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    • 4. 发明授权
    • Developing device and magnet roller for developing device
    • 用于显影装置的显影装置和磁辊
    • US06330415B1
    • 2001-12-11
    • US09577156
    • 2000-05-24
    • Tsuyoshi ImamuraKyohta KoetsukaKenichi Ishiguro
    • Tsuyoshi ImamuraKyohta KoetsukaKenichi Ishiguro
    • G03G1509
    • B82Y15/00G03G15/0921
    • A developing device which prevents bias of a developer caused by an axial magnetic force of a magnet roller, and which can form an image uniform in the axial direction; and a magnet roller for a developing device which is used in the above developing device and is reduced in axial magnetic force. The developing device includes a rotatable sleeve which carries a developer on the surface thereof, a fixed magnet roller which is provided within the sleeve and has a plurality magnetic poles, and a doctor blade which controls the amount of developer carried on the sleeve. The developing device is constructed so that among the plurality of magnetic poles of the magnet roller, the ratio of the axial magnetic flux density to the radial magnetic flux density of a magnetic pole opposing the doctor blade is 2.5/100 or less in a central portion in the axial direction.
    • 一种防止由磁辊的轴向磁力引起的显影剂的偏压并且可以在轴向上形成均匀的显影装置; 以及用于上述显影装置中并减小轴向磁力的显影装置用磁辊。 显影装置包括:可旋转套筒,其在其表面上承载显影剂;固定磁辊,其设置在套筒内并具有多个磁极;以及刮刀,其控制在套筒上承载的显影剂的量。 显影装置被构造成使得在磁辊的多个磁极中,与刮刀相对的磁极的轴向磁通密度与径向磁通密度之比在中心部分为2.5 / 100或更小 在轴向上。