Electret condenser microphone

Details Electret condenser microphone Electret condenser microphone

H - Electricity

04

R

349/66

H04R 17/02 (2006.01) H04R 19/01 (2006.01)

Patent

CA 2001724

An electret condenser microphone includes a cup- shaped metallic case having an apertured end wall, a tubular metal ring received in the metallic case, a vibratory dia- phragm having on its one surface a deposited metal film and bonded to an end face of the tubular metal ring in confront- ing relation to the end wall with an air gap defined there- between, and a condenser composed of a movable electrode and a fixed counter electrode, the fixed counter electrode comprising at least a part of the end wall of the metallic case while the movable electrode comprises the vibratory diaphragm. Partly because the end wall of the metallic case serves as the fixed electrode, and partly because the vibra- tory diaphragm is bonded to the end face of the metal ring, the number of the components of the microphone is relatively small. With this small number of components, the microphone is simple in construction and can be manufactured at a low cost, and further has a relatively large rear cavity behind the vibratory diaphragm, which improves the sensitivity of the microphone.

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