Magneto-optical recording medium
    21.
    发明授权
    Magneto-optical recording medium 失效
    磁光记录介质

    公开(公告)号:US06198704B1

    公开(公告)日:2001-03-06

    申请号:US09496654

    申请日:2000-02-03

    IPC分类号: G11B1100

    CPC分类号: G11B11/10593 G11B11/10515

    摘要: A magneto-optical recording medium from which data is read by using a Kerr effect and which is capable of preventing signal imbalance caused from change in birefringence even in a system in which the amplitude of a reproduced signal is small and the spatial frequency of a shortest record signal train of the magneto-optical recording medium is 1.1×NA/&lgr;(line/m) or higher. The photoelastic coefficient of a substrate of the magneto-optical recording medium is 50×10−13 cm2/dyne or smaller. The vertical birefringence of the substrate is 250×10−6 or smaller, the coefficient of water absorption of the same is 0.2 wt % or lower and the thermal coefficient of expansion of the same is 6.5×10−5 cm/cm·° C. or lower.

    摘要翻译: 一种磁光记录介质,通过使用克尔效应从中读取数据,并且即使在再现信号的幅度小,空间频率最短的系统中也能够防止由双折射变化引起的信号失衡 磁光记录介质的记录信号序列为1.1xNA / lambd(行/ m)以上。 磁光记录介质的基板的光弹性系数为50×10 13 cm 2 / dyne以下。 基板的垂直双折射率为250×10 -6以下,其吸水系数为0.2重量%以下,其热膨胀系数为6.5×10 -5 cm / cm。℃以下 。