Back-illuminated transparency contrast enhancement system

Details Back-illuminated transparency contrast enhancement system Back-illuminated transparency contrast enhancement system

1976-12-27

1977-11-22

Stephan, Steven L.

Radiant energy

Luminophor irradiation

With ultraviolet source

350 15, G01N 2138, G02B 2106

Patent

active

040597679

ABSTRACT:
A transparency is illuminated from the back or non-viewing side through an array of apertures with a light source which is invisible to the viewer. This light passes through the apertures and, after passing through the transparency, is reflected back through the transparency to the aperture structure. The region between apertures is a light converter surface which converts the invisible light to visible light. The visible light passes through the transparency to the viewer with the multiple passes providing contrast enhancement. An additional visible light source is used to provide adequate brightness in relatively dense areas of the transparency.

REFERENCES:
patent: 2152353 (1939-03-01), Lewin
patent: 3682531 (1972-08-01), Jeffers
patent: 4002914 (1977-01-01), Macovski

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