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公开(公告)号：US07108903B2
公开(公告)日：2006-09-19
申请号：US10704717
申请日：2003-11-12
申请人： Shinji Saito , Hitoshi Noguchi , Hideaki Shiga
发明人： Shinji Saito , Hitoshi Noguchi , Hideaki Shiga
CPC分类号： G11B5/738 , G11B5/70 , G11B5/70678 , G11B5/708 , G11B23/0332
摘要： A magnetic disc medium comprising: a magnetic sheet in the form of a disk; a case encasing the magnetic sheet so as to be capable of rotating; and a nonwoven liner fastened on an inner face of the case so as to face the magnetic sheet, wherein the magnetic sheet comprises a support, a substantially nonmagnetic lower layer, and a magnetic layer containing hexagonal ferrite powder dispersed in a binder and having central plane average surface roughness of from 1 nm to 4 nm, and the liner comprises polyethylene terephthalate in an amount of 20% by weight or more.
摘要翻译： 一种磁盘介质，包括：磁盘形式的磁片; 封装磁性片以能够旋转的壳体; 以及紧固在所述壳体的内表面上以面对所述磁性片材的非织造衬里，其中所述磁性片材包括支撑体，基本上非磁性的下层以及分散在粘合剂中并具有中心平面的含有六边形铁氧体粉末的磁性层 平均表面粗糙度为1nm至4nm，衬垫包含20重量％以上的聚对苯二甲酸乙二醇酯。
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公开(公告)号：US06893701B2
公开(公告)日：2005-05-17
申请号：US10712021
申请日：2003-11-14
申请人： Hitoshi Noguchi , Shinji Saito
发明人： Hitoshi Noguchi , Shinji Saito
CPC分类号： G11B5/82 , G11B5/012 , G11B5/70678 , G11B5/73 , G11B5/738 , G11B11/08 , Y10T428/24975 , Y10T428/265
摘要： A magnetic disk medium having on a support a magnetic layer containing hexagonal ferrite powder dispersed in a binder, with the support having a thickness of 20 μm to 80 μm and the magnetic disk medium having an inside diameter X of 2 mm to 10 mm, an outside diameter Y of 20 mm to 50 mm, an X/Y ratio satisfying the relation 0.05≦X/Y≦0.20 and a curl quantity of 1 mm or below, which is suitable for use in small-diameter portable computer equipment and video recorders, and besides, can attain a recording capacity of at least several hundred megabytes.
摘要翻译： 一种磁盘介质，其在支撑体上具有分散在粘结剂中的含有六角铁氧体粉末的磁性层，其中所述载体的厚度为20μm至80μm，所述磁盘介质的内径X为2mm至10mm， 外径Y为20mm〜50mm，X / Y比满足0.05 <= X / Y <0.20的关系，卷曲量为1mm以下，适用于小型便携式计算机设备， 视频录像机，此外，可以达到至少几百兆的记录容量。
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公开(公告)号：US06797373B2
公开(公告)日：2004-09-28
申请号：US10187829
申请日：2002-07-05
申请人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
发明人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
IPC分类号： G11B568
CPC分类号： G11B5/738 , G11B5/70 , Y10T428/256 , Y10T428/26 , Y10T428/265
摘要： Provided is a magnetic recording medium ensuring an adequate S/N even in high density magnetic recording, and tending not to electrostatically damage MR heads during recording and reproduction employing MR heads. A magnetic recording medium comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic metal powder or a ferromagnetic hexagonal ferrite powder and a binder in this order on at least one side of a nonmagnetic support, wherein said nonmagnetic layer comprises 10 to 50 mass parts of carbon black with a mean particle diameter of 10 to 30 nm per 100 mass parts of said nonmagnetic powder, said magnetic layer has a thickness equal to or less than 0.2 &mgr;m, the standard deviation b of the average intensity a of elements due to said ferromagnetic powder as determined by electron-beam microanalysis is 0.03≦b/a≦0.4, and said magnetic layer has a center surface average roughness Ra equal to or less than 5 nm and a ten-point average roughness Rz equal to or less than 50 nm.
