| 摘要 |
A charging apparatus includes a rotatable charging roller contactable to a member to be charged to electrically charge the member to be charged. The eharging roller includes a foam member and is supplied with a voltage including an oscillating component. A control means is provided for constant-current-control of the oscillating component. When the constant-current-control is carried out, a response time of the constant-current-control is longer than time required for a width to be charged to pass through a discharge area between the charging roller and the member to be charged.
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