Light box having a Fresnel lens

Details Light box having a Fresnel lens Light box having a Fresnel lens

1986-07-30

1987-11-03

Miller, Stanley D.

350339R, G02F 113

Patent

active

047040041

ABSTRACT:
A light box comprises a source of light, a reflector and a Fresnel lens. The lens provides nearly constant illumination of an object such as a liquid crystal cell by collimating light parallel to a normal to the cell. Thus the cell will exhibit a nearly uniform electro-optical response. The reflector preferably is parabolic, while the light source preferably is a line source such as a fluorescent tube.

REFERENCES:
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patent: 1393573 (1921-10-01), Ritter
patent: 3653138 (1972-04-01), Cooper
patent: 3840695 (1974-10-01), Fischer
patent: 4171874 (1979-10-01), Bigelow et al.
patent: 4185895 (1980-01-01), Stephens et al.
patent: 4330813 (1982-05-01), Deutsch
patent: 4334734 (1982-06-01), Hareng et al.
patent: 4487481 (1984-12-01), Suzawa
patent: 4502761 (1985-03-01), Knoll et al.

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