Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-09-26

2006-09-26

Royer, William J. (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S049000, C399S051000

Reexamination Certificate

active

07113712

ABSTRACT:
A high-precision image control method that can be conducted frequently without time or labor. When a sheet-passing operation starts, maximum exposure is performed at present settings in a predetermined non-image forming area and potential is detected by a potential sensor. Detected potential is compared with VHat a first control to judge whether a difference of 10 V or more exists. For a difference of 10 V or more, the signal is made responsive to laser output for achieving VHset at the first control. When the last image forming for that job is performed, potential returns to the potential set at the first control, and control ends. When the last image forming is completed in a consecutive job during short-term variability of VH, VHis restored to its original potential before the next job, whereby settings obtained with the first control are restored.

REFERENCES:
patent: 5694223 (1997-12-01), Katori et al.
patent: 6266495 (2001-07-01), Yuminamochi et al.
patent: 6529694 (2003-03-01), Fukaya et al.
patent: 11-258931 (1999-09-01), None

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