Optically variable device with diffraction-based micro-optics, method of creating the same, and article employing the same
US9234992B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2013 |
| Grant date | Jan 12, 2016 |
| Priority date | — |
| Expiry date | Aug 14, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/44
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A security device includes an optically variable device (OVD) having diffraction-based micro-optics including at least one moiré magnified visual representation of a micro-object. A diffractive structure provides micro-objects with unique optical effects when the OVD is viewed through the micro-object structure from a predetermined relative observation point. In addition to magnifying the micro-objects, the diffractive structure can impart optical effects such as change in observed color, enhanced contrast, animation of the observed visual representation, and change in size or shape of the observed visual representation. The micro-objects and the diffractive structure can be disposed on the same or different portions of a substrate. A method of making OVDs, and an article employing such OVDs are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.