US 12,001,156 B2
Developing device with magnetic member having plurality of magnetic poles
Seungchan Park, Seongnam-si (KR); Jungho Roh, Seongnam-si (KR); Myeongdong Kim, Seongnam-si (KR); Donguk Kim, Seongnam-si (KR); and Youngkwang Shin, Seongnam-si (KR)
Assigned to Hewlett-Packard Development Company, L.P., Spring, TX (US)
Appl. No. 18/023,977
Filed by Hewlett-Packard Development Company, L.P., Spring, TX (US)
PCT Filed Dec. 15, 2020, PCT No. PCT/US2020/064990
§ 371(c)(1), (2) Date Feb. 28, 2023,
PCT Pub. No. WO2022/050971, PCT Pub. Date Mar. 10, 2022.
Claims priority of application No. 10-2020-0110791 (KR), filed on Sep. 1, 2020.
Prior Publication US 2024/0027938 A1, Jan. 25, 2024
Int. Cl. G03G 15/09 (2006.01); G03G 15/08 (2006.01)
CPC G03G 15/0928 (2013.01) [G03G 15/0818 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A developing device comprising:
a developing container to store a developer and comprising an opening;
a developing sleeve installed in the developing container and partially exposed to an outside of the developing container through the opening;
a regulation member located upstream of the opening in a rotation direction of the developing sleeve, the regulation member to regulate an amount of the developer adhered to the developing sleeve and supplied to the opening; and
a magnetic member located inside the developing sleeve and comprising a main pole facing the opening, a regulation pole facing the regulation member, and a catch pole located upstream of the regulation pole in the rotation direction of the developing sleeve, the catch pole to cause adhesion of the developer in the developing container to the developing sleeve, wherein:
at least one of a length of the catch pole or a length of the regulation pole is less than a length of the main pole, and
at least one of diameters of end portions of the catch pole or diameters of end portions of the regulation pole are less than a diameter of the main pole.