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:
Sep. 03, 2024
Filed:
Jun. 22, 2023
Canon Kabushiki Kaisha, Tokyo, JP;
Kyosuke Takahashi, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes an image bearing member, a developing device, first and second drive portions, and a controller. The developing device includes first, second, and third conveying screws, and a developer bearing member. A ratio of a rotational driving speed (Vsc) of the first and second conveying screws by the first drive portion to a rotational driving speed (Vs1) of the developer bearing member by the second drive portion is Vsc/Vs1. A ratio of a rotational driving speed (Vsc3) of the third conveying screw by the second drive portion to the developer bearing member rotational driving speed (Vs1) is Vsc3/Vs1. In a control mode, the controller controls the first and second drive portions so that Vsc/Vs1 in a non-image forming period becomes less than Vsc/Vs1 in an image forming period such that Vsc3/Vs1 in the non-image forming period is equal to Vsc3/Vs1 in the image forming period.