发明名称 |
Optical pickup for detecting thickness variation of a recording medium, and/or compensating for spherical aberration caused by thickness variation of a recording medium |
摘要 |
An optical pickup for a recording medium includes a light beam division and detection unit including receiving portions dividing an incident light beam reflected on the recording medium into a first light beam portion and a second light beam portion around the first light beam portion and converting the first and second light beam portions into first and second detection signals, respectively. A thickness variation detection circuit detects a variation in thickness of the recording medium according to the first and second detection signals and outputs a thickness variation signal indicative thereof.
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申请公布号 |
US7035186(B2) |
申请公布日期 |
2006.04.25 |
申请号 |
US20010985767 |
申请日期 |
2001.11.06 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
CHUNG CHONG-SAM;AHN YOUNG-MAN;KIM TAE-KYUNG;SUH HAE-JUNG |
分类号 |
G11B5/58;G11B7/09;G11B7/125;G11B7/13;G11B7/135 |
主分类号 |
G11B5/58 |
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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