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US 2002/0172385 A1Published application
Electret microphone
AssigneeCitizen Electronics Co., Ltd.
InventorsHaruhisa Tanabe, Koji Takayama
Life of this patent
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Abstract
An electret microphone comprises a back plate having a stationary back electrode and secured to a substrate. An electret layer is formed on the stationary back electrode and a spacer is mounted on the back plate. A diaphragm electrode is mounted on the spacer.
Claims5
An electret microphone comprising:
- a substrate having a circuit;
- a back plate having a stationary back electrode and secured to the substrate;
- an electret layer formed on the stationary back electrode;
- a spacer mounted on the back plate;
- a diaphragm electrode on the spacer;
- and
- a frame mounted on the diaphragm electrode.
4 more elements
Dependencies are inferred from the claim text.