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公开(公告)号：US06254964B1
公开(公告)日：2001-07-03
申请号：US09267929
申请日：1999-03-08
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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公开(公告)号：US06458432B1
公开(公告)日：2002-10-01
申请号：US09995274
申请日：2001-11-26
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.
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3.发明授权公开(公告)号：US06444290B1
公开(公告)日：2002-09-03
申请号：US09329150
申请日：1999-06-09
IPC分类号： G11B5733
CPC分类号： G11B5/7085 , G11B5/70678 , Y10T428/24355 , Y10T428/24372 , Y10T428/25 , Y10T428/26 , Y10T428/2982
摘要： A magnetic recording medium is described, 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 provided on the lower layer, which is a magnetic recording medium for recording signals of from 0.17 to 2 G bit/inch2 of areal recording density, 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, the coercive force of the magnetic layer is 1,800 Oe or more, and a filler having an average particle size of from 0.05 to 0.3 &mgr;m is present on the surface layer of the support in an amount of from 5,000,000 to 30,000,000/mm2.
摘要翻译： 描述了一种磁记录介质，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下层中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 记录信号为0.17至2G比特/英寸2的面积记录密度，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，矫顽力 的磁性层为1800Oe以上，平均粒径为0.05〜0.3μm的填料以5,000,000〜30,000,000 / mm2的量存在于载体的表层上。
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公开(公告)号：US06291052B1
公开(公告)日：2001-09-18
申请号：US09106933
申请日：1998-06-29
IPC分类号： G11B573
CPC分类号： G11B5/70 , G11B5/70605 , G11B5/70678 , G11B5/708 , Y10S428/90 , Y10T428/24355 , Y10T428/256 , Y10T428/265
摘要： A magnetic recording medium 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 provided on the lower layer, 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 the magnetic layer is 1,800 Oe or more, and the thickness unevenness of the support is 5% or less of the thickness of the support.
摘要翻译： 一种磁记录介质，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下层中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，所述粘合剂是用于记录信号的信号的磁记录介质 面积记录密度为0.17至2G比特/英寸2，其中磁性层的矫顽力为1800Oe以上，并且载体的厚度不均匀度为载体厚度的5％以下。
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公开(公告)号：US06954317B2
公开(公告)日：2005-10-11
申请号：US10059259
申请日：2002-01-31
CPC分类号： G11B5/865 , G11B5/59633 , G11B5/82
摘要： When a master medium and a slave medium are brought into close contact and a transfer magnetic field is applied thereto to perform magnetic transfer, the leakage magnetic field intensity of the transfer magnetic field is regulated to within a permissible range, making possible the transfer of an exact magnetic pattern. After a magnetic field is applied to the slave face in the track direction thereof to initially magnetize the slave medium in the track direction, the master medium and the slave medium are brought into close contact. When applying a transfer magnetic field in the track direction of the slave face to perform a magnetic transfer, the magnetic field intensity component in the direction opposite that in which the transfer magnetic field is to be applied is regulated to less than or equal to ½ the magnetic coercive force Hcs of the slave medium over the entire slave surface.
摘要翻译： 当主介质和从属介质紧密接触并且传递磁场被施加到其上以执行磁传递时，传递磁场的泄漏磁场强度被调节在允许的范围内，使得可以传输 精确的磁性图案。 在从动面向跟踪方向施加磁场以使磁道方向最初磁化时，使主介质和从属介质紧密接触。 当在从动面的轨道方向上施加转移磁场以进行磁转移时，将要施加转印磁场的方向相反的方向的磁场强度分量调节到小于或等于½的1/2 从属介质的磁矫顽力Hcs在整个从动面上。
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公开(公告)号：US06777073B2
公开(公告)日：2004-08-17
申请号：US10354001
申请日：2003-01-30
IPC分类号： G11B566
摘要： A flexible magnetic recording medium includes a non-magnetic layer and a magnetic layer consisting of ferromagnetic powder dispersed in binder which are formed on a base sheet in this order. The ferromagnetic powder is not smaller than 158 kA/m in coercive force Hc(VSM) as measured by a vibrating sample magnetometer and is not larger than 100 in KuV/kT (wherein Ku represents an anisotropy constant, V represents a volume, k represents a Boltzmann constant and T represents an absolute temperature) which is a parameter of thermal fluctuation, and a magnetization pattern representing predetermined information has been formed on the magnetic layer by magnetic transfer.
摘要翻译： 柔性磁记录介质包括非磁性层和由分散在粘结剂中的铁磁性粉末构成的磁性层，该磁性层依次形成在基片上。 铁磁粉末在振动样品磁力计测得的矫顽力Hc（VSM）中不小于158kA / m，KuV / kT不大于100（其中Ku表示各向异性常数，V表示体积，k表示 玻尔兹曼常数和T表示绝对温度），其是热波动的参数，并且通过磁转移在磁性层上形成表示预定信息的磁化模式。
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