in the specification: 1. outer shell; 2. sound receiving part; 3. wire; 11. sound receiving microhole; 21. diaphragm; 22. back electrode; 23. PCB board; 24. epoxy adhesive layer; 25. field effector; 26. gasket; 27. copper ring. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0026] Embodiment 1

[0027] Reference Figure 1-Figure 4 As shown, the utility model discloses a microporous waterproof receiver structure, comprising:

[0028] A housing 1, wherein a plurality of sound receiving micro holes 11 are provided on the end surface of the top of the housing 1, and a plurality of the sound receiving micro holes 11 are evenly distributed on the end surface of the top of the housing 1 near the center position of the top of the housing 1;

[0029] The sound receiving part 2 is arranged inside the shell 1; the sound receiving part 2 includes a diaphragm 21, a back electrode 22 and a PCB board 23, the diaphragm 21 is arranged on a side of the shell 1 close to the sound receiving micro-hole 11, the PCB board 23 is arranged at an end of the shell 1 away from the sound receiving micro-hole 11, the back electrode 22 is arranged between the PCB board 23 and the diaphragm 21, and the back electrode 22 is electrically connected to the PCB board 23; an equivalent capacitor is formed between the diaphragm 21 and the back electrode plate.

[0030] It can be seen that the structure of the sound receiver in the present invention is to install the sound receiving part 2 inside the housing 1, wherein the diaphragm 21, the back electrode 22 and the PCB board 23 constitute the basic structure of the entire sound receiver. Specifically, the diaphragm 21 and the back electrode 22 are arranged inside the housing 1 to form an equivalent capacitor. External sound causes the diaphragm 21 to vibrate, changing the distance between the two plates of the capacitor, thereby causing the capacity of the capacitor to change. Since the number of charges on the electret is always constant, according to the formula: Q=CU, when C changes, it will inevitably cause the voltage U at both ends of the capacitor to change, thereby outputting an electrical signal, realizing the conversion of the sound signal to the electrical signal.

[0031] In the utility model, a plurality of sound receiving micro holes 11 are provided on the sound receiving surface of the housing 1. By utilizing the surface tension of the liquid, the liquid can be fixed in the plurality of sound receiving micro holes 11 through the plurality of tiny sound receiving micro holes 11, thereby preventing the external liquid from entering the housing 1. Compared with the structure of installing a waterproof membrane on the surface of a larger sound receiving hole in the prior art, it can effectively play a waterproof role. Under normal circumstances, the waterproof airtight cavity is unobstructed. Since there is no waterproof membrane to block it, the sound receiving effect is more ideal and distortion is avoided. And the frequency curve of high frequencies can be effectively improved.

[0032] Furthermore, the diameter of the sound receiving micro hole 11 is 0.001 mm-0.014 mm.

[0033] Specifically, according to the calculation formula of the diameter of the sound receiving micro hole 11:

[0034] σπd*cosθ=ρgh*π(d / 2)2

[0035] σ is the surface tension of water. At room temperature of 20°C, σ=0.073N / m, h is the water depth (here the value is 1), and d is the diameter of the hole. ρ is the density of water, θ is the contact angle, which is the angle between the tangent of the gas-liquid interface at the intersection of three phases (gas, liquid and solid) and the solid wall. When θ>90°, the wall is hydrophobic; when θ<90°, the wall is hydrophilic. The material of the radio structure hole is generally hydrophilic. Take θ=60° for easy calculation. The result obtained by calculation is d=14.9μm.

[0036] Furthermore, the distance between any two adjacent sound receiving micro holes 11 is 0.01 mm to 0.1 mm. As a preferred embodiment of the present invention, the sound receiving micro holes 11 are distributed in the central circumferential direction of the sound receiving surface, and the entire distribution shape can be circular, rectangular or other geometric shapes. And the distribution area of ​​the sound receiving micro holes 11 can be the entire sound receiving surface.

[0037] Furthermore, a gasket 26 is disposed between the diaphragm 21 and the back electrode 22 .

[0038] Specifically, the gasket 26 mainly functions to separate the diaphragm 21 from the back electrode 22 to avoid direct contact between the two. As a preferred solution of the present invention, the gasket 26 is made of insulating material.

[0039] Furthermore, a copper ring 27 is provided between the back electrode 22 and the PCB board 23 .

[0040] Specifically, in the entire equivalent capacitor, the diaphragm 21 is electrically connected to the PCB board 23 through the housing 1 (metal material), and the two back electrodes 22 are electrically connected to the PCB board 23 through the copper ring 27 .

