Constituting security elements with optical diffraction...

Details Constituting security elements with optical diffraction... Constituting security elements with optical diffraction...

G - Physics

07

D

G07D 7/12 (2006.01) G07D 7/02 (2006.01)

Patent

CA 2300961

The invention concerns the constitution of security elements with optical diffraction effect, and a device for controlling such elements. The use of holograms and other security elements with optical diffraction effect for protecting documents and other valuable papers, as well as bank notes against forgery is becoming more and more frequent presently. The element with optical diffraction effect comprises a discontinuous metal coating and/or partial metal coats and/or metal coat zones in different planes, representing an electric data coding, corresponding to the objective. The device comprises a scanner with capacitive functioning. Said scanner consists of a plurality of emitting electrodes placed side by side and a receiving electrode extending parallel to said emitting electrodes arrangement.

L'invention concerne la constitution d'éléments de sécurité à effet optique de diffraction, et un dispositif utilisé pour le contrôle de tels éléments. L'utilisation d'hologrammes et d'autres éléments de sécurité à effet optique de diffraction pour la protection de documents et d'autres papiers de valeur, ainsi que des billets de banque contre des falsifications doit être actuellement de plus en plus fréquente. L'élément à effet de diffraction optique comporte, selon l'invention, une couche de métallisation discontinue et/ou des couches métalliques partielles et/ou des zones de couches métalliques dans différents plans, qui représentent un codage électrique, conforme à l'objectif, d'informations. Le dispositif comporte un explorateur à fonctionnement capacitif. Cet explorateur est constitué d'une pluralité d'électrodes d'émission placées les unes à côté des autres et d'une électrode de réception s'étendant parallèlement à cet agencement d'électrodes d'émission.

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