| 摘要 |
PROBLEM TO BE SOLVED: To provide a contact electrifying device of high reliability where electrifying noise is surely prevented by applying a vibration restraining condition with a wide range of use that is derived by an efficient method. SOLUTION: In this device, an electrifying roll 1 that is constituted from conductive core metal 1a, a conductive elastic layer 1b and a coating layer 1c is rotated while in contact with a photoreceptor drum 3 that is constituted from a conductive substrate 3a and a photoreceptor 3b. Furthermore, bias voltage where AC voltage is superposed on DC voltage is applied between the core metal 1a and the substrate 3a by a power source 2. At this time, since a vibration system with a natural frequency fm that is vibrated due to electrostatic attracting force is constituted by the electrifying roll 1 and the photoreceptor 3, resonance of the vibration system and a comparatively large vibration taking into account viscous dampening resistance can be restrained by calculating the natural frequency fm from each parameter of the vibration system, expressing a frequency of the superposed AC voltage or a value that is twice that frequency as fac and setting it within a range of fac<=0.5 fm or fac>=1.5 fm.
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