发明名称 |
Liquid-crystal panel, optical pickup, and information reproducing system |
摘要 |
A liquid-crystal panel is placed in an optical path of an optical beam from a light source to a recording surface of a recording medium for compensating wavefront aberration of the optical beam by giving a phase difference to the optical beam. The liquid-crystal panel comprises a layer of a liquid crystal material having an index of birefringence, wherein the product of the index of birefringence and thickness of the layer of the liquid crystal material is 0.4 mum or more.
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申请公布号 |
US2003133392(A1) |
申请公布日期 |
2003.07.17 |
申请号 |
US20030375071 |
申请日期 |
2003.02.28 |
申请人 |
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发明人 |
IWASAKI MASAYUKI |
分类号 |
G11B7/095;G11B7/125;G11B7/135;(IPC1-7):G11B7/135 |
主分类号 |
G11B7/095 |
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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