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Force transducer etched from silicon

  • US 5,045,152 A
  • Filed: 06/29/1990
  • Issued: 09/03/1991
  • Est. Priority Date: 03/06/1989
  • Status: Expired due to Term
First Claim
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1. A method for fabricating an accelerometer from silicon, comprising the steps of:

  • etching a pair of cavities through a silicon substrate from an exposed surface of said silicon substrate to define a first suspended beam therebetween, said first suspended beam being deflectable in response to acceleration;

    forming a first conductive portion on said first suspended beam;

    bonding a silicon based material to an opposite surface of said silicon substrate;

    etching a pair of cavities through said silicon based material bonded to said substrate to define a second suspended beam suspended opposite said first suspended beam;

    forming second and third conductive portions on said second suspended beam opposite said first conductive portion;

    coupling an electrical oscillator circuit between said first and second conductive portions for oscillating said second suspended beam; and

    coupling an electrical detector circuit between said first and third conductive portions for sampling electrical power between said first and third conductive portions at sample times provided by said oscillation of said second beam.

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