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Capacitive transducer

  • US 6,006,386 A
  • Filed: 04/30/1998
  • Issued: 12/28/1999
  • Est. Priority Date: 11/16/1995
  • Status: Expired due to Fees
First Claim
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1. A capacitance transducer comprising:

  • a first electrode;

    a second electrode, said second electrode comprising a dielectric plate including a plurality of separate electrodes thereon, said separate electrodes consisting of a plurality of transversely-spaced-apart, longitudinally-extending strips of electrically-conducting material, wherein said first electrode and said second electrode have overlapping surface areas;

    a plurality of transversely-spaced-apart, longitudinally-extending first solid dielectric strips which are disposed between said first electrode and said second electrode; and

    a second fluid dielectric which is also disposed between said first electrode and said second electrode;

    said first electrode and said second electrode being so-oriented that increasing force which is applied to said transducer resiliently presses an increasing portion of said overlapping surface areas of said first electrode and said second electrode into close proximity, but which are separated by said first solid dielectric strips, while substantially-simultaneously removing said second fluid dielectric from areas of close proximity, thereby to cause a capacitance response that depends significantly on the size of areas which are pressed together relative to any capacitance response resulting from a change in the spacing of said first electrode and said second electrode.

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