Method and apparatus for regulation of the amount of printing li

Details Method and apparatus for regulation of the amount of printing li Method and apparatus for regulation of the amount of printing li

1993-10-12

1994-11-15

Rutledge, D.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 77, G03B 2780

Patent

active

053653068

ABSTRACT:
According to a process for regulating the amount of copying light in a closed control loop of a photographic color photocopier equipped with color filters, the copying light influenced by the color filters is selectively measured in the primary colors, red, green and blue. A deviation resulting from the comparison of the real values with predeterminable set values is subdivided into a color deviation and a brightness deviation. The color deviation is compensated by regulating the color filters, whereas the brightness deviation is converted into a correction factor for the lighting time, so that for each primary color the product of the light intensity real value by the effective lighting time is constant and identical to the product of the light intensity set value by the lighting time set value.

REFERENCES:
patent: 4319834 (1982-03-01), Terrill
patent: 4371259 (1983-02-01), Howitt
patent: 4610538 (1986-09-01), Takenaka
patent: 4678319 (1987-07-01), Reiterer
patent: 5032866 (1991-07-01), Shoden et al.

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