Double-capacitor microphone
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United States of America Patent
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Issued Date -
Jul 3, 2003
app pub date -
Nov 20, 2002
filing date -
Mar 7, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A capacitive microphone for generating an output signal which is a function of a capacitance between a moveable electrode and a fixed electrode separated by at least one layer disposed therebetween, wherein the at least one layer includes at least one spacer layer formed from one or more sheets of material. Since the moveable electrode is disposed between the first and second fixed electrodes, the microphone is equivalent to two variable capacitors in parallel. The first and second capacitances are preferably combined together to maximise the output signal, and thus also the sensitivity of the microphone. This electrode structure may therefore provide a microphone which has a greater sensitivity than a microphone with only one fixed electrode.
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