Information storage medium, method and apparatus for judging...

Details Information storage medium, method and apparatus for judging... Information storage medium, method and apparatus for judging...

G - Physics

11

B

G11B 7/00 (2006.01) G06K 7/10 (2006.01) G06K 7/12 (2006.01) G06K 19/06 (2006.01)

Patent

CA 2166250

An information storage medium has a base portion and a code storage portion. The code storage portion is disposed on the base portion and contains an infrared absorber which absorbs substantially only infrared rays within a narrow wavelength band. If a real information storage medium is produced like that, subject mediums are judged real or not by a method includes the steps of emitting rays to the subject medium, receiving rays reflected from the subject medium, detecting a first reflectance at the peak absorption wavelength (.lambda.0) and a second reflectance at a comparison wavelength (.lambda.1) near the peak wavelength (.lambda.0), and judging if the subject medium is real or not. The rays at the comparison wavelength (.lambda.1) are not very much absorbed by the absorber.

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