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    Magnetic recording medium
    21.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4464433A

    公开(公告)日：1984-08-07

    申请号：US357300

    申请日：1982-03-11

    Applicant: Kenji Hirabayashi ,  Hitoshi Azegami

    Inventor： Kenji Hirabayashi ,  Hitoshi Azegami

    IPC: G11B5/70 ,  G11B5/706 ,  B32B15/00 ,  B05D5/12

    CPC classification number: G11B5/70 ,  G11B5/70673 ,  Y10T428/263 ,  Y10T428/265

    Abstract: A magnetic recording medium which has dynamic range (I) of 70 dB or more and dynamic range (II) of 45 dB or more in control of a thickness of a magnetic layer and magnetic characteristics wherein said dynamic range (I) is given as a difference between an output at 3% input level of third harmonic wave output at a wavelength of 237.5 .mu.m in the optimum bias recording by a head having a recorded width of 1 to 1.1 mm based on an output of the original signal and a reproduced output calibrated by auditory sense calibration at non-signal recording in the bias and said dynamic range (II) is given as a difference between a saturated output at a wavelength of 4.75 .mu.m under the same condition and the reproduced output calibrated by the A-curve calibration at non-signal recording in the bias.

    Abstract translation: 具有70dB以上的动态范围（I）和45dB或更大的动态范围（II）的磁记录介质，用于控制磁性层的厚度和磁特性，其中所述动态范围（I）被给定为 基于原始信号的输出，记录宽度为1〜1.1mm的磁头在最佳偏置记录中，波长为237.5μm的三次谐波输出的3％输入电平的输出之间的差值，再生输出 通过在偏置下的非信号记录下的听觉校准校准，并且所述动态范围（II）被给定为在相同条件下波长4.75μm的饱和输出与通过A曲线校准的再现输出之间的差 校准在非信号记录的偏差。

    Magnetic recording medium
    26.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4756962A

    公开(公告)日：1988-07-12

    申请号：US41177

    申请日：1987-04-22

    Applicant: Shigeru Takamatsu ,  Hideo Dobashi ,  Hitoshi Azegami

    Inventor： Shigeru Takamatsu ,  Hideo Dobashi ,  Hitoshi Azegami

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708

    CPC classification number: G11B5/708 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

    Abstract: A magnetic recording medium, comprising a plastic base coated with a magnetic layer of a ferromagnetic powder dispersed in a resin binder, contains in the magnetic layer .alpha.-Al.sub.2 O.sub.3 particles with an average particle size of 0.1 to 0.3 .mu.m as determined by electron microscopy in an amount of more than 0.5% but less than 15% by weight on the basis of the ferromagnetic powder weight. The .alpha.-Al.sub.2 O.sub.3 particles have an .alpha.-transformation rate of at least 50%. The powder is produced by an organic alumina process.

    Abstract translation: 包含涂布有分散在树脂粘合剂中的铁磁性粉末的磁性层的塑料基体的磁记录介质在通过电子显微镜测定的平均粒径为0.1至0.3μm的磁性层中含有α-Al 2 O 3颗粒， 其量以铁磁粉末重量为基准，大于0.5重量％但小于15重量％。 α-Al2O3颗粒的α-转化率至少为50％。 该粉末由有机氧化铝工艺生产。

    Magnetic recording medium
    27.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4391877A

    公开(公告)日：1983-07-05

    申请号：US359421

    申请日：1982-03-18

    Applicant: Fujio Shibata ,  Hiroshi Kawahara ,  Hitoshi Azegami

    Inventor： Fujio Shibata ,  Hiroshi Kawahara ,  Hitoshi Azegami

    IPC: G11B5/708 ,  C09D5/23 ,  C09D7/12 ,  G11B5/71 ,  H01F10/02

    CPC classification number: G11B5/71 ,  Y10S428/90 ,  Y10T428/31678

    Abstract: A magnetic recording medium including a substrate having a magnetic coating layer thereon, said magnetic coating layer comprising ferromagnetic particles dispersed in a binder vehicle, characterized in that the magnetic coating layer contains one or more ketones selected from the compounds expressed by the general formula ##STR1## wherein R.sub.1 and R.sub.2 represent saturated or unsaturated chain aliphatic radicals, both or either of which have 11 to 22 carbon atoms and may contain hydroxyl, carboxyl or amino groups.

    Abstract translation: 一种包括其上具有磁性涂层的基板的磁记录介质，所述磁性涂层包含分散在粘合剂载体中的铁磁颗粒，其特征在于，所述磁性涂层含有一种或多种选自以下通式的化合物： >其中R 1和R 2表示饱和或不饱和的链脂肪族基团，其中两个或任一个具有11-22个碳原子并且可以含有羟基，羧基或氨基。

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