Optical data element

Details Optical data element Optical data element

G - Physics

06

K

G06K 19/06 (2006.01) G06K 7/10 (2006.01) G11B 7/24 (2006.01)

Patent

CA 2159337

An optical data element (10) in- cludes a plurality of diffraction zones (12) wherein each zone contains a multiplicity of diffraction gratings. These zones (12) may be illuminated and the resultant one or more dif- fracted beams detected to provide a signature for the element consisting of a series of discrete signature sig- nals each generated by the plurality of zones and each including portions of relatively different intensities. At least one of the diffraction zones (12) has a segment (16) thereof modified whereby to discernibly alter at least one of the discrete signature signals of the signature and to thereby form a data segment of the data element.

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