发明名称 |
Method for adjusting focus or tracking detection unit, and optical disc device |
摘要 |
An optical disc device comprises a spherical or coma aberration correction unit to pre-correct spherical or coma aberration occurring in the light beam, a focus or tracking detection unit operable to detect a focus or tracking error signal, and an FE or TE amplitude adjustment unit operable to adjust the signal amplitude of the focus or tracking detection unit to a specific value after the amount of spherical or coma aberration has been matched to a specific value by the spherical or coma aberration correction unit.
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申请公布号 |
US7522485(B2) |
申请公布日期 |
2009.04.21 |
申请号 |
US20050110833 |
申请日期 |
2005.04.21 |
申请人 |
PANASONIC CORPORATION |
发明人 |
MARUYAMA TOORU;WATANABE KATSUYA |
分类号 |
G11B7/00;G11B7/085;G11B7/09;G11B7/135 |
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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