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Bounceless switch apparatus

  • US 4,315,238 A
  • Filed: 04/16/1980
  • Issued: 02/09/1982
  • Est. Priority Date: 09/24/1979
  • Status: Expired due to Term
First Claim
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1. A bounceless switch apparatus having a junction resistance which varies inversely with a pressure applied normally thereto, comprising:

  • a first conductor member;

    a pressure sensitive composition layer including a particulated semiconducting material disposed for covering the first conductor member in intimate electrically conducting contact therewith, the layer pressure sensitive composition layer having a first surface with a multiplicity of microprotrusions of the particulate semiconducting material extending from the first surface for providing a multiplicity of surface contact locations; and

    a second conductor member positioned in substantially nonelectrically conducting relationship to the pressure sensitive composition layer whereby the bounceless switch apparatus is normally open, the switch being closed in response to a pressing force applied to urge the second conductor member and the first surface together for increasing the physical contact between the microprotrusions and the second conductor, to enable electrical conduction through the contacting microprotrusions, the amount of electrical conduction increasing as the amount of pressing force is increased and decreasing as the amount of pressing force is decreased.

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