Sheet-material authenticated item with reflective-...

Details Sheet-material authenticated item with reflective-... Sheet-material authenticated item with reflective-...

G - Physics

06

K

352/53.72

G06K 9/18 (2006.01) B42D 15/10 (2006.01) G02B 5/18 (2006.01) G06K 19/16 (2006.01) G07D 7/12 (2006.01)

Patent

CA 1185370

SHEET-MATERIAL AUTHENTICATED ITEM WITH DIFFRACTIVE-SUBTRACTIVE AUTHENTICATING DEVICE Abstract An improved authenticating device comprises a substrate bonded to the sheet material, the substrate having a reflective diffractive structure formed as a relief pattern on a viewable surface thereof, and a transparent material covering the structure. Specified grating parameters of the diffractive structure, obtainable at low cost, result in peculiar, but easily discernable, optical color properties that cannot be copied by color copying machines.

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