Invention Grant
- Patent Title: Development roller, development device, image forming apparatus, and method of manufacturing development roller
- Patent Title (中): 显影辊，显影装置，成像装置和显影辊的制造方法
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Application No.: US12388908Application Date: 2009-02-19
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Publication No.: US07907879B2Publication Date: 2011-03-15
- Inventor: Yoichi Yamada , Masahiro Maeda , Junichi Suzuki , Takatomo Fukumoto
- Applicant: Yoichi Yamada , Masahiro Maeda , Junichi Suzuki , Takatomo Fukumoto
- Applicant Address: JP Tokyo
- Assignee: Seiko Epson Corporation
- Current Assignee: Seiko Epson Corporation
- Current Assignee Address: JP Tokyo
- Agency: DLA Piper LLP (US)
- Priority: JP2008-039955 20080221; JP2008-039956 20080221
- Main IPC: G03G15/08
- IPC: G03G15/08
Abstract:
A development roller includes a base unit having a base recess and a base projection that are formed in a predetermined area of a circumference surface of the base unit, and a surface layer formed on the circumference surface of the base unit and having on the circumference thereof a recess and a projection formed respectively in accordance with the base recess and the base projection of the base unit. Surface hardness of the projection is higher than surface hardness of the recess.
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