Photographic copying machine with means for varying exposure acr

Details Photographic copying machine with means for varying exposure acr Photographic copying machine with means for varying exposure acr

1979-05-09

1980-12-16

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2772

Patent

active

042393850

ABSTRACT:
A photographic copying machine of the type in which exposure radiation is transmitted through a transparent original onto a photosensitive medium. Arranged in the exposure radiation path is an array of multitudinous controllable-transmissivity elements, the individual transmissivity values of which are individually controllable. A control electronics, preferably incorporating a computer and multiplexer, controls the transmissivity values of the multitude of controllable-transmissivity elements of the array. The transmissivity values to which the multitude of elements are set can be equal, but in accordance with the present invention are not; instead, the array is employed to establish a two-dimensional controllably non-uniform distribution of exposure radiation onto the photosensitive medium. This is done to implement non-uniform density and/or color correction during printing, or to superimpose onto the image projected onto the photosensitive medium images of symbols, text, or the like, which are to be appear on the final copy, or to implement border effects, by way of example.

REFERENCES:
patent: 3761172 (1973-09-01), Letzer
patent: 3912391 (1975-10-01), Fleisher et al.
patent: 4149799 (1979-04-01), Pone, Jr. et al.
patent: 4152068 (1979-05-01), Bickl et al.

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