Display device

Card – picture – or sign exhibiting – Translucent mirrors with indicia

Patent

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Details

250211K, 272 8M, 40427, G09F 1312

Patent

active

041809319

ABSTRACT:
The display device includes a housing having a viewing opening, an angularly disposed light transmitting mirror dividing the housing into rear and front display compartments located at right angles to each other, and lamps for illuminating each of the display compartments. One of the lamps is sequentially and alternately brightened, while the other is simultaneously dimmed, by a control including a pair of photocells which control the electrical power to each of the lamps in response to the amount of light falling thereon, a light source adapted to emit light onto both of the photocells and an opaque disc which is interposed the light source and the photocells and is slowly rotated by a motor. The disc includes a window portion which is arranged to sequentially and alternately gradually vary the amount of light from the light source reaching each of the photocells during the rotational cycle of the disc.

REFERENCES:
patent: 1499400 (1924-07-01), Oswald
patent: 3171034 (1965-02-01), Tomasulo
patent: 3256013 (1966-06-01), Kelsey
patent: 3256014 (1966-06-01), Kelsey
patent: 3639769 (1972-02-01), Clark
patent: 3808721 (1974-05-01), Gersch
IBM Disclosure Bulletin Volume 17 #4 dated Sep. 1974; p. 989

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