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    Magnetic recording medium and method for producing the same
    4.
    发明授权
    Magnetic recording medium and method for producing the same 有权
    磁记录介质及其制造方法

    公开(公告)号：US06242085B1

    公开(公告)日：2001-06-05

    申请号：US09153579

    申请日：1998-09-15

    申请人： Hiroshi Ryonai ,  Tatsuaki Ishida ,  Kiyokazu Tohma ,  Keizou Miyata ,  Taizou Hamada

    发明人： Hiroshi Ryonai ,  Tatsuaki Ishida ,  Kiyokazu Tohma ,  Keizou Miyata ,  Taizou Hamada

    IPC分类号： G11B566

    CPC分类号： G11B5/656 ,  G11B5/851 ,  G11B5/855 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

    摘要： An underlying layer is formed of Cr or the like on a glass substrate, and a magnetic layer is formed on the underlying layer by simultaneously sputtering a magnetic substance and a non-magnetic substance that does not form a solid solution with the magnetic substance in an atmosphere having a pressure of 30 mTorr to 75 mTorr. The magnetic recording medium comprises clusters, each of which is formed of aggregated magnetic grains, and a non-magnetic substance between the clusters. Each magnetic grain has a grain diameter of 5 nm to 20 nm. An average gap between the clusters is 1.5 nm to 5 nm. Thus, the present invention can provide a magnetic recording medium having a high S/N ratio that is suitable for high density recording.

    摘要翻译： 在玻璃基板上由Cr等形成下层，通过同时将磁性物质和不与磁性物质形成固溶体的非磁性物质同时溅射在基底层上而形成磁性层 压力为30mTorr至75mTorr的气氛。 磁记录介质包括由聚集的磁性颗粒形成的簇和簇之间的非磁性物质。 每个磁性颗粒具有5nm至20nm的粒径。 簇之间的平均间隙为1.5nm至5nm。 因此，本发明可以提供适用于高密度记录的具有高S / N比的磁记录介质。

    Magnetic recording medium and method for producing the same
    5.
    发明授权
    Magnetic recording medium and method for producing the same 失效
    磁记录介质及其制造方法

    公开(公告)号：US5554440A

    公开(公告)日：1996-09-10

    申请号：US118326

    申请日：1993-09-09

    申请人： Tatsuaki Ishida ,  Ryuji Sugita ,  Kiyokazu Tohma ,  Yasuaki Ban

    发明人： Tatsuaki Ishida ,  Ryuji Sugita ,  Kiyokazu Tohma ,  Yasuaki Ban

    IPC分类号： G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/85 ,  H01F1/11 ,  G11B5/70

    CPC分类号： G11B5/656 ,  G11B5/66 ,  G11B5/85 ,  Y10S428/90 ,  Y10T428/265

    摘要： A magnetic tape having a polymer substrate and a magnetic layer which is formed directly on a surface of the substrate or on a primer layer formed on the substrate and contains cobalt, oxygen and optionally nickel, in which a coercive force is at least 120 kA/m and a squareness ratio is at least 0.9 in a hysteresis loop which is obtained when a magnetic field is applied in a plane of the magnetic layer in a longitudinal direction of the magnetic tape, and on the hysteresis loop, an intensity of the applied magnetic field, at which a magnetization when the applied magnetic field is increased is 99% of the magnetization when the applied magnetic field is decreased, is not larger than 400 kA/m, and preferably, a ratio of a value of magnetization at an intersection between a tangential line drawn at a point which gives a residual magnetization at the applied magnetic field of 0 (zero) and a tangential line drawn at a point which gives a coercive force with a magnetization of 0 in a second quadrant to said residual magnetization is at least 0.9, which magnetic tape has improved high density recording/reproducing properties.

    摘要翻译： 一种具有聚合物基材和磁性层的磁带，其直接形成在基材的表面上或形成在基材上的底漆层上，并且含有钴，氧和任选的镍，矫顽力为至少120kA / m，当在磁带的纵向方向上的磁性层的平面中施加磁场时，在磁滞回线中，矩形比至少为0.9，在磁滞回线上，所施加的磁体的强度 当所施加的磁场增加时的磁化强度是施加的磁场减小时的磁化强度的99％，不大于400kA / m，优选地，在相交处的磁化强度的比值 在施加的磁场为0（零）的点处绘制的切线，以及在第二次给出磁化强度为0的矫顽力的点处画出的切线 所述残余磁化强度的象限至少为0.9，该磁带具有改善的高密度记录/再现特性。

