公开(公告)号：US12055873B2

公开(公告)日：2024-08-06

申请号：US18455662

申请日：2023-08-25

申请人： KYOCERA Document Solutions Inc.

发明人： Masashi Fujishima ,  Tamotsu Shimizu ,  Asami Sasaki ,  Eriko Takeuchi

IPC分类号： G03G15/08 ,  G03G9/08 ,  G03G9/113 ,  G03G15/09

CPC分类号： G03G15/0891 ,  G03G9/0823 ,  G03G9/1139 ,  G03G15/0898 ,  G03G15/0907 ,  G03G15/0848 ,  G03G2215/0619 ,  G03G2215/0634

摘要： An image forming apparatus includes a developer, a development device, and an image bearing member. The developer includes an initial developer containing an initial carrier and a replenishment developer containing a replenishment carrier. The initial carrier has a surface roughness Sa1 of at least 0.3 μm and no greater than 1.0 μm. A ratio Sa1/Sa2 of the surface roughness Sa1 of the initial carrier to a surface roughness Sa2 of the replenishment carrier is at least 1.2 and no greater than 3.4. The packing volume Vp calculated from equation (1)“Vp=100×Y/(Z×DS)” was at least 40% and no greater than 70%. In equation (1), Y represents an amount of the developer conveyed by a developer bearing member. Z represents an apparent density of the initial developer. DS represents a width of a space between the developer bearing member and the image bearing member.