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Image forming apparatus and charging device therefor

  • US 20040067074A1
  • Filed: 07/03/2003
  • Published: 04/08/2004
  • Est. Priority Date: 07/05/2002
  • Status: Active Grant
First Claim
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1. A charging device comprising:

  • a charge roller adjoining or contacting a surface of a photoconductive element;

    a DC voltage source configured to output a DC voltage;

    an AC voltage source configured to output an AC voltage;

    voltage applying means for superposing the DC voltage and the AC voltage and applying a resulting superposed voltage to said charge roller; and

    waveform control means for causing said AC voltage source to generate the AC voltage having a waveform pattern of particular noise and a frequency lying in a preselected range.

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