Security device

Details Security device Security device

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.

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