Magnifying key switch

Details Magnifying key switch Magnifying key switch

1995-11-13

1997-06-03

Hofsass, Jeffery

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 20, 200311, 200314, 200341, H03K 1794

Patent

active

056359276

ABSTRACT:
A key switch includes a rubber key body mounted within a key switch hole on a key pad device above a circuit board thereof, and a key cap fastened to the rubber key body at the top and depressed to move the rubber key body downward in triggering a contact on the circuit board, wherein the key cap is made from a plastic convex lens having a convex top wall and a plain bottom wall, the plain bottom wall having a light-blocking area and a light-penetrable area, the light-penetrable area being shown in the form of a pattern; the rubber key body is molded from a vulcanized rubber sealed to the plain bottom wall of the key cap through a heat sealing process. Three layers of ink are disposed between the key body and the key cap.

REFERENCES:
patent: 4464326 (1984-08-01), Nishihara
patent: 4937408 (1990-06-01), Hattori et al.

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