Polymeric piezoelectric key actuated device
First Claim
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.
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Abstract
A key input device which forms a key switch with high reliability or an integrated keyboard with small dimensions which can produce coded signals with high reliability and a S/N ratio of high value without any encoder circuits, comprising a piezoelectric polymer film, applied as a pressure sensor, having layer electrodes on both surfaces thereof and at least one device for straining the film, the straining device defining a key.
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Citations
7 Claims
- 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.
Specification