Optical security components, manufacture of such components and secure documents equipped with such components
US12246553B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 2022 |
| Grant date | Mar 11, 2025 |
| Priority date | — |
| Expiry date | Jul 11, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/373
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An optical security component may include a first layer, a diffractive structure etched on the first layer, a second reflective layer covering the diffractive structure. The diffractive structure includes a first pattern consisting of a set of facets arranged to form various subsets of facets, each subset of facets including a facet with symmetry of revolution arranged concentrically. In each group of the subsets of facets, the subsets of facets present, in point regions defined by identical polar coordinates, a local alteration of the surface, such as to produce a recognizable graphic object for a given tilt angle and azimuth angle. The polar coordinates vary from one group to another, so as to produce a dynamic visual effect observable in reflection by change of tilt and/or azimuth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.