Transparency contrast enhancement system

Details Transparency contrast enhancement system Transparency contrast enhancement system

1976-02-27

1977-01-11

Stephan, Steven L.

Radiant energy

Luminophor irradiation

With ultraviolet source

350158, 350159, G01N 2138, G02B 124, G02B 530, G02B 2728

Patent

active

040029140

ABSTRACT:
A transparency is illuminated from the viewing side with a light converter backing placed against the opposite side. The light reflected from the viewing surface of the transparency is rendered invisible to the viewer. A partially reflecting mirror is placed against the viewing side in regions of particularly low contrast to provide additional enhancement. Back illumination is used to provide adequate brightness in relatively dark areas.

REFERENCES:
patent: 2152353 (1939-03-01), Lewin
patent: 2168225 (1939-08-01), Lewin
patent: 2192295 (1940-03-01), Berek
patent: 3062087 (1962-11-01), Zandman et al.
patent: 3419984 (1969-01-01), Sakamoto
patent: 3567309 (1971-03-01), Jasgur
patent: 3682531 (1972-08-01), Jeffers

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