发明名称 |
Optical disc discriminating system |
摘要 |
An optical disc discriminating system comprises: a tracking error signal generating means adapted to generate a tracking error signal whose amplitude level varies with a groove depth of information tracks on an optical disc; a tracking servo means for directing a laser beam along an information track on the optical disc in accordance with the tracking error signal; a comparator adapted to compare the amplitude level of the tracking error signal supplied from the tracking error signal generating means with a reference level, with a tracking servo loop of the tracking servo means in an opened condition; a discriminating means adapted to discriminate the first and second groups of optical discs in accordance with a result from the comparator.
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申请公布号 |
US6144625(A) |
申请公布日期 |
2000.11.07 |
申请号 |
US19980061959 |
申请日期 |
1998.04.17 |
申请人 |
PIONEER ELECTRIC CORPORATION |
发明人 |
KURODA, KAZUO;TANIGUCHI, SHOJI |
分类号 |
G11B7/24;G11B7/00;G11B7/0037;G11B7/004;G11B7/007;G11B7/09;G11B19/12;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/24 |
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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