G - Physics – 03 – G
Patent
G - Physics
03
G
314/12
G03G 13/01 (2006.01) G03G 15/01 (2006.01) G03G 15/05 (2006.01)
Patent
CA 1060085
Abstract of the Disclosure Systems and methods for multicolor electrostatic reproduction, printing or constituting on dielectric and non- dielectric print receiving media utilizing screens and a light varying charge distribution in accordance with selected color separation patterns. Ions accelerated through the screen apertures across an air gap are used to form electrostatic latent images transferring to selected color separation patterns which are developed in sequence and registry. Masking to correct for dye absorption errors is carried out by applying earlier formed electrostatic latent color separation images to later formed color separation images to reduce the amount of toner applied in previously printed areas of different color. Pre-illumination charging of photoconductive screen layers is otherwise accomplished by protecting the charging ions through the screen apertures from the side of the element opposite the photoconductive layer with the underlying conductive layer having a field applied so that charging is automatically halted when ion deposits on the photoconductive surface equal or slightly exceed the original bias. Incompletely developed images are neutralized by the deposit of oppositely charged ions on the undeveloped portions of the image, these ions being controlled by a screen having first and second conductive layers interposed with an insulative layer, the conductive layers being biased. Gray scale control is accomplished by sequentially biasing the voltage across two conductive layers of the screen at two or more levels during the finite interval when ions are propelled through the screen apertures.
212435
Gardiner Kenneth W.
Pressman Gerald L.
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