公开(公告)号：US5516613A

公开(公告)日：1996-05-14

申请号：US352721

申请日：1994-12-02

申请人： Masumi Asanae ,  Masahisa Ochiai ,  Tsutomu Saitoh

发明人： Masumi Asanae ,  Masahisa Ochiai ,  Tsutomu Saitoh

IPC分类号： G03G9/083 ,  G03G9/10 ,  G03G9/107

CPC分类号： G03G9/10 ,  G03G9/083 ,  G03G9/107 ,  G03G2215/0609

摘要： A binary developer is composed of a carrier and a magnetic toner. The carrier consists of nonspherically formed magnetic particles having an average diameter of 5 to 100 .mu.m, preferably 5 to 50 .mu.m. The magnetic toner is formed to have an average particle diameter of 10 .mu.m or less and a saturated magnetization .sigma..sub.s of 50 emu/g or less.

摘要翻译： 二元显影剂由载体和磁性调色剂组成。 载体由平均直径为5至100μm，优选5至50μm的非形式形成的磁性颗粒组成。 磁性调色剂的平均粒径为10μm以下，饱和磁化σs为50emu / g以下。

公开(公告)号：US5900343A

公开(公告)日：1999-05-04

申请号：US905956

申请日：1997-08-05

申请人： Masahisa Ochiai ,  Masumi Asanae ,  Tsutomu Saitoh

发明人： Masahisa Ochiai ,  Masumi Asanae ,  Tsutomu Saitoh

IPC分类号： G03G9/107

CPC分类号： G03G9/107

摘要： An Li--Mn type ferrite carrier for use in electrophotographic development comprising ferrite particles having a chemical composition of 3 to 15% of Li.sub.2 O, 5 to 35% of MnO and 60 to 90% of Fe.sub.2 O.sub.3, each in terms of percent by mole. The ferrite particles consisting essentially of crystal grains having an average grain size of 1 to 50 .mu.m. The surface of the crystal grains is provided with a minute roughness or unevenness during the production of the ferrite carrier. The minute roughness on the grain surface enhances the ability of the ferrite carrier to triboelectrically charge the toner and the bonding strength of the resin coating to the carrier surface.

摘要翻译： 一种用于电子照相显影的Li-Mn型铁氧体载体，其包含化学组成为Li 2 O 3〜15％，MnO 5〜35％，Fe 2 O 3 60〜90％的铁氧体颗粒。 铁素体颗粒基本上由平均粒径为1至50μm的晶粒组成。 在制造铁氧体载体时，晶粒表面具有微小的粗糙度或不均匀性。 颗粒表面上的微小粗糙度增强了铁氧体载体对调色剂进行摩擦电荷的能力以及树脂涂层与载体表面的粘结强度。

公开(公告)号：US5565967A

公开(公告)日：1996-10-15

申请号：US498603

申请日：1995-07-06

申请人： Masahisa Ochiai ,  Tsutomu Saitoh ,  Masumi Asanae

发明人： Masahisa Ochiai ,  Tsutomu Saitoh ,  Masumi Asanae

IPC分类号： G03G9/08 ,  G03G9/10 ,  G03G13/09 ,  G03G15/08 ,  G03G15/09

CPC分类号： G03G15/0921 ,  G03G13/09 ,  G03G9/10

摘要： 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.

摘要翻译： 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。

公开(公告)号：US5547795A

公开(公告)日：1996-08-20

申请号：US492866

申请日：1995-06-20

申请人： Masahisa Ochiai ,  Tsutomu Saitoh ,  Masumi Asanae

发明人： Masahisa Ochiai ,  Tsutomu Saitoh ,  Masumi Asanae

IPC分类号： G03G9/107 ,  G03G9/113

CPC分类号： G03G9/107 ,  G03G9/113 ,  G03G9/1133 ,  G03G9/1135 ,  G03G9/1136 ,  G03G2215/0609

摘要： A magnetic carrier for a developer for use in electrophotographic recording, comprising a ferromagnetic particle of an average particle size of 100 .mu.m or less, a ratio (T/a) of the minimum outer size (T) and the maximum outer size (a) of the magnetic carrier being 0.02-0.5. Since the magnetic carrier has a large specific surface area, a toner can be sufficiently charged by the magnetic toner. Therefore, a high quality printed image free from defect such as fogging, spreadness, carrier adhesion, streak, etc. can be obtained even in continuous printing of a long period of time.

