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:
Dec. 14, 2021
Filed:
Jun. 03, 2020
Canon Kabushiki Kaisha, Tokyo, JP;
Jun Shirayanagi, Ushiku, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A developing apparatus includes a developer bearing member, a first conveyance screw arranged in a first chamber to convey developer in a first direction, and a second conveyance screw arranged in a second chamber convey the developer in an opposite second direction. A toner density detector is arranged in the second chamber to detect toner density of the developer in a circulation path. The second conveyance screw includes a first blade portion having a helical shape, a second blade portion having a helical shape of a same turn direction as the first blade portion, a gap portion provided between the first and second blade portions, and a plurality of agitating portions provided in the gap portion. Each of the agitating portions has a wall portion provided to intersect a rotational axis direction of the second conveyance screw and a recessed portion having a shape in which a portion of a periphery of the wall portion is recessed.