Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-08-26
1989-11-14
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340712, 341 31, G09G 100, G01V 904
Patent
active
048809691
ABSTRACT:
A programmable touch panel comprises an interactive control/display panel having the capability of entering and updating information to a host computer via a plurality of multifunction programmable keys. An optical switch is associated with each key for operator selection. Each key includes a light source mounted to a circuit board for sending a light beam through a hole in a heat sink toward a reflector that directs the beam across a touch panel. A second reflector then directs the beam through a second hole in the heat sink toward a detector mounted on the circuit board.
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Litton Systems Inc.
Westin Edward P.
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