Optical record cards

Details Optical record cards Optical record cards

G - Physics

11

B

352/57

G11B 7/24 (2006.01) G06K 19/04 (2006.01) G06K 19/06 (2006.01) G11B 7/0033 (2006.01)

Patent

CA 1312951

63356-1707 ABSTRACT An optical information storage card having a rectangular format and comprising (a) a surface having, on at least one side thereof, surface relief formations forming an optically machine readable information surface; and (b) a protection layer being in overlying juxtaposed relationship to the information surface. The substrate and the protection layer are transmissive to a selected range of electromagnetic radiation usable for optically reading the information surface. The information surface has a generally spiral or concentric format whereby the information surface can be read as the card is rotated round at least one axis.

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