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    Development systems for magnetic toners and toners having reduced magnetic loadings
    1.
    发明公开
    Development systems for magnetic toners and toners having reduced magnetic loadings 有权
    用于磁性调色剂的调色剂和具有低磁性材料内容开发系统

    公开(公告)号：EP1220044A3

    公开(公告)日：2005-11-16

    申请号：EP01130250.2

    申请日：2001-12-19

    申请人： EASTMAN KODAK COMPANY

    发明人： Crichton, John F. ,  Fields, Robert D. ,  Jadwin, Thomas A. ,  Stelter, Eric C.

    IPC分类号： G03G13/09 ,  G03G9/083

    CPC分类号： B82Y15/00 ,  G03G9/083 ,  G03G9/097 ,  G03G9/09708 ,  G03G9/09733 ,  G03G13/09 ,  G03G2215/0013

    摘要： Development systems and methods for developing using magnetic toner are disclosed. The present invention further discloses developers used in development systems as well as the toner used in developer for magnetic ink character recognition printing. With respect to the development system, a development system is disclosed which includes a supply of dry developer mixture which contains magnetic toner particles and hard magnetic carrier particles. The development system further includes a non-magnetic, cylindrical shell for transporting the developer between the supply and the development zone, wherein the shell can be rotatable or stationary. A rotating magnetic core of a pre-selected magnetic field strength and means for rotating at least the magnetic core to provide for the transport of the toner particles from the shell to an electrostatic image also provided as part of the development system. A method for developing electrostatic image with magnetic toner is further disclosed, for example, involving the above-described development system. Magnetic toner particles having a low magnetic loading such as on the order of 28% by weight or less, based on the weight of the toner are further described wherein these magnetic toners can include a spacing agent on the surface of the magnetic toner particles. A developer is further disclosed which contains the magnetic toner particles of the present invention with hard magnetic carrier particles. Other developer compositions are also described.

    Electrostatographic image developing process with optimized setpoints
    4.
    发明公开
    Electrostatographic image developing process with optimized setpoints 有权
    具有最佳调节值显影的静电图像的方法

    公开(公告)号：EP1156377A3

    公开(公告)日：2004-11-10

    申请号：EP01111750.4

    申请日：2001-05-15

    申请人： Eastman Kodak Company

    发明人： Eck, Edward M. ,  Guth, Joseph Edward ,  Regelsberger, Matthias H. ,  Stelter, Eric C.

    IPC分类号： G03G13/09 ,  G03G15/09

    CPC分类号： G03G13/09

    摘要： The invention relates generally to processes for electrostatic image development, and setpoints that provide uniform image development. In particular, an apparatus and process having a magnetic brush that implements hard carriers and a rotating magnetic core within a shell is disclosed. The process implements one or more of the following optimum setpoints: a range of shell surface speeds that provide uniform toning density, a range of shell surface speeds that prevent toner plate-out, a skive spacing that minimizes sensitivity to variation, a magnetic core speed that minimizes sensitivity to variation, and an imaging member spacing that minimizes sensitivity to variation.