摘要翻译： 提供了即使在高密度磁记录中也能确保足够的S / N的磁记录介质，并且在使用MR磁头的记录和再现期间倾向于不静电损坏MR磁头。 一种包含非磁性粉末和粘合剂的非磁性层的磁记录介质，以及在非磁性载体的至少一侧上依次包含强磁性金属粉末或铁磁六角铁氧体粉末和粘合剂的磁性层，其中所述非磁性层 包含10〜50质量份的碳黑，平均粒径为10〜30nm / 100质量份的所述非磁性粉末，所述磁性层的厚度等于或小于0.2μm，平均强度的标准偏差b 由于通过电子束微量分析测定的所述铁磁性粉末的一个元素是0.03 <= b / a <= 0.4，并且所述磁性层具有等于或小于5nm的中心表面平均粗糙度Ra和10点平均 粗糙度Rz等于或小于50nm。
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公开(公告)号：US06773783B2
公开(公告)日：2004-08-10
申请号：US10384669
申请日：2003-03-11
申请人： Shinji Saito , Hitoshi Noguchi , Nobuo Yamazaki
发明人： Shinji Saito , Hitoshi Noguchi , Nobuo Yamazaki
IPC分类号： G11B582
CPC分类号： G11B5/70 , B32B3/02 , B32B27/36 , Y10T428/24355 , Y10T428/2495 , Y10T428/31786
摘要： A magnetic recording medium in the form of a disc comprising a polyethylene naphthalate support having provided thereon a magnetic layer comprising ferromagnetic metal fine powder or ferromagnetic hexagonal ferrite fine powder dispersed in a binder, wherein the central plane average surface roughness of the magnetic layer of the magnetic recording medium is 5 nm or less, the thickness variation rate of the disc is 3% or less, and the total thickness of the disc X &mgr;m and the outside diameter of the disc Y mm satisfy the relationship of 0.3≦Y/X≦0.8.
摘要翻译： 一种盘形磁记录介质，包括聚萘二甲酸乙二醇酯载体，其上设置有分散在粘合剂中的铁磁性金属细粉末或铁磁性六方铁氧体细粉末的磁性层，其中磁性层的中心平面平均表面粗糙度 磁记录介质为5nm以下，盘的厚度变化率为3％以下，盘X mum的总厚度和盘Ymm的外径满足0.3 <= Y / X＆LE的关系 ; 0.8。
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公开(公告)号：US06541132B2
公开(公告)日：2003-04-01
申请号：US09892858
申请日：2001-06-28
申请人： Hitoshi Noguchi , Shinji Saito , Takeshi Harasawa
发明人： Hitoshi Noguchi , Shinji Saito , Takeshi Harasawa
IPC分类号： G11B5012
CPC分类号： G11B5/70678 , G11B5/70 , G11B5/70621
摘要： A high-capacity magnetic disk comprises a support, a non-magnetic layer and a magnetic layer having a thickness less than 0.15 &mgr;m and containing ferromagnetic powder selected from fine particles of ferromagnetic metal or fine particles of ferromagnetic hexagonal ferrite dispersed in a binder, and the magnetic disk has a track width less than 5 &mgr;m and can record signals having a bit length less than 0.5 &mgr;m, wherein the ratio of the track width to the average major axis length or tabular diameter of ferromagnetic particles is from 50 to 100, the ratio of the shortest bit length to the average major axis length or tabular diameter of ferromagnetic particles is from 3 to 20, and the thickness of magnetic layer has a variation coefficient of 0.5 or below, expressed in terms of a ratio of the standard deviation to the average thickness of the magnetic layer.
