Electret condenser microphone
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United States of America Patent
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Nov 19, 2013
Grant Date -
Nov 17, 2011
app pub date -
May 9, 2011
filing date -
May 11, 2010
priority date (Note) -
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Abstract
An electret condenser microphone includes a microphone capsule having a diaphragm, a fixed electrode and an extraction electrode. The extraction electrode includes a closed-bottomed cylinder composed of a conductive material. The fixed electrode has holes extending from an air chamber between the diaphragm and the fixed electrode to an air chamber within the extraction electrode, and is fixed to a shoulder of the extraction electrode to form the air chamber that serves as acoustic capacitor within the extraction electrode.
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