Surys

Hologram Industries

Vincent Tollet

Valéry Petiton

Valery Petiton

Hugues Souparis

Françoise Daniel

Khalil Chikha

Francoise Daniel

Yoran Eli Pigeon

According to a first aspect, the invention relates to an optical security component intended to be observed in reflection, with the naked eye, according to face of observation. It comprises a first layer made of dielectric material, having a first refractive index (n), at least one first diffractive structure (S, S) etched on said first layer. The first diffractive structure comprises a first pattern with at least one set of modules disposed side-by-side, in a given direction (X) of arrangement, a maximum width (l) of each module defined in the direction of arrangement (X) being less than 300 &#x3bc;m. Each module comprises a bas-relief with a first set of facets whose forms are determined to simulate an optical element visible in reflection, with at least one convex or concave region, said optical element having a profile with a continuously variable slope in a single direction (Y), said direction of variation of the slope, at right angles to the direction of arrangement (X). For two modules side-by-side, the slope along at least one line parallel to the direction (X) of arrangement is different between said two modules.

Optical security component visible in reflection, manufacture of such a component, and secure document provided with such a component

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 n, a thin layer of a dielectric material having a refraction index nother than n, deposited on the structure, and a layer of a material having a refraction index no other than n, 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 (), 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 (), 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 (), and the second pattern forms a second subwavelength grating acting, after depositing the thin layer and encapsulating the structure, as a second wavelength-subtractive filter, separate from the first wave-length-subtractive filter. Each subwavelength grating can be a zero order diffraction grating such as a DID.

Optical security component with reflective effect, production of such a component and secure document provided with such a component

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 n, a thin layer of a dielectric material having a refraction index nother than n, deposited on the structure, and a layer of a material having a refraction index nother than n, 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 (), 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 (), 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 (), and the second pattern forms a second subwavelength grating acting, after depositing the thin layer and encapsulating the structure, as a second wavelength-subtractive filter, separate from the first wave-length-subtractive filter. Each subwavelength grating can be a zero order diffraction grating such as a DID.

An optical security component intended to be checked in reflection in a checking spectral band includes a layer that is reflective in the checking spectral band. The layer exhibits a structured zone that includes microstructures distributed spatially in a uniform manner over a whole of the structured zone so as to form an optical structure that is at least partially scattering in the checking spectral band. The microstructures have heights that are distributed according to a random function, modulated over the structured zone by a modulation function so as to form, after illumination of the optical security component at a given angle, an image identifiable by observation in reflection.

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Bouleurs, France

Vincent Tollet