[0041] Furthermore, a circular boss is provided on one side of the diaphragm 21 close to the sound receiving micro hole 11.

[0042] Specifically, during actual use, the diaphragm 21 will vibrate due to the transmission of external sound wave energy. The design of the annular boss can prevent the diaphragm 21 from being in close contact with the sound receiving surface, leaving a margin for the vibration of the diaphragm 21.

[0043] Furthermore, a field effect device 25 is disposed on the surface of the PCB board 23 , and the field effect device 25 is electrically connected to the equivalent capacitor.

[0044] Specifically, since the capacitance of the actual capacitor is very small, the output electrical signal is extremely weak, and the output impedance is extremely high, which can reach hundreds of megohms or more. The electrical signal can be converted into a digital signal through the field effector 25, thereby achieving the effect of signal amplification.

[0045] Further, a wire 3 is provided on one side of the PCB board 23 away from the field effector 25, and the wire 3 is electrically connected to the field effector 25 through the PCB board 23. Specifically, other electronic components can be connected through the wire 3.

[0046] Furthermore, an epoxy adhesive layer 24 is provided between the shell 1 and the PCB board 23. The epoxy adhesive layer 24 makes the PCB and the shell 1 airtight, thereby ensuring the airtightness of the entire structure. This can effectively prevent water droplets at the sound receiving microholes 11 from falling into the shell 1, thereby further improving the waterproofness of the entire device.

[0047] Furthermore, as a preferred solution of the present invention, the shell 1 is made of aluminum.

[0048] Embodiment 2

[0049] A condenser microphone comprises the microporous waterproof receiver structure described in the first embodiment.

[0050] In summary, the utility model introduces a micro-hole waterproof sound receiver structure and a condenser microphone. By opening a plurality of sound receiving micro-holes 11 on the sound receiving surface of the housing 1, the liquid can be fixed in the plurality of sound receiving micro-holes 11 by utilizing the surface tension of the liquid, thereby preventing the external liquid from entering the housing 1. Compared with the structure of installing a waterproof cloth on the surface of a larger sound receiving hole in the prior art, it can effectively play a waterproof role. Under normal circumstances, the waterproof airtight cavity is unobstructed, and since there is no waterproof film to block it, the sound receiving effect is more ideal and distortion is avoided.

[0051] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A microporous waterproof microphone structure, characterized in that: include: A housing, wherein a plurality of sound receiving micro holes are provided on the end surface of the top of the housing, and a plurality of the sound receiving micro holes are evenly distributed on the end surface of the top of the housing near the center position of the top of the housing; The sound receiving part is arranged inside the shell; the sound receiving part includes a diaphragm, a back electrode and a PCB board, the diaphragm is arranged on a side of the shell close to the sound receiving microhole, the PCB board is arranged on an end of the shell away from the sound receiving microhole, the back electrode is arranged between the PCB board and the diaphragm, and the back electrode is electrically connected to the PCB board; an equivalent capacitor is formed between the diaphragm and the back electrode plate.

2. The microporous waterproof microphone structure according to claim 1, characterized in that: The diameter of the sound receiving microhole is 0.001mm-0.014mm.

3. The microporous waterproof microphone structure according to claim 1, characterized in that: The distance between any two adjacent sound receiving micro holes is 0.01mm-0.1mm.

4. The microporous waterproof microphone structure according to claim 1, characterized in that: A ring-shaped boss is arranged on one side of the diaphragm close to the sound receiving micro-hole.

5. The microporous waterproof microphone structure according to claim 1, characterized in that: A gasket is arranged between the diaphragm and the back electrode.

6. The microporous waterproof microphone structure according to claim 1, characterized in that: A copper ring is arranged between the back electrode and the PCB board.

7. The microporous waterproof microphone structure according to claim 1, characterized in that: A field effector is arranged on the surface of the PCB board, and the field effector is electrically connected to the equivalent capacitor.

8. The microporous waterproof sound receiver structure according to claim 7, characterized in that: A wire is arranged on one side of the PCB away from the field effector, and the wire is electrically connected to the field effector through the PCB.

9. The microporous waterproof microphone structure according to claim 1, characterized in that: An epoxy adhesive layer is arranged between the shell and the PCB board.

10. A condenser microphone, characterized in that: It comprises a microporous waterproof microphone structure as described in any one of claims 1 to 9.

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