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    • 10. 发明授权
    • Electrophotographic developing method
    • 电子照相显影法
    • US4672017A
    • 1987-06-09
    • US802022
    • 1985-11-25
    • Yasushi Kamezaki
    • Yasushi Kamezaki
    • G03G13/09G03G15/09
    • G03G13/09
    • A developing method for forming a toner image of high quality which comprises supplying a two-component developer composed of a mixture of magnetic carrier particles and toner particles chargeable by frictional contact with the magnetic carrier particles onto a development sleeve comprised of a non-magnetic sleeve and provided therein, a magnet having alternately and circumferentially arranged magnetic poles of different polarities to thereby form a magnetic brush of the developer, and bringing the surface of a photosensitive drum bearing a latent electrostatic image into frictional contact with the magnetic brush while a bias voltage is applied between the photosensitive drum and the sleeve thereby to form a toner image corresponding to the latent electrostatic image; characterized in that a brush cutting doctor is disposed on the non-magnetic sleeve so that the tip of the doctor is positioned nearly centrally between two magnetic poles of different polarities, and the development is carried out while moving the photo-sensitive drum and the development sleeve in the same direction at the site of frictional contact and the concentration (Ct, %) of the toner in the developer satisfies the following equation ##EQU1## wherein Sc is the specific surface area (cm.sup.2 /g) of the carrier, St is the specific surface area (cm.sup.2 /g) of the toner, and k is a number of from 0.80 to 1.14.
    • 一种用于形成高品质调色剂图像的显影方法,其包括将由磁性载体颗粒的混合物组成的双组分显影剂和通过与磁性载体颗粒摩擦接触而可带电的调色剂颗粒提供到由非磁性套筒 并且在其中设置有具有不同极性的交替地且周向地布置的磁极的磁体,从而形成显影剂的磁刷,并且使带有静电潜像的感光鼓的表面与磁刷摩擦接触,同时偏置电压 施加在感光鼓和套筒之间,从而形成对应于静电潜像的调色剂图像; 其特征在于,在所述非磁性套筒上设置有刷切割刮刀,使得所述刮刀的尖端位于两个不同极性的磁极之间的中心位置,并且在移动所述感光鼓的同时进行显影 在摩擦接触部位处于相同方向的套筒,并且显影剂中调色剂的浓度(Ct,%)满足以下等式其中Sc是载体的比表面积(cm2 / g),St是 调色剂的比表面积(cm 2 / g),k为0.80〜1.14的数。