| 摘要 |
An improved corona charging device for uniformly charging an image bearing or forming member is provided. The charging device includes a corona wire, a conductive shield partly surrounding the wire and a high voltage source connected to the wire. The voltage source includes a first voltage source for applying an A.C. voltage to the wire and a second voltage source for applying a D.C. voltage to the wire as a bias. The present charging device charges the member uniformly to a desired level at all times irrespective of the potential condition of the member prior thereto.
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