Electrophotography – Control of electrophotography process – Color balance
Reexamination Certificate
2008-12-09
2010-10-12
Brase, Sandra L (Department: 2884)
Electrophotography
Control of electrophotography process
Color balance
C399S049000
Reexamination Certificate
active
07813659
ABSTRACT:
This invention provides an image forming apparatus capable of more reliably detecting patches formed on a recording medium while suppressing an increase in the consumption of printing media and toners. In an image forming apparatus which detects the density or color of each patch of a patch array fixed on a recording medium that is conveyed and corrects an image formation condition based on the detection result, the patches are formed as the patch array so that the conveyance-direction length of each patch gradually increases in an order of detection by the patch detection unit, and the conveyance-direction length of each patch gradually increases according to increasing of a detection position variation amount of a patch in the order of detection by the patch detection unit.
REFERENCES:
patent: 6853815 (2005-02-01), Tezuka et al.
patent: 6898381 (2005-05-01), Maebashi et al.
patent: 7224916 (2007-05-01), Iwakawa
patent: 2003/0049040 (2003-03-01), Tezuka et al.
patent: 2007/0134013 (2007-06-01), Soya et al.
patent: 2003-107833 (2003-04-01), None
Brase Sandra L
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
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