Image forming apparatus

Electrophotography – Control of electrophotography process – Control of developing

Reexamination Certificate

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Details

C399S072000, C399S094000, C399S097000

Reexamination Certificate

active

07965954

ABSTRACT:
A control unit controls a device that executes an image forming process, compares changes of each toner adhesion amount in an image-density-detection pattern image when a developing-bias control condition is changed, with respect to a toner adhesion amount in an image-density-detection pattern image in a normal status, performs a malfunction-occurrence prediction process according to the degree of each change of the densities, and displays the result.

REFERENCES:
patent: 2005/0157327 (2005-07-01), Shoji et al.
patent: 63-289563 (1988-11-01), None
patent: 4-258080 (1992-09-01), None
patent: 7-168484 (1995-07-01), None
patent: 8-262818 (1996-10-01), None
patent: 11-84829 (1999-03-01), None
patent: 2000-19818 (2000-01-01), None
patent: 2003-178153 (2003-06-01), None
patent: 2004-345091 (2004-12-01), None
patent: 2005-176045 (2005-06-01), None
U.S. Appl. No. 12/210,715, filed Sep. 15, 2008, Takahashi et al.

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