| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection electrifying device capable of maintaining stable electrification uniformity even when a resistance controlled layer does not exist on the outermost surface of a body to be electrified in long-term use. SOLUTION: In this electrifying device, an electrifying member 2 to which voltage is applied is brought into contact with the body to be electrified 1 so as to electrify the surface of the body to be electrified. Then, the electrifying member is composed of an elastic body and the surface of the electrifying member has a speed difference from the surface of the body to be electrified and also conductive particles exist at least on the contact surface of the body to be electrified with the electrifying member. When it is assumed that the surface speed of the body to be electrified is Vd (mm/sec), the surface speed of the electrifying member is Vc (mm/sec), the contact width of the body to be electrified with the electrifying member is N (mm), and the covering rate of the conductive particles on the surface of the electrifying member is Rc (%), a relational expression N×Rc×|Vc-Vd|/Vd>=0.2 holds. When the volume resistance of the outermost layer of the body to be electrified is higher than 1×10<14> (Ω.cm), a relational expression N×Rc×|Vc-Vd|/Vd>=2 holds.
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