Information storage medium and method for detecting forgeries

Details Information storage medium and method for detecting forgeries Information storage medium and method for detecting forgeries

1996-01-05

1998-06-02

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235491, 235494, 235454, 283 72, 283 91, 283904, G06K 710

Patent

active

057603847

ABSTRACT:
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 and a second reflectance at a comparison wavelength near the peak wavelength, and judging if the subject medium is real or not. The rays at the comparison wavelength are not very much absorbed by the absorber.

REFERENCES:
patent: 4359633 (1982-11-01), Bianco
patent: 4538059 (1985-08-01), Rudland
patent: 4663518 (1987-05-01), Borror et al.
patent: 4853525 (1989-08-01), Vogt et al.
patent: 5210411 (1993-05-01), Oshima et al.
patent: 5525798 (1996-06-01), Berson et al.
patent: 5532104 (1996-07-01), Goto

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