发明名称 |
Method and apparatus for recording/reproducing information on/from a recording optical disc |
摘要 |
<p>The invention concerns methods for recording and/or reproducing information on/from a recording layer (33) of an optical disc by using an optical disc having said recording layer (33) behind a substrate (30,31) of 0.6 mm thickness. An important step of such methods is focusing a laser light on said recording layer (33) by use of a focusing lens (18) of a numerical aperture (NA) in the range of >0.53 to ≤0.65. The invention includes as well a related apparatus for recording and/or reproducing information on a recording and/or reproducing layer (33) of an optical disc having said recording layer (33) behind a substrate (30,31) of 0.6 mm thickness, incorporating focusing means (18) for focusing said laser light on said recording layer (33) by a focusing lens (18) of a numerical aperture (NA) in the range of >0.53 to ≤0.65 to record information to said recording layer (33).</p> |
申请公布号 |
EP0862166(A1) |
申请公布日期 |
1998.09.02 |
申请号 |
EP19980104596 |
申请日期 |
1991.04.19 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
SATOH, ISAO;MIZUNO, SADAO;ITOH, NOBORU |
分类号 |
G11B7/00;G11B7/0045;G11B7/005;G11B7/09;G11B7/135;G11B7/24;G11B7/243;G11B19/12;(IPC1-7):G11B7/00 |
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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