Patent ID: 7800799
Filing Date: 2010-09-21
Classification: G03G

Abstract:
1. A color shift correcting apparatus, comprising: a color shift detection pattern forming part that forms a color shift detection pattern; a sensor that detects color shift in the color shift detection pattern; a color shift amount computing part that calculates an amount of color shift; a color shift correcting part that corrects the calculated amount of color shift; a correction amount computing part that computes an amount of correction to correct the computed amount of color shift; a correcting part that corrects the computed amount of color shift based on the computed amount of correction based on a setting value for controlling a color shift state; a determining part that determines whether an abnormality is detected in the computed amount of color shift or in the computed amount of correction of color shift based on a result of computation of the amount of color shift or a result of computation of the amount of correction; a fixed value setting part that sets a specific fixed value to the setting value of said correcting part; and a control part that detects color shift again by using said specific fixed value after the abnormality is detected, and returns said setting value to an initial setting value when an occurrence of the abnormality is detected by said determining part again.