Key switch with controllable illumination

Details Key switch with controllable illumination Key switch with controllable illumination

1987-02-10

1989-03-14

Yusko, Donald J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

200314, 200312, 341 23, 341 31, H01H 916

Patent

active

048128317

ABSTRACT:
An illuminated membrane keyboard 18 includes a light beam matrix, which when broken by the shadow of a stylus, operates logic to turn on illumination for a preset time rendering a normally dead front appearing keyboard visible. This feature conserves energy required to power illumination, lengthens the life of the illuminating source and limits access to the keyboard.

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patent: 4672364 (1987-06-01), Lucas
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