Patent ID: 8019238
Filing Date: 2011-09-13
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming portion having a rotator and being configured to form an image on at least one of said rotator and a recording medium traveling with rotation of said rotator; a storage portion configured to store change characteristics information relevant to correction parameters corresponding to phase points of said rotator; a designating portion configured to designate a correction parameter from said correction parameters based on said change characteristics information; a correcting portion configured to correct an image forming position on said at least one of said rotator and said recording medium based on the correction parameter designated by said designating portion; a detecting portion configured to detect that said rotator has reached a detecting phase point; a first determining portion configured to determine, based on a time when said detecting portion detects said detecting phase point of said rotator, whether a current phase of said rotator corresponds to a shifting phase point; a second determining portion configured to determine whether said image forming portion is in inactive time; and a shifting portion configured to shift a designation by said designating portion to the correction parameter corresponding to said shifting phase point, when said first determining portion determines that the current phase of said rotator corresponds to said shifting phase point and said second determining portion determines that said image forming portion is in inactive time.