摘要翻译： 一种用于电子照相记录的显影剂的磁性载体，包括平均粒度为100μm以下的铁磁性颗粒，最小外径（T）和最大外径（A）的比（T / a） ）为0.02-0.5。 由于磁性载体具有大的比表面积，所以可通过磁性调色剂使调色剂充分充电。 因此，即使在长时间的连续打印中也可以获得没有诸如雾化，蔓延，载体附着，条纹等缺陷的高质量印刷图像。

公开(公告)号：US5876893A

公开(公告)日：1999-03-02

申请号：US805609

申请日：1997-02-25

申请人： Masahisa Ochiai ,  Masumi Asanae ,  Tsutomu Saitoh ,  Takashi Hayano

发明人： Masahisa Ochiai ,  Masumi Asanae ,  Tsutomu Saitoh ,  Takashi Hayano

IPC分类号： G03G9/08 ,  G03G9/10 ,  G03G9/107

CPC分类号： G03G9/10 ,  G03G9/0823 ,  G03G9/107

摘要： An Li--Mn ferrite carrier comprising 2 to 15 mol % of Li.sub.2 O, 5 to 30 mol % of MnO and 60 to 90 mol % of Fe.sub.2 O.sub.3. The carrier may contain at least one sintering aid selected from the group consisting of CaO, Na.sub.2 O, SiO.sub.2, V.sub.2 O.sub.5, Al.sub.2 O.sub.3, As.sub.2 O.sub.3, Bi.sub.2 O.sub.3, Sb.sub.2 O.sub.3 and B.sub.2 O.sub.3 to improve the surface properties thereof. The carrier may be made sensitive to the intensity of electric field by regulating the specific volume resistivities at 200 V/cm and 10 kV/cm within the specific ranges. This carrier is particularly suitable in the reversal developing method, and in the developing method where an A.C. bias voltage is superimposed to a D.C. bias voltage.

摘要翻译： 包含2至15mol％的Li 2 O，5至30mol％的MnO和60至90mol％的Fe 2 O 3的Li-Mn铁氧体载体。 载体可以含有至少一种选自CaO，Na 2 O，SiO 2，V 2 O 5，Al 2 O 3，As 2 O 3，Bi 2 O 3，Sb 2 O 3和B 2 O 3的烧结助剂以改善其表面性质。 可以通过在特定范围内通过调节200V / cm和10kV / cm的比体积电阻率来使载体对电场强度敏感。 该载体特别适用于反转显影方法，并且在将直流偏置电压叠加到直流偏置电压的显影方法中。

公开(公告)号：US5669051A

公开(公告)日：1997-09-16

申请号：US627182

申请日：1996-04-03

申请人： Masahisa Ochiai ,  Tsutomu Saitoh ,  Masumi Asanae

发明人： Masahisa Ochiai ,  Tsutomu Saitoh ,  Masumi Asanae

IPC分类号： G03G9/10 ,  G03G13/09 ,  G03G15/08 ,  G03G15/09

CPC分类号： G03G9/10 ,  G03G13/09

摘要： A method in which a photoconductive surface is charged to a uniform potential by a charging brush and a two-component magnetic developer is directly attracted on the surfaced of a sleeve-less developing roll formed from a permanent magnet member and transported by the rotation of the permanent magnet member. An electrostatic latent image is developed with the transported magnetic developer in a developing zone to form a visual toner image on the photoconductive drum. The toner image is transferred to a recording sheet by a transfer roll and permanently fixed thereon by a suitable fixing means. The specific volume resistance of the magnetic carrier is restricted to a particular range to prevent the magnetic carrier from adhering to the photoconductive surface.

