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Interdigital force switches and sensors

  • US 7,509,881 B2
  • Filed: 07/29/2005
  • Issued: 03/31/2009
  • Est. Priority Date: 07/29/2005
  • Status: Expired due to Fees
First Claim
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1. An interdigital electronic device comprising:

  • (a) a conductor;

    (b) an interdigital electrode; and

    (c) a composite material disposed between the conductor and the interdigital electrode for electrically connecting the conductor and the interdigital electrode under application of sufficient pressure therebetween,the composite material comprising conductive particles at least partially embedded in an electrically insulating layer;

    the conductive particles having no relative orientation and being disposed so that substantially all electrical connections made between the conductor and the interdigital electrode are in the z direction, andthe electrically insulating layer comprising an elastomeric material that has a substantially constant G′

    between about 0°

    C. and about 100°

    C. and being capable of returning to substantially its original dimensions on the release of pressure;

    wherein at least one of the conductor and the interdigital electrode is movable toward the other; and

    wherein the device is a force sensor.

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