发明名称 |
VERIFICATION OF DOCUMENTS OF VALUE HAVING A WINDOW DISPLAYING DIFFRACTIVE STRUCTURES |
摘要 |
An apparatus and method for verifying value documents involves a substrate having at least one light-transmissive region with a first information item. A separate display comprises a gridded arrangement of pixels and a second information item is displayed through the separate display at least regionally to correlate with the first information item. A further information item not recognizable and/or readable to a viewer without auxiliary means is hidden in the first and/or second information item. The substrate is placed with its first information item over the second information item which is displayed on the separate display, and the hidden information item becomes recognizable and/or readable. The first information item is formed by light-transmissive diffractive structures whose surface is furnished with an at least partly reflective coating formed from elements arranged in a gridded manner. |
申请公布号 |
EP2856439(A1) |
申请公布日期 |
2015.04.08 |
申请号 |
EP20130727048 |
申请日期 |
2013.05.27 |
申请人 |
GIESECKE & DEVRIENT GMBH |
发明人 |
SCHIFFMANN, PETER;FUHSE, CHRISITAN |
分类号 |
G07D7/20 |
主分类号 |
G07D7/20 |
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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