Front-cavity electret condenser microphone

Abstract

The utility model discloses a front cavity type electret condenser microphone, which relates to the technical field of microphones, and comprises a shell with one open end, a circuit board is arranged at the open end of the shell, a sound hole is arranged at the closed end of the shell, an annular gasket is arranged on the inner side of the closed end of the shell, a pole film is arranged on the gasket, and the pole film is arranged on the outer side of the shell. A membrane ring is arranged on the pole membrane, the circuit board is located above the membrane ring, and the pole membrane is electrically connected with the circuit board through the membrane ring. The front cavity type electret condenser microphone provided by the utility model solves the technical problems of complex structure, narrow frequency response and the like of an electret microphone in the prior art, and is simple in structure, wide in frequency response, less in material consumption and more suitable for large-scale automatic production.

Description

Technical Field

[0001] The utility model relates to the technical field of microphones, in particular to a front cavity type electret condenser microphone. Background Art

[0002] Electret microphones are widely used in various electronic products due to their stable performance, low distortion, and small size. However, existing electret microphones have narrow frequency response, complex structure, numerous parts, and high material consumption, making assembly difficult and production cost high. They are also not suitable for mass automated production and have low production efficiency. Utility Model Content

[0003] In view of the above defects, the purpose of the utility model is to provide a front-cavity electret condenser microphone, which has a simple structure, a wide frequency response, and uses less materials, and is more suitable for mass automated production.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] A front cavity type electret condenser microphone comprises a shell with one end open, a circuit board is arranged at the open end of the shell, a sound hole is arranged at the closed end of the shell, an annular gasket is arranged on the inner side of the closed end of the shell, a pole film is arranged on the gasket, a membrane ring is arranged on the pole film, the circuit board is located above the membrane ring, and the pole film is electrically connected to the circuit board through the membrane ring.

[0006] The membrane ring comprises an annular body made of conductive metal, and the outer side of the annular body is coated with an insulating ceramic layer.

[0007] Wherein, the polar membrane comprises an FEP diaphragm, and one side of the FEP diaphragm is covered with a nickel-plated layer.

[0008] Wherein, the pole membrane and the membrane ring are fixed as a whole.

[0009] Wherein, the pole membrane and the membrane ring are bonded and fixed as a whole.

[0010] Wherein, the side of the pole membrane covered with the nickel-plated layer is bonded to the membrane ring.

[0011] Wherein, the outer side of the closed end of the shell is covered with a dustproof sheet.

[0012] Wherein, a signal amplifying circuit composed of a plurality of components is provided on one side of the circuit board located inside the shell.

[0013] Wherein, a soldering pad electrically connected to the signal amplifying circuit is provided on one side of the circuit board outside the housing.

[0014] Wherein, the insulating ceramic layer is coated on the outer side of the annular body by an electrolytic process.

[0015] After adopting the above technical solution, the beneficial effects of the utility model are:

[0016] Since the front cavity type electret condenser microphone of the utility model comprises a shell with an open end, a circuit board is arranged at the open end of the shell, a sound hole is arranged at the closed end of the shell, a ring-shaped gasket is arranged on the inner side of the closed end of the shell, a polar membrane is arranged on the gasket, a membrane ring is arranged on the polar membrane, the circuit board is located above the membrane ring, and the polar membrane is electrically connected to the circuit board through the membrane ring, the utility model has a simple structure, uses less materials, is easy to assemble, has a wide frequency response, has a low production cost, and is more suitable for mass automated production.

[0017] In summary, the front-cavity electret condenser microphone of the present invention solves the technical problems of the electret microphone in the prior art, such as complex structure and narrow frequency response. The front-cavity electret condenser microphone of the present invention has a simple structure, a wide frequency response, and uses less materials, and is more suitable for mass automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the exploded structure of the front cavity type electret condenser microphone of the utility model;

[0019] Figure 2 It is a schematic diagram of the internal structure of the front cavity type electret condenser microphone of the utility model;

[0020] Figure 3 It is a frequency response curve diagram of the front cavity type electret condenser microphone of the utility model;

[0021] In the figure: 10, circuit board, 12, solder pad, 14, components, 20, membrane ring, 30, pole membrane, 40, gasket, 50, housing, 52, sound hole, 60, dustproof sheet. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] The directions mentioned in this specification are based on the directions shown in the drawings and only represent relative positions, not absolute positions.

[0024] like Figure 1 and Figure 2As shown together, a front cavity type electret condenser microphone includes a housing 50 with an open end, a circuit board 10 is arranged at the open end of the housing 50, and the edge of the open end of the housing 50 is bent inwardly and pressed against the outside of the circuit board 10, so that the circuit board 10 is constrained in the housing 50. The housing 50 and the circuit board 10 together form a closed microphone package shell. A gasket 40, a pole film 30 and a membrane ring 20 are arranged in the package between the housing 50 and the circuit board 10. A sound hole 52 is arranged at the closed end of the housing 50 to connect the inner cavity of the housing 50 with the outside.

