| 摘要 |
PROBLEM TO BE SOLVED: To reduce banding images to be generated due to driving frequency of a switching regulator provided in a power supply device.SOLUTION: A power supply device 200 outputs a developing voltage Vp having different pulse waveforms in positive and negative amplitudes. A bridge circuit for driving a transformer T1 is supplied with voltages Va, Vb from two switching regulators SR1, SR2, respectively. An absolute value of a difference between a driving frequency fs1 of the switching regulator SR1 and a driving frequency fst of the switching regulator SR2 is set to be equal to or larger than an invisible frequency fth at which a banding image cannot be visually recognized by a person. |
