Low-cost electret microphone

Abstract

The utility model relates to an electret microphone with low cost. The electret microphone comprises a shell, a gasket, a vibrating diaphragm, a copper ring and a circuit board, both the shell and the vibrating diaphragm comprise conductive materials, the gasket is an insulating material, the gasket is arranged between the shell and the vibrating diaphragm, and the copper ring is electrically connected with the vibrating diaphragm and the circuit board respectively; the shell, the vibrating diaphragm and the gasket are used for forming a capacitor; the vibrating diaphragm is used for generating vibration under the action of sound and generating a changing electric signal; the copper ring is used for transmitting the changed electric signal to the circuit board; and the circuit board is used for amplifying the changed electric signal. According to the electret microphone of the utility model, the vibrating diaphragm is directly used to complete vibration and acoustic-electric conversion, the material of the back pole plate is saved, and the manufacturing cost of the electret microphone is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of microphones, in particular to a low-cost electret microphone. Background Art

[0002] The traditional electret microphone includes a shell, which includes a diaphragm, a back plate, a copper ring and a circuit board in sequence. The back plate is connected to the circuit board through a copper ring, and a plastic ring is mounted on the outside of the back plate and the copper ring to fix the position of the back plate and the copper ring. After the sound hole on the shell receives the sound, it is transmitted to the circuit board through the diaphragm, the back plate and the copper ring for sound-to-electricity conversion.

[0003] The electret microphone has a simple structure, good electroacoustic performance, and a wide range of applications. With the development of technology, people's performance requirements for electret microphones are constantly increasing, which further leads to high production costs. Utility Model Content

[0004] Based on this, it is necessary to provide a low-cost electret microphone to address the problem of high production cost of electret microphones.

[0005] A low-cost electret microphone comprises a housing, a gasket, a diaphragm, a copper ring and a circuit board;

[0006] The housing and the diaphragm both contain conductive materials, the gasket is made of insulating material, the gasket is arranged between the housing and the diaphragm, and the copper ring is electrically connected to the diaphragm and the circuit board respectively;

[0007] The housing, the diaphragm and the gasket are used to form a capacitor;

[0008] The diaphragm is used to vibrate under the action of sound and generate a changing electrical signal;

[0009] The copper ring is used to transmit the changed electrical signal to the circuit board;

[0010] The circuit board is used for amplifying the changed electrical signal.

[0011] In one embodiment, the housing is cylindrical.

[0012] The above-mentioned low-cost electret microphone includes a housing, a gasket, a diaphragm, a copper ring and a circuit board; the housing and the diaphragm both contain conductive materials, the gasket is an insulating material, the gasket is arranged between the housing and the diaphragm, and the copper ring is electrically connected to the diaphragm and the circuit board respectively. A capacitor can be formed by the housing, the diaphragm and the gasket. The diaphragm can vibrate under the action of sound and generate a changing electrical signal. The copper ring can transmit the changing electrical signal to the circuit board, and the circuit board can amplify the changing electrical signal, thereby completing the sound-to-electric conversion process. It can be seen that the low-cost electret microphone can save back plate materials through the capacitor composed of the housing, the diaphragm and the gasket, thereby reducing manufacturing costs.

[0013] In one embodiment, the housing is cylindrical.

[0014] In one embodiment, a sound inlet hole is formed on a bottom surface of one side of the housing, and an opening for installing the circuit board is formed on a bottom surface of another side of the housing.

[0015] In one of the embodiments, a field effect transistor is provided on the circuit board, and the copper ring is electrically connected to the gate of the field effect transistor.

[0016] In one embodiment, the electret microphone further includes a plastic ring, which is sleeved on the outside of the copper ring and is used to prevent a short circuit between the copper ring and the housing.

[0017] In one embodiment, the gasket is annular.

[0018] In one embodiment, the copper ring is sleeved on the outside of the diaphragm.

[0019] In one embodiment, the diaphragm is circular.

[0020] In one embodiment, the diaphragm is in a ring shape.

[0021] In one embodiment, the low-cost electret microphone is cylindrical, with a bottom diameter of 6.0 mm and a height of 2.2 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional structural schematic diagram of the low-cost electret microphone of the utility model;

[0023] Among them, 10 is a housing, 20 is a gasket, 30 is a diaphragm, 40 is a copper ring, 50 is a circuit board, 60 is a plastic ring, and 11 is a sound inlet. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only."

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] The embodiment of the utility model discloses a low-cost electret microphone.

[0028] like Figure 1 As shown, the electret microphone includes a housing 10, a gasket 20, a diaphragm 30, a copper ring 40 and a circuit board 50. The housing 10 and the diaphragm 30 both contain conductive materials, the gasket 20 is an insulating material, the gasket 20 is arranged between the housing 10 and the diaphragm 30, and the copper ring 40 is electrically connected to the diaphragm 30 and the circuit board 50 respectively. The housing 10, the diaphragm 30 and the gasket 20 are used to form a capacitor; the diaphragm 30 is used to vibrate under the action of sound and generate a changed electrical signal; the copper ring 40 is used to transmit the changed electrical signal to the circuit board 50; the circuit board 50 is used to amplify the changed electrical signal.

