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US 8,985,463 B2Granted
Security marking authentication device
AssigneeSicpa Holding SA
InventorsEric Decoux, Andrea Callegari
Life of this patent
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Abstract
The invention discloses an authentication device for the visual authentication of a document or item comprising a circular polarizing security marking, said device comprising a light source and polarization filters for the either parallel or alternate illumination of said marking on said document with left- and right-circular polarized light. Corresponding methods for the visual and the automated authentication of the marking are disclosed as well.
Claims9
A visual authentication device for the visual authentication of a document or item having a circular polarizing security marking, said device comprising:
- at least one light source and at least one circular polarizing filter structured and arranged to emit left- and right-circular polarized light onto the document for the illumination of the said marking, wherein either:
- two beams of light of opposite circular polarizations are produced to simultaneously illuminate said marking;
- or
- a single beam of light of alternating opposite circular polarization is produced to illuminate said marking,
- which thereby allows a user to visually observe with the naked eye the appearance/change of appearance of the marking under illumination by each type of polarized light.
2 more elements
Dependencies are inferred from the claim text.