公开(公告)号：US06479131B1

公开(公告)日：2002-11-12

申请号：US09596345

申请日：2000-06-19

申请人： Kiyomi Ejiri ,  Koji Naoe ,  Masahiko Mori

发明人： Kiyomi Ejiri ,  Koji Naoe ,  Masahiko Mori

IPC分类号： G11B5733

CPC分类号： G11B5/738 ,  Y10T428/24355 ,  Y10T428/2495 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/2982

摘要： Disclosed is a magnetic recording medium exhibiting a high C/N ratio in high-density magnetic recording. The magnetic recording medium has, on a flexible nonmagnetic support, at least a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder on the nonmagnetic layer, where the magnetic layer has an average thickness d in the range of from 0.01 to 0.3 &mgr;m, said nonmagnetic powder has an acicular shape, and the ratio of a mean length L of the major axis of the nonmagnetic powder to an average thickness D of said nonmagnetic layer satisfies the relationship of 1/10≦L/D≦2.

摘要翻译： 公开了在高密度磁记录中表现出高C / N比的磁记录介质。 磁性记录介质在柔性非磁性载体上至少包含非磁性粉末和粘合剂的非磁性层和在非磁性层上含有铁磁粉末和粘合剂的磁性层，其中磁性层的平均厚度d在 0.01〜0.3μm的范围，所述非磁性粉末具有针状，非磁性粉末的长轴的平均长度L与所述非磁性层的平均厚度D的比例满足1/10 < = L / D <= 2。

公开(公告)号：US06475598B1

公开(公告)日：2002-11-05

申请号：US09602225

申请日：2000-06-23

申请人： Koji Naoe ,  Kiyomi Ejiri ,  Masahiko Mori

发明人： Koji Naoe ,  Kiyomi Ejiri ,  Masahiko Mori

IPC分类号： G11B568

CPC分类号： B82Y15/00 ,  G11B5/7085 ,  G11B5/7305 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24975 ,  Y10T428/25 ,  Y10T428/265

摘要： The present invention provides a magnetic recording medium exhibiting a high C/N ratio as well as having excellent running durability even under high-density magnetic recording. Disclosed is a magnetic recording medium comprising, on either side of a flexible nonmagnetic support, a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order, having an average thickness of said magnetic layer of from 0.01 to 0.3 &mgr;m and a total average thickness of said magnetic layer and said nonmagnetic layer of from 0.1 to 1.0 &mgr;m, characterized in that the number of projections having a height equal to or higher than 20 nm on the magnetic layer surface measured with AFM (Atomic Force Microscope) is equal to or less than 100 pieces per 30 &mgr;m×30 &mgr;m square as well as the PSD (Power Spectrum Density) of the magnetic layer surface measured with the AFM is equal to or less than 0.2 nm2 in the wavelength of from of 1 to 5 &mgr;m.

摘要翻译： 本发明提供了一种表现出高C / N比的磁记录介质，并且即使在高密度磁记录下也具有优异的运行耐久性。公开了一种磁记录介质，其在柔性非磁性载体的任一侧上包含非磁性层 含有非磁性粉末和粘合剂以及含有铁磁性粉末和粘合剂的磁性层，所述磁性层的平均厚度为0.01〜0.3μm，所述磁性层和所述非磁性层的总平均厚度为 0.1〜1.0μm，其特征在于，使用AFM（原子力显微镜）测定的磁性层表面上的高度等于或大于20nm的突起的数量等于或小于每30mum×30μm的正方形100个 以及用AFM测量的磁性层表面的PSD（功率谱密度）在1至5的波长中等于或小于0.2nm 2 妈妈

公开(公告)号：US6074724A

公开(公告)日：2000-06-13

申请号：US918864

申请日：1997-08-26

申请人： Hiroo Inaba ,  Kiyomi Ejiri ,  Masaki Suzuki ,  Koji Naoe ,  Yuichiro Murayama ,  Hiroaki Takano

