Security device for security document

A security device for verifying an authenticity of a security document comprises an at least partially transparent substrate with a first surface and a second surface. A first pattern is arranged on the first surface. This first pattern is derivable using a first seed pattern. A second pattern is ar...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Sauter, Dieter, Chosson, Sylvain
Format:	Patent
Sprache:	eng
Schlagworte:	BOOK COVERS BOOKBINDING CHECKING-DEVICES COLOUR PRINTING DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR FILES HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING LINING MACHINES LOOSE LEAVES MOVABLE-STRIP WRITING OR READING APPARATUS PERFORMING OPERATIONS PHYSICS PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES SPECIAL PRINTED MATTER STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A security device for verifying an authenticity of a security document comprises an at least partially transparent substrate with a first surface and a second surface. A first pattern is arranged on the first surface. This first pattern is derivable using a first seed pattern. A second pattern is arranged on said second surface. This second pattern is derivable using the first seed pattern and using a second seed pattern. Transmittances and reflectivities of the first and second patterns are selected such that in a reflection viewing mode, only the first seed pattern is visible. In a transmission viewing mode, however, only the second seed pattern is visible.