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    • 1. 发明授权
    • Ferrite carrier for electrophotographic development
    • 用于电子照相显影的铁氧体载体
    • US5789129A
    • 1998-08-04
    • US769432
    • 1996-12-19
    • Masahisa OchiaiTsutomu Saitoh
    • Masahisa OchiaiTsutomu Saitoh
    • G03G9/107
    • G03G9/107
    • A ferrite carrier for use in electrophotographic development of electrostatic latent images, which comprises a ferrite particles having an average particle size of 10 to 100 .mu.m, a specific resistivity of 10.sup.6 .OMEGA..cm or more and a chemical composition represented by the following formula: ((MO).sub.Y (Li.sub.2 O).sub.1-Y).sub.1-X (Fe.sub.2 O.sub.3).sub.X wherein M is at least one metal selected from the group consisting of Mn, Ni, Zn, Cu, Co, Mg and Ba, Y is a number of 0 to 1, and (1-X)/X is 1.23 to 3. A magnetization intensity (.sigma..sub.1000) of the ferrite particle is 10 to 30 emu/g at 1000 Oe of a magnetic field strength, and a ratio (.sigma..sub.500 /.sigma..sub.S) of a magnetization intensity (.sigma..sub.500) of the ferrite particle and a saturation magnetization (.sigma..sub.S) of the ferrite particle is 0.5 or more.
    • 一种用于静电潜像的电子照相显影的铁氧体载体,其包含平均粒径为10〜100μm的铁素体颗粒,电阻率为10 6Ω·Ω·cm以上,以及由下式表示的化学组成: ((MO)Y(Li2O)1-Y)1-X(Fe2O3)X其中M是选自Mn,Ni,Zn,Cu,Co,Mg和Ba中的至少一种金属,Y是 0〜1,(1-X)/ X为1.23〜3。铁氧体颗粒的磁化强度(σ1000)在1000Oe的磁场强度为10〜30emu / g, 铁氧体颗粒的磁化强度(σ500)和铁素体颗粒的饱和磁化强度(sigma S)为0.5以上。
    • 5. 发明授权
    • Method of forming image using magnetic developer with high volume
resistivity
    • 使用具有高体积电阻率的磁性显影剂形成图像的方法
    • US5565967A
    • 1996-10-15
    • US498603
    • 1995-07-06
    • Masahisa OchiaiTsutomu SaitohMasumi Asanae
    • Masahisa OchiaiTsutomu SaitohMasumi Asanae
    • G03G9/08G03G9/10G03G13/09G03G15/08G03G15/09
    • G03G15/0921G03G13/09G03G9/10
    • An image forming method includes the steps of charging a surface of a movable image-bearing member uniformly by using a roller charging means, forming an electrostatic latent image on the image-bearing member by carrying out an image exposure, delivering a magnetic developer which is attracted onto a surface of a sleeveless permanent magnetic member to a developing region located opposite to the electrostatic latent image formed on the image-bearing member, the sleeveless permanent magnetic member being formed with a plurality of magnetic poles provided on its surface and having a cylinder shape, developing the electrostatic latent image using the magnetic developer comprising a toner and magnetic carriers, the magnetic carriers having a volume resistivity of 10.sup.10 .OMEGA..cm or more, and transferring a toner image onto a transfer sheet by using a roller transfer means.
    • 图像形成方法包括以下步骤:通过使用辊充电装置均匀地对可移动图像承载部件的表面进行充电,通过进行图像曝光在图像承载部件上形成静电潜像,输送磁性显影剂, 被吸引到位于与图像承载部件上形成的静电潜像相对的显影区域的无袖永磁部件的表面上,无磁永磁部件形成有设置在其表面上的多个磁极,并且具有圆筒 形状,使用包括调色剂和磁性载体的磁性显影剂显影静电潜像,磁性载体的体积电阻率为1010ΩEG·cm以上,并通过使用辊转移装置将调色剂图像转印到转印片材上。
    • 8. 发明授权
    • Carrier for magnetic developer and method of electrophotographically
forming visual image
    • 用于磁性显影剂的载体和电子照相形成视觉图像的方法
    • US6134413A
    • 2000-10-17
    • US962265
    • 1997-10-31
    • Masumi AsanaeTsutomu SaitohTakashi Hayano
    • Masumi AsanaeTsutomu SaitohTakashi Hayano
    • G03G9/113G03G15/08G03G15/34G03G15/09
    • G03G9/113G03G15/344G03G9/1136G03G9/1139G03G2217/0091
    • A magnetic carrier for a developer used in electrostatically forming a visual image, comprising a magnetic core material, an electrically-conductive particle-containing resin layer and electrically-conductive particles externally added to the electrically-conductive particle-containing resin layer, the magnetic carrier having a magnetization (.sigma..sub.1000) of 61-100 emu/g at 1 kOe magnetic field, a specific volume resistance of 10.sup.6 .OMEGA..multidot.cm or less, and an average particle size of 10-100 .mu.m. The magnetic carrier of low specific volume resistance has a high durability and provides high quality images. In particular, when the magnetic carrier is applied to an image forming process by rear side exposure, the residual toner on the image-bearing member can be effectively removed without using an additional cleaning means, and high quality images free from the background fogging and contamination can be produced.
    • 用于静电形成视觉图像的显影剂的磁性载体,包括磁性材料,导电颗粒的树脂层和外部添加到导电颗粒的树脂层中的导电颗粒,磁性载体 在1kOe磁场下具有61-100emu / g的磁化强度(σ1000),106ΩEGEGAxcm以下的比体积电阻和10-100μm的平均粒径。 低体积电阻的磁性载体具有高耐久性,并提供高质量的图像。 特别地,当通过背面曝光将磁性载体施加到图像形成处理时,可以有效地去除图像承载部件上的残留调色剂而不使用附加的清洁装置,并且高质量的图像没有背景雾化和污染 可以生产。