Patent ID: 6788911
Filing Date: 2004-09-07
Classification: G03G

Abstract:
A charging device comprising:a charging member configured and positioned to electrically charge a member to be charged, which is adapted to form a nip with the member to be charged that has a surface layer having a volume resistivity of 1Ã—109-1Ã—1014 &OHgr;cm, said charging member having an elastic member and being movable with a peripheral speed difference relative to the member to be charged; and electroconductive particles carried on said charging member to the nip, wherein the peripheral speed Vd (mm/sec) of the member to be charged, the peripheral speed Vc (mm/sec) of said charging member, the width N (mm) of the nip measured in a moving direction of said charging member, and the coverage ratio Rc of said electroconductive particles on said charging member, satisfy: NÂ·RcÂ·|Vcâˆ’Vd|/Vd&gE;1.