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Membrane touch switches

  • US 4,302,647 A
  • Filed: 04/04/1980
  • Issued: 11/24/1981
  • Est. Priority Date: 04/04/1980
  • Status: Expired due to Term
First Claim
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1. A touch switch device comprising:

  • a planar substrate member,a spacer sheet superimposed on said substrate member and having an aperture defining a recess which has a depth substantially equal to the thickness of the sheet,a deflectable membrane having a nominally top surface and a nominally bottom surface superimposed over said sheet and extending over said recess, said membrane having first thin short circuiting switch contact means on its top surface aligned with said recess,a rigid insulating member having its nominally bottom surface superimposed on said top surface of the membrane and having thin spaced apart switch contact elements on its bottom surface aligned with and normally in contact with said contact on the top surface of the membrane, said rigid insulating member having an aperture aligned with said recess, andplunger means for extending into said aperture in the insulating member and being movable to deflect said membrane in the vicinity of said recess to cause said contact on the membrane to separate from the contact elements on said insulating member.

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