Method and apparatus for providing backlighting for keypads and

Details Method and apparatus for providing backlighting for keypads and Method and apparatus for providing backlighting for keypads and

1996-12-10

1998-01-13

Hofsass, Jeffery

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

34081545, 34082582, 200314, 379368, H03K 1794

Patent

active

057084289

ABSTRACT:
Light-emitting diodes are embedded, preferably by insert molding, directly into the translucent elastomeric material forming a keypad or surrounding structure adjacent the light guide of a liquid crystal display panel. The electrical contacts of the LEDs are maintained in bias contact with contact pads provided on the secondary surface of a printed circuit board. The bias contact is preferably provided by a cover assembly which provides a compressive force against the elastomeric keypad when assembled with the printed circuit board and keypad. The present invention enables the construction of a printed circuit board having all of the electrical components disposed on only the primary side of the board, thereby permitting a simpler layout of the electrical circuitry on the PCB and the construction of a thinner keyboard assembly.

REFERENCES:
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patent: 5097396 (1992-03-01), Myers
patent: 5149923 (1992-09-01), Demeo
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patent: 5397867 (1995-03-01), Demeo
patent: 5401927 (1995-03-01), Lundell et al.
patent: 5432684 (1995-07-01), Fye et al.
patent: 5477430 (1995-12-01), LaRose
patent: 5510782 (1996-04-01), Norris et al.
patent: 5555550 (1996-09-01), Kaschke

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