发明名称 |
SPEZIALOBERFLÄCHE |
摘要 |
A multilayer surface comprising at least two layers, said layers having different refractive indexes such that selective wavelengths/colours are transmitted and or reflected. The layers are preferably laid onto a transparent substrate. The surface can be used as an anti-counterfeit device. A method of determining whether an article is counterfeit comprising: providing such a surface; determining its transmission/absorption characteristics of particular colour(s); matching these up with the expected characteristics to determine whether the surface is counterfeit. This may comprise observing the reflected or transmitted colour at two different angles of incidence or detecting changes in the polarisation state of transmitted light. |
申请公布号 |
DE60005508(D1) |
申请公布日期 |
2003.10.30 |
申请号 |
DE2000605508 |
申请日期 |
2000.05.19 |
申请人 |
QINETIQ LTD., LONDON |
发明人 |
LAWRENCE, CHRISTOPHER ROBERT;VUKUSIC, PETER;SAMBLES, JOHN ROY |
分类号 |
B42D15/10;G01N21/21;G01N21/27;G01N21/84;G02B5/12;G02B5/18;G02B5/28;G02B5/30;G07D7/06;G07D7/12 |
主分类号 |
B42D15/10 |
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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