Optical anti-counterfeiting element and optical anti-counterfeiting product
US12427802B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 7, 2020 |
| Grant date | Sep 30, 2025 |
| Priority date | — |
| Expiry date | Apr 26, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/0816
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The disclosure provides an optical anti-counterfeiting element (1) and an optical anti-counterfeiting product (0), which belong to the technical field of optical anti-counterfeiting. The optical anti-counterfeiting element includes: a substrate (2) having a first surface (21) and a second surface (22) opposite each other, at least a partial region of the substrate is transparent; and a first transflective coating (31), a dielectric layer (32) and a second transflective coating (33) which are sequentially deposited on the first surface, wherein a ratio of a refractive index to an extinction coefficient of the first transflective coating is different from a ratio of a refractive index to an extinction coefficient of the second transflective coating. When observed from the first surface, the optical anti-counterfeiting element appears in a relatively bright first color; when observed from the second surface, the optical anti-counterfeiting element appears in a relatively bright second color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.