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US 5,729,323 AGranted
Light-absorbing and anti-reflective coating for sunglasses
AssigneeBaush & Lomb Incorporated
InventorsAmy J. Arden, Michael J. Cumbo
Life of this patent
Estimating the term…
Abstract
A sunglass lens having improved anti-reflection and transmittance comprises a lens-shaped substrate and a coating formed on the concave surface of the lens. The first layer deposited adjacent to the concave surface of the lens comprises a titanium suboxide material, the second layer comprises a material having a high refractive index, and the third layer comprises a material having a low refractive index.
Claims12
A sunglass lens comprising a substrate in the shape of a lens which substrate has a concave surface and a convex surface, the concave surface having a coating comprising:
- a first layer deposited adjacent to the concave surface of the substrate, said first layer comprising TiO.sub.x wherein x is about 0.2 to 1.5;
- a second layer deposited adjacent to the first layer, said second layer comprising a material having a refractive index of about 1.80 to 2.50;
- and
- a third layer deposited adjacent to the second layer, said second layer comprising a material having a refractive index of about 1.35 to 1.60, wherein said first layer reduces transmittance of light therethrough by at least 10% and wherein the luminous reflectance at an interface of said coating with air is no greater than 2%.
1 more element
Dependencies are inferred from the claim text.