Photographic printer

Details Photographic printer Photographic printer

1991-06-25

1992-06-16

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Multicolor picture

G03B 2754, G03B 2772

Patent

active

051228319

ABSTRACT:
A photographic printer having a color liquid crystal panel disposed between a light source and a photographic film. The color liquid crystal panel adjusts the light intensity and color balance of the light from the light source. The color liquid crystal panel has a plurality of cells disposed in a matrix, each cell having a light valve whose light transmittance changes with the drive voltage applied to the cell and a color filter of one of the three primary colors. The color liquid crystal panel is used as light amount controlling means, a shutter, or as both of them. According to the preferred embodiment of the present invention, the light transmittance of each cell is individually adjusted to correct the exposure unevenness and/or adjust the gradation.

REFERENCES:
patent: 3761172 (1973-09-01), Letzer
patent: 4933754 (1990-06-01), Reed et al.
patent: 4989032 (1991-01-01), Hull et al.

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