Manufacturing method of electret condenser microphone

Abstract

The invention relates to a manufacturing method of an electret condenser microphone, which is as follows: a vibrating diaphragm electrode is manufactured; the vibrating diaphragm electrode is put in a shell; a gasket is put in the shell; a back electrode and an isolated body are put in the shell; the gasket is arranged between the vibrating diaphragm electrode and the back electrode, and the isolated body isolates the shell from the back electrode; adhesive is dispensed on the back electrode, namely conductive adhesive is dispensed; a circuit board assembly is installed in the shell and comprises a conductor post, a conversion chip and a circuit board, wherein the conductor post is installed in the middle of the circuit board, the conversion chip is installed on the circuit board, the back electrode is electrically connected with the back electrode through the conductive adhesive, and the circuit board assembly is electrically connected with the back electrode through the conductor post; and the edges of the shell are sealed. In the invention, the conductor post is used to replace a copper ring, and the conducting adhesive is dispensed on the back electrode to be connected with the conductor post. Because the surface area of the conductor post is small and the distance between the conductor post and the shell is large, a produced parasitic capacitance is relative small, thereby effectively improving the sensitivity of the electret condenser microphone.

Description

【Technical field】 [0001] The invention relates to a microphone, in particular to a manufacturing method of an electret condenser microphone. 【Background technique】 [0002] Microphones are miniature transducing devices that convert sound energy into electrical energy. According to different working principles, the microphones currently being developed are mainly divided into piezoelectric, piezoresistive and capacitive. [0003] The electret microphone is a condenser microphone made of electret material. There are two main structural forms: one is to use electret polymer film material as diaphragm; the other is to use electret material as rear plate. Because the electret itself is charged, this microphone does not need an external bulky polarization power supply, which simplifies the structure of the condenser microphone. Electret microphones have good electro-acoustic performance, strong anti-vibration ability, low price, and easy miniaturization, so they are widely used ...

AI Technical Summary

Problems solved by technology

[0005] However, due to the large surface area of ​​the part of the copper ring opposite to the shell and the small distance from the shell, a large parasitic capacitance is formed between the copper ring and the shell, which affects the sensitivity of the entire microphone

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