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公开(公告)号:US20180272789A1
公开(公告)日:2018-09-27
申请号:US15571302
申请日:2016-05-23
申请人: ROLIC AG
发明人: Reto GENINI , Julien MARTZ , Etienne BERNER , Benoit SCHILL
IPC分类号: B42D25/364 , G02B5/30 , B42D25/41
CPC分类号: B42D25/364 , B42D25/391 , B42D25/41 , G02B5/3016 , G02B5/305
摘要: The invention relates to an optical security device with multiple hidden images which become visible by arranging a polarizer above or below the device. Additional images become visible upon rotation of the polarizer. The optical device comprises two patterned optical retarders and a polarizer between the retarders.
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公开(公告)号:US20180106932A1
公开(公告)日:2018-04-19
申请号:US15566369
申请日:2016-04-11
申请人: ROLIC AG
发明人: Benoit SCHILL , Etienne BERNER , Reto GENINI , Julien MARTZ
IPC分类号: G02B5/02 , B42D25/324
CPC分类号: G02B5/0257 , B42D25/24 , B42D25/29 , B42D25/324 , B42D25/328 , B42D25/425 , B42D25/435 , G02B5/0221 , G02B5/0263 , G02B5/0284
摘要: The present invention relates to an optical element wherein a first and a second image is at least partially encoded by a pattern of a non-periodic, anisotropic surface relief microstructure such that when light is incident on the surface of the element the first image is optimally visible under a first viewing angle and the second image is optimally visible under a second viewing angle. The elements according to the invention are particularly useful for securing documents and articles against counterfeiting and falsification.
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