| 摘要 |
This invention relates to a non-contact developing method for applying a driving voltage, which is an AC voltage superimposed on a DC offset voltage, to a non-contact developing roller to develop toner, and which prevents the selective developing phenomenon from occurring. The velocity ratio between the flying velocity of toner with a large particle size and the flying velocity of toner with a small particle size changes according to the driving frequency f of the AC voltage (45) applied to the developing roller, so by setting the driving frequency f of the AC component within a range where selective developing of the toner does not occur, it is possible to effectively prevent the selective developing phenomenon from occurring.
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