Security marking authentication device
First Claim
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1. 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;
ora 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.
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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.
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9 Claims
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1. A visual authentication device for the visual authentication of a document or item having a circular polarizing security marking, said device comprising:
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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;
ora 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification