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. 07, 2020
Filed:
Apr. 25, 2019
Canon Kabushiki Kaisha, Tokyo, JP;
Koji Shigehiro, Kashiwa, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A developing device includes a rotatable developer carrying member, a developer regulating member, and a cylindrical magnetic field generating member provided inside the developer carrying member and including a regulating magnetic pole provided opposed to the developer regulating member. A magnetic flux distribution provided by the regulating magnetic pole includes a first local maximum portion on a side upstream of a closest position between the magnetic field generating member and the developer regulating member, a second local maximum portion on a side downstream of the closest position, and a local minimum portion between the first local maximum portion and the second local maximum portion. A rectilinear line connecting the closest position and a center of the magnetic field generating member is positioned between the first local maximum portion and the second local maximum portion.