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Touch and pressure sensing method and apparatus

  • US 6,002,389 A
  • Filed: 09/23/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 04/24/1996
  • Status: Expired due to Term
First Claim
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1. A touchpad comprising:

  • a conductive reference layer;

    a matrix of conductive traces;

    an insulating layer mounted between said reference layer and said matrix, said insulating layer and one of said reference layer and said matrix being displaceable in response to applied pressure to vary a distance between said reference layer and said matrix; and

    a capacitance measuring circuit connected between said matrix and said reference layer;

    wherein said reference layer is flexible and said matrix is rigid.

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