Invention Grant
- Patent Title: Optical article comprising an antireflective coating with a low reflection both in the ultraviolet region and in the visible region
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Application No.: US16126130Application Date: 2018-09-10
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Publication No.: US10649232B2Publication Date: 2020-05-12
- Inventor: Hervé Cado , Francisco De Ayguavives , Olivier Pophillat
- Applicant: ESSILOR INTERNATIONAL
- Applicant Address: FR Charenton-le-Pont
- Assignee: ESSILOR INTERNATIONAL
- Current Assignee: ESSILOR INTERNATIONAL
- Current Assignee Address: FR Charenton-le-Pont
- Agency: Norton Rose Fulbright US LLP
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@77465438
- Main IPC: G02C7/02
- IPC: G02C7/02 ; G02B1/115 ; G02B5/28 ; G02B1/11 ; G02C7/10 ; G02B1/116

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.
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