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Laser reactive dyes for DVD copy protection system

  • US 20050186382A1
  • Filed: 04/25/2005
  • Published: 08/25/2005
  • Est. Priority Date: 06/17/2002
  • Status: Abandoned Application
First Claim
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1. A method for fabricating an optical medium readable by an optical reader, said method comprising the steps of:

  • (a) molding a substrate so as to have a first major surface with information pits and information lands thereon and a second major surface that is relatively planar;

    (b) applying a transient optical state change security material capable of converting from a first optical state to a second optical state upon exposure to the laser of said optical reader to at least a position of said first major surface;

    (c) applying a reflective material over the first major surface so as to cover said information pits and information lands;

    wherein the transient optical state change security material comprises;

    embedded imagewhere R6, R7, R8, and R9 are alkylamino and R1, R2, R3, R4 and R5 are selected from the group consisting of hydrogen, alkyl, aryl, alkoxy, thioalkoxy, alkylamino, nitro, amino and halogen.

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