发明名称 |
Focus servo control device, and information recording/reproducing device using the same |
摘要 |
A focus servo control device includes a first detector, first controller, second detector, and second controller. The first detector detects a first focus error signal. The first controller controls the objective lens based on the first focus error signal, so that a focal point of the first laser agrees with the guide layer. The second detector detects a second focus error signal. The second controller changes a relative distance between the focal point of the second laser and the focal point of the first laser, so that the focal point of the second laser agrees with a target recording/reproducing layer.
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申请公布号 |
US8553508(B2) |
申请公布日期 |
2013.10.08 |
申请号 |
US201213421503 |
申请日期 |
2012.03.15 |
申请人 |
USUI TAKASHI;WATABE KAZUO;OKANO HIDEAKI;TANIOKA CHIKARA;OGAWA AKIHITO;DOI KAZUAKI;KABUSHIKI KAISHA TOSHIBA |
发明人 |
USUI TAKASHI;WATABE KAZUO;OKANO HIDEAKI;TANIOKA CHIKARA;OGAWA AKIHITO;DOI KAZUAKI |
分类号 |
G11B7/00;G11B5/55;G11B5/58 |
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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