Compound film for an identity card with a humanly visible authenticity feature
First Claim
1. A compound film (26) suitable for the manufacture of a multilayer data carrier (1), said data carrier comprising said compound film and at least one additional layer, wherein the compound film comprises a plurality of coextruded layers and has at least one transparent layer (27, 39) which is sensitized by laser beam absorbing additives so that information in the form of local alterations of optical properties of the transparent layer can be introduced into the transparent layer by subjecting the transparent layer to the energy of a laser beam to change the color of the transparent layer;
- and wherein said laser beam sensitized transparent layer is thin as compared to said at least one additional layer of the data carrier.
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Accused Products
Abstract
A multilayer data carrier is described which bears general printed data and furthermore has a transparent layer containing additives which are absorbent for a laser beam. The transparent layer is designed so that it exists in the card compound as a thin, nonself-supporting layer.
110 Citations
8 Claims
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1. A compound film (26) suitable for the manufacture of a multilayer data carrier (1), said data carrier comprising said compound film and at least one additional layer, wherein the compound film comprises a plurality of coextruded layers and has at least one transparent layer (27, 39) which is sensitized by laser beam absorbing additives so that information in the form of local alterations of optical properties of the transparent layer can be introduced into the transparent layer by subjecting the transparent layer to the energy of a laser beam to change the color of the transparent layer;
- and wherein said laser beam sensitized transparent layer is thin as compared to said at least one additional layer of the data carrier.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
Specification