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    • 2. 发明授权
    • Image forming apparatus that prevents conspicuous unevenness in image density
    • 防止图像浓度显着不均匀的图像形成装置
    • US07555252B2
    • 2009-06-30
    • US11623669
    • 2007-01-16
    • Tomohiro ArugaYoichi YamadaNoboru SakuraiTakatomo Fukumoto
    • Tomohiro ArugaYoichi YamadaNoboru SakuraiTakatomo Fukumoto
    • G03G15/08
    • G03G15/0818
    • An image forming apparatus includes: an image bearing body that is rotatable about a central axis thereof, and that bears a dot-like latent image, on a surface of the image bearing body, in each of a plurality of divided regions that are arranged in rows along a direction that intersects an axial direction of the central axis at a predetermined intersection angle; and a developer bearing roller that is rotatable in order to make visible, as a developer image, the dot-like latent images borne by the image bearing body, using a developer borne on a surface of the developer bearing roller, the developer bearing roller opposing the image bearing body such that an axial direction of the developer bearing roller is parallel to the axial direction of the image bearing body, and that includes a helical groove portion on the surface of the developer bearing roller, the helical groove portion being inclined at a predetermined inclination angle with respect to the axial direction of the developer bearing roller and being formed having a uniform pitch in the axial direction, wherein a value that is a tangent of the inclination angle divided by a ratio of a moving speed of the surface of the developer bearing roller to a moving speed of the surface of the image bearing body is different from a tangent of the intersection angle.
    • 图像形成装置包括:图像承载体,其能够围绕其中心轴线旋转并且在图像承载体的表面上具有点状潜像,所述图像承载体分布在多个分割区域中 沿着与中心轴的轴向相交的方向以预定的交叉角度排列; 以及显影剂承载辊,其可旋转以使作为显影剂图像可见的由图像承载体承载的点状潜像,使用承载在显影剂承载辊的表面上的显影剂,显影剂承载辊相对于 所述图像承载体使得所述显影剂承载辊的轴向平行于所述图像承载体的轴向方向,并且所述图像承载体在所述显影剂承载辊的表面上包括螺旋槽部分,所述螺旋槽部分倾斜于 相对于显影剂承载辊的轴向的预定倾斜角度并且在轴向方向上具有均匀的间距,其中,倾斜角的切线值除以所述倾斜角度的表面的移动速度的比率 显影轴承辊与图像承载体的表面的移动速度不同于交叉角的切线。