Marking diamond

B - Operations – Transporting – 44 – B

Patent

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Details

B44B 7/00 (2006.01) B28D 5/00 (2006.01)

Patent

CA 2291042

In order to provide an invisible information mark on a facet of a diamond gemstone, a plasma resist is applied to the whole of the exposed surface of the gemstone, a layer of gold is applied to the facet in the region where the mark is to be formed, a selected zone of the metal and resist layers is ablated by ultraviolet laser ablation to form a mask on the facet, an electrical connection is provided to the metal layer, and the facet is plasma etched through the mask in order to apply a mark of appropriate depth, the resist and metal layers subsequently being removed.

Afin de réaliser une gravure indicative invisible sur l'une des facettes d'un diamant, on applique un résist à plasma sur toute la surface exposée de ce diamant, avant d'appliquer une couche d'or sur ladite facette, à l'endroit où la gravure est destinée à être réalisée. On choisit une zone des couches de métal et de résist pour à traiter par ablation au laser ultraviolet, afin de former un masque sur la facette, une liaison électrique étant ménagée sur la couche de métal. Cette facette est ensuite soumise à une attaque au plasma afin de réaliser, à travers le masque, une gravure de profondeur adéquate, les couches de résist et de métal étant retirées ultérieurement.

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