发明授权
- 专利标题: Optical identification element
- 专利标题(中): 光学识别元件
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申请号: US09647717申请日: 2000-10-04
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公开(公告)号: US06496287B1公开(公告)日: 2002-12-17
- 发明人: Hubert Seiberle , Franco Moia , Martin Schadt
- 申请人: Hubert Seiberle , Franco Moia , Martin Schadt
- 优先权: CH841/98 19980709
- 主分类号: G02B532
- IPC分类号: G02B532
摘要:
An optical component in the form of an identification element (such as for counterfeit protection or copy protection) includes an optically anisotropic layer comprising regions of different optical axes that is arranged over a reflector. The anisotropic layer may be implemented with a liquid crystal polymer in which the orientation of the liquid crystals is different in different areas. Such an orientation pattern is initially hidden from a viewer, but becomes visible by means of an additional polariser. To improve the visual appearance of the identification element, a white light hologram may be used for the reflector.
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