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    • 4. 发明申请
    • OPTICAL DISK AND OPTICAL DISK REPRODUCING DEVICE
    • 光盘和光盘再现设备
    • US20080232220A1
    • 2008-09-25
    • US12052854
    • 2008-03-21
    • Masaru YAMAOKA
    • Masaru YAMAOKA
    • G11B7/00
    • G11B7/00736G11B20/00086G11B20/00586G11B20/00666G11B20/00724G11B20/00797G11B20/0084G11B2220/2541G11B2220/2562
    • To provide an optical disk and an optical disk reproducing device capable of preventing sub information from being illegally copied and altered.An optical disk includes an optical disk substrate preliminarily provided with concave/convex recording marks in order to record the main information; and a reflection film which covers the optical disk substrate and of the which reflection coefficient is changed by irradiating laser light at or above a certain intensity, in which the reflection film is preliminarily provided with additional marks for recording the sub information by changing the reflection coefficient of the reflection film on a region where the concave/convex recording marks are formed and the sub information is recorded for every predetermined recording unit for recording the main information and the laser light at or above the certain intensity is irradiated onto the region where the sub information is recorded to thereby reproduce the main information and delete the sub information as well.
    • 提供能够防止副信息被非法复制和改变的光盘和光盘再现装置。 光盘包括预先设置有凹/凸记录标记以便记录主信息的光盘基板; 以及反射膜,其覆盖光盘基板,并且通过照射等于或高于某一强度的激光来改变反射系数,其中反射膜预先设置有用于通过改变反射系数来记录子信息的附加标记 在形成凹凸记录标记的区域上记录反射膜,并且对于每个用于记录主信息的预定记录单元和等于或高于该特定强度的激光记录子信息,照射到子区域 记录信息,从而再现主信息,并删除子信息。