OPTICAL DISK AND RECORDING/REPRODUCING APPARATUS

    公开(公告)号:US20070111142A1

    公开(公告)日:2007-05-17

    申请号:US11556997

    申请日:2006-11-06

    CPC classification number: G11B7/24056

    Abstract: A method for forming an optical disk including, providing a substrate and an information recording layer on the substrate, and covering the information recording layer with a cover layer having light transmission properties such that a thickness t of the cover layer is determined based on a predetermined function f(n), which depends on a refractive index n of the cover layer, and the function f(n) is, f ⁡ ( n ) = A 1 × n 3 ( n 2 - 1 ) × ( n 2 + A 2 ) ( n 2 + A 3 ) ⁢   ⁢ ( mm ) ,  in which, A1=0.049245, A2=−0.579135, and A3=0.012842, and constants t1 and t2 determine a range of the thickness t of the cover layer so that f(n)−t1

    Optical pickup unit and information recording/reproduction apparatus
    88.
    发明申请
    Optical pickup unit and information recording/reproduction apparatus 失效
    光学拾取单元和信息记录/再现装置

    公开(公告)号:US20060187778A1

    公开(公告)日:2006-08-24

    申请号:US11344956

    申请日:2006-01-31

    CPC classification number: G11B7/1353 G11B7/131 G11B2007/0006

    Abstract: According to one embodiment, an optical pickup unit which can record, reproduction and erase information in/from an information recording medium has tracks with different pitches, the dividing means has at least a part of a dividing boundary line placing between an end of a 1st order diffraction light with the largest diffraction angle and an end of a 1st order diffraction light with the smallest diffraction angle of the reflected laser beam.

    Abstract translation: 根据一个实施例,可以在信息记录介质中记录,再现和擦除信息的光学拾取单元具有不同间距的轨道,该分割装置具有至少一部分分割边界线,其位于第一 具有最大衍射角的次级衍射光和具有反射激光束的最小衍射角的1级衍射光的末端。

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