Image forming apparatus having subsidiary charge roller

Details Image forming apparatus having subsidiary charge roller Image forming apparatus having subsidiary charge roller

2007-05-08

2007-05-08

Chen, Sophia S. (Department: 2852)

Electrophotography

Image formation

Development

C399S284000

Reexamination Certificate

active

10899111

ABSTRACT:
An image forming apparatus including a subsidiary charge roller and a development roller, wherein the diameter ratio I of the subsidiary charge roller to the development roller is in the range of 0.45 to 0.8. The subsidiary charge roller and the development roller can be arranged such that the linear velocity of the subsidiary charge roller Vs is larger than the linear velocity of the development roller Vd, and preferably the linear velocity ratio K of the subsidiary charge roller to the development roller is in the range of 1.01 to 1.06. Alternatively, the image forming apparatus can further include a compression section for applying a predetermined pressure to the opposite ends of the shaft of the subsidiary roller and a development roller gear coaxially formed on the development roller shaft.

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