| 发明名称 | Security element and method for its production | ||
| 摘要 | The present invention relates to a security element (20) for security papers, value documents and the like having a diffraction pattern that exhibits an embossed relief pattern (24, 26) and a coating layer (28, 32) that increases the visibility of the diffraction effect of the embossed relief pattern (24, 26). According to the present invention, the relief pattern (24, 26) is formed on the basis of a cholesteric liquid crystalline material (24) and the coating layer (28, 32) includes a reflective (28) and/or a high-index layer (32). | ||
| 申请公布号 | US8968856(B2) | 申请公布日期 | 2015.03.03 |
| 申请号 | US200712294222 | 申请日期 | 2007.03.19 |
| 申请人 | Giesecke & Devrient GmbH | 发明人 | Hoffmüller Winfried;Burchard Theodor |
| 分类号 | B42D15/00;B42D15/10;B32B9/00;B32B19/00;B32B5/06;B42D25/29;B42D25/328 | 主分类号 | B42D15/00 |
| 代理机构 | Lathrop & Gage LLP | 代理人 | Lathrop & Gage LLP |
| 主权项 | 1. A security element for security papers, value documents and the like having a diffraction pattern comprising a cholesteric liquid crystalline material layer having an embossed relief pattern and a coating layer that increases the visibility of the diffraction effect of the embossed relief pattern, the coating layer including (a) a reflective layer,(b) a vapor deposited high-refractive-index (HRI) layer, or(c) both the reflective layer and the vapor deposited high-refractive-index layer; wherein when the coating layer includes only (a) the reflective layer, the reflective layer being present in at least some areas and exhibiting gaps in the form of patterns, characters, or codes. | ||
| 地址 | Munich DE | ||