Patent ID: 6603495
Filing Date: 2003-08-05
Classification: H04N

Abstract:
An image forming apparatus, comprising:a plurality of image forming means each having an image bearing body and write means for forming images of different colors on said image bearing body; a moving member on which the images formed on said image bearing bodies by said plurality of image forming means are transferred at respective transfer locations; pattern forming means for controlling said plurality of image forming means so as to form a plurality of pattern images inclined with respect to a movement direction of said moving member so that two pattern images of a predetermined reference color are transferred onto said moving member with one pattern image of a different color transferred therebetween; pattern detecting means for detecting the plurality of pattern images transferred onto said moving member; aberration detecting means for detecting aberration of the one pattern image of the different color with respect to the two pattern images of the reference color on the basis of an output from said pattern detecting means; and correction means for correcting the aberration of the one pattern image of the different color on the basis of the aberration detected by said aberration detecting means, wherein the plurality of pattern images includes first pattern images having a first angle with respect to the movement direction of said moving member and second pattern images having a second angle with respect to the movement direction of said moving member.