Optical article comprising an antireflective coating with a low reflection both in the ultraviolet region and in the visible region

US9488852B2 · kind B2 · utility

Assignee

• Essilor International (Compagnie Generale d'Optique) · FR

Inventors

• Herve Cado · Charenton-le-Pont, FR
• Francisco De Ayguavives · Charenton-le-Pont, FR
• Olivier Pophillat · Charenton-le-Pont, FR

Key dates

• Filing date: Aug 27, 2014
• Grant date: Nov 8, 2016
• Expiry date: Aug 27, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C2202/16
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

This invention relates to an ophthalmic lens with a low reflection both in the ultraviolet region and in the visible region, comprising a substrate provided on its rear main face with a multilayered antireflective coating (3-7 layers) comprising a stack of at least one layer with a high refractive index and at least one layer with a low refractive index, having a mean reflection factor on the rear face in the visible region Rm lower than or equal to 1.15%, a mean light reflection factor on the rear face in the visible region Rv lower than or equal to 1%, a mean reflection factor RUV on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, lower than 5%, for angles of incidence of 30° and 45°, the antireflective coating outer layer being a silica-based layer. The lens according to the invention does especially prevent the reflection of the UV radiation produced by light sources located behind the wearer.