G - Physics
06
K
G06K 19/08 (2006.01) G03H 1/28 (2006.01) G06K 19/16 (2006.01)
Patent
CA 2090436
2090436 9204692 PCTABS00011 A security device comprises first and second diffractive structures contained within a surface relief structure. The structures are such that the device responds to illumination (2) at a first, visible wavelength to generate a first, visible pattern while any pattern generated by the second structure is not substantially visible at that wavelength, and the device responds to illumination (12) at a second wavelength substantially different from the first wavelength to generate a second pattern suitable for machine reading while any pattern generated by the first structure is substantially suppressed relative to the machine readable pattern at that wavelength.
Andreassen Jon
Drinkwater Kenneth John
Ezra David
Holmes Brian William
Borden Ladner Gervais Llp
de La Rue Holographics Limited
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