公开(公告)号：US5549955A

公开(公告)日：1996-08-27

申请号：US419757

申请日：1995-04-10

申请人： Toshio Kawamata ,  Satoru Hayakawa ,  Yasushi Endo

发明人： Toshio Kawamata ,  Satoru Hayakawa ,  Yasushi Endo

IPC分类号： G11B5/70 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/06 ,  G11B5/68 ,  G11B5/738 ,  G11B5/84 ,  G11B5/66

CPC分类号： G11B5/68 ,  G11B5/738 ,  G11B5/84 ,  Y10S428/90 ,  Y10T428/265

摘要： A magnetic recording disk having a good overwriting characteristic and an excellent electromagnetic characteristic, as well as superior running durability. The magnetic recording disk comprises a non-magnetic support having coated thereon, in the order, a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin and a magnetic layer comprising mainly a ferromagnetic powder and a binder resin, wherein the magnetic layer is formed by applying a magnetic layer coating solution onto the coated non-magnetic layer while the non-magnetic layer remains in a wet condition, the average thickness of the magnetic layer is 0.5 .mu.m or less, and the maximum thickness and the minimum thickness thereof fall within the range of .+-.15% of the average thickness of the magnetic layer.

摘要翻译： 具有良好的重写特性和优异的电磁特性的磁记录盘，以及优异的运行耐久性。 磁记录盘包括其上涂覆有非磁性层的非磁性载体，主要包括非磁性粉末和粘合剂树脂，以及主要包含铁磁性粉末和粘合剂树脂的磁性层，其中， 通过在非磁性层保持湿润状态下将磁性层涂布液施加到涂布的非磁性层上而形成磁性层，磁性层的平均厚度为0.5μm以下，最大厚度为 其最小厚度落在磁性层的平均厚度的+/- 15％的范围内。

公开(公告)号：US5024885A

公开(公告)日：1991-06-18

申请号：US252076

申请日：1988-09-30

申请人： Yasushi Endo ,  Mikihiko Kato ,  Toshio Kawamata ,  Kouichi Masaki

发明人： Yasushi Endo ,  Mikihiko Kato ,  Toshio Kawamata ,  Kouichi Masaki

IPC分类号： G11B5/708 ,  C09D5/23 ,  G11B5/702 ,  G11B5/706 ,  G11B5/714

CPC分类号： G11B5/70678 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/31569

摘要： A magnetic recording medium is described, comprising a nonmagnetic support having thereon a magnetic layer containing ferromagnetic particles which are a hexagonal system tabular particle, and which have an axis of easy magnetization in a direction of perpendicular to the major axis of the plate and are dispersed in a binder, wherein said ferromagnetic particles have a saturation magnetization of 60 emu/g or higher, a specific surface area (BET method) of from 25 to 70 m.sup.2 /g, an average particle diameter of from 0.01 to 0.2 .mu.m, and a coercive force of from 400 to 2000 oersteds, and said biner contains a resin having at least one kind of polar group in an amount of 1.times.10.sup.-5 eq/g or more of the polar group.

摘要翻译： 描述了一种磁记录介质，其包括非磁性载体，其上具有包含六方晶系平板状颗粒的铁磁颗粒的磁性层，并且在垂直于该板的长轴的方向上具有容易磁化的轴并且分散 在粘合剂中，其中所述铁磁性颗粒的饱和磁化强度为60emu / g以上，比表面积（BET法）为25〜70m 2 / g，平均粒径为0.01〜0.2μm， 矫顽力为400〜2000奥斯特，所述膳食酒含有极性基团为1×10 -5 eq / g以上的至少1种极性基团的树脂。

公开(公告)号：US5085911A

公开(公告)日：1992-02-04

申请号：US536859

申请日：1990-06-12

申请人： Mikihiko Kato ,  Yasushi Endo ,  Toshio Kawamata

发明人： Mikihiko Kato ,  Yasushi Endo ,  Toshio Kawamata

IPC分类号： G11B5/72

CPC分类号： G11B5/72 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/31786

摘要： A novel flexible magnetic disc is provided comprising a protective layer on the periphery of a central hole, wherein the protective layer comprises of two layers, the lower one of the two layers being a composition mainly composed of a printing ink and the upper one being a composition mainly composed of a resin obtained by irradiating a radiation-polymerizable compound with radiation so that it cures.

