Optical security component with reflective effect, production of such a component and secure document provided with such a component
US10343443B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2018 |
| Grant date | Jul 9, 2019 |
| Priority date | — |
| Expiry date | May 1, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/1809
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
According to one aspect, the invention relates to an optical security component intended for being observed under direct reflection. The component comprises a structure engraved on a layer of a material having a refraction index n2, a thin layer of a dielectric material having a refraction index n1 other than n2, deposited on the structure, and a layer of a material having a refraction index no other than n1, encapsulating the coated structure of the thin layer. The structure has a first pattern modulated by a second pattern such that, in at least one first region (61, 86), the first pattern comprises a low-relief with a first set of facets, the shapes of which are determined such as to generate at least one first concave or convex cylindrical reflective element, and the second pattern forms a first subwavelength grating acting, after depositing the thin layer and encapsulating the structure, as a first wavelength-subtractive filter; in at least one second region (62, 86), the first pattern comprises a low-relief with a second set of facets in which the shapes are determined such as to generate at least one concave or convex cylindrical reflective element (64), and the second patte…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.