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. 10, 2025
Filed:
Jul. 29, 2022
Canon Kabushiki Kaisha, Tokyo, JP;
Kenichi Kaku, Shizuoka, JP;
Akihiro Maruyama, Shizuoka, JP;
Shuhei Iwasaki, Kanagawa, JP;
Tatsuya Yamaai, Kanagawa, JP;
Kaname Watariguchi, Kanagawa, JP;
Michiyo Sekiya, Shizuoka, JP;
Kohei Makisumi, Shizuoka, JP;
Hideharu Shimozawa, Tokyo, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
Provided is an electrophotographic apparatus which uses a light emitting diode array as an exposure unit and exposes a photosensitive member to a quantity of light from the LED array whose average light quantity satisfies 0.8×E min or more and 1.1×E min or less on condition that a normalized radius of curvature R of a normalized graph derived from the E-V curve of the photosensitive member has a minimum value of 0.24 or less, and a light quantity at the minimum value of the normalized radius of curvature R is E min [μJ/cm]. This electrophotographic apparatus prevents both the occurrence of image unevenness due to light quantity variation among the elements of the LED array and the generation of ghost images due to a rest potential.