Single pass digital printer with black, white and 2-color capabi

Details Single pass digital printer with black, white and 2-color capabi Single pass digital printer with black, white and 2-color capabi

1991-07-26

1992-10-13

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355326, 355327, G03G 1501

Patent

active

051555417

ABSTRACT:
Method and apparatus for printing toner images in black and at least two highlighting colors in a single pass of the imaging surface through the processing areas of the printing apparatus. Imaging and development techniques of color photography and tri-level xerography are combined to produce images with black and two colors wherein the two highlighting colors are developed with only one color toner. A single imaging step forms a four level charge pattern on a charge retentive surface followed by development of two of the image levels using tri-level imaging techniques. Uniform exposure of the imaging surface, similar to that used to color photography techniques precedes development of the last image. The uniform exposure modifies the last developed image level and the background charge level allowing development of the last image with a single toner.

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