Optical element and a method of visually authenticating an object
US12001011B2 · kind B2 · utility
0Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2021 |
| Grant date | Jun 4, 2024 |
| Priority date | — |
| Expiry date | Apr 7, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F1/68
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The invention relates to an anti-copy optical element comprising a caustic layer and a mask layer configured to simultaneously display a visible image reproducing a reference image and form a projected image containing a visible caustic pattern reproducing a reference pattern, upon illumination of the optical element with a light source, the projected image being distinct from the reference image. The invention also relates to a method for designing a relief pattern of a light-redirecting surface of said caustic layer consistently with the transmission properties of the mask layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.