| 摘要 |
PURPOSE:To maintain the surface potential of a photosensitive body at a low level so as to improve the durability of the photosensitive body, by performing developing operations after the surface potential of the photosensitive body and the mixing potential, periods, and pulse widths of DC pulses are set so as to satisfy specific conditions. CONSTITUTION:Developing operations are performed after the surface potential Vb and the maximum potential Vbias, periods (t), and pulse widths t1 of DC pulses are set so that the formula can be satisfied under a condition where a pulse bias frequency is 100-5,000Hz. Therefore, the maximum potential Vbias can be raised to a level which is close to the surface potential of the photosensitive body or higher while preventing the spreading and fogging of pictures. As a result, the surface potential of the photosensitive body can be maintained at a low level and the durability of the body can be improved.
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