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    • 7. 发明授权
    • Multi-layer optical recording medium and method and apparatus for reproducing optical data
    • 多层光学记录介质以及用于再现光学数据的方法和装置
    • US06700845B1
    • 2004-03-02
    • US09762660
    • 2001-02-09
    • Yoichiro SakoTakao IhashiTatsuya InokuchiHiroshi OgawaMasanobu Yamamoto
    • Yoichiro SakoTakao IhashiTatsuya InokuchiHiroshi OgawaMasanobu Yamamoto
    • G11B390
    • G11B7/005G11B7/24G11B7/24038G11B2007/0006G11B2007/0013
    • An optical disc having a protection layer for protecting a recording layer located farther from a substrate and having a first recording layer and a second recording layer stacked on one side of the substrate, wherein the reflectance of one of the first and second recording layers is made higher than the reflectance of the other recording layer, and a reproducing device which uses this optical disc. The reproducing device casts a light beam emitted from a single light source onto the first recording layer or the second recording layer via a single objective lens, discriminates which of the first recording layer and the second recording layer the light beam emitted from the light source is cast on, on the basis of the result of detection of a reflected beam from the first recording layer or the second recording layer, moves the objective lens in a direction parallel to the optical axis of the objective lens on the basis of the result of discrimination, and condenses the light beam on the first recording layer or the second recording layer so as to carry out reproduction of information.
    • 一种光盘,其具有用于保护位于离基板更远的记录层的保护层,并且具有层叠在基板的一侧的第一记录层和第二记录层,其中制成第一和第二记录层之一的反射率 高于另一记录层的反射率,以及使用该光盘的再现装置。 再现装置通过单个物镜将从单个光源发射的光束投射到第一记录层或第二记录层上,鉴别第一记录层和第二记录层中从光源发出的光束是哪个 基于来自第一记录层或第二记录层的反射光束的检测结果,基于鉴别结果在与物镜的光轴平行的方向上移动物镜 并且将光束聚集在第一记录层或第二记录层上,以便执行信息的再现。