Optical anti-counterfeiting element and manufacturing method therefor
US12304231B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 27, 2020 |
| Grant date | May 20, 2025 |
| Priority date | — |
| Expiry date | Jul 19, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/29
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An optical anti-counterfeiting element and manufacturing methods of the optical anti-counterfeiting element are provided. The optical anti-counterfeiting element includes an undulating structure layer provided with a first area, a second area and a third area; the first area has a first microstructure; the second area has a second microstructure; the third area is an unstructured flat area; a specific volume of the second microstructure is greater than a specific volume of the first microstructure; the first area and the third area are respectively provided with a reflecting layer, a dielectric layer and an absorbing layer which are overlapped, and the second area is not provided with a reflecting layer; and a surface appearance of one side, far away from the undulating structure layer, of the dielectric layer of the first area is obviously different from a surface appearance of the undulating structure layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.