DE2547768

DE2547768

A document such as an ID-card is provided with check markings comprising a material based upon rare earth metals and having the property that when excited by IR radiation it emits visible light. When checking the document, the document is irradiated with pulsed IR radiation, the occurrence of corres...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: MALMBERG, THOR ANDERS HELGE, STOCKHOLM, SE, SJOEQUIST, STIG ROLAND, VALLENTUNA, SE, HOEGBERG, KNUT GOERAN, HAESSELBY, SE
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
CHECKING-DEVICES
COIN-FREED OR LIKE APPARATUS
COMPUTING
COUNTING
DECORATIVE ARTS
HANDLING RECORD CARRIERS
PERFORMING OPERATIONS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
SPECIAL DESIGNS OR PICTURES
TRANSPORTING
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Beschreibung
Zusammenfassung:A document such as an ID-card is provided with check markings comprising a material based upon rare earth metals and having the property that when excited by IR radiation it emits visible light. When checking the document, the document is irradiated with pulsed IR radiation, the occurrence of corresponding visible light pulses originating from said material being detected. The visible light pulses have well defined rise and decay times dictated by the check material used, which fact is used to check that output pulses from the detector are the correct ones for indicating the genuiness of the document.