Patent ID: 9134468
Filing Date: 2015-09-15
Classification: B42D,G02B

Abstract:
1. An optical authentication component visible in reflection, comprising: at least one structure imprinted on a substrate of refractive index n a thin layer having a thickness between 50 and 150 nanometers, made of a dielectric material having a refractive index n a layer, made of a material having a refractive index n wherein the at least one structure comprises a first pattern and a second pattern that modulates the first pattern: the first pattern being a bas-relief comprising an array of facets the shapes of which are defined in order to simulate an image in relief of an object in relief; the second pattern being a periodic grating that modulates the first pattern in order to produce, after the thin layer has been deposited and said at least one structure has been encapsulated, a first color at a first viewing angle and a different second color at a second viewing angle obtained by azimuthal rotation of the optical authentication component.