- 专利标题： MULTIPLE HIDDEN IMAGE SECURITY DEVICE
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申请号： US15571302申请日： 2016-05-23
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公开(公告)号： US20180272789A1公开(公告)日： 2018-09-27
- 发明人: Reto GENINI , Julien MARTZ , Etienne BERNER , Benoit SCHILL
- 申请人： ROLIC AG
- 申请人地址： CH Zug
- 专利权人： ROLIC AG
- 当前专利权人： ROLIC AG
- 当前专利权人地址： CH Zug
- 优先权： EP15169102.9 20150526
- 国际申请： PCT/EP2016/061518 WO 20160523
- 主分类号： B42D25/364
- IPC分类号： B42D25/364 ; G02B5/30 ; B42D25/41
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.
公开/授权文献
- US10889141B2 Multiple hidden image security device 公开/授权日：2021-01-12