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    Developing method for an image forming apparatus and developing device using the same
    31.
    发明公开
    Developing method for an image forming apparatus and developing device using the same 审中-公开
    的图像形成装置和显影装置为此开发过程

    公开(公告)号：EP1333335A2

    公开(公告)日：2003-08-06

    申请号：EP02028161.4

    申请日：2002-12-19

    申请人： Ricoh Company, Ltd.

    发明人： Enoki, Shigekazu ,  Maruta, Takayuki

    IPC分类号： G03G15/08 ,  G03G13/09 ,  G03G15/095

    CPC分类号： G03G13/09

    摘要： A developing method and apparatus of the present invention develops a latent image formed on an image carrier (1) with a two-ingredient type developer, which consists of toner grains and carrier grains retaining the toner grains thereon, deposited on a developer carrier (111a) in the form of brush chains. Assume that the brush chains on the developer carrier has a height of h as measured at a zero field point where the magnetic field formed by a main magnet is zero, and that a gap for development that is the shortest distance between the developer carrier and the image carrier is a, then a and h are equal to each other. Image quality is estimated by varying the combination of an angle θ between the gap and the zero field point, the outside diameter of the image carrier and the outside diameter of the developer carrier and the height h. A desirable or an optimum range of the results of estimation are selected to set various conditions. A developing method is claimed which sets the toner grains free when the carrier grains start rising to form a brush along the magnetic line of force, due to the centrifugal force acting thereon. A mode of develepment is provided in which the toner grain present in a non-image portion of the image carier are returned toward the carrier grains forming the brush chains.

    Magnetic toner, apparatus unit and image forming method
    34.
    发明公开
    Magnetic toner, apparatus unit and image forming method 失效
    Magnetischer Toner，Geräteeinheitund Bilderzeugungsverfahren

    公开(公告)号：EP0822457A1

    公开(公告)日：1998-02-04

    申请号：EP97305715.1

    申请日：1997-07-30

    申请人： CANON KABUSHIKI KAISHA

    发明人： Tamura, Osamu ,  Tomiyama, Kochi ,  Okubo, Nobuyuki ,  Suzuki, Shunji ,  Ogawa, Yoshihiro ,  Nozawa, Keita

    IPC分类号： G03G9/083 ,  G03G9/08 ,  G03G13/09

    CPC分类号： G03G9/0835 ,  G03G9/0819 ,  G03G9/0821 ,  G03G9/0833 ,  G03G13/09

    摘要： Disclosed are a magnetic toner for developing an electrostatic latent image comprising magnetic toner particles containing a binder resin of 100 parts by weight and a magnetic substance of 20 to 150 pars by weight, and an apparatus unit and an image forming method for employing the magnetic toner. A frictional electrification property is such that the absolute value of the frictional electrification amount relative to an iron powder of 250 mesh-pass to 350 mesh-on is 25 to 40 mc/kg. Assuming that for particle distribution of the magnetic toner a weight-average particle diameter (D 4 ) for the magnetic toner is X (µm) and that a count% in a count distribution of magnetic toner particles that have a diameter of 3.17 µm or smaller is Y (%), expressions (1) and (2) are satisfied: -5X + 35 ≤ Y ≤ -25X + 180 3.5 ≤ X ≤ 6.5 Sphericity (ψ) of particles is equal to or greater than 0.80 and a product (σ r × H c ) of remanence [σ r (Am 2 /kg)] and coercive force (H c (kA/m)] of the magnetic substance in a magnetic field of 795.8 kA/m (10k oersted) is 10 to 56 (kA 2 m/kg).

    摘要翻译： 公开了用于显影静电潜像的磁性调色剂，其包含含有100重量份的粘合剂树脂和20至150重量份的磁性物质的磁性调色剂颗粒，以及用于使用磁性调色剂的装置单元和图像形成方法 。 摩擦带电特性使得摩擦带电量相对于250目通过至350目的铁粉的绝对值为25〜40mc / kg。 假设对于磁性调色剂的粒子分布，磁性调色剂的重均粒径（D4）为X（μm），磁性调色剂颗粒的计数分布的计数％为直径3.17μm，或 较小的是Y（％），表达式（1）和（2）满足： 颗粒的球形度（psi）等于或大于0.80，剩余ζ的产品（sigma rx Hc） （Am 2 / kg）Ü和在795.8kA / m（10k oersted）的磁场中的磁性物质的矫顽力（Hc（kA / m）Ü）为10至56（kA <2m / kg） 。