Automatic set-up for electrophotographic copying of transparency

Details Automatic set-up for electrophotographic copying of transparency Automatic set-up for electrophotographic copying of transparency

1991-05-28

1992-02-11

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355229, 355246, G03G 2100

Patent

active

050879421

ABSTRACT:
An electrophotographic copier uses a first light source to copy reflection originals and uses a second light source to copy transparency originals. Operation of the copier is adjusted to attain a desirable copy image of reflection originals using the first light source, and then the second light source is used to expose a patch on the image receiver through a test transparency of predetermined optical density. When the patch is developed, its optical density is compared to an aim value, and any difference is used for adjusting the exposure value of the second light source.

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patent: 4894685 (1990-01-01), Shoji
patent: 4990957 (1991-02-01), Nakanishi et al.

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