    Magnetic transfer method and magnetic transfer apparatus
    8.
    发明授权
    Magnetic transfer method and magnetic transfer apparatus 失效
    磁转移方式和磁转移装置

    公开(公告)号：US06909565B2

    公开(公告)日：2005-06-21

    申请号：US10718136

    申请日：2003-11-20

    申请人： Hideyuki Hashi ,  Taizou Hamada ,  Tatsuaki Ishida ,  Kiyokazu Tohma

    发明人： Hideyuki Hashi ,  Taizou Hamada ,  Tatsuaki Ishida ,  Kiyokazu Tohma

    IPC分类号： G11B5/82 ,  G11B5/84 ,  G11B5/86 ,  G11B19/04 ,  G11B23/50

    CPC分类号： G11B5/82 ,  G11B5/84 ,  G11B5/865 ,  G11B19/04 ,  G11B23/505

    摘要： A magnetic transfer method includes a first step (ST103) of preparing a magnetic disk, a second step (ST105) of forming a layer of lubricant on the magnetic disk, a third step (ST108) of bringing a surface of the magnetic layer on the magnetic disk into close contact with a magnetic transfer master having a magnetic film formed on at least one side and magnetically transferring a pattern of the magnetic film on the magnetic transfer master onto the surface of the magnetic disk through application of an external magnetic field, and a fourth step (ST104, ST106) of burnishing at least a surface of the magnetic disk that comes into contact with the magnetic transfer master. The first step, the fourth step, the second step, the fourth step, and the third step are performed in the stated order.

    摘要翻译： 磁转移方法包括制备磁盘的第一步骤（ST 103），在磁盘上形成润滑剂层的第二步骤（ST105），使磁性表面形成的第三步骤（ST 108） 在磁盘上形成与形成在至少一个侧面上的具有磁性膜的磁性传递主体紧密接触，并通过施加外部磁体将磁性传递母版上的磁性膜的图案磁性传递到磁盘表面上 以及第四步骤（ST104，ST1010），其与至少与磁转移母盘接触的磁盘表面进行抛光。 第一步骤，第四步骤，第二步骤，第四步骤和第三步骤按照所述顺序进行。

    Master information magnetic recorder
    10.
    发明授权
    Master information magnetic recorder 失效
    主信息磁记录器

    公开(公告)号：US06611388B1

    公开(公告)日：2003-08-26

    申请号：US09646138

    申请日：2000-09-13

    申请人： Keizo Miyata ,  Tatsuaki Ishida ,  Taizou Hamada ,  Kiyokazu Tohma ,  Hiroshi Ryonai

    发明人： Keizo Miyata ,  Tatsuaki Ishida ,  Taizou Hamada ,  Kiyokazu Tohma ,  Hiroshi Ryonai

    IPC分类号： G11B586

    CPC分类号： G11B5/5526 ,  G11B5/00 ,  G11B5/59633 ,  G11B5/59688 ,  G11B5/82 ,  G11B5/865

    摘要： A master-information magnetic recording apparatus for recording preformat information signals into a magnetic recording medium using a ferromagnetic film pattern formed on a master information carrier, in which the pattern corresponds to the preformat information signals. With the master information carrier in contact with the magnetic recording medium, the ferromagnetic film pattern is magnetized by a magnetic field applying device. Thus, the preformat information signals are recorded into the magnetic recording medium. The magnetic field applying device is so constructed that the direction of magnetizing the ferromagnetic film pattern is perpendicular to a track-scanning orbit of a magnetic head in a recording and reproducing apparatus in which the magnetic recording medium is installed. It enables the magnetic head to gain sufficient reproduction amplitude for track-scanning for reproducing the information signals.

    摘要翻译： 一种主信息磁记录装置，用于使用形成在主信息载体上的铁磁膜图案将预格式化信息信号记录到磁记录介质中，其中图案对应于预格式化信息信号。 在主信息载体与磁记录介质接触的情况下，铁磁膜图案被磁场施加装置磁化。 因此，预格式化信息信号被记录在磁记录介质中。 磁场施加装置的结构使得铁磁膜图案的磁化方向垂直于安装有磁记录介质的记录和再现装置中的磁头的轨道扫描轨道。 它使磁头能够获得足够的再现幅度，用于轨道扫描以再现信息信号。