发明名称 |
Optical disc |
摘要 |
An optical disc used with an optical head with a focus depth of about 2 micron meter minimizes defects and deterioration in the optical disc at the time of manufacture, during operation and storage thereof as well. The optical disc includes a pair of transparent substrates each provided with at least one layer enabling recording of information, with the pair being bonded and laminated together has an instantaneous axial acceleration<2G.
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申请公布号 |
US6573025(B2) |
申请公布日期 |
2003.06.03 |
申请号 |
US20020158894 |
申请日期 |
2002.06.03 |
申请人 |
HITACHI, LTD.;HITACHI MAXELL LTD. |
发明人 |
MIWA HIROAKI;SUDO RYOICHI;TAJIMA TETSUO;KOYAMA EIJI |
分类号 |
G11B7/0037;G11B7/24;G11B7/243;G11B7/257;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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