公开(公告)号：US11874615B2

公开(公告)日：2024-01-16

申请号：US17859669

申请日：2022-07-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Akihiro Watanabe ,  Ryo Yamada ,  Uto Syu ,  Yuji Toyota ,  Yasuhiro Tauchi

IPC: G03G15/08 ,  G03G15/09

CPC classification number: G03G15/0891 ,  G03G15/081 ,  G03G15/0921 ,  G03G2215/0609

Abstract: A developing device includes a developing container, a first stirring conveyance member, a second stirring conveyance member, a developer carrying member including a developing sleeve and a magnet, and a regulation member. The regulation pole in the magnet has a region extending over 10° or more in which a maximum value of a vertical magnetic force is not more than 65 [mT] and a vertical magnetic force gradient is not more than 0.3 [mT/°]. A peak position of the vertical magnetic force gradient of the regulation pole is arranged at a position opposed to the second stirring conveyance member, and when a value of the vertical magnetic force gradient and a value of the vertical magnetic force at the peak position of the vertical magnetic force gradient are indicated as A [mT/°] and K [mT], respectively, A≥2.8 and A×K≥62.5 are satisfied.