发明名称 |
PHOTONIC CRYSTAL SECURITY DEVICE |
摘要 |
An optically variable security device comprises a photonic crystal fo which incident light received by the crystal is selectively reflected o transmitted by the crystal to generate a first optically variable effec observable over a first set of directions. Incident light received by the crystal is also selectively reflected or transmitted by the crystal to generate an optical effect observable over a second set of directions that is different from the first set. |
申请公布号 |
WO2008017869(A1) |
申请公布日期 |
2008.02.14 |
申请号 |
WO2007GB03064 |
申请日期 |
2007.08.10 |
申请人 |
DE LA RUE INTERNATIONAL LIMITED;WHITEMAN, ROBERT |
发明人 |
WHITEMAN, ROBERT |
分类号 |
B42D15/10;B42D15/00 |
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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