Optical memories incorporating diffraction gratings

Details Optical memories incorporating diffraction gratings Optical memories incorporating diffraction gratings

G - Physics

06

K

G06K 9/00 (2006.01) G03G 13/01 (2006.01) G06K 1/12 (2006.01) G06K 19/16 (2006.01) G11B 7/00 (2006.01)

Patent

CA 2110681

2110681 9222039 PCTABS00018 An optical memory diffraction grating (80) having a plurality of spaced ridges (81) each having a plurality of optically reflective facets (82, 83 and 84). When illuminated with an incident light beam (85) the grating (80) produces a number of diffracted beams (86, 87, 88) corresponding to the number of facets. The diffracted beams can be machine read by a reading device which produces a reading light beam (131) directed at the grating. The reading device has a plurality of detectors (135) positioned to be illuminated by the diffracted light beams. Information can be stored in the optical memory by locally changing the optical properties of the grating (80). The grating (80) may be employed in security cards and documents. The grating (80) may be arranged as a bar code (11) or as a pixelgram (160). Reading, writing and erasing devices are also claimed.

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