Security device with a zero-order diffractive microstructure
US8270050B2 · kind B2 · utility
2Cited by
13References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2005 |
| Grant date | Sep 18, 2012 |
| Priority date | — |
| Expiry date | May 12, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/22
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A security device comprises a zero order diffractive microstructure buried within a substrate. One or more further optical structures, such as microlenses, may be formed on a surface of the substrate. The further optical structures modify the optical characteristics of the zero order diffractive microstructure such as by enhancing or reducing the color effect produced by the zero-order diffractive microstructure upon tilting the security device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.