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:
Sep. 20, 2022
Filed:
Oct. 15, 2020
Canon Kabushiki Kaisha, Tokyo, JP;
Tsuneyoshi Tominaga, Shizuoka, JP;
Shohei Tsuda, Shizuoka, JP;
Shohei Kototani, Shizuoka, JP;
Noriyoshi Umeda, Shizuoka, JP;
Masahiro Kurachi, Shizuoka, JP;
Kazuhiro Yamauchi, Shizuoka, JP;
Motonari Ito, Shizuoka, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An electrophotographic apparatus including an electrophotographic photosensitive member, a charging unit, and a developing unit, wherein the charging unit includes a conductive member disposed to be contactable with the electrophotographic photosensitive member, a conductive layer of the conductive member has a matrix-domain structure, at least some of the domains are exposed at the outer surface of the conductive member, the volume resistivity RI of the matrix is greater than 1.00×10Ω·cm and not greater than 1.00×10Ω·cm, the matrix volume resistivity R1 is at least 1.0×10-times the domain volume resistivity R2, and the developing unit includes a toner, the toner includes a binder resin-containing toner particle and an external additive, and the external additive contains fine particles of a hydrotalcite compound.