Optical security elements, marked object, method of authenticating an object and use of optical security elements for authenticating or securing against counterfeiting
US11987066B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2019 |
| Grant date | May 21, 2024 |
| Priority date | — |
| Expiry date | Mar 5, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D2207/00
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An optical security element made of a refractive transparent or partially transparent optical material and comprising an optical assembly of a caustic layer having a light-redirecting surface with a relief pattern of given depth and a focal length fC and an adjacent lens element of focal length fL configured to redirect incident light received from a point-like light source through it and to form a projected image containing a caustic pattern directly on a retina of an observer. A marked object, as well as a method of visually authenticating an object, and use of optical security elements for authenticating or securing against counterfeiting are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.