- Patent Title: Electrophotographic apparatus, process cartridge and cartridge set
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Application No.: US17071535Application Date: 2020-10-15
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Publication No.: US11360405B2Publication Date: 2022-06-14
- Inventor: Hiroyuki Tomono , Yoshitaka Suzumura , Takuya Mizuguchi , Osamu Matsushita , Masahiro Kurachi , Kazuhiro Yamauchi , Issei Imamura
- 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: JPJP2019-191592 20191018
- Main IPC: G03G15/02
- IPC: G03G15/02 ; G03G9/08

Abstract:
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging device and a developing device, wherein the charging device comprises a conductive member arranged to be capable of contacting the electrophotographic photosensitive member, the conductive layer at the outer surface of the conductive member comprises a matrix and a plurality of domains dispersed in the matrix, at least some of the domains are exposed at the outer surface of the conductive member, the matrix has a volume resistivity R1 of larger than 1.00×1012 Ω·cm, the volume resistivity R1 of the matrix is 1.0×105 times or more a volume resistivity R2 of the domains, the developing device comprises the toner comprising a toner particle and a silica fine particle, and a coverage ratio of the toner surface with the silica fine particles is from 62.0% by area to 100.0% by area as determined by X-ray photoelectron spectroscopy.
Public/Granted literature
- US20210116829A1 ELECTROPHOTOGRAPHIC APPARATUS, PROCESS CARTRIDGE AND CARTRIDGE SET Public/Granted day:2021-04-22
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