Image forming reverse charge printing method and apparatus using image area centered patches of toner
An efficient and high quality image forming method and apparatus wherein only selective scattered portions of an imaging surface are charged with a first charging device, and then coated with a layer of charged toner solids by a toner supply apparatus, thereby forming an "image area patch of toner"; wherein each selected scattered portion is centered relative to, and has an area slightly exceeding an area to be imaged; each such charged and coated portion is then image-wise exposed to form a first latent image; each such coated portion is subsequently recharged by a reverse charge printing (RCP) second charging device in an image-wise manner to create a secondary latent image having toner solids in image areas charged to a first polarity, and toner solids in background areas charged to a second and opposite polarity; and finally the toner solids in the image areas thereof are then transferred onto a copy substrate for fixing as an output document, thus leaving a significantly diminished quantity of non-development toner for subsequent removal from the photoreceptor.
Xerox Corporation
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Chu-Heng Weizhong
Liu Zhao