OPTICAL SECURITY COMPONENT, PRODUCTION OF SUCH A COMPONENT AND SECURE PRODUCT PROVIDED WITH SUCH A COMPONENT

摘要

One aspect of the invention relates to an optical security component (10) comprising at least one diffractive element (7) formed by at least one annular diffractive grating (111, 113, 115, 117, 131, 133, 135) characterized by a minimum radius (Rmin), a maximum radius (Rmax) and a period (d). According to the invention, using a polychromatic light-emitting object, the aforementioned diffractive element can form a plurality of images at different observation distances from the component, the spectral characteristics of said images varying as a function of the observation distance from the component.

主权项

1. A secure product comprising:
an optical security component wherein the optical security component comprises at least one diffractive element formed of a combination of several diffractive annular gratings, arranged around an axis of revolution, each of said several diffractive annular gratings having a minimum radius (Rmin), a maximum radius (Rmax) and a period (d), said diffractive element being able to form on the basis of a polychromatic luminous object a plurality of images at various distances of observation of the component, the spectral characteristics of said images being variable as a function of the distance of observation of the component.