Image forming apparatus

Details Image forming apparatus Image forming apparatus

2008-03-18

2010-06-22

Tran, Hoan (Department: 2884)

Electrophotography

Image formation

Development

C399S282000

Reexamination Certificate

active

07742727

ABSTRACT:
An image forming apparatus has a photoconductive member on which a latent image is to be formed, a developing roller for developing the latent image on the photoconductive member by a first bias. A magnetic roller forms a magnetic brush thereon with a two-component developer and forms a thin toner layer on the developing roller by a second bias. The developing roller is aluminum with a surface treated for high resistance. The thickness (T) of the toner layer and the duty ratio (D1) of the first alternating-current bias satisfy relationships of the following equations for calculating the duty ratio (D1) using an application period of a voltage in a direction to transfer the toner from the developing roller towards the photoconductive member as a positive period:in-line-formulae description="In-line Formulae" end="lead"?7 μm≦T≦13 μm, andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?35%≦D1≦70%.in-line-formulae description="In-line Formulae" end="tail"?

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