Image forming apparatus with developing bias correcting...

Details Image forming apparatus with developing bias correcting... Image forming apparatus with developing bias correcting...

2011-03-01

2011-03-01

Royer, William J (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S049000, C399S055000, C399S072000

Reexamination Certificate

active

07899348

ABSTRACT:
A controller takes in a detection signal indicating the surface electrical potential of a photoconductive drum (7) from a surface electrical potential sensor (step #1), and determines whether the surface electrical potential is smaller than the predetermined threshold value (step #2). As a result, when the controller (6) determines that the surface electrical potential is equal to or greater than the predetermined threshold value (NO in step #2), it uses the low print rate density patch to execute the density adjustments in accordance with the toner density and the developing bias associated with the density patch (step #3). When the controller (6) determines that the surface electrical potential is smaller than the predetermined threshold value (NO in step #1), it uses a high print rate density patch to execute the density adjustments in accordance with the toner density and the developing bias associated with the density patch (step #4).

REFERENCES:
patent: 6686943 (2004-02-01), Ishii et al.
patent: 7398025 (2008-07-01), Campbell et al.
patent: 62-233978 (1987-10-01), None
patent: 62-235685 (1987-10-01), None
patent: 9-187997 (1997-07-01), None

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