发明名称 |
DUAL STACK OPTICAL DATA STORAGE MEDIUM |
摘要 |
A dual stack optical data storage medium ( 30 ) for recording and reading by means of a focused radiation beam ( 29 ) is described. The beam enters the medium ( 30 ) through a first radiation beam entrance face ( 21 ). The medium has at least a first substrate ( 1 a) with on at least one side of the first substrate ( 1 a) a first layer stack ( 2 ), comprising a first information layer ( 3 ), a second layer stack ( 5 ), comprising a second information layer ( 6 ) and a first transparent spacer layer ( 4 ) between the first layer stack ( 2 ) and the second layer stack The first layer stack ( 2 ) is present at a position closer to the first radiation beam entrance face ( 21 ) than the second layer stack ( 5 ). The first information layer ( 3 ) is one selected from the group of types consisting of a read only layer and a write once layer, and 10 the second information layer ( 6 ) is one selected from the group of types consisting of a read only layer, a write once layer and a rewritable layer. The type of the first information layer ( 3 ) is different from the type of the second information layer ( 6 ). Compatibility of the medium with read only standards is achieved while the advantages of writability and erasability are maintained. Double sided versions of the medium are also described having a 15 third and fourth layer stack ( 7, 10 ). |
申请公布号 |
AU2003216587(A1) |
申请公布日期 |
2003.10.13 |
申请号 |
AU20030216587 |
申请日期 |
2003.04.01 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
RONALD, J., A. VAN DEN OETELAAR;HUBERT, C., F. MARTENS |
分类号 |
G11B7/00;G11B7/004;G11B7/007;G11B7/24038 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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