| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device in which the speed of a photoreceptor drum can be smoothly changed by maintaining cooperative driving between a plurality of photoreceptor drums driven by an oscillatory wave motor and a polygon mirror driven by an electromagnetic motor. SOLUTION: In the case of controlling the oscillatory wave motor on the basis of target speed and a speed signal so that the photoreceptor drum is rotated at the target speed and finely adjusting the oscillatory wave motor so that a BD signal and the speed signal has a specified phase difference, the speed of the oscillatory wave motor is finely adjusted according to a pseudo BD signal and the speed signal even when the BD signal is de-energized. |
