Structure arrangement having an optical-diffraction effect

Details Structure arrangement having an optical-diffraction effect Structure arrangement having an optical-diffraction effect

G - Physics

06

K

G06K 19/16 (2006.01)

Patent

CA 2220248

The invention relates to a structural arrangement consisting of one or more surface regions having optically diffractive structures, especially for visually identifiable security devices for valuable documents, e.g. bank notes, credit cards, identity papers or cheques or similar objects to be protected. To make it even more difficult to forge and especially copy such a structural arrangement, the invention proposes to form the structure in such a way that, to generate certain optical information in certain viewing directions, there are partial regions (10, 12, 14, 32, 34) in one or more of the surface areas (8, 30) with an identical structure (16, 18, 20; 36, 38) as far as the structure parameter of the optical depth, and that the optical depth of the structure (16, 20; 36) is constant over the extent of a partial region (10, 14; 32) but different from the optical depth of the structure (18; 38) of another partial region (12; 34).

L'invention concerne une configuration structurale comprenant des zones surfaciques comportant une ou plusieurs structures à action optiquement diffractive, notamment des éléments de sécurité optiques identifiables visuellement, pour documents de sécurité, tels que billets de banque, cartes de crédit, papiers d'identité ou chèques ou tout autre article à protégéer. Afin de limiter les risques de falsification, notamment de copie, d'une configuration structurale de ce type, il est prévu selon l'invention de concevoir ladite configuration structurale de manière que pour engendrer des informations optiques déterminées dans des sens d'observation déterminés, elle comporte dans une ou plusieurs des zones surfaciques (8, 30), des zones partielles (10, 12, 14, 32, 34) ayant une structure identique (16, 18, 20; 36, 38) jusqu'au paramètre structural de la profondeur optique. La profondeur optique de la structure (16, 20; 36) est constante sur toute l'étendue d'une zone partielle (10, 14; 32), mais diffère cependant de la profondeur optique de la structure (18; 38) d'une autre zone partielle (12; 34).

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