Condenser microphone unit
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United States of America Patent
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Jun 27, 2017
Grant Date -
Dec 10, 2015
app pub date -
May 28, 2015
filing date -
Jun 4, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
In a primary sound pressure-gradient type condenser microphone unit driving a diaphragm by difference in sound pressure applied to acoustic terminals in front and back of the diaphragm, a drive force of the diaphragm and sound collection characteristics in a high frequency band are easily adjusted. The condenser microphone unit includes a first pipe extending forward on the front side of a diaphragm and a second pipe arranged so as to surround the first pipe. A front acoustic terminal communicating with a front surface of the diaphragm is formed on an inner side of either one of the first pipe or the second pipe. A rear acoustic terminal communicating with a back surface of the diaphragm from the rear side of a fixed electrode is formed on an inner side of the other pipe.
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