Invention Grant
- Patent Title: Multilayer optical disc for easy positioning of a focused beam
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Application No.: US13207146Application Date: 2011-08-10
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Publication No.: US08483030B2Publication Date: 2013-07-09
- Inventor: Yoshinori Ishikawa , Harukazu Miyamoto , Akemi Hirotsune
- Applicant: Yoshinori Ishikawa , Harukazu Miyamoto , Akemi Hirotsune
- Applicant Address: JP Tokyo
- Assignee: Hitachi Consumer Electronics Co., Ltd.
- Current Assignee: Hitachi Consumer Electronics Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: McDermott Will & Emery LLP
- Priority: JP2007-146435 20070601
- Main IPC: G11B7/24
- IPC: G11B7/24 ; G11B7/09

Abstract:
A multilayer optical disc which has three or more recording layers and enables easy positioning of a focused beam spot onto a particular recording layer in which a BCA is disposed. An inter-layer distance between a particular recording layer and a recording layer adjacent to the particular recording layer is larger than the other inter-layer distances in which, at the focused beam spot positioning, the focused beam spot traverses the said adjacent recording layer earlier than the other recording layer adjacent to the particular recording layer.
Public/Granted literature
- US08514684B2 Multilayer optical disc for easy positioning of a focused beam Public/Granted day:2013-08-20
Information query
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