Identity card with a humanly visible authenticity feature
First Claim
1. A multilayer data carrier bearing general printed data, said data carrier having at least one opaque layer and at least one transparent layer, said transparent layer comprising a nonself-supporting layer which is thin compared to the other layers of the data carrier, said transparent layer containing additive which is absorbent for the energy of a laser beam, said transparent layer having visibly perceptible information incorporated therein in the form of thermal alteration of the transparent layer resulting from the absorption of laser beam energy, which alteration produces local changes in the optical properties of the layer.
1 Assignment
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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.
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Citations
29 Claims
- 1. A multilayer data carrier bearing general printed data, said data carrier having at least one opaque layer and at least one transparent layer, said transparent layer comprising a nonself-supporting layer which is thin compared to the other layers of the data carrier, said transparent layer containing additive which is absorbent for the energy of a laser beam, said transparent layer having visibly perceptible information incorporated therein in the form of thermal alteration of the transparent layer resulting from the absorption of laser beam energy, which alteration produces local changes in the optical properties of the layer.
Specification