A charging device includes a charging member which is applied with a voltage including an alternating current voltage superimposed on a direct current voltage to charge an image carrier. An equation of "7.ltoreq.f/v.ltoreq.17" is satisfied, where "f" is a frequency (Hz) of the alternating current voltage, and "v" is a moving speed (mm/sec) of the image carrier.

 
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> Reduction of differential resolution of separations

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