Optical security device with full parallax diffraction optical variable image
US10493788B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2015 |
| Grant date | Dec 3, 2019 |
| Priority date | — |
| Expiry date | Feb 13, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/45
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention discloses an optical security device with full parallax diffraction optical variable image, the optical security device comprises: a base layer; and an optical assembly at least partially covering a surface of the base layer; wherein the optical assembly has a micro relief structure, so that when a beam of white light illuminates on the optical assembly, the optical assembly presents a full parallax image under the action of the micro relief structure. The present invention obtains the micro relief structure through combining the phase plate, and achieves the reconstruction of the full parallax diffraction optical variable image under the condition of white light illumination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.