Liquid crystal optical printing apparatus with rod lens

Details Liquid crystal optical printing apparatus with rod lens Liquid crystal optical printing apparatus with rod lens

1982-12-23

1986-05-20

Corbin, John K.

Photocopying

Contact printing

Light boxes

350332, 355 1, 355 3R, 355 71, G02F 113, G02F 1137, G02B 2700, G02G 1500

Patent

active

045897328

ABSTRACT:
The optical printing apparatus comprises a fluorescent lamp light source, a shield plate for blocking substantially all of the light emitted from the light source, a liquid crystal panel subject to irradiation with the light emitted from the light source and passing through a slit in the shield plate. The liquid crystal panel includes a plurality of light valves. A driver is disposed on the outside of the shield plate for selectively opening and closing the light valves. Fibers disposed below the liquid crystal panel and functionally equivalent to a self-focusing lens direct incident light, which has passed through the light valves, onto a photosensitive drum and printing is completed in the conventional manner. The light source, slit, liquid crystal panel and fibers are arranged in a line. The temperature and brightness of the light source are precisely controlled with feedback circuits and the liquid crystal panel is temperature controlled.

REFERENCES:
patent: 2765458 (1956-10-01), Hoover
patent: 3036153 (1962-05-01), Day
patent: 3621138 (1971-11-01), McNaney
patent: 3622226 (1971-11-01), Matthies
patent: 3824604 (1974-07-01), Stein
patent: 3890041 (1975-06-01), Henkler
patent: 4057338 (1977-11-01), Yevick
patent: 4110794 (1978-08-01), Lester et al.
patent: 4194833 (1980-03-01), Lester et al.
patent: 4264130 (1981-04-01), Ogura
patent: 4272156 (1981-06-01), Ishibashi et al.
patent: 4297022 (1981-10-01), Lester
patent: 4364639 (1982-12-01), Sinclair et al.
patent: 4386836 (1983-06-01), Aoki

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