摘要翻译： 高容量磁盘包括支撑体，非磁性层和厚度小于0.15μm的磁性层，并且含有选自铁磁性金属的细颗粒或分散在粘合剂中的铁磁性六角铁氧体的微粒的铁磁性粉末，以及 磁盘具有小于5um的轨道宽度，并且可以记录位长度小于0.5μm的信号，其中轨道宽度与铁磁颗粒的平均长轴长度或平板状直径的比率为50至100， 铁磁颗粒的最短位长与平均长轴长度或平板状直径之比为3〜20，磁性层的厚度变化系数为0.5以下，以标准偏差与 磁性层的平均厚度。
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公开(公告)号：US06432503B1
公开(公告)日：2002-08-13
申请号：US09052033
申请日：1998-03-30
申请人： Masahi Aonuma , Shinji Saito , Hitoshi Noguchi , Nobuo Yamazaki
发明人： Masahi Aonuma , Shinji Saito , Hitoshi Noguchi , Nobuo Yamazaki
IPC分类号： G11B5706
摘要： A magnetic recording medium is described, which comprises a support having thereon a magnetic layer comprising a ferromagnetic metal powder dispersed in a binder, which is a magnetic recording medium for recording signals of from 0.17 to 2 G bit/inch2 of areal recording density, wherein the coercive force of said magnetic layer is 1,800 Oe or more, said ferromagnetic metal powder comprises Fe and Co, and the atomic ratio of Al/(Fe+Co) is from 3.0 to 15.4%.
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公开(公告)号：US06254964B1
公开(公告)日：2001-07-03
申请号：US09267929
申请日：1999-03-08
IPC分类号： G11B0570
CPC分类号： G11B5/71 , G11B5/70 , G11B5/714 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium is disclosed, which comprises a support having thereon a substantially nonmagnetic lower layer and a magnetic layer comprising a ferromagnetic metal powder or a ferromagnetic hexagonal ferrite powder dispersed in a binder formed on the lower layer, which is a magnetic recording medium for recording signals having areal recording density of from 0.17 to 2 G bit/inch2, wherein the coercive force of the magnetic layer is 1,800 Oe or more, the average long axis length of the ferromagnetic metal powder is 0.15 &mgr;m or less, and the average particle size of the ferromagnetic hexagonal ferrite powder is 0.10 &mgr;m or less; or wherein the dry thickness of the magnetic layer is from 0.05 to 0.30 &mgr;m, &phgr;m is from 10.0×10−3 to 1.0×10−3 emu/cm2, and the coercive force of the magnetic layer is 1,800 Oe or more. The object of the present invention is to provide a magnetic recording medium which is markedly improved in electromagnetic characteristics, particularly, high density recording characteristics, and is excellent in durability: and to provide a high capacity magnetic recording medium, in particular, a disc-like magnetic recording medium, having a high recording capacity of from 0.17 to 2 Gbit/inch2.
摘要翻译： 公开了一种磁记录介质，其包括其上具有基本上非磁性的下层的支撑体和包含分散在形成在下层上的粘合剂中的铁磁性金属粉末或铁磁性六角铁氧体粉末的磁性层，所述粘合剂是用于 具有0.17〜2G比特/英寸2的面密度记录密度的记录信号，其中磁性层的矫顽力为1800Oe以上，强磁性金属粉末的平均长轴长度为0.15μm以下，平均粒子 铁磁六角铁氧体粉末的尺寸为0.10μm以下; 或其中磁性层的干厚度为0.05至0.30μm，phim为10.0×10 -3至1.0×10 -3 emu / cm 2，并且磁性层的矫顽力为1800Oe以上。 本发明提供一种在电磁特性，特别是高密度记录特性方面显着提高的磁记录介质，并且耐久性优异：并提供高容量磁记录介质，特别是提供一种盘状磁记录介质 具有0.17至2Gbit / inch2的高记录容量。
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公开(公告)号：US5292597A
公开(公告)日：1994-03-08
申请号：US777147
申请日：1991-10-16
申请人： Hitoshi Noguchi , Shinji Saito , Hiroshi Ogawa
发明人： Hitoshi Noguchi , Shinji Saito , Hiroshi Ogawa
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/257
摘要： A magnetic recording medium having excellent electromagnetic characteristics and well adapted for video use, which comprises a non-magnetic support having provided thereon at least two magnetic layers each comprising a ferromagnetic powder and a binder resin, wherein the uppermost magnetic layer arranged farthest from the support contains a cobalt-containing iron oxide powder having an Fe.sup.2+ /Fe.sup.3+ mole ratio of 20/100 to 50/100 and a coercive force of 650 to 1,500 Oe, and at least one of said magnetic layers is a lower magnetic layer in contact with the uppermost magnetic layer and contains a cobalt-containing iron oxide powder having an Fe.sup.2+ /Fe.sup.3+ mole ratio of less than 20/100 and a coercive force of 0.6 to 1.0 times that of the cobalt-containing iron oxide powder contained in the uppermost magnetic layer.
