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1. 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。

2. 发明授权

US06458432B1 Process for producing magnetic disk 失效
公开(公告)号：US06458432B1
公开(公告)日：2002-10-01
申请号：US09995274
申请日：2001-11-26
申请人： Hitoshi Noguchi , Junichi Nakamikawa , Shinji Saito
发明人： Hitoshi Noguchi , Junichi Nakamikawa , Shinji Saito
IPC分类号： H01F100
CPC分类号： G11B5/845 , G11B5/70678 , Y10S428/90
摘要： A process for producing a magnetic disk having a randomly oriented magnetic powder, comprises: applying a magnetic coating solution containing at least a magnetic powder to a web that is being continuously conveyed, so as to prepare a magnetic layer; applying a first external magnetic field to the magnetic layer while the magnetic layer is wet; and applying a second external magnetic field to the magnetic layer while the magnetic layer is wet, wherein: the first external magnetic field is applied with a set of a first pair of same-pole-opposed magnets with the web interposed therebetween and a second pair of same-pole-opposed magnets with the web interposed therebetween; the first and second pairs are provided on the same plane of the web and on two equal sides of an isosceles triangle so that a perpendicular line dropped from a base of the isosceles triangle forms a line perpendicular to a conveying direction of the web; and the second external magnetic field is an alternating magnetic field, and is applied with a pair of magnets with the web interposed therebetween; the pair of magnets being provided on the same plane of the web, and in a direction perpendicular to the conveying direction of the web.

3. 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.

4. 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％。

5. 发明申请

US20050013046A1 Magnetic recording and reproduction method 失效
标题翻译：磁记录和再现方法
公开(公告)号：US20050013046A1
公开(公告)日：2005-01-20
申请号：US10890090
申请日：2004-07-14
申请人： Hitoshi Noguchi , Ayako Matsumoto , Shinji Saito
发明人： Hitoshi Noguchi , Ayako Matsumoto , Shinji Saito
IPC分类号： G11B5/00 , G11B5/012 , G11B5/016 , G11B5/58 , G11B5/706 , G11B5/82
CPC分类号： G11B5/016 , G11B5/012 , G11B5/58 , G11B5/82 , G11B2005/001 , G11B2005/0016
摘要： A magnetic recording and reproduction method comprising recording or reproducing a track of a rotating magnetic disk by means of a magnetic head, wherein the magnetic disk comprises a support and a magnetic layer containing ferromagnetic powder and a binder; the track has a breadth of 2 μm or less; and a frictional force between the magnetic layer and the magnetic head at innermost peripheral area of a recording region of the magnetic disk is 30 mN or less, a frictional force between the magnetic layer and a magnetic head at outermost peripheral area of a recording region of the magnetic disk is 20 mN or less, and a ratio of the frictional force at the innermost peripheral area to the frictional force at the outermost peripheral area is from 1.0 to 4.0.
摘要翻译：一种磁记录和再现方法，包括通过磁头记录或再现旋转磁盘的轨道，其中磁盘包括支撑件和包含铁磁粉末和粘合剂的磁性层; 轨道的宽度为2 mum以下; 并且在磁盘的记录区域的最内周区域处的磁性层和磁头之间的摩擦力为30mN以下，磁性层与记录区域的最外周区域的磁头之间的摩擦力磁盘为20mN以下，最外围区域的摩擦力与最外周面积的摩擦力的比为1.0〜4.0。

