发明名称 |
Optical information recording medium, optical information recording/reproduction method, and optical information recording/reproduction apparatus |
摘要 |
An optical information recording medium in which the ranges of the refractive index and thickness of a protective layer in a case where the protective layer is constituted by a plurality of layers are newly specified and the refractive index and thickness of the protective layer are determined in these ranges, thereby ensuring that even if variation in thickness of the protective layer to ±3 mum is tolerated, spherical aberration in the optical information recording medium is substantially to within 30 mlambdarms.
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申请公布号 |
US6862740(B2) |
申请公布日期 |
2005.03.01 |
申请号 |
US20040843118 |
申请日期 |
2004.05.11 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
YASUDA AKIHIRO;HAYASHI KAZUHIRO;OGATA DAISUKE |
分类号 |
G11B3/70;G11B5/84;G11B7/00;G11B7/24;G11B7/26;G11B17/04;(IPC1-7):G11B17/04 |
主分类号 |
G11B3/70 |
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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