| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of density unevenness due to electrifying irregularities by surely electrifying a body to be electrified without generating ozone. SOLUTION: An electrifying roller 8 is closely provided to the surface of a photoreceptive drum 1 so as to form a specified gap within an electrifying area in an electrifying device 2. DC bias whose voltage is controlled to be constant and AC bias whose voltage is controlled to be constant are supplied to the core bar 11 of the electrifying roller 8 from a power source unit 12, so that the surface of the photoreceptive drum 1 is uniformly electrified. The voltage of an AC component applied to the electrifying roller 8 has a peak-to- peak voltage value equal to or above twice of an electrification start voltage value at a maximum gap between the electrifying roller 8 and the photoreceptive drum 1.
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