Microphone

Abstract

The invention discloses a microphone, which comprises an external package structure consisting of a shell and a circuit board. A parallel plate capacitor which consists of a membrane, a gasket and a polar plate is arranged in the package structure and installed on the bottom of the shell; a first cavity is formed between the membrane and the bottom of the shell; a metal ring and an insulating cavity sleeved on the periphery of the metal ring are arranged between the parallel plate capacitor and the circuit board; the two ends of the parallel plate capacitor are respectively electrically connected to the circuit board through the metal ring and the shell; acoustic holes are formed in the circuit board; a second cavity is formed between the insulating cavity and the side wall of the shell; and the first cavity and the second cavity are communicated. By arranging the acoustic holes at different positions on the circuit board, the volume of a rear cavity of the microphone can be increased, the limiting sensitivity of a product is improved, and electric performance required by the product is realized.

Description

technical field [0001] The present invention relates to the technical field of acoustic-electric transducers, and more specifically, to a microphone. Background technique [0002] With the progress of society and the development of technology, in recent years, as the volume of electronic products such as mobile phones and notebook computers has been continuously reduced, people have higher and higher requirements for the performance of these portable electronic products, which also require matching electronic products. Parts continue to shrink in size, performance and consistency. In this context, as one of the important parts of the above-mentioned portable electronic products, many new products have been introduced in the field of microphone products, among which the omni-directional back pole microphone is the representative product. [0003] For the working principle of ordinary omnidirectional back pole microphone products, as attached figure 1 It is a cross-sectional...

AI Technical Summary

Problems solved by technology

[0003] For the working principle of ordinary omnidirectional back pole microphone products, as attached figure 1 It is a cross-sectional view of a conventional omnidirectional back-pole microphone product, which includes a shell 1 and a circuit board 2 to form an external package structure of the microphone. The circuit board 2 is provided with a sound hole 21, and the inside of the package structure is provided with a diaphragm 3, A parallel plate capacitor composed of a gasket 4 and a pole plate 5, the parallel plate capacitor is electrically connected to the circuit board 2 through the metal ring 6 inside the insulating cavity 7 and the shell 1, the pole plate 5 is provided with a pole plate hole 51, A first cavity 11 is formed between the diaphragm 3 and the bottom of the housing 1, and the first cavity 11 is the back cavity of the microphone. Due to this fixed structure, the volume of the back cavity of the microphone is limited, which limits The extreme sensitivity of the microphone limits the electrical performance requirements of the product

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