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Microphone for the transmission of body sounds

  • US 4,012,604 A
  • Filed: 06/17/1975
  • Issued: 03/15/1977
  • Est. Priority Date: 06/18/1974
  • Status: Expired due to Term
First Claim
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1. A microphone for the reception and conversion of low frequency sound, especially body sound signals, which can be used advantageously in conjunction with blood pressure measuring devices and the like, the microphone comprising in combination:

  • a cup-shaped microphone housing having a bottom and a generally tubular side wall with a rim defining an open upper end of the housing;

    a circular membrane covering the open end of the housing and having a narrow peripheral edge portion clamped against the rim of the side wall;

    a substantially flat flexural piezoelectric transducing wafer arranged inside the housing;

    means for mounting the transducing wafer above the housing bottom, a distance from the membrane, and in substantially parallel alignment with the latter, the mounting means holding the transducing wafer in a cantilever fashion so as to allowing a portion thereof to flex freely in displacement alignment with the center of the membrane; and

    a resiliently compressible transmitter body interposed between and engaging both the membrane and said flexing portion of the wafer, at least a portion of the transmitter body, including the extremity with which it is engaged against the wafer, being of a cellular, foamed material suited for the transmission of low frequency sound vibrations.

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