公开(公告)号：US12001156B2

公开(公告)日：2024-06-04

申请号：US18023977

申请日：2020-12-15

申请人： Hewlett-Packard Development Company, L.P.

发明人： Seungchan Park ,  Jungho Roh ,  Myeongdong Kim ,  Donguk Kim ,  Youngkwang Shin

IPC分类号： G03G15/09 ,  G03G15/08

CPC分类号： G03G15/0928 ,  G03G15/0818

摘要： In some examples, a developing device includes a developing container including an opening and to store a developer, a developing sleeve installed in the developing container and partially exposed to an outside of the developing container through the opening, a regulation member upstream of the opening in a rotation direction of the developing sleeve and to regulate an amount of the developer adhered to the developing sleeve and supplied to the opening, and a magnetic member inside the developing sleeve. The magnetic member includes a main pole facing the opening, a regulation pole facing the regulation member, and a catch pole upstream of the regulation pole in the rotation direction of the developing sleeve. The magnetic member is to cause adhesion of the developer in the developing container to the developing sleeve. At least one of lengths of the catch pole or the regulation pole and diameters of both end portions of the catch pole or the regulation pole are less than a length and a diameter, respectively, of the main pole.