Invention Grant
- Patent Title: MULTILAYER OPTICAL DISC
- Patent Title (中): 多层光盘
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Application No.: EP08721721.2Application Date: 2008-03-10
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Publication No.: EP2154683B1Publication Date: 2012-06-20
- Inventor: ISHIKAWA, Yoshinori , MIYAMOTO, Harukazu , HIROTSUNE, Akemi
- Applicant: Hitachi Consumer Electronics Co. Ltd.
- Applicant Address: 2-1, Otemachi 2-chome Chiyoda-ku Tokyo 100-0004 JP
- Assignee: Hitachi Consumer Electronics Co. Ltd.
- Current Assignee: Hitachi Consumer Electronics Co. Ltd.
- Current Assignee Address: 2-1, Otemachi 2-chome Chiyoda-ku Tokyo 100-0004 JP
- Agency: Kirschner, Klaus Dieter
- Priority: JP2007146435 20070601
- International Announcement: WO2008146516 20081204
- Main IPC: G11B7/24
- IPC: G11B7/24 ; G11B7/085
Abstract:
A multilayer optical disc which has three or more recording layers and enables easy positioning of a beam spot on a desired recording layer wherein BCA is disposed. A distance between the desired recording layer and either of recording layers adjacent to the desired recording layer over which a laser spot passes earlier than the desired recording layer when positioning a beam spot on the desired recording layer is set larger than a distance between the desired recording layer and the other adjacent recording layer.
Public/Granted literature
- EP2154683A1 MULTILAYER OPTICAL DISC Public/Granted day:2010-02-17
Information query
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