发明名称 |
Optical information recording medium and method of manufacturing |
摘要 |
An optical information recording medium which can be played back by both a playback system for an SD (Superdensity Disk) and a playback system for an HDMCD (High Density Multimedia Compact Disk), or by both the playback system for the SD and a playback system for a CD (Compact Disk). The optical information recording medium comprises a first transparent substrate which includes a smooth surface, and a first information surface bearing pits correspondent to first recorded information, the first information surface being covered with a semitransparent film which transmits part of a playback beam and reflects part thereof; and a second transparent substrate which includes a smooth surface, and a second information surface bearing pits correspondent to second recorded information, the second information surface being covered with a reflective film which reflects the greater part of the playback beam; the second transparent substrate being stacked on the first transparent substrate with the first information surface of the latter overlaid by the smooth surface of the former.
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申请公布号 |
US5828648(A) |
申请公布日期 |
1998.10.27 |
申请号 |
US19970882233 |
申请日期 |
1997.06.25 |
申请人 |
NIPPON COLUMBIA CO., LTD. |
发明人 |
TAKASU, AKIHIKO;KATO, KAZUHO |
分类号 |
G11B7/0037;G11B7/24;G11B7/253;G11B7/26;(IPC1-7):G11B7/24 |
主分类号 |
G11B7/0037 |
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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