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    Magnetic recording medium and method for producing the same
    6.
    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。

    Continuous fabrication of thin film magnetic recording medium with vacuum deposition
    8.
    发明授权
    Continuous fabrication of thin film magnetic recording medium with vacuum deposition 失效
    连续制造具有真空沉积的薄膜磁记录介质

    公开(公告)号：US5679410A

    公开(公告)日：1997-10-21

    申请号：US462690

    申请日：1995-06-05

    申请人： Ryuji Sugita ,  Kiyokazu Tohma ,  Tatsuaki Ishida ,  Kazunari Yoshimoto

    发明人： Ryuji Sugita ,  Kiyokazu Tohma ,  Tatsuaki Ishida ,  Kazunari Yoshimoto

    IPC分类号： C23C14/24 ,  C23C14/22 ,  C23C14/34 ,  C23C14/56 ,  G11B5/85 ,  C23C14/00 ,  C23C14/04

    CPC分类号： G11B5/85 ,  C23C14/22 ,  C23C14/562

    摘要： A thin film magnetic recording medium is manufactured with vacuum deposition or sputtering technique. One or more reflectors are provided between the substrate and an evaporation source around a path through which evaporated atoms travel onto a substrate. When a thin film is deposited on a substrate, the one or more reflectors are heated above a melting point of an evaporation material to reflect evaporated atoms arriving them. Thus, atoms reflected by the one or more reflectors also contribute to deposition of a thin film as well as evaporated atoms arriving directly from the evaporation source, and deposition efficiency is improved. Such a reflector is also used to limit a boundary or the path through which evaporated atoms travel onto a substrate. Then, a range of incident angles of evaporated atoms onto the substrate is kept the same for a long time on deposition, and characteristics of the thin film are stable.

    摘要翻译： 使用真空沉积或溅射技术制造薄膜磁记录介质。 一个或多个反射器设置在基板和蒸发源之间的周围的蒸发原子行进到基板上的路径。 当薄膜沉积在基底上时，将一个或多个反射器加热到蒸发材料的熔点之上，以反射到达它们的蒸发原子。 因此，由一个或多个反射器反射的原子也有助于沉积薄膜以及从蒸发源直接到达的蒸发原子，并且提高了沉积效率。 这样的反射器也用于限制蒸发的原子通过其移动到衬底上的边界或路径。 然后，蒸镀原子在基板上的入射角度的范围在沉积时长时间保持相同，并且薄膜的特性是稳定的。

    Magnetic recording medium and method for producing the same
    10.
    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：US5427869A

    公开(公告)日：1995-06-27

    申请号：US103759

    申请日：1993-08-10

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

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

    IPC分类号： G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/85

    CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/85 ,  Y10S428/90

    摘要： A magnetic recording medium includes a nonmagnetic substrate and a magnetic layer which is formed on a surface of the substrate and which has an axis of easy magnetization inclined from a direction to normal plane of the layer. An angular dependency of coercive force, of the medium which is measured by changing an application angle of a magnetic field in a range relative to -90.degree. to +90.degree. from the plane of the layer with a plane normal to the layer and including the axis of easy magnetization, has two local maximum values and two local minimum values. A ratio of the local maximum value closer to a plane direction to the minimum value closer of the layer to the local plane direction of the layer is from 1.6 to 2.4, and the local maximum value closer to the plane direction of the layer is larger than the local maximum value closer to the line normal to of the plane of the layer. The medium has a high S/N ratio.

    摘要翻译： 磁记录介质包括非磁性基板和磁性层，该磁性层形成在基板的表面上，并且具有从层的方向到法线平面的易磁化轴。 介质的矫顽力的角度依赖性，其通过将具有与该层垂直的平面相对于-90°至+90°的范围内的磁场的施加角度改变而测量，并且包括 轴易于磁化，具有两个局部最大值和两个局部最小值。 局部最大值比平面方向的距离越接近层的距离越靠近层的局部平面方向的最小值的比值为1.6到2.4，并且更靠近层的平面方向的局部最大值大于 局部最大值越接近层的平面垂直线。 介质具有较高的S / N比。