Image forming apparatus that prevents attachment of toner to...

Details Image forming apparatus that prevents attachment of toner to... Image forming apparatus that prevents attachment of toner to...

2005-07-12

2005-07-12

Beatty, Robert (Department: 2852)

Electrophotography

Image formation

Development

C399S060000, C399S285000

Reexamination Certificate

active

06917780

ABSTRACT:
An image forming apparatus of non-contact developing method using two-component developer material which is capable of obtaining a clear image free from fogging, ghost and toner contamination. The image forming apparatus has at least one developing unit which includes a developing roll and a magnetic roll, the developing unit develops an electrostatic latent image on a photosensitive body with a toner thin layer formed on the surface of a developing roll wherein a toner thin layer forming region on the developing roll is smaller than a magnetic brush forming region on the magnetic roll. A high resistivity region is adjacent each end of the toner thin layer forming region on the developing roll. A control device controls a developer material replenishment and controls the biasing to the developing roll and magnetic roll.

REFERENCES:
patent: 4385829 (1983-05-01), Nakahata et al.
patent: 4669852 (1987-06-01), Tajima et al.
patent: 5581326 (1996-12-01), Ogata et al.
patent: 5991587 (1999-11-01), Kikuchi
patent: 6035169 (2000-03-01), Miyake et al.
patent: 05053423 (1993-03-01), None
patent: 09311548 (1997-12-01), None

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