Capacitor microphone
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United States of America Patent
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Jul 30, 2013
Grant Date -
Jun 23, 2011
app pub date -
Nov 10, 2010
filing date -
Dec 22, 2009
priority date (Note) -
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Abstract
A capacitor microphone includes: a capacitor microphone unit including a diaphragm that vibrates upon receiving sound waves and a fixed electrode arranged opposite to the diaphragm with a space therebetween; and a polarization voltage generating circuit that generates polarization voltage to be applied across the diaphragm and the fixed electrode. The polarization voltage generating circuit includes an oscillating circuit that alternately turns on and off DC power, coils to boost the voltage of the power alternately turned on and off, and a DC boosting circuit including a rectifying circuit that rectifies the boosted voltage. The coils are formed of two inductors that are electromagnetically coupled and are provided with an electromagnetic coupling adjusting unit with which the level of electromagnetic coupling between the two inductors is adjusted to adjust the polarization voltage.
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