The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 2022
Filed:
Oct. 14, 2020
Canon Kabushiki Kaisha, Tokyo, JP;
Yuka Ishiduka, Shizuoka, JP;
Tsutomu Nishida, Shizuoka, JP;
Hideharu Shimozawa, Shizuoka, JP;
Nobuhiro Nakamura, Shizuoka, JP;
Hiroyuki Watanabe, Shizuoka, JP;
Kenichi Kaku, Suntou-gun, JP;
Kazuhiro Yamauchi, Suntou-gun, JP;
Yuichi Kikuchi, Suntou-gun, JP;
Kazuhisa Shida, Kawasaki, JP;
Atsushi Okuda, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
There is provided a process cartridge detachably attachable to a main body of an electrophotographic apparatus, the process cartridge including an electrophotographic photosensitive member and a charging member, wherein an outer surface of the charging member is composed of at least a matrix and at least a part of domains, a volume resistivity of the matrix is 1.0×10times or more of a volume resistivity of the domain, an average value Sd of circle equivalent diameters of the domains observed on the outer surface of the charging member is in a predetermined range, the electrophotographic photosensitive member contains a support, a photosensitive layer, and a protective layer in this order and when a surface roughness of the protective layer is measured, each of a protruding valley portion Rvk, a load length ratio Mr2, and Sd/Rvk is in a predetermined range.