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Condenser microphone, microphone unit, and blood pressure gauge

  • US 20080089527A1
  • Filed: 10/16/2007
  • Published: 04/17/2008
  • Est. Priority Date: 10/16/2006
  • Status: Active Grant
First Claim
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1. :

  • A condenser microphone in which a diaphragm and a backplate are disposed as two opposing electrodes inside a housing having an opening for admitting sound waves in a front surface, whereinan aeration hole is formed in a wall portion that blocks off a back surface of said housing; and

    a sound-absorbing filter having sound absorption characteristics with respect to a frequency band targeted for detection is disposed so as to cover said opening or aeration hole in one of the front surface or back surface of said housing.

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