Illuminated panels

Details Illuminated panels Illuminated panels

1979-03-07

1981-01-27

Shepperd, John W.

Electricity: circuit makers and breakers

Electric switch details

Indicators

200159B, 200317, H01H 918, H01H 1350

Patent

active

042477476

ABSTRACT:
A self-illuminating panel in which characters are unobtrusively illuminated by projection of light into a narrow face of a transparent flexible lamina marked with the characters. Each character, which may be a translucent printed figure, provides an optical discontinuity which disperses the light so that the diffusely illuminated character can be viewed in contrast against a dark background behind the lamina. Pressure applied on and through the flexible lamina enables operation of an array of switches disposed behind the lamina.

REFERENCES:
patent: 2648305 (1953-08-01), Appleman
patent: 2839670 (1958-06-01), Cladstone
patent: 3027669 (1962-04-01), Hardesty
patent: 3321616 (1967-05-01), Adler
patent: 3862381 (1975-01-01), Glaister et al.
patent: 4060703 (1971-11-01), Everett
patent: 4158115 (1979-06-01), Parkinson et al.
patent: 4163138 (1979-07-01), Harden

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