×

Polymeric piezoelectric key actuated device

  • US 3,940,637 A
  • Filed: 04/24/1974
  • Issued: 02/24/1976
  • Est. Priority Date: 10/15/1973
  • Status: Expired due to Term
First Claim
Patent Images

1. A electrically non-contact key input device comprising a piezoelectric polymer film having layer electrodes on both surfaces thereof, and means for straining said film so that said film is extended or contracted along the surface of said film, said straining means defining a key, said straining means comprising a snap action elastic plate with an upwardly convex surface, said film being adhered to said plate in such a manner that said film is contracted along the surface thereof together with said snap action plate upon downward depression.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×