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1. 发明申请

US20060024533A1 Magnetic recording medium 有权
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.

2. 发明授权

US06855394B2 Magnetic recording medium 失效
标题翻译：磁记录介质
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
IPC分类号： G11B5/70 , G11B5/706 , G11B5/708
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％。

3. 发明授权

US06780503B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06780503B2
公开(公告)日：2004-08-24
申请号：US10281947
申请日：2002-10-29
申请人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
发明人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
IPC分类号： G11B5702
CPC分类号： G11B5/7021 , G11B5/7023 , G11B5/70678 , G11B5/7085 , G11B5/714 , Y10T428/256 , Y10T428/31609
摘要： A magnetic recording medium comprising: a nonmagnetic support; and at least one magnetic layer comprising a ferromagnetic hexagonal ferrite powder and a binder, wherein the magnetic layer comprises diamond particles having an average particle size of 0.03 to 0.5 &mgr;m in a ratio of 0.1 to 5% by weight to the ferromagnetic hexagonal ferrite powder, the ferrite hexagonal ferrite powder has an average tabular diameter of 5 to 40 nm, and the binder is at least one of: (i) a binder comprising from 0.2 to 0.7 meq/g of at least one polar group selected from —SO3M, —OSO3M, —PO(OM)2, —OPO(OM)2 and —COOM, wherein M represents a hydrogen atom, an alkali metal or ammonium, and (ii) a binder comprising from 0.5 to 5 meq/g of at least one polar group selected from —CONR1R2, —NR1R2 and —N+R1R2R3 wherein R1, R2 and R3 each independently represents a hydrogen atom or an alkyl group.
摘要翻译：一种磁记录介质，包括：非磁性载体; 以及包含铁磁性六角铁氧体粉末和粘合剂的至少一个磁性层，其中所述磁性层包含平均粒度为0.03-0.5μm，相对于铁磁性六角铁氧体粉末为0.1-5wt％的金刚石颗粒，所述铁氧体六角铁氧体粉末的平均片状直径为5〜40nm，所述粘合剂为以下中的至少一种：（i）包含0.2〜0.7meq / g的至少一种选自-SO 3 M， OSO3M，-PO（OM）2，-OPO（OM）2和-COOM，其中M表示氢原子，碱金属或铵，和（ii）包含0.5-5meq / g至少一种选自-CONR1R2，-NR1R2和-N + R1R2R3的极性基团，其中R1，R2和R3各自独立地表示氢原子或烷基。

4. 发明授权

US06677036B2 Method for producing magnetic recording medium and magnetic recording medium 有权
标题翻译：磁记录介质和磁记录介质的制造方法
公开(公告)号：US06677036B2
公开(公告)日：2004-01-13
申请号：US10281996
申请日：2002-10-29
申请人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
发明人： Hitoshi Noguchi , Nobuo Yamazaki , Shinji Saito
IPC分类号： B05D512
CPC分类号： G11B5/70678 , G11B5/7021 , G11B5/7023 , Y10S428/90
摘要： A method for producing a magnetic recording medium comprising: dispersing at least a binder and a ferromagnetic hexagonal ferrite powder to prepare a magnetic coating; and applying the magnetic coating to provide at least one magnetic layer, wherein the binder is at least one of: (a) a binder comprising 0.2 to 0.7 meq/g of at least one polar group selected from —SO3M, —OSO3M, —PO(OM)2, —OPO(OM)2 and —COOM wherein M represents a hydrogen atom, an alkali metal or ammonium; and (b) a binder comprising 0.5 to 5 meq/g of at least one polar group selected from —CONR1R2, —NR1R2 and —N+R1R2R3 wherein R1, R2 and R3 each independently represents a hydrogen atom or an alkyl group, and the ferromagnetic hexagonal ferrite powder has an average tabular diameter of from 10 to 40 nm and a water content of from 0.3 to 3% by weight.
摘要翻译：一种制造磁记录介质的方法，包括：分散至少一种粘结剂和一种铁磁性六角铁氧体粉末以制备磁性涂层; 以及施加所述磁性涂层以提供至少一个磁性层，其中所述粘合剂是以下至少一种：（a）包含0.2至0.7meq / g的至少一种选自-SO 3 M，-OSO 3 M，-PO （OM）2，-OPO（OM）2和-COOM，其中M表示氢原子，碱金属或铵; 和（b）包含0.5-5meq / g至少一种选自-CONR1R2，-NR1R2和-N + R1R2R3的极性基团的粘合剂，其中R1，R2和R3各自独立地表示氢原子或烷基，铁磁六方铁氧体粉末的平均片状直径为10〜40nm，水含量为0.3〜3重量％。

5. 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。

6. 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。

7. 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%.

8. 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。

9. 发明授权

US07515383B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US07515383B2
公开(公告)日：2009-04-07
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： G11B5/02 , G11B5/48 , G11B5/714
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.
摘要翻译：提供了一种在高密度记录中表现出良好电磁特性的磁记录介质。磁记录介质，用于磁记录磁道宽度等于或小于2.0μm的信号，并再现磁记录信号，其中所述磁记录介质包括磁包含六方晶系铁氧体铁磁性粉末和粘合剂的层或包含非磁性层的非磁性层在非磁性载体上依次包含非磁性粉末和粘合剂以及包含六方晶系铁磁铁磁性粉末和粘合剂的磁性层。所述磁性层具有等于或小于0.2μm的厚度，并且所述六方晶系铁氧体铁磁粉末的平均板直径是磁记录磁道宽度的1/30或更小，以及磁层的厚度的1/2或更小。

10. 发明授权

US5714275A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5714275A
公开(公告)日：1998-02-03
申请号：US571397
申请日：1995-12-13
申请人： Nobuo Yamazaki , Hitoshi Noguchi , Shinji Saito
发明人： Nobuo Yamazaki , Hitoshi Noguchi , Shinji Saito
IPC分类号： C09D5/23 , C09D7/12 , G11B5/68 , G11B5/706 , G11B5/716 , G11B5/73 , G11B5/738 , G11B5/66 , G11B5/70
CPC分类号： G11B5/738 , G11B5/70605 , G11B5/716 , Y10S428/90
摘要： A magnetic recording medium is described, comprising a nonmagnetic support having provided thereon at least a magnetic layer comprising ferromagnetic metal particles dispersed in a binder, wherein the magnetic layer has a coercive force, Hc, of from 1,500 to 4,000 Oe and an Hc/HK ratio of Hc to an anisotropy field, HK, of from 0.30 to 1.00.
摘要翻译：描述了一种磁记录介质，其包括至少在其上设置有分散在粘合剂中的铁磁性金属颗粒的磁性层的非磁性载体，其中该磁性层具有1,500至4000ee的矫顽力Hc和Hc / HK Hc与各向异性场的比值HK为0.30〜1.00。

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