| 摘要 |
There is provided a potential controlling method and potential controller of an image forming apparatus, which can certainly prevent toner and carrier from adhering to the surface of an image bearing body at the time of start and stop of image formation and which can also be applied to an image forming apparatus having a high image forming speed. In the potential controller, at the time of rising or falling of a charged potential of the image bearing body and a developing bias voltage, at least one of the charged potential of the image bearing body and the developing bias voltage is controlled to an objective value through plural stages with the rising or falling of the other occurring through the stages, so that a potential difference between a potential of a non-charged portion of the image bearing body and the developing bias voltage does not exceed a first predetermined value, and a potential difference between a potential of a charged portion of the image bearing body and the developing bias voltage does not exceed a second predetermined value.
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