Image forming reverse charge printing method and apparatus using

Details Image forming reverse charge printing method and apparatus using Image forming reverse charge printing method and apparatus using

1998-11-23

1999-11-23

Smith, Mathew S.

Electrophotography

Image formation

Charging

399237, G03G 1502

Patent

active

059915781

ABSTRACT:
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.

REFERENCES:
patent: 4504138 (1985-03-01), Kuehnle et al.
patent: 5387760 (1995-02-01), Miyazawa et al.
patent: 5436706 (1995-07-01), Landa et al.
patent: 5563688 (1996-10-01), Bergen et al.
patent: 5619313 (1997-04-01), Domoto et al.
patent: 5826147 (1998-10-01), Liu et al.

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