An identity card with a humanly visable authenticity feature and a method for producing it

The identity card (1) contains at least one layer (7) which is suitable for lettering. Information is written into this laye using a laser beam. The information is made irreversibly visible by changes of the optical properties effected by the laser beam The layer to be lettered is a lacquer layer in...

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Bibliographische Detailangaben
Hauptverfasser:	MATTHIAS BERGMANN, REINHARD KRUSCHE, ERWIN LOB, HORST HENKENSCHUH
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BOOK COVERS BOOKBINDING CALCULATING COMPUTING COUNTING DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR FILES HANDLING RECORD CARRIERS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM LOOSE LEAVES MOVABLE-STRIP WRITING OR READING APPARATUS PERFORMING OPERATIONS PHYSICS PRESENTATION OF DATA PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR RECOGNITION OF DATA RECORD CARRIERS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SPECIAL PRINTED MATTER TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The identity card (1) contains at least one layer (7) which is suitable for lettering. Information is written into this laye using a laser beam. The information is made irreversibly visible by changes of the optical properties effected by the laser beam The layer to be lettered is a lacquer layer in which additives, which are absorbent for the wavelengths of the laser writer introduced.