Piezoelectric electret microphone and piezoelectric electret film thereof

A piezoelectric electret and microphone technology, which is applied to electret electrostatic transducers, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve problems such as microphone failure and easy loss of charge
CN102938871AInactive Publication Date: 2013-02-20SHENZHEN HORN AUDIO
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHENZHEN HORN AUDIO
Publication Date
2013-02-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

A piezoelectric electret film comprises an input layer, a base material layer and a grounding layer, wherein the input layer is made of metal materials and used for feeding electrodes; the base material layer is made of porous polymer materials and treated in the electret mode, and charges are arranged in the base material layer; the grounding layer is made of metal materials and used for grounding; and the input layer, the base material layer and the grounding layer are laminated sequentially. When the piezoelectric electret film is applied to a microphone, the base material layer containing charges is not arranged on the surface of the piezoelectric electret film, so that even when the surface of the piezoelectric electret film is wet, the base material layer cannot be contacted with water directly, and the charges on the piezoelectric electret film can be effectively prevented from being lost. Simultaneously even when the surface of the base material layer is wet, the charges are stored in the base material layer, so that the charges cannot be directly contacted with the water, and further the charges can be prevented from being lost. The invention further provides a piezoelectric electret microphone using the piezoelectric electret film.
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Description

technical field

[0001] The invention relates to microphone equipment, in particular to a piezoelectric electret microphone and a piezoelectric electret film. Background technique

[0002] Electret condenser microphones have been widely used in various fields, such as mobile phones, notebooks, tablet computers, digital cameras, video cameras, game consoles, mp3 and mp4, etc. In the structure of the traditional electret condenser microphone, one pole of the capacitor is composed of a diaphragm combined with a metal ring and a film, and the other pole of the capacitor is composed of a metal back pole with an electret film. The metal back electrode is connected to the circuit board through a copper ring to form a rear cavity structure. Finally, it is sealed and packaged by crimping, and a net cloth is pasted on the sound inlet hole at the bottom of the shell to prevent dust and water.

[0003] Because in the traditional electret condenser microphone, the electret film that for...

Claims

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