发明名称 |
DIFFRACTIVE SAFETY ELEMENT |
摘要 |
<p>A security element ( 2 ) comprising a plastic laminate ( 1 ) has a surface pattern which is composed mosaic-like at least from surface elements, wherein in the surface elements a reflecting interface ( 8 ) between a shaping layer ( 5 ) and a protective layer ( 6 ) of the plastic laminate ( 1 ) forms optically effective structures ( 9 ). Light ( 11 ) which is incident on the plastic laminate ( 1 ) and which passes through a cover layer ( 4 ) of the plastic laminate ( 1 ) and through the shaping layer ( 5 ) is deflected in a predetermined manner by means of the optically effective structures ( 9 ). Shaped in the surface of at least one of the surface elements is a diffraction structure which is produced by a superimposition of a linear asymmetrical diffraction grating ( 24 ) with a matt structure. The linear asymmetrical diffraction grating ( 24 ) has a spatial frequency from the range of values of between 50 lines/mm and 2,000 lines/mm. The matt structure has a mean roughness value from the range of between 20 nm and 2,000 nm and at least in one direction a correlation length of between 200 nm and 50,000 nm.</p> |
申请公布号 |
EP1458578(B1) |
申请公布日期 |
2009.04.08 |
申请号 |
EP20020805743 |
申请日期 |
2002.11.02 |
申请人 |
OVD KINEGRAM AG |
发明人 |
SCHILLING, ANDREAS;TOMPKIN, WAYNE, ROBERT;STAUB, RENE |
分类号 |
B42D25/328;B42D15/00;B42D25/29;D21H21/42;G03H1/18 |
主分类号 |
B42D25/328 |
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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