Photographic color copying apparatus and exposure control proces

Details Photographic color copying apparatus and exposure control proces Photographic color copying apparatus and exposure control proces

1990-09-28

1992-05-19

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 77, G03B 2780

Patent

active

051152703

ABSTRACT:
A photographic color copying apparatus and an exposure control process includes measuring filters variable as a function of the spectral sensitivities of different copy materials, in particular electro-optical filters. The variable measuring filters are constructed in the manner of Solc filters or Lyot-Ohman filters and include polarizers and electro-optical crystals, preferably liquid crystals.

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"Electro-Optically Tuned Spectral Filters: A Review", Optical Engineering, Nov./Dec. 1981, vol. 20, No. 6, pp. 837-845.
"Electrically Turnable Narrowband Optical Filter", Electronics Letters, Sep. 18, 1975, vol. 11, No. 19.

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