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Pickup device for picking up vibration transmitted through bones

  • US 4,596,903 A
  • Filed: 04/27/1984
  • Issued: 06/24/1986
  • Est. Priority Date: 05/04/1983
  • Status: Expired due to Term
First Claim
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1. A pickup device for detecting auditory vibrations transmitted through bones or other rigid members in a human body, comprising:

  • a substantially rigid liquid-tight case having a cavity therein, a cantilever-like piezo-electric element having a first end fixed to said case so as to vibrate therewith when said case vibrates in response to auditory vibrations, and a free second end extending into said cavity; and

    a viscous liquid having a viscosity in the range 30 cs to 10,000 cs, filling said cavity so as to dampen resonant vibrations of said free end of said piezo-electric element;

    said piezo-electric element having a resonant frequency greater than 1.5 KHz and exhibiting a Q in said device less than 3.

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