摘要翻译： 提供了一种新颖的柔性磁盘，其包括在中心孔的周边上的保护层，其中保护层由两层组成，两层中的较低的一层为主要由印刷油墨组成的组合物，上层为 组合物主要由通过用辐射照射辐射聚合性化合物而获得的树脂组成，使得其固化。

公开(公告)号：US5508117A

公开(公告)日：1996-04-16

申请号：US150267

申请日：1993-11-10

申请人： Toshio Kawamata ,  Yasushi Endo

发明人： Toshio Kawamata ,  Yasushi Endo

IPC分类号： G11B5/702 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/06 ,  G11B5/706 ,  G11B5/708 ,  G11B5/716 ,  G11B5/842 ,  B22D25/00 ,  B32B5/16 ,  G11B5/66

CPC分类号： G11B5/7022 ,  G11B5/7085 ,  G11B5/716 ,  Y10S428/90 ,  Y10T428/12458 ,  Y10T428/24942 ,  Y10T428/2495 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257

摘要： Disclosed is a magnetic recording medium comprising a nonmagnetic support having thereon a magnetic layer comprising a ferromagnetic powder and a binder resin as the main components together with abrasive particles. The ferromagnetic powder is a hexagonal ferrite fine powder having particle sizes of from 0.01 to 0.2 .mu.m and a coercive force of from 600 to 2,000 Oe. The binder resin is composed of a polyurethane resin and/or a vinyl chloride resin each having at least one kind of a polar group, the abrasive particles are composed of a fine particle abrasive having a mean particle size of from 0.1 to 0.39 .mu.m and a coarse particle abrasive having a mean particle size of from 0.4 to 1.0 .mu.m, and the density of the coarse particle abrasive distributed in the vicinity of the surface of the magnetic layer is higher than that of the coarse particle abrasive distributed in the other region of the magnetic layer.

摘要翻译： 公开了一种包括非磁性载体的磁记录介质，其上具有包含铁磁粉末和粘合剂树脂作为主要组分的磁性层以及磨料颗粒。 铁磁性粉末是粒径为0.01〜0.2μm，矫顽力为600〜2000Oe的六方铁氧体细粉末。 粘合剂树脂由具有至少一种极性基团的聚氨酯树脂和/或氯乙烯树脂构成，磨粒由平均粒径为0.1〜0.39μm的细颗粒磨料和 平均粒径为0.4〜1.0μm的粗粒磨料，分布在磁性层表面附近的粗粒磨料的密度高于分布在其他区域的粗粒磨料的密度 的磁性层。

公开(公告)号：US5389418A

公开(公告)日：1995-02-14

申请号：US108455

申请日：1993-08-19

申请人： Masataka Ota ,  Yasushi Endo ,  Satoru Hayakawa ,  Toshio Kawamata

发明人： Masataka Ota ,  Yasushi Endo ,  Satoru Hayakawa ,  Toshio Kawamata

IPC分类号： G11B5/708 ,  C09D5/23 ,  G11B5/70 ,  G11B5/73 ,  G11B5/738 ,  G11B5/82 ,  G11B5/842 ,  G11B5/00

CPC分类号： G11B5/738 ,  G11B5/70 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/2495 ,  Y10T428/25 ,  Y10T428/265

摘要： There is disclosed a flexible magnetic recording disk which is suitable as a high capacity magnetic disk for data recording and has an excellent durability. The flexible magnetic recording disk comprises a non-magnetic support having thereon a non-magnetic layer comprising a non-magnetic powder and a binder resin, and a magnetic layer comprising a ferromagnetic powder and a binder resin, in this order, wherein the magnetic layer has a thickness of 1 .mu.m or less, which is 1/2 or less of the thickness of the non-magnetic layer; and the magnetic layer further contains the abrasive particles which comprise a first abrasive particles having a Mohs' hardness of 6 or more and an average particle size of 0.8 to 1.4 times as large as the average particle size of the magnetic powder and a second abrasive particles having a Mohs' hardness of 6 or more and an average particle size of 2 to 4 times as large as the average particle size of the ferromagnetic powder.