[0025] like Figure 1 and Figure 2 As shown together, the gasket 40 is an annular structure, which is arranged on the inner side of the closed end of the outer shell 50, the pole membrane 30 is arranged on the gasket 40, the membrane ring 20 is arranged at the edge position of the upper side of the pole membrane 30, the circuit board 10 is located above the membrane ring 20, and the pole membrane 30 is electrically connected to the circuit board 10 through the membrane ring 20.

[0026] like Figure 1 and Figure 2 As shown together, the membrane ring 20 includes an annular body made of a conductive metal, and the outer side of the annular body is coated with an insulating ceramic layer. In this embodiment, the conductive metal is preferably aluminum or copper. These two metals have good electrical conductivity and are cheap, and are the preferred materials for this embodiment, but these two metals are not limited in practice. In this embodiment, the insulating ceramic layer is further preferably coated on the outer side of the annular body through an electrolytic process. The utility model combines the two components of the metal ring and the insulating ring in the prior art into one component by coating an insulating material on the outer side of the metal ring, thereby reducing the number of parts, which not only simplifies the structure of the microphone, but also makes the assembly process of the microphone simpler, which can improve the production efficiency of the microphone and reduce the production cost.

[0027] like Figure 1 and Figure 2 As shown together, the pole film 30 includes a FEP (Fluorinated ethylene propylene) film, and one side of the FEP film is covered with a nickel-plated layer. In this embodiment, the pole film 30 is preferably fixed to the film ring 20 as a whole, and further preferably, the pole film 30 is bonded and fixed to the film ring 20 as a whole, and the side of the pole film 30 covered with the nickel-plated layer is bonded to the film ring 20, so that the pole film 30 is electrically connected to the circuit board 10 through the film ring 20.

[0028] like Figure 1 and Figure 2As shown together, a signal amplifying circuit composed of several components 14 is provided on one side of the circuit board 10 located inside the housing 50, and a soldering pad 12 electrically connected to the signal amplifying circuit is provided on one side of the circuit board 10 located outside the housing 50. Sound waves enter the inner cavity of the housing 50 through the sound hole 52 and act on the pole film 30. The pole film 30 generates vibrations of different amplitudes according to the strength of the sound waves, thereby generating corresponding electrical signals. The electrical signals are processed and amplified by the amplifier circuit and then transmitted to the external circuit through the soldering pad 12. The frequency response of the front cavity electret condenser microphone of the utility model is wide, and its frequency response curve is shown in the figure below. Figure 3 shown.

[0029] like Figure 1 and Figure 2 As shown together, the outer side of the closed end of the housing 50 is covered with a dustproof sheet 60, which plays a dustproof role and can prevent external dust and impurities from entering the microphone through the sound hole 52, which is beneficial to ensuring the performance and service life of the microphone.

[0030] In summary, the front-cavity electret condenser microphone of the utility model has a simple structure, a wide frequency response, less materials, a simple assembly process, high production efficiency, low production cost, and is more suitable for mass automated production.

[0031] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work are all within the protection scope of the present invention.

Claims

1. A front cavity electret condenser microphone, characterized in that: The invention comprises a shell (50) with one end open, wherein a circuit board (10) is provided at the open end of the shell (50), a sound hole (52) is provided at the closed end of the shell (50), an annular gasket (40) is provided on the inner side of the closed end of the shell (50), a pole film (30) is provided on the gasket (40), a membrane ring (20) is provided on the pole film (30), the circuit board (10) is located above the membrane ring (20), and the pole film (30) is electrically connected to the circuit board (10) via the membrane ring (20).

2. The front cavity electret condenser microphone according to claim 1, characterized in that: The membrane ring (20) comprises an annular body made of conductive metal, the outer side of the annular body being coated with an insulating ceramic layer.

3. The front cavity electret condenser microphone according to claim 2, characterized in that: The polar membrane (30) comprises an FEP diaphragm, one side of which is covered with a nickel-plated layer.

4. The front cavity electret condenser microphone according to claim 3, characterized in that: The polar membrane (30) and the membrane ring (20) are fixed as a whole.

5. The front cavity type electret condenser microphone according to claim 4, characterized in that: The pole membrane (30) and the membrane ring (20) are bonded and fixed as a whole.

6. The front cavity type electret condenser microphone according to claim 5, characterized in that: The side of the pole membrane (30) covered with the nickel-plated layer is bonded to the membrane ring (20).

7. The front cavity electret condenser microphone according to claim 1, characterized in that: The outer side of the closed end of the housing (50) is covered with a dustproof sheet (60).

8. The front cavity electret condenser microphone according to claim 1, characterized in that: A signal amplification circuit composed of a plurality of components (14) is provided on one side of the circuit board (10) located inside the housing (50).

9. The front cavity type electret condenser microphone according to claim 8, characterized in that: A soldering pad (12) electrically connected to the signal amplifying circuit is provided on one side of the circuit board (10) located outside the housing (50).

10. The front cavity electret condenser microphone according to claim 2, characterized in that: The insulating ceramic layer is coated on the outer side of the annular body by an electrolytic process.

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