Color image forming apparatus

Details Color image forming apparatus Color image forming apparatus

2006-09-12

2006-09-12

Grimley, Arthur T. (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S039000, C399S051000, C399S046000

Reexamination Certificate

active

07106983

ABSTRACT:
A color image forming apparatus includes a developing unit to which a developing bias with an AC component superposed is applied, wherein the DC voltage of the developing bias is adjusted to set the detected density of a solid image at a specified value, the light amount of radiation for exposing an image area having a width of a few dots adjacent to the white paper is adjusted to set the detected density of an image developed under a peripheral electric field at a specified value, and the gradation density curve is regulated by alternately adjusting the DC voltage, the light amount of radiation for exposing the image area having a width of a few dots adjacent to the white paper, and the amplitude of the AC component until the detected density of a mesh point image having an area ratio from 60 to 80% falls within a specified range.

REFERENCES:
patent: 5950042 (1999-09-01), Goto et al.
patent: 6686943 (2004-02-01), Ishii et al.
patent: 2003/0091356 (2003-05-01), Komatsu et al.
patent: 63-240569 (1988-10-01), None
patent: 11-15214 (1999-01-01), None
patent: 2001-358955 (2001-12-01), None

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