Image forming apparatus and image forming method

Details Image forming apparatus and image forming method Image forming apparatus and image forming method

2005-08-23

2005-08-23

Chen, Sophia S. (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C358S521000, C399S072000

Reexamination Certificate

active

06934481

ABSTRACT:
A gradation patch image Ip used for determination of tone characteristics of an apparatus is progressively varied in the tone level thereof from the maximum tone level (level255) to the minimum tone level (level0). The gradation patch image is either a toner image continuously and consistently varied in the tone level thereof or a toner image having the tone levels varied stepwise at a smaller pitch than a width of a detection region of a patch sensor. In density detection of such a gradation patch image Ip, toner image densities at portions on either sides in the detection region of the patch sensor are canceled each other out by averaging and hence, only a toner image density substantially at the center of the detection region can be obtained.

REFERENCES:
patent: 4377338 (1983-03-01), Ernst
patent: 5274424 (1993-12-01), Hattori et al.
patent: 5543896 (1996-08-01), Mestha
patent: 5889928 (1999-03-01), Nakamura et al.
patent: 6061144 (2000-05-01), Mamizuka
patent: 0 763 783 (1997-03-01), None
patent: 6-311365 (1994-11-01), None
patent: 9-106120 (1997-04-01), None
patent: 9-233340 (1997-09-01), None
patent: 9-233341 (1997-09-01), None
patent: 3325765 (2002-09-01), None
patent: 3369039 (2003-01-01), None

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