COLOR IMAGE FORMING DEVICE AND COLOR IMAGE FORMING METHOD

摘要

PROBLEM TO BE SOLVED: To make it possible to form color images at a high speed by reducing the number of steps for operating a polygon motor by the changed frequency dividing value and reducing the time when the rotation of the polygon motor becomes stable when finely adjusting the magnification of the image formed on the sheet of paper in which a fine difference in size is generated.

SOLUTION: A color image forming device has a determining means determining that the phase difference between an MST-IDX1 signal or an MST-IDX2 signal and a YIDX signal whose cycle length fluctuates by controlling the rotating speed and the phase of the polygon motor 36 is larger or smaller than the set threshold value Dw and a phase control means making the phase difference zero by accelerating or decelerating the rotating speed of the polygon motor 36 based on the result determined by the determining means when controlling the fine magnification of the image by controlling the rotating speed of the polygon motor and the phase of a drive clock signal.

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