Method and device for structuring a solid body surface with...

B - Operations – Transporting – 23 – K

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Details

B23K 26/06 (2006.01) B21D 22/02 (2006.01) B23K 26/00 (2006.01) B23K 26/40 (2006.01) B31F 1/07 (2006.01) B42D 15/00 (2006.01)

Patent

CA 2757146

In the method for structuring at least one area of a solid body surface (9,10) provided with a ta-C coating, a mask (18) in the homogenous spot of the optical system is used in order to shape the beam in the mask projection technique and then a diaphragm (6) in front of the imaging optics. A structure is applied by means of an excimer laser (1) having pulse durations in the nanosecond range, a number of mask and diaphragm combinations (18, 6) being arranged in a exchanger device (28) and the exchanger device being adapted to place both one of the masks (18) and one of the diaphragms (6) in the beam path of the laser independently of each other, the masks (18) and diaphragms (6) being arranged in holders while being displaceable linearly or rotatively and rotatable about themselves. This method allows the rational manufacture of very complex, extremely fraud-resistant authentication features and/or of esthetically attractive, optical diffraction effective colored patterns. A device with such features is also defined.

Selon le procédé de structuration d'une zone de la surface d'un corps solide (9, 10) présentant un revêtement ta-C, un masque (18) dans la zone homogène du système optique est utilisé pour former le faisceau selon la technique de projection de masque, puis une membrane (6) placée en avant de l'optique de projection. Une structure est appliquée au moyen d'un laser à excimères (1) dont la durée d'impulsion est de l'ordre de la nanoseconde, un certain nombre de combinaison de masques et de membranes (18, 6) étant disposé dans le dispositif échangeur (28), lequel dispositif échangeur est conçu pour placer à la fois l'un des masques (18) et l'une des membranes (6) dans le trajet du faisceau indépendamment l'un de l'autre, les masques (18) et les membranes (6) étant agencés dans des supports et pouvant être déplacés linéairement ou par rotation, ou bien tourner sur eux-mêmes. Ce procédé rend possible l'obtention rationnelle de caractéristiques très complexes d'authentification résistant à la fraude et/ou de motifs colorés efficaces par diffraction optique, d'une grande qualité esthétique. Est également décrit un dispositif doté de telles caractéristiques.

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