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Electret capacitor microphone

  • US 6,594,369 B1
  • Filed: 08/11/2000
  • Issued: 07/15/2003
  • Est. Priority Date: 08/11/1999
  • Status: Expired due to Fees
First Claim
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1. An electret capacitor microphone comprising:

  • a surface conductive diaphragm;

    a fixed electrode provided opposite to the diaphragm at a fixed interval; and

    a solid state device for converting a change in an electrostatic capacity between the diaphragm and the fixed electrode induced by a sound signal given to the diaphragm into an electric signal, wherein the electret capacitor microphone is provided with a dielectric casing defining a bottomed hollow portion for accommodating the diaphragm, the fixed electrode and the solid state device, and wherein a conductive path is applied to an outer surface of the dielectric casing, an upper surface of an opening of the dielectric casing is metallized, a spacer in contact with the diaphragm is provided on an inner surface, and the upper surface of the opening is bonded to a metal cover with a conductive adhesive, thereby electrically connecting the diaphragm and the conductive path.

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