Optical security articles and methods for making same

B - Operations – Transporting – 42 – D

Patent

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Details

B42D 15/10 (2006.01) B42D 15/00 (2006.01)

Patent

CA 2203645

Optical security articles (1) and methods of making same are described comprising a first layer (14) substantially transparent to visible light and having a first refractive index, the first layer having a relief pattern on a first surface (18) thereof and a substantially smooth second surface (16), and an adhesive layer (24) coterminating with the first layer. The adhesive layer substantially completely fills and makes contact with a first portion of the plurality of geometric concavities, the adhesive layer having a second refractive index which is substantially similar to the first refractive index of the first layer. A second portion of the plurality of geometric concavities are precluded from contact with the adhesive layer by a corresponding plurality of separation layers (34), each separation layer having a separation layer refractive index which is different from the refractive index of the first layer.

La présente invention concerne des articles optiques de sécurité (1) et des procédés de fabrication. Ces articles comprennent une première couche (14) sensiblement transparente à la lumière visible et qui présente un premier indice de réfraction. Cette première couche a un motif en relief sur une première de ses surfaces (18) et une deuxième surface sensiblement unie (16) ainsi qu'une couche adhésive (24) contiguë à la première couche. La couche adhésive remplit sensiblement complètement une première partie des creux de formes géométriques, et ladite couche adhésive a un deuxième indice de réfraction qui est sensiblement analogue au premier indice de réfraction de la première couche. Tout contact entre une deuxième partie des creux de formes géométriques et la couche adhésive est inhibé par un nombre correspondant de couches séparatrices (34) dont chacune a un indice de réfraction différent de celui de la première couche.

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