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.

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％。

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。

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％。

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。

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。

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%.

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。

公开(公告)号：US06791803B2

公开(公告)日：2004-09-14

申请号：US10218569

申请日：2002-08-15

申请人： Shinji Saito ,  Nobuo Yamazaki ,  Hitoshi Noguchi

发明人： Shinji Saito ,  Nobuo Yamazaki ,  Hitoshi Noguchi

IPC分类号： G11B502

CPC分类号： G11B5/714 ,  G11B5/70 ,  G11B5/70678 ,  Y10T428/257

摘要： Provided are a method of magnetic recording and reproducing capable of permitting high density recording on magnetic recording media even under the condition of high data transfer rates and yielding adequate recording and reproduction characteristics when an MR head is used in reproduction, and a magnetic recording medium capable of being used in this magnetic recording and reproducing method. The magnetic recording and reproducing method is a method for reproducing a signal magnetically recorded on a magnetic recording medium with a magnetoresistive (MR) head. The magnetic recording medium comprises a substantially nonmagnetic lower layer and a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder in this order on at least one side of a nonmagnetic support, in which said hexagonal ferrite ferromagnetic powder has a mean plate diameter ranging from 15 to 40 nm and a mean plate thickness ranging from 4 to 15 nm, and said magnetic layer has a coercive force Hc ranging from 143.3 to 318.4 kA/m, and said signal magnetically recorded has a maximum recording frequency ranging from 10 to 80 MHz.

摘要翻译： 提供了一种磁记录和再现方法，即使在高数据传输速率的条件下也能够在磁记录介质上进行高密度记录，并且当在再现中使用MR磁头时产生足够的记录和再现特性，以及能够使用磁记录介质 被用于这种磁记录和再现方法中。 磁记录和再现方法是一种利用磁阻（MR）磁头再现磁记录在磁记录介质上的信号的方法。 磁记录介质在非磁性载体的至少一侧上依次包括基本上非磁性的下层和包含六方铁素体铁磁粉末和粘合剂的磁性层，其中所述六方晶系铁氧体铁磁粉末的平均板直径范围为 15至40nm，平均板厚度范围为4至15nm，所述磁性层的矫顽力Hc为143.3至318.4kA / m，磁性记录的所述信号具有10至80MHz的最大记录频率 。

公开(公告)号：US5601916A

公开(公告)日：1997-02-11

申请号：US524680

申请日：1995-09-07

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 ,  G11B5/70 ,  G11B5/706 ,  G11B5/716 ,  G11B5/738

CPC分类号： G11B5/716 ,  G11B5/70 ,  G11B5/70678 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/265

摘要： A magnetic recording medium is described, which comprises a nonmagnetic support having thereon at least one magnetic layer containing ferromagnetic particles dispersed in a binder, wherein the magnetic recording medium has at least one magnetic layer containing at least hexagonal ferrite magnetic particles and the magnetic layer containing the hexagonal ferrite magnetic particles has a coercive force, Hc, of from 1,300 to 5,000 Oe, a ratio of the Hc to an anisotropic magnetic field HK thereof, Hc/HK, of from 0.30 to 1.0, and a squareness ratio of in-plane direction, SQ, of from 0.65 to 1.00.

摘要翻译： 描述了一种磁记录介质，其包括其上具有至少一个含有分散在粘合剂中的铁磁性颗粒的磁性层的非磁性载体，其中该磁记录介质具有至少一个至少含有六方晶系铁氧体磁性颗粒的磁性层和含有 六方晶系铁氧体磁性颗粒的矫顽力Hc为1,300-5,000Oe，Hc与各向异性磁场HK之比Hc / HK为0.30至1.0，平面比为 方向，SQ从0.65到1.00。