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MICROPHONE CONSTRUCTION

  • US 3,821,491 A
  • Filed: 05/15/1972
  • Issued: 06/28/1974
  • Est. Priority Date: 05/15/1972
  • Status: Expired due to Term
First Claim
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1. A microphone construction comprising:

  • an elongated conductive frame member;

    a plurality of non-moveable plate sections affixed to and insulated from said frame, each said plate section including a conductive surface facing away from said frame and having a multiplicity of distributed minute depressions therein;

    a plurality of thin moveable electret insulating film sections disposed on the conductive surfaces of said plate sections, each of said film sections having an outer conductive layer;

    means for coupling each of said outer conductive layers to said frame; and

    means for coupling the plate sections in series to a common output.

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