| 摘要 |
PURPOSE:To uniformly electrify a photosensitive body regardless of the linear velocity of the photosensitive body and to prevent the degradation of a picture quality by satisfying a specified relation to the frequency of AC voltage and the linear velocity of a photosensitive body. CONSTITUTION:A pulsating voltage superposing a DC voltage and an AC voltage on contact electrifying member such as an electrifying roller 102 abutted on the photosensitive body 101 is applied and a power unit 108 for electrifying the photosensitive body is provided. The power unit 108 is constituted of a DC power supply 108a which varies the output of the DC voltage and an AC power source 108b capable of varying the frequancy of AC voltage and A peak- to-peak voltage. Assuming that the frequencies of the AC voltage is (f)Hz and the linear velocity of the photosensitive body is (v)mm/sec, the relation of 4<f/v<7 is satisfied. That is, the pulsating voltage superposed with the appropriate frequency of the AC voltage and the DC voltage corresponding to the linear velocity of the photosensitive body 101 is applied on the electrifying component such as the electrifying roller 102 abutted on the photosensitive body 101. |
