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    • 25. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US06797373B2
    • 2004-09-28
    • US10187829
    • 2002-07-05
    • Hitoshi NoguchiNobuo YamazakiShinji Saito
    • Hitoshi NoguchiNobuo YamazakiShinji Saito
    • G11B568
    • G11B5/738G11B5/70Y10T428/256Y10T428/26Y10T428/265
    • 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.
    • 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。
    • 27. 发明授权
    • Magnetic disk having specific track width and bit length
    • 磁盘具有特定的磁道宽度和位长度
    • US06541132B2
    • 2003-04-01
    • US09892858
    • 2001-06-28
    • Hitoshi NoguchiShinji SaitoTakeshi Harasawa
    • Hitoshi NoguchiShinji SaitoTakeshi Harasawa
    • G11B5012
    • G11B5/70678G11B5/70G11B5/70621
    • 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.
    • 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。
    • 29. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US06254964B1
    • 2001-07-03
    • US09267929
    • 1999-03-08
    • Shinji SaitoHitoshi NoguchiNobuo YamazakiJunichi Nakamikawa
    • Shinji SaitoHitoshi NoguchiNobuo YamazakiJunichi Nakamikawa
    • G11B0570
    • G11B5/71G11B5/70G11B5/714Y10T428/25Y10T428/256Y10T428/257Y10T428/265
    • 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.
    • 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。
    • 30. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5292597A
    • 1994-03-08
    • US777147
    • 1991-10-16
    • Hitoshi NoguchiShinji SaitoHiroshi Ogawa
    • Hitoshi NoguchiShinji SaitoHiroshi Ogawa
    • G11B5/706C09D5/23C09D7/12G11B5/716B32B5/16G11B5/66
    • G11B5/716Y10S428/90Y10T428/257
    • 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.
    • 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。