Image forming apparatus to control voltage of development unit

Details Image forming apparatus to control voltage of development unit Image forming apparatus to control voltage of development unit

2006-06-29

2008-10-07

Brase, Sandra L (Department: 2852)

Electrophotography

Control of electrophotography process

Control of developing

Reexamination Certificate

active

07433617

ABSTRACT:
An image forming apparatus includes a plurality of developing units to form a color image using at least a two pass developing process by developing electrostatic latent image with toners having different colors and polarities when performing a first pass of the developing process, and an exposing unit to form a tri-level potential on a photosensitive medium, in which a development applied voltage applied to a second developing unit among a first developing unit and second developing unit of the plurality of developing units operating during the first pass of the developing process is divided into a development voltage Vd, a collection voltage Vc, and at least one intermediate voltage Vn. The intermediate voltage Vn is selectively applied to one of the developing unit during a development voltage Vd applied time during which the second development voltage Vd is applied to the developing unit and during a collection voltage Vc applied time during which the collection voltage Vc is applied to the second developing unit to control one of the development voltage applied time and the collection voltage applied time without changing the other one of the development voltage applied time and the collection voltage applied time.

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