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    Multi-layered optical disk
    8.
    发明公开
    Multi-layered optical disk 失效
    多层光盘

    公开(公告)号：EP1515316A2

    公开(公告)日：2005-03-16

    申请号：EP04076975.4

    申请日：1990-10-29

    申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

    发明人： Satoh, Isao ,  Fukushima, Yoshihisa ,  Takagi, Yuji ,  Hamasaka, Hiroshi ,  Azumatani, Yasushi

    IPC分类号： G11B7/085

    CPC分类号： G11B7/24038 ,  G11B7/00736 ,  G11B7/00745 ,  G11B7/08511 ,  G11B7/0908 ,  G11B7/0945 ,  G11B7/24 ,  G11B7/26 ,  G11B2007/0013

    摘要： A method of selectively accessing a desired recording layer on a multi-layered optical disk is described. The multi-layered optical disk comprises a first recording layer (3; 7a) superposed on a first base plate (2), a second recording layer (4; 7c) superposed on a second base plate (2), and a spacer (5) of adhesive disposed between the first recording layer (3; 7a) and the second recording layer (4; 7c). Each recording layer (3, 4; 7a, 7b, 7c) has an identification section (ID a , ID b ). Information is recorded on and/or reproduced from the recording layers (3, 4; 7a, 7b, 7c) by a focused light beam. The method comprises changing the focus of the light beam and detecting zero cross points of respective focusing error signal S curves, each S curve corresponding to a respective recording layer, until the same number of zero cross points as an ordinal number of the desired recording layer is detected. The correct selection of the recording layer (3, 4; 7a, 7b, 7c) is confirmed by reading an identification section (ID a , ID b ) thereof which stores its recording layer address.

    Multi-layered optical disk
    9.
    发明公开
    Multi-layered optical disk 失效

    公开(公告)号：EP1498887A2

    公开(公告)日：2005-01-19

    申请号：EP04076976.2

    申请日：1990-10-29

    申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

    发明人： Satoh, Isao ,  Fukushima, Yoshihisa ,  Takagi, Yuji ,  Hamasaka, Hiroshi ,  Azumatani, Yasushi

    IPC分类号： G11B7/085

    CPC分类号： G11B7/24038 ,  G11B7/00736 ,  G11B7/00745 ,  G11B7/08511 ,  G11B7/0908 ,  G11B7/0945 ,  G11B7/24 ,  G11B7/26 ,  G11B2007/0013

    摘要： A method of selectively accessing a desired recording layer on a multi-layered optical disk is described. The multi-layered optical disk comprises a first recording layer (3; 7a) superposed on a first base plate (2), a second recording layer (4; 7c) superposed on a second base plate (2), and a spacer (5) of adhesive disposed between the first recording layer (3; 7a) and the second recording layer (4; 7c). Each recording layer (3, 4; 7a, 7b, 7c) has an identification section (ID a , ID b ). Information is recorded on and/or reproduced from the recording layers (3, 4; 7a, 7b, 7c) by a focused light beam. The method comprises changing the focus of the light beam and detecting zero cross points of respective focusing error signal S curves, each S curve corresponding to a respective recording layer, until the same number of zero cross points as an ordinal number of the desired recording layer is detected. The correct selection of the recording layer (3, 4; 7a, 7b, 7c) is confirmed by reading an identification section (ID a , ID b ) thereof which stores its recording layer address.