发明人： Hiroo Inaba ,  Kiyomi Ejiri ,  Masaki Suzuki ,  Koji Naoe ,  Yuichiro Murayama ,  Hiroaki Takano

IPC分类号： G11B5/702 ,  G11B5/706

CPC分类号： B82Y15/00 ,  G11B5/7021 ,  G11B5/7022 ,  G11B5/70621 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/265

摘要： A magnetic recording medium is disclosed, which comprises a support having thereon a magnetic layer comprising a binder and a ferromagnetic powder dispersed therein, wherein said binder comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage, and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG.; and further a magnetic recording medium is disclosed, comprising a support having thereon in succession an undercoat layer comprising a binder U and an inorganic powder dispersed therein and a magnetic layer comprising a binder M and a ferromagnetic powder dispersed therein, wherein at least either of the binder U or M comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG..

摘要翻译： 公开了一种磁记录介质，其包括其上具有包含粘合剂和分散在其中的铁磁粉末的磁性层的载体，其中所述粘合剂包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性 粉末是含铁的铁磁性金属粉末，其平均长轴长度为0.05至0.19μm，微晶尺寸为100至230安培; 并且还公开了一种磁记录介质，包括其上连续地具有包含粘合剂U和分散在其中的无机粉末的底涂层的支撑体和包含粘合剂M和分散在其中的铁磁性粉末的磁性层，其中， 粘合剂U或M包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性粉末是包含Fe并且具有0.05至0.19μm的平均长轴长度的铁磁性金属粉末，以及 微晶尺寸为100至230安培。

公开(公告)号：US5955189A

公开(公告)日：1999-09-21

申请号：US773512

申请日：1996-12-23

申请人： Kiyomi Ejiri ,  Koji Naoe

发明人： Kiyomi Ejiri ,  Koji Naoe

IPC分类号： G11B5/706 ,  G11B5/708 ,  G11B5/714

CPC分类号： G11B5/7085 ,  G11B5/70621 ,  G11B5/708 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/258 ,  Y10T428/259 ,  Y10T428/265

摘要： A magnetic recording medium includes at least one magnetic layer formed by dispersing a ferromagnetic powder in a binder, the ferromagnetic powder including at least one kind of rare earth metal element selected from Y or metal elements of lanthanide series and being constituted of acicular ferromagnetic alloy powder particles whose .sigma. s is in the range of 120 to 160 emu/g, whose average longitudinal axis length is in the range of 0.04 to 0.2 .mu.m and whose crystallite size is in the range of 100 to 300 angstroms, the magnetic layer including an abrasive agent whose average particle diameter is in the range of 0.03 to 0.3 .mu.m and containing carbon black having an average particle diameter of 50 to 300 m.mu.. The magnetic recording medium has an excellent electromagnetic conversion characteristics and, particularly, a good preservation capability and can prevent a magnetic head from being abraded.

摘要翻译： 磁记录介质包括通过将铁磁粉末分散在粘合剂中形成的至少一个磁性层，所述铁磁粉末包括选自Y或稀土金属元素中的至少一种稀土金属元素或镧系金属元素，并由针状铁磁合金粉末 其sigma在120〜160emu / g的范围内，其平均纵轴长度在0.04〜0.2μm的范围内，其微晶尺寸在100〜300埃的范围内，所述磁性层包括 研磨剂的平均粒径在0.03〜0.3μm的范围内，并且含有平均粒径为50〜300μm的碳黑。 磁记录介质具有优异的电磁转换特性，特别是具有良好的保存能力并且可以防止磁头被磨损。

公开(公告)号：US06680088B2

公开(公告)日：2004-01-20

申请号：US10151998

申请日：2002-05-22

申请人： Koji Naoe ,  Hiroyuki Kobayashi

发明人： Koji Naoe ,  Hiroyuki Kobayashi

IPC分类号： B05D300

CPC分类号： G11B5/842

摘要： A process for producing a magnetic recording medium is provided in which a magnetic layer including a ferromagnetic powder and a binder is provided on a non-magnetic flexible support. In the process, a magnetic liquid containing mainly a ferromagnetic powder and a binder, and an abrasive liquid paste including an abrasive and a binder are prepared separately, and the abrasive liquid paste is subsequently subjected to an ultrasonic dispersion treatment and then mixed with the magnetic liquid to prepare a magnetic coating solution for the magnetic layer.

