LIQUID CRYSTAL COLOR-SHIFTING SECURITY DEVICE |
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| 申请号 | US15720487 | 申请日 | 2017-09-29 | 公开(公告)号 | US20180093519A1 | 公开(公告)日 | 2018-04-05 |
| 申请人 | Crane & Co., Inc.; | 发明人 | Pearl N. Dickerson; Nancy J. Gettens; David L. Peters; | ||||
| 摘要 | Presented herein are layered systems, security devices formed from the layered systems and methods of manufacturing those layered systems and security devices. The security devices provide several effects including, but not limited to, (1) color-shifting effects that are observable as the points of view of the observant changes and (2) customizable micro-text formed in the security device by demetallization of a metallic layer provided on or within the security device. The method of manufacturing the security devices includes manufacturing a layered system that is used to form the security devices. As will be described in further detail herein, the method of manufacturing the layered system includes providing a substrate layer having a metallic layer, masking at least parts of that metallic layer with an opaque material to form masked metal areas and exposed metal areas, removing metal from the exposed metal areas to form de-met areas, covering the masked areas and the de-met areas with a liquid crystal material. The layered system that results from the method which includes these steps provides a color-shifting effect from the liquid crystal material and a micro-text effect from the contrast between the de-met areas and the masked metal areas. Security devices formed from the layered system can take various shapes, sizes and colors. Such security devices suitable for various applications including, but not limited to, uses for authenticating consumer products, security documents, identification documents, and various other high value or high security products. Alternatively, such security devices are also suitable for providing aesthetic properties. The resulting security devices comprise the layered system which comprises a substrate layer with a metallic layer having masked metal areas and de-met areas, and a liquid crystal layer. | ||||||
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