- Patent Title: Electrophotographic image forming apparatus and process cartridge
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Application No.: US16815485Application Date: 2020-03-11
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Publication No.: US11003102B2Publication Date: 2021-05-11
- Inventor: Yuka Ishiduka , Tsutomu Nishida , Hideharu Shimozawa , Nobuhiro Nakamura , Hiroyuki Watanabe
- Applicant: CANON KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: CANON KABUSHIKI KAISHA
- Current Assignee: CANON KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Agency: Venable LLP
- Priority: JPJP2019-049031 20190315
- Main IPC: G03G5/05
- IPC: G03G5/05 ; G03G5/147 ; G03G9/08 ; G03G9/087 ; G03G9/09 ; G03G9/097 ; G03G15/08 ; G03G21/18

Abstract:
Provided are an electrophotographic apparatus and a process cartridge each capable of suppressing the occurrence of a black spot (white background contamination) in an output image under a low-temperature and low-humidity environment. The electrophotographic apparatus includes: an electrophotographic photosensitive member including a support, a photosensitive layer, and a protective layer in the stated order; an exposing device; a developing device; and a cleaning device, wherein the protective layer has a triarylamine structure and a specific structure at a ratio in a specific range, and a toner contains toner particles each containing at least a resin, and an external additive. The toner has a volume-average particle diameter of 7 μm or more. The external additive contains a compound containing a titanium atom. The ratio of the mass of the compound containing a titanium atom to the total mass of the toner is 0.6 mass % or more.
Public/Granted literature
- US20200292949A1 ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE Public/Granted day:2020-09-17
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