摘要翻译： 提供了一种用于制造磁记录介质的方法，其中在非磁性柔性支撑件上设置包括铁磁性粉末和粘合剂的磁性层。 在此过程中，分别制备主要含有铁磁性粉末和粘合剂的磁性液体，以及包含研磨剂和粘合剂的研磨液体糊剂，然后对研磨液糊进行超声波分散处理，然后与磁性混合 液体以制备用于磁性层的磁性涂层溶液。

公开(公告)号：US07901805B2

公开(公告)日：2011-03-08

申请号：US11729842

申请日：2007-03-30

申请人： Koji Naoe

发明人： Koji Naoe

IPC分类号： G11B5/706

CPC分类号： G11B5/70 ,  G11B5/70678 ,  G11B5/7085 ,  G11B5/714 ,  G11B5/842

摘要： A magnetic recording medium, which comprises: a nonmagnetic support; and a magnetic layer comprising a ferromagnetic powder and a binder, wherein an average surface roughness (Ra) at a center of a surface of the magnetic layer measured by using an atomic force microscope (AFM) is 2 nm or less, the maximum height (Rmax) thereof is 50 nm or less, and an arithmetic average of phase difference between a drive signal and a response signal of a probe measured with the atomic force microscope in a tapping mode is from 2 to 20°, and a method of producing the same.

摘要翻译： 一种磁记录介质，包括：非磁性载体; 以及包含铁磁粉末和粘合剂的磁性层，其中通过使用原子力显微镜（AFM）测量的磁性层表面的中心处的平均表面粗糙度（Ra）为2nm以下，最大高度 Rmax）为50nm以下，并且利用原子力显微镜在攻丝模式中测量的探针的驱动信号与响应信号之间的相位差的算术平均值为2〜20°， 相同。

公开(公告)号：US07635499B2

公开(公告)日：2009-12-22

申请号：US11033973

申请日：2005-01-13

申请人： Koji Naoe

发明人： Koji Naoe

IPC分类号： B05D5/00

CPC分类号： G11B5/8412 ,  G11B5/7085 ,  G11B5/842

摘要： The present invention provides a method of manufacturing a magnetic recording medium that is made by applying a magnetic paint containing a ferromagnetic powder and a binder to a nonmagnetic support, wherein the magnetic paint contains a magnetic liquid, which contains the ferromagnetic powder and the binder, and a polishing material liquid, which contains a polishing material and a solvent, and wherein the magnetic liquid and the polishing material liquid are individually subjected to dispersion treatment, the magnetic liquid and the polishing material liquid are then mixed together, and after that, a mixed liquid of the magnetic liquid and the polishing material liquid are subjected to dispersion treatment by application of ultrasonic waves.

摘要翻译： 本发明提供一种制造磁记录介质的方法，该磁记录介质通过将含有铁磁性粉末和粘合剂的磁性涂料涂覆在非磁性载体上而制成，其中磁性涂料含有含有铁磁粉末和粘合剂的磁性液体， 以及包含研磨材料和溶剂的研磨材料液，其中分别对磁性液体和研磨材料液进行分散处理，然后将磁性液体和研磨材料液混合在一起，然后将 通过施加超声波对磁性液体和研磨材料液的混合液进行分散处理。

