Charging roller, process cartridge and electrophotographic...

Details Charging roller, process cartridge and electrophotographic... Charging roller, process cartridge and electrophotographic...

2010-02-12

2010-11-16

Porta, David P (Department: 2884)

Electrophotography

Image formation

Charging

Reexamination Certificate

active

07835669

ABSTRACT:
The present invention provides a charging roller having a stable chargeability and capable of preventing occurrence of “fogging” on an electrophotographic image. The invention relates to a contact-charging type charging roller which includes a conductive support and a surface layer. The surface layer contains a binder, resin particles containing a carbon black dispersed in the binder, and graphitized particles dispersed in the binder; and the surface layer has, on its surface, convex portions derived from the resin particles, and convex portions derived from the graphitized particles. These convex portions have a specific relationship.

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