Adjustable photographic device

Details Adjustable photographic device Adjustable photographic device

1987-06-11

1990-02-13

Arnold, Bruce Y.

350314, 354483, G02B 2700, G03B 7099

Patent

active

049001310

ABSTRACT:
An adjustable photographic device includes a light transmission element for allowing light from an object to be photographed to pass therethrough, and light sources positioned around the periphery of the light transmission element for introducing light into the periphery of the light transmission element. This light introduced into the periphery of the light transmission element is internally reflected in the light transmission element causing the contrast of the photographed image to be controlled or modified without effecting the resolution thereof.

REFERENCES:
patent: 2900949 (1959-08-01), Baker
patent: 3123711 (1964-03-01), Fajans
patent: 4062628 (1977-12-01), Gale
patent: 4200379 (1980-04-01), Erlichman
patent: 4441798 (1984-04-01), Watanabe et al.
patent: 4648690 (1987-03-01), Ohe
patent: 4664481 (1987-05-01), Ito et al.
IBM Technical Disclosure Bulletin, vol. 14, No. 1, Jun. 1971, p. 223.

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