6. 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。

7. 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％。

8. 发明授权

US5318828A Magnetic recording medium having multiple magnetic layers comprising magnetic particles and polyurethane resins having glass transition temperatures within specified ranges 失效
标题翻译：磁记录介质具有多个包含磁性颗粒的磁性层和具有玻璃化转变温度在特定范围内的聚氨酯树脂
公开(公告)号：US5318828A
公开(公告)日：1994-06-07
申请号：US26164
申请日：1993-03-01
申请人： Hitoshi Noguchi , Shinji Saito , Hiroshi Ogawa
发明人： Hitoshi Noguchi , Shinji Saito , Hiroshi Ogawa
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/714 , G11B5/716 , G11B5/00
CPC分类号： G11B5/7021 , G11B5/716 , Y10S428/90 , Y10T428/24942 , Y10T428/24975 , Y10T428/256 , Y10T428/265 , Y10T428/3158 , Y10T428/31591 , Y10T428/31609 , Y10T428/31935
摘要： A magnetic recording medium is disclosed comprising a non-magnetic support having provided thereon a plurality of magnetic layers containing a ferromagnetic powder dispersed in a binder, wherein the lower magnetic layer closest to the support contains as the binder at least one polyurethane resin having a glass transition temperature (Tg) of from -50.degree. C. to -10.degree. C., and the uppermost magnetic layer contains as the binder at least one polyurethane resin having a glass transition temperature of from more than 40.degree. C. to 100 .degree. C.The magnetic recording medium of the present invention exhibits excellent running durability as well as electromagnetic conversion characteristics.
摘要翻译：公开了一种磁记录介质，其包括非磁性载体，其上设置有多个含有分散在粘合剂中的铁磁粉末的磁性层，其中最靠近载体的下磁性层含有至少一种具有玻璃的聚氨酯树脂作为粘合剂转变温度（Tg）为-50℃至-10℃，最上层的磁性层含有玻璃化转变温度高于40℃至100℃的至少一种聚氨酯树脂作为粘合剂本发明的磁记录介质具有优异的运行耐久性以及电磁转换特性。

9. 发明授权

US07092210B2 Magnetic recording and reproduction method 失效
标题翻译：磁记录和再现方法
公开(公告)号：US07092210B2
公开(公告)日：2006-08-15
申请号：US10890090
申请日：2004-07-14
申请人： Hitoshi Noguchi , Ayako Matsumoto , Shinji Saito
发明人： Hitoshi Noguchi , Ayako Matsumoto , Shinji Saito
IPC分类号： G11B5/82
CPC分类号： G11B5/016 , G11B5/012 , G11B5/58 , G11B5/82 , G11B2005/001 , G11B2005/0016
摘要： A magnetic recording and reproduction method comprising recording or reproducing a track of a rotating magnetic disk by means of a magnetic head, wherein the magnetic disk comprises a support and a magnetic layer containing ferromagnetic powder and a binder; the track has a breadth of 2 μm or less; and a frictional force between the magnetic layer and the magnetic head at innermost peripheral area of a recording region of the magnetic disk is 30 mN or less, a frictional force between the magnetic layer and a magnetic head at outermost peripheral area of a recording region of the magnetic disk is 20 mN or less, and a ratio of the frictional force at the innermost peripheral area to the frictional force at the outermost peripheral area is from 1.0 to 4.0.
摘要翻译：一种磁记录和再现方法，包括通过磁头记录或再现旋转磁盘的轨道，其中磁盘包括支撑件和包含铁磁粉末和粘合剂的磁性层; 轨道的宽度为2 mum以下; 并且在磁盘的记录区域的最内周区域的磁性层和磁头之间的摩擦力为30mN以下，磁性层与记录区域的最外周区域的磁头之间的摩擦力磁盘为20mN以下，最外围区域的摩擦力与最外周面积的摩擦力的比为1.0〜4.0。

10. 发明授权

US06790522B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06790522B2
公开(公告)日：2004-09-14
申请号：US10252417
申请日：2002-09-24
申请人： Nobuo Yamazaki , Hitoshi Noguchi , Shinji Saito
发明人： Nobuo Yamazaki , Hitoshi Noguchi , Shinji Saito
IPC分类号： G11B5712
CPC分类号： G11B5/70678 , G11B5/712
摘要： A magnetic recording medium comprising a support having provided thereon a magnetic layer containing a barium ferrite powder dispersed in a binder, wherein the concentration of Ba of the extract obtained by the following condition is 20 ppm or less per m2 of the magnetic recording medium: condition: 0.05 m2 of the magnetic recording medium is arbitrarily cut out and put in a 200 ml beaker with 100 ml of distilled water, the beaker is covered with a watch glass and retained in a constant temperature bath at 75° C. for 3 hours.
摘要翻译：一种磁记录介质，包括在其上设置有分散在粘合剂中的铁氧体粉末的磁性层的支撑体，其中通过以下条件获得的提取物的Ba浓度为每m 2磁记录20ppm以下介质：条件：将0.05m 2的磁记录介质任意切出，并用100ml蒸馏水放入200ml烧杯中，用手表玻璃覆盖烧杯，并保持在75℃的恒温浴中 C. 3小时。

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