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Multi-zone capacitive force sensing device and methods

  • US 7,343,814 B2
  • Filed: 04/03/2006
  • Issued: 03/18/2008
  • Est. Priority Date: 04/03/2006
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a plurality of capacitors each having an upper conductive surface and a lower conductive surface substantially parallel to the upper conductive surface;

    a housing with a top plate and a bottom plate to encompass the plurality of capacitors;

    a sensor in the housing to generate a measurement based on a change in a distance between the upper conductive surface and the lower conductive surface of each of the plurality of capacitors when a contact zone of the top plate associated with the each of the plurality of capacitors is deflected by a force applied on the contact zone;

    a reference capacitor having an upper reference surface and a lower reference surface in the housing to compensate an error in the measurement based on an environmental condition; and

    at least one contact zone cavity formed on a bottom surface of the top plate, and wherein the upper conductive surface is formed on each of the at least one contact zone cavity.

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