Image forming device that prevents reverse transfer and...

Details Image forming device that prevents reverse transfer and... Image forming device that prevents reverse transfer and...

2007-07-03

2007-07-03

Chen, Sophia S. (Department: 2852)

Electrophotography

Image formation

Combined or plural functions by single component

C399S053000, C399S071000, C399S099000

Reexamination Certificate

active

11092675

ABSTRACT:
In a color laser printer, the amount of reversely transferred developing agent on the surface of a developing roller is estimated based on the operating time of the color laser printer, the surface area of an image, and the charging amount of developing agent. When the estimated amount of reversely transferred developing agent reaches a predetermined value, a solid image is formed on a photoconductor drum. By transferring the solid image onto recording paper, a conveyer belt, or an intermediate transfer belt, the reversely transferred developing agent is removed. Alternatively, by rotating the developing roller in a state in which the developing roller is separated from the photoconductor drum, the reversely transferred developing agent on the surface of the developing roller is collected into a developing agent hopper.

REFERENCES:
patent: 6952547 (2005-10-01), Watanabe et al.
patent: 2003/0147669 (2003-08-01), Kakeshita
patent: 2004/0038142 (2004-02-01), Yoshida et al.
patent: B2 3248047 (2001-11-01), None

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