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：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：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：US5731121A

公开(公告)日：1998-03-24

申请号：US711743

申请日：1996-09-10

申请人： Masumi Asanae ,  Akihiko Funakawa ,  Masahisa Ochiai

发明人： Masumi Asanae ,  Akihiko Funakawa ,  Masahisa Ochiai

IPC分类号： G03G9/08 ,  G03G9/083 ,  G03G9/087 ,  G03G9/097 ,  G03G9/10

CPC分类号： G03G9/08797 ,  G03G9/083 ,  G03G9/0833 ,  G03G9/09708 ,  G03G9/09725 ,  G03G9/09791

摘要： A developer for developing an electrostatic latent image by a developing method of a type in which residual toner particles on an image-bearing member are recovered therefrom and reused for developing the electrostatic latent image, which comprises a magnetic toner and a magnetic carrier. The magnetic toner comprises a binder resin having a number average molecular weight of 2,000-100,000, a weight average molecular weight of 5,000-500,000, and a melt viscosity of 10.sup.5 P or less at 120.degree. C., a release agent having a softening point of 160.degree. C. or lower; and a magnetic powder. The magnetic toner particle is externally added on a surface thereof or internally added thereto with a surface treating agent comprising a fine powder of at least one metal salt of stearic acid, a fine powder of at least one inorganic oxide and an optional resin powder.

摘要翻译： 用于通过显影方法显影静电潜像的显影剂，其中图像承载部件上的残留调色剂颗粒从其中回收并重新用于显影静电潜像，其包括磁性调色剂和磁性载体。 磁性调色剂包括数均分子量为2,000-100,000，重均分子量为5,000-500,000，熔点粘度在120℃时为105P或更低的粘合剂树脂，具有软化点的脱模剂 160℃以下; 和磁粉。 磁性调色剂颗粒在其表面外部加入或内部添加有表面处理剂，其包含至少一种硬脂酸金属盐，至少一种无机氧化物的细粉末和任选的树脂粉末的细粉末。

公开(公告)号：US5532095A

公开(公告)日：1996-07-02

申请号：US294968

申请日：1994-08-24

申请人： Masumi Asanae ,  Masahisa Ochiai ,  Fumio Kimura ,  Akihiko Funakawa ,  Toshihiko Noshiro

发明人： Masumi Asanae ,  Masahisa Ochiai ,  Fumio Kimura ,  Akihiko Funakawa ,  Toshihiko Noshiro

IPC分类号： G03G9/08 ,  G03G9/083

CPC分类号： G03G9/0823 ,  G03G9/0833 ,  G03G9/0835 ,  G03G9/0819 ,  Y10S430/104

摘要： A magnetic toner includes at least binding resin (for instance, a styrene-acryl resin) and magnetic powder (for instance, Mn--Zn ferrite or Ni--Zn ferrite) having a saturation magnetization of at least 50 emu/g and a coercive force as measured under the magnetic field of 10 kOe not exceeding 50 Oe. An image formed by using this magnetic toner has high quality and is free of tailing.

摘要翻译： 磁性调色剂至少包含粘结树脂（例如苯乙烯 - 丙烯酸树脂）和饱和磁化强度至少为50emu / g的磁性粉末（例如Mn-Zn铁氧体或Ni-Zn铁氧体）和矫顽力 在10kOe的磁场下测量不超过50Oe。 通过使用该磁性调色剂形成的图像具有高品质并且没有拖尾。

公开(公告)号：US5659861A

公开(公告)日：1997-08-19

申请号：US623298

申请日：1996-03-28

申请人： Keitaro Yamashita ,  Masumi Asanae ,  Masahisa Ochiai ,  Toshihiro Noshiro

发明人： Keitaro Yamashita ,  Masumi Asanae ,  Masahisa Ochiai ,  Toshihiro Noshiro

IPC分类号： G03G13/09 ,  G03G15/09

CPC分类号： G03G15/0921 ,  G03G13/09

摘要： A method for developing electrostatic latent image on a rotating photoconductive drum by a magnetic developer transported by a rotating developing roll disposed opposite to the photoconductive drum, the developing roll being made of a cylindrical permanent magnet having on circumferential surface thereof equispaced magnetic poles extending along the axial direction. In the method the magnetic poles are equispaced by an inter-pole pitch of 0.5-10 mm, the photoconductive drum and the developing roll are rotated so as to move in opposite directions in an developing zone, and the ratio of peripheral speeds of the developing roll and photoconductive drum are regulated within 1 to 5. By the above method, an electrophotographic imaging apparatus can be reduced in the size thereof while reproducing high-quality images.

摘要翻译： 一种通过由与感光鼓相对设置的旋转显影辊输送的磁性显影剂在旋转感光鼓上显影静电潜像的方法，显影辊由圆柱形永久磁铁制成，其圆周表面具有沿着 轴向。 在该方法中，磁极间距为0.5-10mm的间极间距，使感光鼓和显影辊旋转以便在显影区域中沿相反方向移动，并且显影区域的圆周速度比 辊和感光鼓在1至5之间调节。通过上述方法，可以在再现高质量图像的同时减小电子照相成像装置的尺寸。

公开(公告)号：US5554479A

公开(公告)日：1996-09-10

申请号：US356064

申请日：1994-12-14

申请人： Masahisa Ochiai ,  Masumi Asanae

发明人： Masahisa Ochiai ,  Masumi Asanae

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

CPC分类号： G03G9/08 ,  G03G15/0921 ,  G03G9/10

摘要： An image forming method for conveying a magnetic developer 70 held on the surface of a developer conveying member 40 opposed to a image-bearing member 30 to a developing region to develops electrostatic latent images, comprises implementing as the developer conveying member 40 a semiconductive or an insulating cylindrical magnet with a plurality of heteropolar magnet poles arranged alternatively on its surface, the overall magnet being integrally formed, rotating the developer conveying member 40 to convey the magnetic developer 70 to the developing region, and using the magnetic developer 70 conveyed to the developing region to develop electrostatic bearing member latent images formed on the image-bearing member 30.This constitution allows an inexpensive sleeveless roll magnet to be used to obtain high-quality images.

摘要翻译： 用于将保持在与图像承载部件30相对的显影剂传送部件40的表面上的磁性显影剂70传送到显影区域以形成静电潜像的图像形成方法包括将显影剂传送部件40实施为半导体或 具有多个在其表面上交替布置的多极磁极的绝缘圆柱形磁体，整体磁体一体形成，使显影剂传送构件40旋转以将磁性显影剂70输送到显影区域，并使用传送到显影区域的磁性显影剂70 以形成形成在图像承载部件30上的静电承载部件潜像。这种结构允许使用便宜的无袖卷轴磁体来获得高质量的图像。