Image forming apparatus having constant current and voltage cont

Details Image forming apparatus having constant current and voltage cont Image forming apparatus having constant current and voltage cont

1994-05-09

1995-09-12

Picard, Leo P.

Photocopying

Contact printing

Light boxes

355277, G03G 1516

Patent

active

054501806

ABSTRACT:
An image forming apparatus includes a movable image bearing member; an image forming device for forming an image on the image bearing member; a charging member disposed opposed to the image bearing member; and bias application device for applying a bias voltage to the charging member, wherein the bias applying device effects a constant voltage control to the charging member when an image area of the image bearing member is in a charging region of the charging member, and effects a constant current control during at least a part of a period in which an area of the image bearing member other than the image area is in the charging region, and wherein a level of a constant voltage of the constant voltage control is determined during the constant current control.

REFERENCES:
patent: 3781105 (1973-12-01), Meagher
patent: 3837741 (1974-09-01), Spencer
patent: 4563081 (1986-01-01), Sato
patent: 4949125 (1990-08-01), Yamamoto et al.
patent: 4977430 (1990-12-01), Florack et al.
patent: 5010370 (1991-04-01), Araya et al.
patent: 5034777 (1991-07-01), Ohzeki et al.

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