OPTICAL SECURITY COMPONENT, PRODUCTION OF SUCH A COMPONENT AND SECURE PRODUCT PROVIDED WITH SUCH A COMPONENT
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United States of America Patent
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Issued Date -
Aug 28, 2014
app pub date -
Aug 14, 2012
filing date -
Aug 24, 2011
priority date (Note) -
Abandoned
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Abstract
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.
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