| 发明名称 | Developing device and image forming apparatus | ||
| 摘要 | A developing device includes a developing sleeve and a regulation portion. The developing sleeve includes a magnetism generating portion to which magnetic poles are attached. The developing sleeve holds a developer on an outer circumferential surface. The regulation portion includes a magnetic plate. A first segment connecting a peak position of the magnetic pole disposed at a position facing the magnetic plate and an axial center of the developing sleeve has an angle, with respect to a second segment connecting the magnetic plate and the axial center, equal to or less than 7 degrees on a downstream side in a rotation direction of the developing sleeve and equal to or less than 6 degrees on an upstream side in the rotation direction. An angle of a half value width of the magnetic pole is equal to or greater than 41 degrees to equal to or less than 52 degrees. | ||
| 申请公布号 | US9454104(B1) | 申请公布日期 | 2016.09.27 |
| 申请号 | US201614994880 | 申请日期 | 2016.01.13 |
| 申请人 | FUJI XEROX CO., LTD. | 发明人 | Urayama Kenta;Watanabe Yasuaki;Abe Jun;Yoshii Tomoyuki;Ochi Takashi;Okuyama Shinji;Honda Fumiyuki;Matsuda Shiho |
| 分类号 | G03G15/00;G03G15/09;G03G15/08 | 主分类号 | G03G15/00 |
| 代理机构 | Oliff PLC | 代理人 | Oliff PLC |
| 主权项 | 1. A developing device comprising: a developing sleeve that includes a magnetism generating portion therein, a plurality of magnetic poles being attached to the magnetism generating portion in a circumferential direction,holds a developer on an outer circumferential surface thereof, the developer containing a toner and magnetic carriers having a volume average diameter equal to or greater than 25 μm and equal to or less than 35 μm, andis rotatably driven; and a regulation portion that is disposed at a distance from the outer circumferential surface of the developing sleeve and that includes a magnetic plate, wherein a first segment connecting a peak position of the magnetic pole disposed at a position where the magnetic pole faces the magnetic plate and an axial center of the developing sleeve has an angle, with respect to a second segment connecting the magnetic plate and the axial center, equal to or less than 7 degrees on a downstream side in a rotation direction of the developing sleeve and equal to or less than 6 degrees on an upstream side in the rotation direction of the developing sleep, and wherein an angle of a half value width of the magnetic pole is equal to or greater than 41 degrees to equal to or less than 52 degrees. | ||
| 地址 | Tokyo JP | ||