Electrophotography – Diagnostics – By inspection of copied image
Reexamination Certificate
2008-11-06
2009-10-06
Royer, William J (Department: 2852)
Electrophotography
Diagnostics
By inspection of copied image
C399S049000
Reexamination Certificate
active
07599632
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.
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patent: 6819902 (2004-11-01), Toyohara et al.
patent: 7206531 (2007-04-01), Suzuki et al.
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patent: 7310483 (2007-12-01), Mizuno
patent: 7450866 (2008-11-01), Sato
patent: 2001-290319 (2001-10-01), None
patent: 2004-145137 (2004-05-01), None
Canon Kabushiki Kaisha
Canon U.S.A. Inc. I.P. Division
Royer William J
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