Transparency contrast enhancement system using a planar ultravio

Details Transparency contrast enhancement system using a planar ultravio Transparency contrast enhancement system using a planar ultravio

1980-10-17

1982-10-26

Smith, Alfred E.

Radiant energy

Luminophor irradiation

With ultraviolet source

350399, G01N 2164

Patent

active

043563996

ABSTRACT:
A transparency is illuminated from the viewing side with a transparent planar structure producing ultraviolet light. A phosphorescent screen on the non-viewing side of the transparency produces visible light in response to the ultraviolet light to enhance the contrast. Back-illumination is used to provide adequate brightness in relatively dark areas.

REFERENCES:
patent: 2152353 (1939-03-01), Lewin
patent: 2933602 (1960-04-01), Gillson, Jr.
patent: 2996617 (1961-08-01), Heckscher
patent: 4002914 (1977-01-01), Macovski

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