[0029] The above-mentioned low-cost electret microphone includes a housing, a gasket, a diaphragm, a copper ring and a circuit board; the housing and the diaphragm both contain conductive materials, the gasket is an insulating material, the gasket is arranged between the housing and the diaphragm, and the copper ring is electrically connected to the diaphragm and the circuit board respectively. A capacitor can be formed by the housing, the diaphragm and the gasket. The diaphragm can vibrate under the action of sound and generate a changing electrical signal. The copper ring can transmit the changing electrical signal to the circuit board, and the circuit board can amplify the changing electrical signal, thereby completing the sound-to-electric conversion process. It can be seen that the low-cost electret microphone can save back plate materials through the capacitor composed of the housing, the diaphragm and the gasket, thereby reducing manufacturing costs.

[0030] The shape of the housing 10 can be designed according to actual conditions. Preferably, the housing 10 is cylindrical. A sound inlet 11 is provided on one side of the bottom surface of the housing 10, and an opening for installing the circuit board 50 is provided on the other side of the bottom surface. Through the sound inlet 11, external sound can be better transmitted to the inside of the housing 10, thereby improving the sensitivity of the diaphragm 30.

[0031] Among them, a field effect tube is provided on the circuit board 50, and the copper ring 40 is electrically connected to the gate of the field effect tube. The field effect tube can amplify the signal. Through the copper ring 40 being electrically connected to the gate of the field effect tube, the field effect tube can amplify the changing electrical signal received by the gate.

[0032] Furthermore, the electret microphone also includes a plastic ring 60 , which is sleeved on the outside of the copper ring 40 , and is used to prevent a short circuit between the copper ring 40 and the housing 10 .

[0033] The shape of the gasket 20 can be set according to actual needs. Preferably, the gasket 20 is annular.

[0034] The copper ring 40 is sleeved on the outside of the diaphragm 30. In the actual production process, the diaphragm 30, the copper ring 40 and the plastic ring 60 can be processed into a loop component.

[0035] The shape of the diaphragm 30 can be set according to actual conditions. For example, the diaphragm 30 can be circular, or the diaphragm 30 can be annular.

[0036] When assembling the low-cost electret microphone, the gasket 20 can be first assembled into the housing 10, and then the circuit assembly consisting of the diaphragm 30, the copper ring 40 and the plastic ring 60 can be assembled, and finally the circuit board can be assembled and the housing 10 can be sealed.

[0037] The shape and size of the low-cost electret microphone can be set according to actual conditions. Preferably, the low-cost electret microphone is cylindrical, with a bottom diameter of 6.0 mm and a height of 2.2 mm. The sizes of the housing 10, gasket 20, diaphragm 30, copper ring 40, circuit board 50 and plastic ring 60 of the low-cost electret microphone can be set according to actual needs.

[0038] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A low-cost electret microphone, characterized in that: Including housing, gasket, diaphragm, copper ring and circuit board; The housing and the diaphragm both contain conductive materials, the gasket is made of insulating material, the gasket is arranged between the housing and the diaphragm, and the copper ring is electrically connected to the diaphragm and the circuit board respectively; The housing, the diaphragm and the gasket are used to form a capacitor; The diaphragm is used to vibrate under the action of sound and generate a changing electrical signal; The copper ring is used to transmit the changed electrical signal to the circuit board; The circuit board is used for amplifying the changed electrical signal.

2. The low-cost electret microphone according to claim 1, characterized in that: The shell is cylindrical.

3. The low-cost electret microphone according to claim 2, characterized in that: A sound inlet hole is provided on one bottom surface of the housing, and an opening for installing the circuit board is provided on the other bottom surface.

4. The low-cost electret microphone according to claim 1, characterized in that: A field effect tube is arranged on the circuit board, and the copper ring is electrically connected to the grid of the field effect tube.

5. The low-cost electret microphone according to claim 1, characterized in that: It also includes a plastic ring, which is sleeved on the outside of the copper ring and is used to prevent a short circuit between the copper ring and the shell.

6. The low-cost electret microphone according to claim 1, characterized in that: The gasket is in the shape of a circular ring.

7. The low-cost electret microphone according to claim 1, characterized in that: The copper ring is sleeved on the outer side of the diaphragm.

8. The low-cost electret microphone according to claim 7, characterized in that: The diaphragm is circular.

9. The low-cost electret microphone according to claim 7, characterized in that: The diaphragm is in a circular shape.

10. The low-cost electret microphone according to claim 1, characterized in that: The low-cost electret microphone is cylindrical, with a bottom diameter of 6.0 mm and a height of 2.2 mm.

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