| 摘要 |
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 ¢substrate and; 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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