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    Magnetic recording medium comprising a ferromagnetic metal film and two carbon protective layers
    4.
    发明授权
    Magnetic recording medium comprising a ferromagnetic metal film and two carbon protective layers 失效
    磁记录介质包括强磁性金属膜和两个碳保护层

    公开(公告)号：US5364690A

    公开(公告)日：1994-11-15

    申请号：US964861

    申请日：1992-10-22

    申请人： Kiyoshi Takahashi ,  Mikio Murai ,  Masaru Odagiri ,  Hideyuki Ueda ,  Yukikazu Ohchi ,  Tatsuya Hiwatashi

    发明人： Kiyoshi Takahashi ,  Mikio Murai ,  Masaru Odagiri ,  Hideyuki Ueda ,  Yukikazu Ohchi ,  Tatsuya Hiwatashi

    IPC分类号： G11B5/64 ,  G11B5/72 ,  G11B5/73 ,  G11B5/00

    CPC分类号： G11B5/72 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/24975 ,  Y10T428/24983 ,  Y10T428/265 ,  Y10T428/30

    摘要： A magnetic recording medium comprising: a non-magnetic substrate; a ferromagnetic metal thin film provided on the non-magnetic substrate; a filmlike first carbon layer provided on the ferromagnetic metal thin film; and a hard and amorphous second carbon layer provided on the first carbon layer; the first and second carbon layers having first and second Raman spectra based on Raman spectrophotometry, respectively; assuming that when each of the first and second Raman spectra is decomposed into a first band of Gaussian function having a peak in the vicinity of 1380 cm.sup.-1 and a second band of Gaussian function having a peak in the vicinity of 1550 cm.sup.-1 in X-Y rectangular coordinates with an X-axis expressed in cm.sup.-1 and a Y-axis indicative of spectral intensity, a ratio of an area enclosed by the first band and the X-axis to an area enclosed by the second band and the X-axis represents "relative intensity", the first carbon layer has a relative intensity of 2 to 20, while the second carbon layer has a relative intensity of 0.8 to 3, a Vickers hardness of not less than 1,000 kg/mm.sup.2 and a thickness of 50 to 300 .ANG..

    摘要翻译： 一种磁记录介质，包括：非磁性基板; 设置在非磁性基板上的铁磁金属薄膜; 设置在强磁性金属薄膜上的薄膜状的第一碳层; 以及设置在所述第一碳层上的硬质和无定形的第二碳层; 第一和第二碳层分别具有基于拉曼分光光度法的第一和第二拉曼光谱; 假设当第一和第二拉曼光谱中的每一个被分解成具有在1380cm -1附近的峰的第一高斯函数带和在1550cm -1附近具有峰的第二带高斯函数时 具有以cm-1表示的X轴和表示光谱强度的Y轴的XY直角坐标，由第一带和X轴包围的面积与由第二带包围的面积的比率， 轴表示“相对强度”，第一碳层的相对强度为2〜20，第二碳层的相对强度为0.8〜3，维氏硬度为1000kg / mm2以上，厚度为50 到300 ANGSTROM。

    Method for producing a magnetic recording medium having a carbon protective layer
    7.
    发明授权
    Method for producing a magnetic recording medium having a carbon protective layer 失效
    一种具有碳保护层的磁记录介质的制造方法

    公开(公告)号：US5798135A

    公开(公告)日：1998-08-25

    申请号：US724513

    申请日：1996-09-30

    申请人： Hideyuki Ueda ,  Hiroshi Seki ,  Kenji Kuwahara ,  Mikio Murai ,  Kiyosi Takahasi ,  Masaru Odagiri ,  Sadayuki Okazaki

    发明人： Hideyuki Ueda ,  Hiroshi Seki ,  Kenji Kuwahara ,  Mikio Murai ,  Kiyosi Takahasi ,  Masaru Odagiri ,  Sadayuki Okazaki

    IPC分类号： G11B5/64 ,  G11B5/72 ,  G11B5/84 ,  G11B5/85

    CPC分类号： G11B5/65 ,  G11B5/72 ,  G11B5/8408 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/30 ,  Y10T428/31 ,  Y10T428/3154 ,  Y10T428/31678

    摘要： A ferromagnetic metal thin film recording medium having a nonmagnetic substrate, a ferromagnetic metal thin film formed on the nonmagnetic substrate, a dry etched layer which is formed in a surface layer of the ferromagnetic metal thin film and contains oxygen atoms in a higher concentration than the remaining part of the ferromagnetic metal thin film, a hard carbonaceous film formed on the dry etched layer of the ferromagnetic metal thin film, a lubricant layer formed on said hard carbonaceous film, and optionally a modified layer which is formed on the hard carbonaceous film and has a thickness of less than 3 nm, and comprises carbon, nitrogen and oxygen atoms with an atomic ratio of nitrogen to carbon being at least 0.8%, which recording medium has improved running stability, durability and weatherability while maintaining electromagnetic conversion characteristics.

    摘要翻译： 具有非磁性基板的铁磁性金属薄膜记录介质，形成在非磁性基板上的强磁性金属薄膜，形成在强磁性金属薄膜的表面层中并且含有比 铁磁金属薄膜的剩余部分，形成在强磁性金属薄膜的干蚀刻层上的硬质碳质膜，形成在所述硬质碳质膜上的润滑剂层，以及可选地形成在硬质碳膜上的改性层，以及 具有小于3nm的厚度，并且包含氮与碳的原子比至少为0.8％的碳，氮和氧原子，该记录介质具有改善的运行稳定性，耐久性和耐候性，同时保持电磁转换特性。

    Method for producing magnetic recording medium
    10.
    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：US5670107A

    公开(公告)日：1997-09-23

    申请号：US554243

    申请日：1995-11-08

    申请人： Kenji Kuwahara ,  Kiyosi Takahasi ,  Hideyuki Ueda ,  Noriyasu Echigo ,  Mikio Murai ,  Masaru Odagiri

    发明人： Kenji Kuwahara ,  Kiyosi Takahasi ,  Hideyuki Ueda ,  Noriyasu Echigo ,  Mikio Murai ,  Masaru Odagiri

    IPC分类号： G11B5/84 ,  B29C71/02

    CPC分类号： G11B5/84 ,  G11B5/8404

    摘要： A magnetic recording medium produced by treating a magnetic recording medium which comprises a non-magnetic substrate and a magnetic layer formed on said substrate in an atmosphere kept at a temperature of at least 50.degree. C., with applying a tension of 1 gf. or less per 10 mm width to said magnetic recording medium in a treating time which is in a range on or above a line having a slope of at least 5000 in terms of .DELTA.ln(L)/.DELTA.(1/T) and passing a point of 0.5 second at 100.degree. C., when ln(L) is Arrhenius plotted against an inverse of an absolute temperature T (1/T), which medium has suppressed change of magnetic properties with time and improved corrosion resistance.

    摘要翻译： 通过在保持在至少50℃的温度的气氛中，施加1gf的张力处理包括非磁性基底和形成在所述基底上的磁性层的磁记录介质而制备的磁记录介质。 处理时间在DELTA ln（L）/ DELTA（1 / T）的斜率至少为5000的线上或上方的范围内的处理时间内，通过 点在100℃为0.5秒，当ln（L）是Arrhenius相对于绝对温度T（1 / T）的倒数绘制时，该介质已经抑制磁性随时间的变化和改善的耐腐蚀性。