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1. 发明授权

US06541132B2 Magnetic disk having specific track width and bit length 失效
标题翻译：磁盘具有特定的磁道宽度和位长度
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。

2. 发明授权

US06703106B2 Magnetic recording and reproducing method and magnetic recording medium for use in the method 有权
标题翻译：用于该方法的磁记录和再现方法和磁记录介质
公开(公告)号：US06703106B2
公开(公告)日：2004-03-09
申请号：US10126616
申请日：2002-04-22
申请人： Hitoshi Noguchi , Takeshi Harasawa , Shinji Saito
发明人： Hitoshi Noguchi , Takeshi Harasawa , Shinji Saito
IPC分类号： G11B502
CPC分类号： G11B5/7085 , G11B5/00 , G11B5/70605 , G11B5/70678 , G11B2005/0016 , Y10T428/115 , Y10T428/25
摘要： A magnetic recording and reproducing method comprising recording and reproducing a signal with a magnetic head in a track width (A) of less than 5 &mgr;m on a magnetic recording medium comprising a support having provided thereon a magnetic layer containing at least a ferromagnetic powder, an abrasive and a binder, wherein the average longer size (B) of the abrasive particle(s) which are present on the magnetic layer surface is ⅓ or less of the track width (A).
摘要翻译：一种磁记录和再现方法，包括在磁记录介质上记录和再现具有小于5μm的磁道宽度（A）的磁头的信号，所述磁记录介质包括其上设置有至少含有铁磁性粉末的磁性层的支撑体，研磨剂和粘合剂，其中存在于磁性层表面上的磨料颗粒的平均较长尺寸（B）为轨道宽度（A）的1/3或更小。

3. 发明授权

US06713149B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06713149B2
公开(公告)日：2004-03-30
申请号：US10194245
申请日：2002-07-15
申请人： Takeshi Harasawa , Hitoshi Noguchi , Shinji Saito
发明人： Takeshi Harasawa , Hitoshi Noguchi , Shinji Saito
IPC分类号： G11B5706
CPC分类号： G11B5/70 , G11B5/70678 , G11B5/714 , Y10T428/12951 , Y10T428/12993 , Y10T428/249953 , Y10T428/249979 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium is disclosed, comprising a support having provided thereon a magnetic layer containing a ferromagnetic powder and a binder as main components, wherein the ferromagnetic powder is a hexagonal ferrite powder having an average tabular diameter of from 15 to 40 nm, the perpendicular factor of squareness ratio SQ of the magnetic layer is from 0.1 to 0.55, the specific surface area and the total pore volume per weight of the magnetic layer by a nitrogen adsorption method are from 0.1 to 50 m2/g and from 0.001 to 1 ml/g, respectively, and the magnetic layer thickness is from 0.02 to 0.3 &mgr;m.
摘要翻译：公开了一种磁记录介质，包括一个在其上提供了含有铁磁粉末和粘结剂作为主要成分的磁性层的载体，其中铁磁粉末是平均片状直径为15至40nm的六方铁氧体粉末，垂直于磁性层的矩形比SQ的因子为0.1〜0.55，通过氮吸附法的磁性层的比表面积和总细孔容积为0.1〜50m 2 / g，0.001〜 1ml / g，磁性层厚度为0.02〜0.3μm。

4. 发明授权

US06506470B2 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US06506470B2
公开(公告)日：2003-01-14
申请号：US09855574
申请日：2001-05-16
申请人： Takeshi Harasawa , Hiroshi Hashimoto , Hitoshi Noguchi , Shinji Saito
发明人： Takeshi Harasawa , Hiroshi Hashimoto , Hitoshi Noguchi , Shinji Saito
IPC分类号： G11B5708
CPC分类号： G11B5/71 , G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/265
摘要： The present invention provides a magnetic recording medium having high electromagnetic transfer characteristics in a high-density recording medium. The invention provides a magnetic recording medium, which comprises a nonmagnetic primer layer placed on a nonmagnetic support member and at least one layer of magnetic layers with ferromagnetic powder dispersed in a binder, said magnetic layer being placed on said primer layer, whereby diamond particles with average particle size of 0.05 to 1 &mgr;m are added to the magnetic layer, and at least one type of compound selected from the following genera formulae (1) and (2) is contained: where R1 represents an alkyl group having 1 to 2 carbon atoms; and R2, R3 and R4 each represents a hydrocarbon group having 4 to 21 carbon atoms.
摘要翻译：本发明提供一种在高密度记录介质中具有高电磁传递特性的磁记录介质。本发明提供了一种磁记录介质，其包括放置在非磁性支撑构件上的非磁性底漆层和分散在粘合剂中的铁磁粉末的至少一层磁性层，所述磁性层置于所述底漆层上，由此金刚石颗粒与将平均粒径为0.05〜1μm的粒子添加到磁性层中，并且含有至少一种选自下列通式（1）和（2）的化合物：其中R 1表示具有1至2个碳原子的烷基 ; 并且R 2，R 3和R 4各自表示碳原子数为4〜21的烃基。

5. 发明授权

US07108903B2 Magnetic disc medium 失效
标题翻译：磁盘介质
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
IPC分类号： G11B5/82 , B65D85/30
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。

6. 发明授权

US06893701B2 Magnetic disk medium 失效
标题翻译：磁盘介质
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
IPC分类号： G11B5/012 , G11B5/706 , G11B5/73 , G11B5/738 , G11B5/82 , G11B11/08
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。

7. 发明授权

US06797373B2 Magnetic recording medium 有权
标题翻译：磁记录介质
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。

8. 发明授权

US06773783B2 Magnetic recording medium in the form of a disc 失效
标题翻译：磁盘形式的磁记录介质
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。

9. 发明授权

US06432503B1 Magnetic recording medium 失效
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%.

10. 发明授权

US06254964B1 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06254964B1
公开(公告)日：2001-07-03
申请号：US09267929
申请日：1999-03-08
申请人： Shinji Saito , Hitoshi Noguchi , Nobuo Yamazaki , Junichi Nakamikawa
发明人： Shinji Saito , Hitoshi Noguchi , Nobuo Yamazaki , Junichi Nakamikawa
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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