Key board switch unit with illumination

Details Key board switch unit with illumination Key board switch unit with illumination

1980-12-01

1982-08-10

Shepperd, John W.

Electricity: circuit makers and breakers

Electric switch details

Indicators

200159B, 200310, 200317, 362 31, H01H 918

Patent

active

043439756

ABSTRACT:
The invention provides a novel key board switch unit with illumination in the pushing areas, e.g. push buttons. Different from conventional ones, the pushing areas in the inventive unit are illuminated indirectly with the light emitted from a lamp positioned at a remote place not directly visible from above the pushing areas and, instead, an optical conductor member made of a transparent material is provided between the lamp and the pushing areas to be illuminated. The inventive key board switch unit can be very compactly designed despite the sufficiently high but not glaring intensity of illumination facilitating the operation of the switches even in a dark place.

REFERENCES:
patent: 2886911 (1959-05-01), Hardesty
patent: 3144643 (1964-08-01), Andersson
patent: 3619591 (1971-11-01), Korski
patent: 4022993 (1977-05-01), Shattuck
patent: 4060703 (1977-11-01), Everett
patent: 4163883 (1979-08-01), Boulanger
patent: 4247747 (1981-01-01), Swatten
patent: 4302648 (1981-11-01), Sado et al.

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