摘要翻译： 一种具有优异的电磁特性并且非常适合于视频使用的磁记录介质，其包括非磁性载体，其上设置有至少两个磁性层，每个磁性层包含铁磁性粉末和粘合剂树脂，其中最上层的磁性层布置在与载体 含有Fe 2+ / Fe 3+摩尔比为20/100〜50/100，矫顽力为650〜1500Oe的钴的氧化铁粉末，并且所述磁性层中的至少一个是与 并且含有Fe 2+ / Fe 3+摩尔比小于20/100的钴的氧化铁粉末和矫顽力为包含在最上层磁性层中的含钴氧化铁粉末的矫顽力的0.6〜1.0倍。
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公开(公告)号：US20060024533A1
公开(公告)日：2006-02-02
申请号：US11237973
申请日：2005-09-29
申请人： Shinji Saito , Hitoshi Noguchi , Nobuo Yamazaki
发明人： Shinji Saito , Hitoshi Noguchi , Nobuo Yamazaki
IPC分类号： G11B5/708
CPC分类号： G11B5/70678 , G11B5/70 , G11B5/714
摘要： Provided is a magnetic recording medium exhibiting good electromagnetic characteristics in high-density recording The magnetic recording medium employed for magnetically recording signals with a track width equal to or less than 2.0 μm and reproducing the magnetically recorded signals, wherein said magnetic recording medium comprises a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder or comprises a nonmagnetic layer comprise a nonmagnetic powder and a binder and a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder in this order on a nonmagnetic support. Said magnetic layer has a thickness equal to or less than 0.2 μm, and said hexagonal ferrite ferromagnetic powder has an average plate diameter being 1/30 or less of the magnetically recorded track width as well as ½ or less of the thickness of the magnetic layer.
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公开(公告)号：US06855394B2
公开(公告)日：2005-02-15
申请号：US10178764
申请日：2002-06-25
申请人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
发明人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
CPC分类号： G11B5/706 , G11B5/7085 , Y10T428/24355 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium is disclosed, comprising a support having provided thereon a substantially nonmagnetic lower layer by coating a lower layer coating solution comprising a nonmagnetic powder dispersed in a binder and drying, and a layer having a thickness of from 0.01 to 0.15 μm by coating a magnetic layer coating solution comprising a ferromagnetic metal powder or a hexagonal ferrite powder dispersed in a binder, wherein the magnetic layer contains diamond particles having an average particle size of from 1/5 to 2 times the thickness of the magnetic layer in an amount of from 0.1 to 5.0 mass % based on the ferromagnetic metal powder.
摘要翻译： 公开了一种磁记录介质，其包括通过涂布包含分散在粘合剂中的非磁性粉末的下层涂布溶液和干燥而在其上设置有基本上非磁性的下层的载体，以及通过涂布具有0.01至0.15μm厚度的层 包含分散在粘合剂中的铁磁性金属粉末或六方铁氧体粉末的磁性层涂布液，其中所述磁性层含有平均粒度为磁性层厚度的1/5至2倍的金刚石颗粒，其量为 基于强磁性金属粉末为0.1〜5.0质量％。
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