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:
Jul. 08, 2025
Filed:
Jul. 27, 2022
Canon Kabushiki Kaisha, Tokyo, JP;
Akihiro Maruyama, Shizuoka, JP;
Kenichi Kaku, Shizuoka, JP;
Shuhei Iwasaki, Kanagawa, JP;
Kohei Makisumi, Shizuoka, JP;
Michiyo Sekiya, Shizuoka, JP;
Kaname Watariguchi, Kanagawa, JP;
Hideharu Shimozawa, Tokyo, JP;
Tatsuya Yamaai, Kanagawa, JP;
Takanori Mitani, Kanagawa, JP;
Satoshi Nishida, Kanagawa, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
The electrophotographic apparatus includes: an electrophotographic photosensitive member; a charging unit; an image-exposing unit; a charge transfer amount-sensing unit for sensing the amount of charge transferred to the electrophotographic photosensitive member; and an exposed portion potential-controlling unit for controlling the potential of each of the exposed portions of the electrophotographic photosensitive member based on a sensing result, which is obtained by charging the electrophotographic photosensitive member with the charging unit, performing image exposure with the image-exposing unit in at least one light amount weaker than a light amount in which the normalized radius of curvature R of the electrophotographic photosensitive member represented by the following equation (E1), the normalized radius of curvature being obtained by a method of measuring an EV curve, shows a minimum, and in at least two light amounts stronger than the light amount in which the normalized radius of curvature shows the minimum.