摘要翻译： 公开了一种适合作为用于数据记录的高容量磁盘的柔性磁记录盘，并且具有优异的耐久性。 柔性磁记录盘包括非磁性载体，其上具有包含非磁性粉末和粘结剂树脂的非磁性层，以及包含铁磁性粉末和粘合剂树脂的磁性层，其中磁性层 的厚度为1μm以下，为非磁性层的厚度的1/2以下。 并且所述磁性层还包含所述磨料颗粒，所述磨料颗粒包含莫氏硬度为6或更高的第一磨料颗粒和平均粒径为磁粉的平均粒度的0.8至1.4倍的第二磨料颗粒 莫氏硬度为6以上，平均粒径为铁磁性粉末的平均粒径的2〜4倍。

公开(公告)号：US5178925A

公开(公告)日：1993-01-12

申请号：US609844

申请日：1990-11-07

申请人： Yasushi Endo ,  Mikihiko Kato ,  Yasuo Nagashima ,  Toshio Kawamata

发明人： Yasushi Endo ,  Mikihiko Kato ,  Yasuo Nagashima ,  Toshio Kawamata

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/702 ,  G11B5/706 ,  G11B5/712 ,  G11B5/714

CPC分类号： G11B5/706 ,  G11B5/7022 ,  G11B5/712 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/2991 ,  Y10T428/3158 ,  Y10T428/31591 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic disc having excellent running durability is disclosed, which comprises a non-magnetic support and a magnetic layer on the non-magnetic support, the layer being composed mainly of a ferromagnetic metal powder and a binder resin, wherein the ferromagnetic metal powder has a pH value of less than 7.0 and a specific surface area as determined by the BET method of at least 40 m.sup.2 /g, and the glass transition temperature of the magnetic layer is at least 75.degree. C.

摘要翻译： 公开了一种具有优异的运行耐久性的磁盘，其包括非磁性支撑件和非磁性支撑件上的磁性层，该层主要由铁磁金属粉末和粘合剂树脂组成，其中铁磁性金属粉末具有 pH值小于7.0，BET法测定的比表面积为40m 2 / g以上，磁性层的玻璃化转变温度为75℃以上。

公开(公告)号：US5145738A

公开(公告)日：1992-09-08

申请号：US331205

申请日：1989-03-31

申请人： Mikihiko Kato ,  Yasushi Endo ,  Toshio Kawamata ,  Yasuo Nishikawa

发明人： Mikihiko Kato ,  Yasushi Endo ,  Toshio Kawamata ,  Yasuo Nishikawa

IPC分类号： C09D5/23 ,  C10M103/02 ,  C10M105/34 ,  C10N40/18 ,  G11B5/706 ,  G11B5/708 ,  G11B5/71

CPC分类号： G11B5/71 ,  G11B5/70605 ,  G11B5/708 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/30

摘要： A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer comprising ferromagnetic metal powder and a binder, the magnetic layer further comprising carbon black having an average particle diameter of 250 m.mu. or more in an amount of from 1 to 10 parts by weight per 100 parts by weight of the ferromagnetic metal powder, and an ester of tridecyl alcohol with stearic acid and/or an ester of tridecyl alcohol with palmitic acid in an amount of from 5 to 20 parts by weight per 100 parts by weight of the ferromagnetic metal powder.

摘要翻译： 一种磁记录介质，其特征在于，具有非磁性载体，其上具有含有铁磁性金属粉末和粘合剂的磁性层，所述磁性层还含有平均粒径为250μm以上的碳黑，其量为1〜10份 的铁硬质金属粉末100重量份，十三烷醇与硬脂酸的酯和/或十三烷醇与棕榈酸的酯的量为每100重量份的5-20重量份 铁磁金属粉末。

公开(公告)号：US4992328A

公开(公告)日：1991-02-12

申请号：US253636

申请日：1988-10-06

申请人： Mikihiko Kato ,  Yasushi Endo ,  Toshio Kawamata

发明人： Mikihiko Kato ,  Yasushi Endo ,  Toshio Kawamata

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

CPC分类号： G11B5/7085 ,  G11B5/70678 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/257

摘要： A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer containing ferromagnetic particles which are dispersed in a binder and have a tabular hexagonal crystal shape with an axis of easy magnetization perpendicular to the plate, wherein said ferromagnetic particles have a specific surface area of from 50 to less than 70 m.sup.2 /g, and further said magnetic layer contains abrasive agents having a Mohs' hardness of 6 or more and having an average particle diameter of from 0.3 to 1.0 .mu.m in an amount of from 7 to 15 parts by weight per 100 parts by weight of the ferromagnetic particles.

