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    • 60. 发明申请
    • Image forming apparatus and charging unit therefor
    • 图像形成装置及其充电装置
    • US20050135839A1
    • 2005-06-23
    • US11001020
    • 2004-12-02
    • Ryo Inoue
    • Ryo Inoue
    • G03G5/08G03G5/147G03G15/00G03G15/02
    • G03G15/0241G03G2215/022
    • An image forming apparatus includes an image bearing member, and first and second chargers. Each of the chargers includes a magnetic member for generating magnetism, has a holding member for holding magnetic particles by a magnetic force, and charges the image bearing member by bringing the magnetic particles in contact therewith. The magnetic member of each of the chargers has a magnetic pole facing the image bearing member. The second charger is located at the tail end in the image bearing member rotational direction, but before a position at which an image is formed on the image bearing member. In the image bearing member rotation direction, and relative to a position at which the image bearing member comes closest to the holding member, the first charger's magnetic member has a peak magnetic force positioned downstream, and the second charger's magnetic member has a peak magnetic force positioned upstream.
    • 图像形成装置包括图像承载部件和第一和第二充电器。 每个充电器包括用于产生磁性的磁性构件,具有用于通过磁力保持磁性颗粒的保持构件,并且通过使磁性颗粒接触而对图像承载构件进行充电。 每个充电器的磁性构件具有面向图像承载部件的磁极。 第二充电器位于图像承载部件旋转方向的尾端,但位于图像承载部件上形成图像的位置之前。 在图像承载部件旋转方向上,相对于图像承载部件最靠近保持部件的位置,第一充电器的磁性部件具有位于下游的峰值磁力,第二充电器的磁性部件具有峰值磁力 位于上游。