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    Magnetic recording medium and method for producing the same
    1.
    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。

    Method and apparatus for producing magnetic recording medium
    2.
    发明授权
    Method and apparatus for producing magnetic recording medium 失效
    制造磁记录介质的方法和装置

    公开(公告)号：US5472506A

    公开(公告)日：1995-12-05

    申请号：US367998

    申请日：1995-01-03

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

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

    IPC分类号： G11B5/85 ,  C23C14/00

    CPC分类号： G11B5/85

    摘要： A magnetic recording medium having good high density recording characteristics is produced by forming a magnetic layer on a substrate which is traveling around a peripheral surface of a cylindrical can by an oblique vapor deposition method to form a magnetic layer comprising cobalt, an axis of easy magnetization of which inclined from a line normal to the layer plane. A residual gas pressure in an initial region of the formation of the magnetic layer is kept as low as possible, in particular, the residual gas pressure in the initial region of the formation of the magnetic layer is lower than in the other part of the production apparatus.

    摘要翻译： 具有良好高密度记录特性的磁记录介质通过在通过倾斜气相沉积法绕圆筒形罐的周面行进的基板上形成磁性层来形成包含钴的磁性层，易磁化轴 其从垂直于层平面的线倾斜。 形成磁性层的初始区域中的残留气体压力尽可能地保持低，特别是形成磁性层的初始区域中的残余气体压力低于制造的其它部分 仪器。

    Method for producing magnetic recording medium
    3.
    发明授权
    Method for producing magnetic recording medium 失效
    磁记录介质的制造方法

    公开(公告)号：US5458914A

    公开(公告)日：1995-10-17

    申请号：US367996

    申请日：1995-01-03

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

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

    IPC分类号： G11B5/85 ,  H01F10/00

    CPC分类号： G11B5/85

    摘要： A magnetic recording medium having good high density recording characteristics is produced by forming a magnetic layer on a substrate which is traveling around a peripheral surface of a cylindrical can by an oblique vapor deposition method to form a magnetic layer comprising cobalt, an axis of easy magnetization of which inclined from a line normal to the layer plane. A residual gas pressure in an initial region of the formation of the magnetic layer is kept as low as possible, in particular, the residual gas pressure in the initial region of the formation of the magnetic layer is lower than in the other part of the production apparatus.

    摘要翻译： 具有良好高密度记录特性的磁记录介质通过在通过倾斜气相沉积法绕圆筒形罐的周面行进的基板上形成磁性层来形成包含钴的磁性层，易磁化轴 其从垂直于层平面的线倾斜。 形成磁性层的初始区域中的残留气体压力尽可能地保持低，特别是形成磁性层的初始区域中的残余气体压力低于制造的其它部分 仪器。

    Magnetic recording medium and method for producing the same
    4.
    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：US5418059A

    公开(公告)日：1995-05-23

    申请号：US70981

    申请日：1993-06-04

    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： G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/85 ,  G11B5/00

    CPC分类号： G11B5/66 ,  Y10T428/12465 ,  Y10T428/12931 ,  Y10T428/26 ,  Y10T428/265

    摘要： A magnetic recording medium having a nonmagnetic substrate, a first magnetic layer which is formed on a surface of the substrate, has an axis of easy magnetization slanting from a normal line of a layer plane, contains cobalt and oxygen in an amount of not more than 40 atomic % and has a thickness of not larger than 0.15 .mu.m, and a second magnetic layer which is formed on a surface of the first magnetic layer, contains cobalt, has an axis of easy magnetization slanting from a normal line of a layer plane, contains oxygen in an amount of not larger than 37 atomic % and from 61 % to 99 % of the oxygen concentration in the first layer, and has a thickness of not larger than 0.15 .mu.m, which medium has a large S/N ratio.

    摘要翻译： 具有非磁性基板的磁记录介质，形成在基板的表面上的第一磁性层具有从层平面的法线倾斜的易磁化轴，其含有不大于 40原子％，并且具有不大于0.15μm的厚度，并且形成在第一磁性层的表面上的含有钴的第二磁性层具有从层平面的法线倾斜的易磁化轴 含有第一层中氧浓度不大于37原子％和61％至99％的氧，并且具有不大于0.15μm的厚度，该介质具有大的S / N比 。

    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：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。