Illuminated keyboard

Details Illuminated keyboard Illuminated keyboard

1977-11-15

1979-12-04

Nelson, Peter A.

Illumination

Illuminated scale or dial

Edge illuminated modifier or light rod/pipe

362 28, 362 30, 362 31, 362 32, G01D 1128

Patent

active

041775015

ABSTRACT:
An illuminating arrangement utilizes a sheet-type light-pipe. Light is reflected upwardly to the areas to be illuminated by providing the light-pipe with selectively roughened portions on its rear surface. When utilized to illuminate instruments such as calculators, surface areas of the calculator such as the pushbuttons and associated graphics receive light from the light-pipe by providing apertures in the keyboard which correspond positionally to the roughened portions of the sheet-type light-pipe. Additionally, the pushbuttons can be retained within the frame of the calculator by providing flanges extending laterally from the pushbuttons which are retained within apertures in a frame-like cover by retaining elements which extend from the cover inwardly into the openings.

REFERENCES:
patent: 2831453 (1958-04-01), Hardesty
patent: 3491245 (1970-01-01), Hardesty
patent: 3619591 (1971-11-01), Korski
patent: 3619594 (1971-11-01), Morez
patent: 3752974 (1973-08-01), Baker et al.
patent: 3886544 (1975-04-01), Narodny
patent: 3892959 (1975-07-01), Pulles
patent: 3956745 (1976-05-01), Ellis

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