Exposure system

Details Exposure system Exposure system

1975-09-26

1976-12-07

Adams, Jr., Russell E.

Photocopying

Projection printing and copying cameras

Illumination systems or details

350160LC, 354227, 355 8, 355 67, G03B 2776

Patent

active

039959546

ABSTRACT:
Imaging apparatus, in which an original is subjected to reflex imaging, is provided with exposure control for selectively varying the angle of incidence upon a platen of a predetermined amount of light emanating from a light source. Exposure control is provided by an electrooptic cell comprising a layer of liquid crystalline composition between two electrodes and having a reflecting surface. The exposure system of the present invention is particularly suited for use in automatic copying machines having compact scanning apparatus.

REFERENCES:
patent: 3521954 (1970-07-01), French
patent: 3722998 (1973-03-01), Morse
patent: 3758207 (1973-09-01), Letzer
patent: 3764211 (1973-10-01), Morse et al.
patent: 3926520 (1975-12-01), Kaufman

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