摘要翻译： 通过充电刷和双组分磁性显影剂将光电导表面充电至均匀电位的方法直接吸引在由永磁体构件形成的无套筒显影辊的表面上，并通过旋转 永磁体。 在显影区域中用传送的磁性显影剂显影静电潜像，以在感光鼓上形成视觉调色剂图像。 调色剂图像通过转印辊转印到记录纸上，并通过合适的固定装置永久地固定在记录纸上。 磁性载体的比体积电阻被限制在特定的范围，以防止磁性载体粘附到光电导表面上。

公开(公告)号：US5483329A

公开(公告)日：1996-01-09

申请号：US292957

申请日：1994-08-22

申请人： Masumi Asanae ,  Tsutomu Saitoh

发明人： Masumi Asanae ,  Tsutomu Saitoh

IPC分类号： G03G9/107 ,  G03G9/113 ,  G03G21/00 ,  G03G21/06 ,  G03G15/06 ,  G03G15/24

CPC分类号： G03G9/1133 ,  G03G21/0064 ,  G03G9/1075 ,  G03G9/1135 ,  G03G2221/0005

摘要： There is provided an improved carrier for a developer for use in an electrophotographic recording apparatus, which is composed of iron particles having non-spherical shapes and an average size of 10-50 .mu.m, and resin layers formed on surfaces of the iron particles. There is also provided a method of producing a visual toner image, in which a developer containing the above carrier is employed and a magnetic brush of the developer functions to develop an electrostatic latent image and clean a residual toner simultaneously. The toner image obtained exhibits a high toner density and a high image quality.

摘要翻译： 提供了一种用于电子照相记录装置的显影剂的改进的载体，其由具有非球形的铁颗粒和10-50μm的平均尺寸构成，并且在铁颗粒的表面上形成树脂层。 还提供了一种生产视觉调色剂图像的方法，其中使用含有上述载体的显影剂，并且显影剂的磁刷用于显影静电潜像并同时清洁残留的调色剂。 获得的调色剂图像具有高的调色剂密度和高的图像质量。

公开(公告)号：US6134413A

公开(公告)日：2000-10-17

申请号：US962265

申请日：1997-10-31

申请人： Masumi Asanae ,  Tsutomu Saitoh ,  Takashi Hayano

发明人： Masumi Asanae ,  Tsutomu Saitoh ,  Takashi Hayano

IPC分类号： G03G9/113 ,  G03G15/08 ,  G03G15/34 ,  G03G15/09

CPC分类号： G03G9/113 ,  G03G15/344 ,  G03G9/1136 ,  G03G9/1139 ,  G03G2217/0091

摘要： 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.

摘要翻译： 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。

公开(公告)号：US5496673A

公开(公告)日：1996-03-05

申请号：US467515

申请日：1995-06-07

申请人： Tsutomu Saitoh ,  Masumi Asanae

发明人： Tsutomu Saitoh ,  Masumi Asanae

IPC分类号： G03G9/107 ,  G03G9/113

CPC分类号： G03G9/1075 ,  G03G9/107 ,  G03G9/1132 ,  G03G9/1139

摘要： A carrier for the developer of electrostatic latent images which is designed to reduce the fouling of the photosensitive member in the developer unit and to lower the volume resistivity of the carrier. This object is achieved by covering the resin-coated carrier with carbon black having a pH value lower than 7 and an average particle diameter smaller than 16 nm. The object is also achieved by covering the resin-bonded carrier with carbon black having a pH value higher than 7.5, if the carrier is to be mixed with a negatively charged toner, or having a pH value lower than 7, if the carrier is to be mixed with a positively charged toner, such that the carrier has a volume resistivity in the range of 10.sup.1 to 10.sup.4 .OMEGA.-cm.

摘要翻译： 用于静电潜像显影剂的载体，其设计用于减少显影单元中感光构件的结垢并降低载体的体积电阻率。 该目的通过用pH值低于7且平均粒径小于16nm的炭黑覆盖树脂涂覆的载体来实现。 如果载体与带负电荷的调色剂混合，或者pH值低于7，则通过用pH值高于7.5的炭黑覆盖树脂粘合的载体来实现该目的，如果载体为 与带正电的调色剂混合，使得载体的体积电阻率在101至104欧姆 - 厘米的范围内。

公开(公告)号：US5789129A

公开(公告)日：1998-08-04

申请号：US769432

申请日：1996-12-19

申请人： Masahisa Ochiai ,  Tsutomu Saitoh

发明人： Masahisa Ochiai ,  Tsutomu Saitoh

IPC分类号： G03G9/107

CPC分类号： G03G9/107

摘要： 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.

摘要翻译： 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。