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    • 8. 发明授权
    • Irregular shaped ferrite carrier and electrophotographic developer using the ferrite carrier
    • 不规则形状的铁氧体载体和使用铁素体载体的电子照相显影剂
    • US07598011B2
    • 2009-10-06
    • US11363262
    • 2006-02-28
    • Hiromichi KobayashiToru IwataToshio Honjo
    • Hiromichi KobayashiToru IwataToshio Honjo
    • G03G9/107
    • G03G9/107G03G9/1132
    • It is contemplated to provide irregular shaped ferrite carrier which has a lower resistance, a high specific surface area, a low specific gravity and a longer operational life, and an electrophotographic developer comprising the ferrite carrier which prevents the toner scattering, has a high image density, and is responsive to high-speed and color imaging. The irregular shaped ferrite carrier is characterized in that the carrier particles are irregular shaped, and 40 percent by number or more of the particles have a rock candy sugar shape and/or an oyster shell shape, and that the shape factor (SF-1=R2/S×π/4×100, wherein R is a maximum length and S is a projected area.) is 140 to 250, and the distribution width (δ) is 60 or less.
    • 考虑到提供具有较低电阻,高比表面积,低比重和较长使用寿命的不规则形状的铁氧体载体,以及包含防止调色剂飞散的铁氧体载体的电子照相显影剂具有高图像密度 ,并且响应于高速和彩色成像。 不规则形状的铁氧体载体的特征在于,载体颗粒是不规则形状,并且40个数量以上的颗粒具有岩糖糖糖形状和/或牡蛎壳形状,并且形状因子(SF-1 = R2 / Sxpi / 4x100,其中R是最大长度,S是投影面积)为140〜250,分布宽度(delta)为60以下。