Patent ID: 9170519
Filing Date: 2015-10-27
Classification: G03G

Abstract:
1. A color image forming apparatus comprising: a transfer belt; a position indicator provided on the transfer belt; a sensor provided on a moving path of the position indicator, which moves when the transfer belt rotates, to detect the position indicator; and a controller configured to determine a transfer start position, at which a toner image is transferred from a photoconductor to the transfer belt, according to a sensing signal, which represents a width of the position indicator such that the toner image is formed on the photoconductor according to the determined transfer start position, wherein the sensor outputs a first sensing signal when a front end of the position indicator in a rotation direction of the transfer belt is detected, and outputs a second sensing signal when a rear end of the position indicator in the rotation direction of the transfer belt is detected, and wherein the controller determines one of the first sensing signal and the second sensing signal as noise when a time interval between the first sensing signal and the second sensing signal is not identical to a time corresponding to the width of the position indicator.