公开(公告)号：US07172819B2

公开(公告)日：2007-02-06

申请号：US10601631

申请日：2003-06-24

申请人： Koji Naoe

发明人： Koji Naoe

IPC分类号： B05D3/00 ,  B05D5/12

CPC分类号： G11B5/842 ,  Y10T428/12146

摘要： In the method for producing a magnetic recording medium having a nonmagnetic substrate coated with a magnetic coating material containing a ferromagnetic powder and a binder, the magnetic coating material contains a liquid A constituted by the ferromagnetic powder and a solvent, and a solution B of the binder, and the liquid A and the solution B are mixed together by a thin-layer revolving-type fast stirring apparatus, and are thereafter subjected to dispersion processing. Thereby, coagulated particles of the ferromagnetic powder can be dispersed and the coagulation of the ferromagnetic powder can be prevented, thus making it possible to obtain a liquid of ferromagnetic powder with uniform adsorption of the binder. As a result, a magnetic coating material suitable for a low-noise high-density coating-type magnetic recording medium is obtained.

摘要翻译： 在具有涂覆有含铁磁粉末和粘合剂的磁性涂层材料的非磁性基材的磁记录介质的制造方法中，磁性涂层材料含有由铁磁粉末和溶剂构成的液体A， 粘合剂，液体A和溶液B通过薄层旋转式快速搅拌装置混合在一起，然后进行分散处理。 由此，可以分散铁磁性粉末的凝结粒子，能够防止铁磁性粉末的凝结，从而可以获得粘合剂均匀吸附的铁磁性粉末液体。 结果，得到适用于低噪声高密度涂布型磁记录介质的磁性涂料。

公开(公告)号：US20050265120A1

公开(公告)日：2005-12-01

申请号：US11139486

申请日：2005-05-31

申请人： Koji Naoe

发明人： Koji Naoe

IPC分类号： B01F3/12 ,  B01F7/16 ,  B01F7/18 ,  B01F11/02 ,  B01F15/06

CPC分类号： B01F3/1221 ,  B01F3/1242 ,  B01F7/18 ,  B01F11/0225 ,  B01F11/0258 ,  B01F15/065 ,  B01F2215/0431 ,  B01F2215/0454 ,  B01F2215/0481

摘要： An ultrasonic dispersion device of a batch type comprising an ultrasonic oscillator and a liquid vessel, wherein an oscillation frequency of the ultrasonic oscillator is 20 kHz or less, the ultrasonic oscillator is secured to the liquid vessel, and the ultrasonic oscillator is able to come into contact with a treated liquid.

摘要翻译： 一种包括超声波振荡器和液体容器的分批式超声波分散装置，其中超声波振荡器的振荡频率为20kHz以下，超声波振荡器固定在液体容器上，超声波振荡器能够进入 与处理过的液体接触。

公开(公告)号：US20050153062A1

公开(公告)日：2005-07-14

申请号：US11033973

申请日：2005-01-13

申请人： Koji Naoe

发明人： Koji Naoe

IPC分类号： B05D5/12 ,  G11B5/708 ,  G11B5/84 ,  G11B5/842

CPC分类号： G11B5/8412 ,  G11B5/7085 ,  G11B5/842

摘要： The present invention provides a method of manufacturing a magnetic recording medium that is made by applying a magnetic paint containing a ferromagnetic powder and a binder to a nonmagnetic support, wherein the magnetic paint contains a magnetic liquid, which contains the ferromagnetic powder and the binder, and a polishing material liquid, which contains a polishing material and a solvent, and wherein the magnetic liquid and the polishing material liquid are individually subjected to dispersion treatment, the magnetic liquid and the polishing material liquid are then mixed together, and after that, a mixed liquid of the magnetic liquid and the polishing material liquid are subjected to dispersion treatment by application of ultrasonic waves.

摘要翻译： 本发明提供一种制造磁记录介质的方法，该磁记录介质通过将含有铁磁性粉末和粘合剂的磁性涂料涂覆在非磁性载体上而制成，其中磁性涂料含有含有铁磁粉末和粘合剂的磁性液体， 以及包含研磨材料和溶剂的研磨材料液，其中分别对磁性液体和研磨材料液进行分散处理，然后将磁性液体和研磨材料液混合在一起，然后将 通过施加超声波对磁性液体和研磨材料液的混合液进行分散处理。