Photographic printer utilizing a photoactivated liquid-crystal l

Details Photographic printer utilizing a photoactivated liquid-crystal l Photographic printer utilizing a photoactivated liquid-crystal l

1996-02-28

1998-09-08

Moses, R. L.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 60, 355 66, 348743, 348761, 348766, 349 1, 349 2, 349 3, G03B 2780, G03B 2752, G03B 2770

Patent

active

058052747

ABSTRACT:
A photographic printer has a lamp which projects light through a cut-off filter, a filter unit, and a diffusion plate. The light travels further through a film negative, an objective lens, and to a polarizing beam splitter. The beam splitter provides the light to a spatial light modulator and to an exposing/enlarging lens. The spatial light modulator includes a light modulating layer of a homeotropically oriented nematic liquid crystal having a negative dielectric anisotropy. Layers of transparent electrodes in the spatial light modulator are provided with a predetermined voltage of a predetermined frequency. A write CRT, controlled by a controller and control unit, provides light to the spatial light modulator so that the light from the beam splitter can be modulated with an appropriate correction. The modulated light and the light from the beam splitter are made incident on a photographic color paper. The photographic printer has improved compensation for blur caused by dust on the optical path. Each pixel or minute region is controlled for reflectance.

REFERENCES:
patent: 5036353 (1991-07-01), Sakamoto
patent: 5235437 (1993-08-01), Katagiri et al.
patent: 5327263 (1994-07-01), Katagiri et al.
patent: 5430523 (1995-07-01), Tanibata
patent: 5657395 (1997-08-01), Hirota
"Liquid Crystals--Applications", Chapter 10: Photoconductive Crystal Displays, Okano and Kobayashi, 1985, pp. 223-229 (Baifukan).

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