Image forming apparatus

摘要

An image forming apparatus comprises color difference detection pattern output means that outputs an image signal to produce a color difference detection pattern for detecting periodic rotational variations arising in the image forming apparatus, to the image forming means; pattern detection means for detecting the color difference detection pattern formed on the endless carrier; phase detection means for detecting the phase of rotation of at least one of the image carriers of the image forming means on the basis of a detection signal received from the pattern detection means; and rotational phase control means for individually controlling the phase of rotation of at least one of the image carriers of the image forming means and the endless carrier on the basis of the phase information detected by the phase detection means.