摘要翻译： 公开了一种磁记录介质，其包括非磁性载体，其上具有包含铁磁颗粒的磁性层，所述磁性层分散在粘合剂中并且具有平板状六边形晶体形状，其具有垂直于板的易磁化轴，其中所述铁磁颗粒具有特定的 表面积为50〜70m 2 / g以下，进一步，所述磁性层含有莫氏硬度为6以上，平均粒径为0.3〜1.0μm的研磨剂，其用量为7〜 每100重量份铁磁颗粒为15重量份。

公开(公告)号：US5384175A

公开(公告)日：1995-01-24

申请号：US959795

申请日：1992-10-13

申请人： Masaya Kojima ,  Kazuhiro Niitsuma ,  Satoru Hayakawa ,  Toshio Kawamata ,  Yasushi Endo

发明人： Masaya Kojima ,  Kazuhiro Niitsuma ,  Satoru Hayakawa ,  Toshio Kawamata ,  Yasushi Endo

IPC分类号： G11B5/706 ,  G11B5/738 ,  G11B23/00

CPC分类号： G11B5/70605 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/30

摘要： A novel magnetic recording disc is provided comprising, a nonmagnetic support having thereon a nonmagnetic layer comprising nonmagnetic particles and a binder resin, and a magnetic layer comprising ferromagnetic particles and a binder resin, in this order. The nonmagnetic particles in the nonmagnetic layer are partially or entirely electrically conductive particles, the thickness of the magnetic layer is in the range of 0.5 .mu.m or less, and the orientation ratio of the ferromagnetic particles in the magnetic layer is 0.85 or more.A novel process for preparing the magnetic recording disc is provided. Further, a novel process for recording and reproduction of a signal having a shortest recordable wavelength of 1.5 .mu.m or less is provided, which utilizes the magnetic recording disc in conjunction with a magnetic head having a gap length (.delta.) of 0.50 .mu.m or less.

摘要翻译： 提供了一种新颖的磁记录盘，其包括：非磁性载体，其上具有包含非磁性颗粒和粘合剂树脂的非磁性层，以及包含铁磁颗粒和粘合剂树脂的磁性层。 非磁性层中的非磁性颗粒是部分或全部是导电颗粒，磁性层的厚度在0.5μm或更小的范围内，并且磁性层中铁磁性颗粒的取向比为0.85以上。 提供了一种制备磁记录盘的新颖方法。 另外，提供了一种用于记录和再现具有最小可记录波长为1.5μm或更小的信号的新颖方法，其利用磁记录盘与间隙长度（delta）为0.50μm的磁头或 减。

公开(公告)号：US08279554B2

公开(公告)日：2012-10-02

申请号：US13364610

申请日：2012-02-02

申请人： Hitoshi Noguchi ,  Osamu Shimizu ,  Yasushi Endo

发明人： Hitoshi Noguchi ,  Osamu Shimizu ,  Yasushi Endo

IPC分类号： G11B5/78

CPC分类号： G11B5/70 ,  G11B5/00821 ,  G11B5/70678 ,  G11B5/71 ,  G11B5/714

摘要： The magnetic signal reproduction system comprises a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support; and a reproduction head, wherein a number of protrusions equal to or greater than 10 nm in height on the magnetic layer surface, as measured by an atomic force microscope, ranges from 50 to 2500/10,000 μm2, a quantity of lubricant on the magnetic layer surface, denoted as a surface lubricant index, ranges from 0.5 to 5.0, a surface abrasive occupancy of the magnetic layer ranges from 2 to 20 percent, and the reproduction head is a magnetoresistive magnetic head comprising a spin-valve layer.

摘要翻译： 磁信号再现系统包括磁记录介质，其包括在非磁性载体上包含铁磁粉末和粘合剂的磁性层; 以及再现头，其中通过原子力显微镜测量的磁性层表面上的高度等于或大于10nm的突起的数量范围为50至2500 /10,000μm2，磁性层上的润滑剂量 以表面润滑剂指数表示的表面的范围为0.5至5.0，磁性层的表面磨料占有率为2至20％，再现头为包括自旋阀层的磁阻磁头。