Optical security element
US7265904B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2004 |
| Grant date | Sep 4, 2007 |
| Priority date | — |
| Expiry date | Jun 16, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H1/0011
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The invention concerns an optical security element having a substrate layer, in which a first microstructure for producing a first optically perceptible effect is shaped region-wise in a surface region. The surface region is divided into microscopically fine pattern regions and a background region. The first microstructure is shaped in the pattern regions but not in the background region. The microscopically fine pattern regions in the surface region are arranged in the form of a moire pattern into which a concealed item of information which can be evaluated by means of an associated verification element is encoded as a security feature. The microscopically fine pattern regions are further substructured in accordance with a substructuring function which describes a microscopic substructuring, serving as a further security feature, of the moire pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.