发明名称 |
Optical disc apparatus and defocus correcting method |
摘要 |
An optical disc apparatus in which a bias of a focusing error signal is changed to a value according to a recording power at timing corresponding to a predetermined address position before starting the recording and a defocus of an opposite polarity is preliminarily caused so as to set off a defocus which occurs at the start of the recording. The defocus is calculated, rather than by executing a learning process.
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申请公布号 |
EP2330589(A1) |
申请公布日期 |
2011.06.08 |
申请号 |
EP20100161076 |
申请日期 |
2010.04.26 |
申请人 |
HITACHI CONSUMER ELECTRONICS CO., LTD. |
发明人 |
ISHIKAWA, YOSHINORI;JIN, GOHSHI |
分类号 |
G11B7/09 |
主分类号 |
G11B7/09 |
代理机构 |
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代理人 |
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地址 |
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