Optical article coated with an underlayer and with a...

Details Optical article coated with an underlayer and with a... Optical article coated with an underlayer and with a...

G - Physics

02

B

G02B 1/11 (2006.01)

Patent

CA 2656492

The invention relates to an optical article having anti-reflection properties which is optionally antistatic and which possesses high heat resistance and high abrasion resistance, and to the method of manufacturing it. The article of the invention comprises a substrate and, from the substrate up: - an underlayer comprising an SiO2-based layer, said SiO2-based layer having a thickness of greater than or equal to 75 nm and being free of Al2O3; and - a multi-layer anti-reflection coating comprising a stack of at least one high-refractive-index layer and at least one low-refractive-index layer, of which all of the low-refractive-index layers comprise a mixture of SiO2 and Al2O3, and of which the high-refractive-index layers are not layers which absorb within the visible region, comprising a substoichiometric titanium oxide, and reducing the relative transmittance factor in the visible region (Tv) of the optical article by at least 10% relative to the same article not containing said layers which absorb within the visible region.

L'invention concerne un article d'optique à propriétés anti-reflets, éventuellement antistatique, possédant une résistance thermique et une résistance à l'abrasion élevées, ainsi que son procédé de fabrication. L'article de l'invention comprend un substrat et, en partant du substrat : - une sous-couche comprenant une couche à base de SiO2, ladite couche à base de SiO2 ayant une épaisseur supérieure ou égale à 75 nm et étant exempte d'Al2O3; et - un revêtement anti-reflets multicouches comprenant un empilement d'au moins une couche de haut indice de réfraction et d'au moins une couche de bas indice de réfraction, dont toutes les couches de bas indice de réfraction comprennent un mélange de SiO2 et d'Al2O3, et dont les couches de haut indice de réfraction ne sont pas des couches absorbant dans le visible comprenant un oxyde de titane sous- stoechiométrique et réduisant le facteur relatif de transmission dans le visible (Tv) de l'article d'optique d'au moins 10 % par rapport au même article ne comportant pas lesdites couches absorbant dans le visible.

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