Selective coloring of bi-level latent electostatic images

Details Selective coloring of bi-level latent electostatic images Selective coloring of bi-level latent electostatic images

1990-12-24

1992-06-02

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118645, 118654, 355247, G03G 1501

Patent

active

051191474

ABSTRACT:
Selective coloring of bi-level latent electrostatic images is obtained through a combination of 1) a scavengeless development nip enabled by an AC biased wire in self-spaced contact with a toned donor roll, 2) a belt image receiver such as either a photoreceptor or electroreceptor without a ground plane and 3) an array of addressable, stationary electrodes positioned behind the belt in alignment with the AC biased wire. Selective coloring of the electrostatic image is obtained by selectively DC biasing addressable, stationary electrode structures forming electrode arrays positioned behind the belt. By controlling the level and timing for applying a DC bias to each electrode segment, the developability can be switched on and off with x,y addressability in the plane of the electrostatic image. Thus, with a system having resident multi-colored development systems, different areas of the electrostatic image can be developed in a single pass with different colors and perfect registration simply by controlling the DC electrical signals to the electrodes.

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patent: 4811046 (1989-03-01), May
patent: 4868600 (1989-09-01), Hays et al.
patent: 4913348 (1990-04-01), Hays

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