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Multilayer data carrier and methods for writing on a multilayer data carrier

  • US 5,298,922 A
  • Filed: 12/04/1989
  • Issued: 03/29/1994
  • Est. Priority Date: 12/02/1988
  • Status: Expired due to Term
First Claim
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1. A data carrier comprising:

  • overlapping layers of different contrasting colors showing information in humanly identifiable form through local removal of areas of an individual layer and exposure of areas of a deeper layer of a different color by a laser beam, said overlapping layers includingat least one thermal breakdown second layer located under a first colored non-metallic layer configured to be permeable by a laser beam, whereby said at least one thermal breakdown second layer is configured to be broken down at least partly under the effect of a laser beam, and wherein said data carrier is configured so that conversion of energy supplied by the laser beam in said at least one second layer and resulting thermal breakdown of said at least one second layer locally remove said first colored non-metallic layer.

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