Image forming apparatus with precharger

Details Image forming apparatus with precharger Image forming apparatus with precharger

1994-09-19

1996-06-04

Royer, William J.

Photocopying

Contact printing

Light boxes

355219, 355270, G03G 1509, G03G 1502

Patent

active

055238254

ABSTRACT:
An image forming apparatus includes a photoreceptor, and a developing unit arranged in the vicinity of the photoreceptor. At an upstream side from the developing unit, a precharger is provided in a manner that the same is brought into contact with a surface of the photoreceptor. A developing bias voltage is applied to a developing sleeve, and a charging voltage is applied to the precharger. After the photoreceptor is charged by the precharger, the surface of the photoreceptor is brought into contact with a magnetic brush formed by a developing agent in which an insulative toner and a semiconductive magnetic carrier is mixed, whereby the photoreceptor is charged again by the developing bias voltage through the semiconductive magnetic carrier.

REFERENCES:
patent: 4666801 (1987-05-01), Kimura et al.
patent: 4804994 (1989-02-01), Sasaki et al.
patent: 5053821 (1991-10-01), Kunugi et al.
patent: 5138387 (1992-08-01), Sato et al.
patent: 5172163 (1992-12-01), Yamaoki et al.
patent: 5374978 (1994-12-01), Asanae et al.
patent: 5424811 (1995-06-01), Haneda

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