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    • 4. 发明授权
    • External addition toner, apparatus for forming image, and process for forming image
    • 外部添加调色剂,用于形成图像的装置和用于形成图像的工艺
    • US06214510B1
    • 2001-04-10
    • US09645353
    • 2000-08-25
    • Noriaki KojimaHiroyuki KoideKazuhisa MasukoTakatoshi Ishikawa
    • Noriaki KojimaHiroyuki KoideKazuhisa MasukoTakatoshi Ishikawa
    • G03G9097
    • G03G9/097G03G9/0819G03G9/0827G03G13/08G03G2215/0177
    • An external addition toner that sufficiently exhibits the effect of an external additive and is excellent in transfer property, and an apparatus for forming an image and a process for forming an image excellent in general purpose property that provide an image of good quality without formation of image defects, such as transfer unevenness and drop off due to transfer failure of the toner. An external addition toner is employed, in which the shape coefficient of the toner particles, as well as a coating ratio x (%) of the external additive to a surface area of the toner particles, a volume average particle diameter D (&mgr;m) of the toner particles and a volume average particle diameter d (&mgr;m) of the external additive having the maximum average particle diameter satisfy the prescribed relationship. Furthermore, a developer is employed, which contains a toner charged to a charge amount q (&mgr;C/g) satisfying the following equation corresponding to the volume average particle diameter D (&mgr;m) of the toner particles: q≧929.5/D2
    • 充分展现外部添加剂的效果并且转印性优异的外部添加调色剂,以及形成图像的装置和形成图像质量优异的图像的方法,提供高质量的图像而不形成图像 由于调色剂的转印失败导致的转印不均匀和脱落等缺陷。 使用外部添加调色剂,其中调色剂颗粒的形状系数以及外部添加剂与调色剂颗粒的表面积的涂布比x(%),体积平均粒径D(母体) 调色剂颗粒和具有最大平均粒径的外部添加剂的体积平均粒径d(母体)满足规定的关系。 此外,使用显影剂,其包含充满电量q(μC/ g)的调色剂,其满足对应于调色剂颗粒的体积平均粒径D(母体)的下列等式: