| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems where the output of a high voltage power source is not stable and a control ripple is mostly increased, in the case a transfer belt is of low resistance and the output of the high voltage power source is low, and then error with respect to a target value becomes large. SOLUTION: For an image forming device supplying a switching PWM signal to the high-voltage power source part 26 to generate the high-voltage output, and then controlling the duty of the PWM signal, based on a differential value between the detection value of the high-voltage output and a previously set reference value, the device is provided with a high-voltage output control means 27 for switching the duty control system for the PWM signal, based on the results obtained by monitoring the set PWM value, and for deciding the duty of the PWM signal. |
