发明名称 |
Optical pickup and optical disc unit |
摘要 |
For use with a multi-layer optical disc, an optical pickup can eliminate a problem of causing a focus error signal and a tracking error signal to fluctuate due to interference of a signal light beam with a return light beam from another recording surface of a multi-layer optical disc during reproduction with an optical pickup that produces a tracking error signal and a focus error signal from a difference signal based on polarized reflected light. |
申请公布号 |
US8331207(B2) |
申请公布日期 |
2012.12.11 |
申请号 |
US20080074968 |
申请日期 |
2008.03.07 |
申请人 |
IZUMI KATSUHIKO;YAMAZAKI KAZUYOSHI;KAWAMURA TOMOTO;OHNISHI KUNIKAZU;HITACHI MEDIA ELECTRONICS CO., LTD. |
发明人 |
IZUMI KATSUHIKO;YAMAZAKI KAZUYOSHI;KAWAMURA TOMOTO;OHNISHI KUNIKAZU |
分类号 |
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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