Patent ID: 8179541
Filing Date: 2012-05-15
Classification: G03G,H04N

Abstract:
1. An image forming apparatus comprising: an image bearing member; an image writing section for writing an electrostatic latent image onto the image bearing member; a transfer section for transferring, onto a sheet of recording paper, an image obtained by developing with a developer the electrostatic latent image written onto the image bearing member; a carrying position detecting section for detecting, on a recording-paper carrying path provided between a paper feeding section for feeding a sheet of recording paper and the transfer section, an amount of misalignment of a sheet of recording paper in a direction perpendicular to a carrying direction; and a correcting section for correcting, in accordance with an amount of misalignment detected by the carrying position detecting section, a writing position at which the image writing section writes an electrostatic latent image onto the image bearing member, in continuous printing of plural sheets of recording paper, the correcting section (i) correcting the writing position for a first sheet of recording paper in accordance with a first amount of misalignment detected by the carrying position detecting section with respect to the first sheet of recording paper, and (ii) correcting the writing position for an nth sheet of recording paper (where n is an integer of not less than 2) in accordance with a second amount of misalignment detected by the carrying position detecting section with respect to the sheets of recording paper up to an (n−1)th sheet of recording paper, wherein in a case where an absolute value of a difference between (a) a third amount of misalignment detected by the carrying position detecting section with respect to the nth sheet of recording paper and (b) the second amount of misalignment exceeds a threshold, the correcting section corrects the writing position for the nth sheet of recording paper in accordance with the third amount of misalignment and causes the image writing section to again write an electrostatic latent image at the writing position corrected in accordance with the third amount of misalignment, instead of writing an electrostatic latent image at the writing position corrected in accordance with the second amount of misalignment.