Image forming apparatus and method for forming images for...

Details Image forming apparatus and method for forming images for... Image forming apparatus and method for forming images for...

2005-12-02

2008-11-11

Royer, William J (Department: 2852)

Electrophotography

Diagnostics

By inspection of copied image

C399S049000

Reexamination Certificate

active

07450866

ABSTRACT:
An image forming apparatus configured to carry out development using a light toner and a dark toner having substantially the same hue, includes a pattern forming unit configured to form a pattern using a dark toner and a light toner, a pattern reading unit configured to read the density of the pattern formed on a sheet of recording paper after the pattern has been fixed, and a gradation correction unit configured to correct the gradation characteristics of image data for the light toner by changing the slope of the gradation characteristics with zero level as a base point. The changing of the slope is based on the density characteristics of the pattern read by the pattern reading unit and the ratio of the amounts of the light toner and the dark toner that have been used.

REFERENCES:
patent: 6498910 (2002-12-01), Haneda
patent: 6819902 (2004-11-01), Toyohara et al.
patent: 7206531 (2007-04-01), Suzuki et al.
patent: 7209673 (2007-04-01), Suzuki et al.
patent: 7310483 (2007-12-01), Mizuno
patent: 2001-290319 (2001-10-01), None
patent: 2004-145137 (2004-05-01), None

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