Electret microphone
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United States of America Patent
Stats
-
Nov 25, 1980
Grant Date -
N/A
app pub date -
Feb 16, 1979
filing date -
Feb 20, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an electret microphone in which an impedance conversion element housing chamber for an impedance conversion element is provided on the side opposite from an electret diaphragm with respect to a back electrode in a capsule, an isolating metal plate is disposed in the impedance conversion element housing chamber in spaced relation to the back electrode to define between the isolating metal plate and the back electrode an air compartment which is pneumatically isolated from the impedance conversion element chamber.
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