| 摘要 |
PURPOSE:To eliminate an interference fringe by regulating such that the frequency of a power source applying a bias to a contact electrifying member does not overlap with a varying range of spacial wavelength determined by the fluctuating margin of a process speed and a line pitch. CONSTITUTION:An oscillating voltage is applied to the contact electrifying member 2. It is caused to abut on an image carrier 1 and is relatively moved to electrify the surface of the image carrier. By scanning a line, picture information is written on the electrified surface to form an image. Where the frequency of the oscillating voltage is (f), the moving speed of the image carrier 1 as the process speed of the device is Vp, the spacial wavelength of electrification is lambdasp(=Vp/f), and the line pitch is l, ranges of the frequency (f) and the process speed Vp are set so that the varying range of the spacial wavelength lambdasp does not overlap with the line pitch l multiplied by N or 1/N (N: integer). Consequently, the occurrence of interference fringes is prevented.
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