Invention Grant
- Patent Title: Charging roller, process cartridge and electrophotographic apparatus
- Patent Title (中): 充电辊,处理盒和电子照相设备
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Application No.: US12704818Application Date: 2010-02-12
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Publication No.: US07835669B2Publication Date: 2010-11-16
- Inventor: Takumi Furukawa , Tomohito Taniguchi , Hidekazu Matsuda , Yusuke Yagisawa
- Applicant: Takumi Furukawa , Tomohito Taniguchi , Hidekazu Matsuda , Yusuke Yagisawa
- Applicant Address: JP Tokyo
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP Tokyo
- Agency: Fitzpatrick, Cella, Harper & Scinto
- Priority: JP2008-281599 20081031
- Main IPC: G03G15/02
- IPC: G03G15/02

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.
Public/Granted literature
- US20100142998A1 CHARGING ROLLER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS Public/Granted day:2010-06-10
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