Indicator for displaying text or symbols on small surfaces

Details Indicator for displaying text or symbols on small surfaces Indicator for displaying text or symbols on small surfaces

1975-10-07

1977-05-31

Corbin, John K.

40130C, 350 96R, G02B 1704

Patent

active

040266354

ABSTRACT:
Indicator for displaying text or symbols on small surfaces readable under very large reading angles from the normal of the displaying surface and during strongly incident light. The indicator comprises a light-impervious casing, at least one incandescent lamp, a transparency and a light conducting insert in the shape of a prism having an exit surface for the light from the incandescent lamp or lamps, said light entering the prism at the side surface or surfaces opposite to the exit surface in direct connection with which the transparency is provided.

REFERENCES:
patent: 894509 (1908-07-01), Leupold
patent: 1461301 (1923-07-01), Wiskott
patent: 1732068 (1928-10-01), Schauder
patent: 2770712 (1956-11-01), Dros
patent: 3406475 (1968-10-01), O'Donnell

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