| 摘要 |
PROBLEM TO BE SOLVED: To suppress generation of noise at the time of performing electrification while applying alternating voltages to respective electrifying members in an image forming device winch is provided with a plurality of electrifying members. SOLUTION: When pairs of photosensitive drums 5 and electrifying rollers 14 are (m) pieces ( four pieces in the example of the shown figure), (m) kinds of alternating signals whose phases are shifted are generated from the oscillation frequency fc of an oscillator 70 by phase shifting circuits 75 to 77 and alternating voltages for electrification Vc0, Vc1, Vc2, Vc3 whose frequencies are the same and whose phases are shifted by 2π/m are generated by (m) pieces of high-voltage amplifiers 71 to 74 based on respective alternating signals including the oscillation frequency fc and these voltages are applied individually to the plural electrifying rollers 14.
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