发明名称 |
Method of identifying optical disc type, and optical disc device |
摘要 |
An unknown optical disc is identified as a CD when an all sum signal value AS-max by a photodetector on a signal surface of the unknown optical disc is larger than an all sum signal value AS-cdref for CD signal surface reference for identifying the CD and the hybrid SACD as a CD based on each CD signal surface thereof, and a focus search driving voltage Y corresponding to the signal surface of the unknown optical disc is lager than a voltage value acquired by a predetermined relational expression between a focus search driving voltage Q corresponding to a DVD signal surface of a reference DVD and a focus search driving voltage R corresponding to a CD signal surface of a reference CD.
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申请公布号 |
US7245564(B2) |
申请公布日期 |
2007.07.17 |
申请号 |
US20040803909 |
申请日期 |
2004.03.19 |
申请人 |
VICTOR COMPANY OF JAPAN, LIMITED |
发明人 |
NAKANO JUN;FUKUDA HIDEO |
分类号 |
G11B7/085;G11B7/00;G11B7/004;G11B7/09;G11B19/12 |
主分类号 |
G11B7/085 |
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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