Invention Grant
- Patent Title: Developing roller and manufacturing method thereof, process cartridge and electrophotographic image forming apparatus
- Patent Title (中): 显影辊及其制造方法,处理盒和电子照相成像设备
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Application No.: US12719419Application Date: 2010-03-08
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Publication No.: US07881646B2Publication Date: 2011-02-01
- Inventor: Minoru Nakamura , Kazuaki Nagaoka , Yoshiyuki Takayama
- Applicant: Minoru Nakamura , Kazuaki Nagaoka , Yoshiyuki Takayama
- Applicant Address: JP Tokyo
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP Tokyo
- Agency: Fitzpatrick, Cella, Harper & Scinto
- Priority: JP2008-294293 20081118
- Main IPC: G03G15/08
- IPC: G03G15/08 ; A01B29/00 ; B05C11/00 ; F16C13/00

Abstract:
A developing roller suppresses scattering of toner during a developing process and provides a further higher-quality electrophotographic image. The developing roller has a mandrel, an elastic layer provided on the circumference of the mandrel, and a surface layer provided on the circumference of the elastic layer. The surface layer contains a urethane resin serving as a binder and urethane resin particles dispersed in the binder, for forming convex portions on the surface of the surface layer. The surface of the urethane resin particles is partly covered with fine inorganic particles containing at least one element selected from silicon, titanium and aluminum and the urethane resin particles are in direct contact with the binder at the surface onto which the fine inorganic particles are not attached.
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