发明名称 |
ANTI-CHIPPING RECORDING DISC, READING METHOD AND RECORDING HEAD |
摘要 |
Information recording disk comprising a main recording track comprising one or more interruptions and/or changes of turn, this giving rise to non-sequential reading and therefore to information which is difficult to access. The copying of such a disk by conventional means becomes very difficult, and this will make it possible on the one hand to detect counterfeits by detecting the information and on the other hand to render any copy unusable.
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申请公布号 |
US2002136124(A1) |
申请公布日期 |
2002.09.26 |
申请号 |
US19990308255 |
申请日期 |
1999.05.25 |
申请人 |
PIROT FRANCOIS-XAVIER;LEHUREAU JEAN-CLAUDE |
发明人 |
PIROT FRANCOIS-XAVIER;LEHUREAU JEAN-CLAUDE |
分类号 |
G11B7/007;G11B20/00;G11B23/28;(IPC1-7):G11B7/24 |
主分类号 |
G11B7/007 |
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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