Transparent photochromic article including an...

G - Physics – 02 – B

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G02B 1/11 (2006.01) B32B 17/06 (2006.01) C03C 17/34 (2006.01) C03C 17/36 (2006.01) G02B 5/23 (2006.01) G02C 7/10 (2006.01)

Patent

CA 2244230

A transparent photochromic article including a transparent substrate including a photochromic material; and an anti-reflection surface coating thereon, produced with a plurality of overlapping layers incorporating, alternatively a first and a second material having respectively higher and lower refractive indices, the anti-reflection coating including: a first layer including said first material having an optical thickness of approximately 20 to 45nm; a second layer including said second material having an optical thickness of approximately 25 to 45nm; a third layer including said first material having an optical thickness of approximately 220 to 250nm; and a fourth layer including said second material having an optical thickness of approximately 95 to 115nm. Other anti-reflection coatings are also described and claimed.

La présente invention concerne un objet photochromique transparent comprenant un support transparent qui comporte une matière photochromique, et un revêtement superficiel antiréfléchissant, réalisé en plusieurs couches chevauchantes comprenant alternativement une première et une deuxième matière ayant respectivement des indices de réfraction plus élevés et plus bas. Le revêtement antiréfléchissant comprend une première couche comportant la première matière mentionnée, dont l'épaisseur optique est approximativement de 20 à 45 nm; une deuxième couche comportant la deuxième matière mentionnée, dont l'épaisseur optique est approximativement de 25 à 45 nm; une troisième couche comportant la première matière mentionnée, dont l'épaisseur optique est approximativement de 220 à 250 nm, et une quatrième couche comportant la deuxième matière mentionnée, dont l'épaisseur optique est d'environ 95 à 115 nm. L'invention concerne aussi d'autres revêtements antiréfléchissants, qui figurent dans la description et les revendications.

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