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. 16, 2026
Filed:
Feb. 05, 2024
Canon Kabushiki Kaisha, Tokyo, JP;
Shunsuke Mizukoshi, Tokyo, JP;
Yusuke Shimizu, Kanagawa, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An image forming apparatus includes a controller to perform a preparation operation before start of image formation so that rotation of an image bearing member is started while in contact with a developing member, and a charging voltage and a developing voltage are changed stepwise respectively so that a potential difference between a surface potential of the image bearing member and the developing voltage in a developing portion becomes a predetermined value. The controller changes the charging voltage to a voltage of the same polarity as during the image formation and an absolute value thereof lower than a discharge start voltage from a state in which the charging voltage is not applied to the charging member, and then changes the charging voltage to a plurality of values of the same polarity as during the image formation and the absolute value thereof equal to or greater than the discharge start voltage.