Secure, optically-readable data medium
First Claim
1. / A secure, optically readable data medium comprising a data-carrying zone that is readable by a read light beam, and at least a portion that is photosensitive, being provided with a photosensitive material and exposed to the read light beam, the photosensitive material presenting at least one optical property that can be modified by the read light beam, wherein the photosensitive material contains an active compound taken from the diarylethene family.
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Accused Products
Abstract
A secure, optically readable data medium comprises a data-carrying zone readable by a read light beam, and at least a portion that is photosensitive, being provided with a photosensitive material and exposed to the read light beam. The photosensitive material contains an active compound taken from the family of diarylethenes.
22 Citations
21 Claims
- 1. / A secure, optically readable data medium comprising a data-carrying zone that is readable by a read light beam, and at least a portion that is photosensitive, being provided with a photosensitive material and exposed to the read light beam, the photosensitive material presenting at least one optical property that can be modified by the read light beam, wherein the photosensitive material contains an active compound taken from the diarylethene family.
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21. / A process for checking that an optically readable data medium is an original, said optically readable data medium comprising a data carrying zone that is readable by a read light beam and at least a portion that is photosensitive, being provided with a photosensitive material and exposed to the read light beam, the photosensitive material presenting at least one optical property that can be modified by the read light beam, the photosensitive material containing an active compound taken from the diarylethenes family,
said process comprising at least a first step in which the data medium is read by said read light beam, and a second step in which one checks that said at least one optical property of the photosensitive material was modified during said first step.
Specification