Exposure control process and photographic copying apparatus

Details Exposure control process and photographic copying apparatus Exposure control process and photographic copying apparatus

1991-08-16

1992-11-17

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 355 71, 355 77, G03B 2780, G03B 2772

Patent

active

051647656

ABSTRACT:
The copying light of a source of copying light is attenuated in areas using a mask with different density ranges to influence the density by areas of a copy to be produced from a copy master. The appropriate area of the mask is selected by analyzing a location dependent density variation of the mask stored in matrix form in a computing and evaluating unit by predetermined criteria. A photographic copying apparatus associated with the process includes an exposure station with a mask mounted on a slide. The slide may be displaced in response to control signals determined and generated in the computing and evaluating unit. The slide is displaced in a plane parallel to a transport plane of the copy master in the beam path of a source of copying light.

REFERENCES:
patent: 3536402 (1970-10-01), Ashton
patent: 3594081 (1971-07-01), Tschink
patent: 3677633 (1972-07-01), Huber
patent: 4239385 (1980-12-01), Hujer
patent: 4801969 (1989-01-01), Hamidian
patent: 4933754 (1990-06-01), Reed et al.
patent: 5036351 (1991-07-01), Frick et al.

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