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:
Jan. 31, 2023
Filed:
Jan. 07, 2022
Canon Kabushiki Kaisha, Tokyo, JP;
Tomoyuki Sakamaki, Toride, JP;
Mitsuhiro Furukawa, Kawaguchi, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A developer carrying member of a developer apparatus includes a developer carrying surface having a plurality of grooves, wherein a depth D (mm) of the grooves, a width W (mm) of the grooves, and a volume average particle diameter of the magnetic carrier D(mm) satisfy, D (mm)>D(mm)×½, and W (mm)>D(mm), a magnet, provided inside the developer carrying member, attracts the developer on the developing carrying surface, and a regulating member, provided spaced from the developer carrying member, regulates an amount of the developer carried on the developer carrying surface. An amount M/S (mg/mm) of the developer carried on a unit area of the developer carrying surface after passing by the regulating member, a gap SB (mm) between a free end of the regulating member and the developer carrying member, a density G (mg/mm) of the developer, and a groove ratio α which is a ratio of the grooves in the developer carrying surface satisfy, 0.1≤M/S (mg/mm)≤0.45, 0.2≤SB (mm), and M/S (mg/mm)×¼≤α×{SB (mm)+D (mm)}×G (mg/mm)<23/30×M/S (mg/mm), and 0.06<α.