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Switch device with operating modes of capacitive proximity and mechanical actuation

  • US 5,270,710 A
  • Filed: 11/27/1991
  • Issued: 12/14/1993
  • Est. Priority Date: 12/13/1990
  • Status: Expired due to Term
First Claim
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1. Switch device with two operating modes, namely:

  • a proximity sensing first operating mode and a direct mechanical action second operating mode, said device comprising at least one mechanical switch comprising at least one fixed contact member carried by a substrate and a mobile contact member adapted to be urged into contact with said fixed contact member, wherein at least one of said contact members is additionally employed as a sensing element of a capacitive proximity sensing device and comprises means for applying to said element an electrical signal and means for sensing variations in said signal due to the proximity of an electrically conductive object.

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