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Optical storage identification card and read/write system

  • US 4,663,518 A
  • Filed: 10/31/1985
  • Issued: 05/05/1987
  • Est. Priority Date: 09/04/1984
  • Status: Expired due to Fees
First Claim
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1. An identification card comprising:

  • a substrate;

    a first color imaging compound disposed in overlying relation with respect to said substrate and comprising a first radiation sensitive dye responsive to incident radiant energy within a first select range of spectral wavelengths for effecting a visually discernible change in the spectral absorption characteristics thereof;

    a second color imaging compound disposed in overlying relation with respect to said substrate and comprising a second radiation sensitive dye responsive to incident radiant energy within a second select range of spectral wavelengths different from said first select range of spectral wavelengths for effecting a visually discernible change in the spectral absorption characteristics thereof; and

    a third color imaging compound disposed in overlying relation with respect to said substrate and comprising a third radiation sensitive dye responsive to incident radiant energy within a third select range of spectral wavelengths different from said first and second select ranges of spectral wavelengths for effecting a visually discernible change in the spectral absorption characteristics thereof, at least one portion of said first, second and third imaging compounds being selectively exposed to radiant energy within said first, second and/or third select ranges to provide a visually discernible and understandable colored image and a second portion of said first, second and/or third imaging compounds outside said first portion being selectively exposed to radiant energy within said first, second and/or third select ranges to provide a non-visually understandable machine readable binary code.

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