Invention Grant
- Patent Title: Developing roller, process cartridge and electrophotographic image forming apparatus
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Application No.: US16832605Application Date: 2020-03-27
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Publication No.: US10895824B2Publication Date: 2021-01-19
- Inventor: Ryo Sugiyama , Yoshinobu Ogawa , Masashi Uno , Tomoya Uesugi , Kenta Matsunaga , Wataru Moriai
- Applicant: CANON KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: CANON KABUSHIKI KAISHA
- Current Assignee: CANON KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Agency: Canon U.S.A., Inc. IP Division
- Priority: JP2019-070139 20190401
- Main IPC: G03G15/08
- IPC: G03G15/08 ; G03G21/18

Abstract:
A developing roller that suppresses contamination of the surface of a photosensitive member and also obtains a high-quality image. The developing roller includes an electro-conductive substrate, an electro-conductive elastic layer and a surface layer which are stacked in this order, wherein the surface layer has resin particles that are dispersed in a polyurethane matrix, an outer surface of the surface layer has a first protrusion originating in first resin particle and a second protrusion originating in second resin particle, wherein the first resin particle contains polyurethane, an elastic modulus E1 of the first resin particle is 100 to 2000 MPa, an elastic modulus E2 of the second resin particle is 2 to 50 MPa, a maximum height roughness Rz of the outer surface is 6 to 18 μm, and a peak vertex density Spd is 5.0×103 to 5.0×104(1/mm2).
Public/Granted literature
- US20200310282A1 DEVELOPING ROLLER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS Public/Granted day:2020-10-01
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