Diffraction surface data detector

Details Diffraction surface data detector Diffraction surface data detector

G - Physics

06

K

G06K 7/10 (2006.01) G11B 7/0033 (2006.01) G11B 7/0065 (2006.01)

Patent

CA 2143952

A method and apparatus (301) for detecting information stored on an optical memory diffraction surface (101). A reading light beam (102) illuminates the surface (101). At least one diffracted light beam (104) is produced, with the light beam (104) hav- ing a predetermined intensity pattern. A sensor (309) is illuminated by a diffracted beam (308) and is used for authentication pur- poses. A second sensor (319) is illuminated by a second diffracted beam (308), which second beam (308) passes through an opti- cal lens (imaging lens) (304) so that an image is produced on the sensor (319). The sensor (309) produces a signal for authentica- tion purposes which signal can be compared to a "template" signal. The signal generated by the sensor (319) has additional information to that information contained in the signal produced by the sensor (309).

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