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1. (WO2018029251) OPTICAL ARTICLE COMPRISING AN INTERFERENTIAL COATING WITH A HIGH REFLECTION IN THE NEAR INFRARED REGION (NIR)

Pub. No.:    WO/2018/029251    International Application No.:    PCT/EP2017/070196
Publication Date: Fri Feb 16 00:59:59 CET 2018 International Filing Date: Thu Aug 10 01:59:59 CEST 2017
IPC: G02B 1/115
G02B 5/28
G02C 7/10
Applicants: ESSILOR INTERNATIONAL
Inventors: DING, Xinzhao
Title: OPTICAL ARTICLE COMPRISING AN INTERFERENTIAL COATING WITH A HIGH REFLECTION IN THE NEAR INFRARED REGION (NIR)
Abstract:
This invention relates to an optical article comprising a transparent substrate with a front main face and with a rear main face, at least one of the main faces being coated with an interferential coating, characterized in that said interferential coating comprises a stack comprising : - at least one layer having a low refractive index which is <1.6, called "LI layer", - at least one HI/VHI/H I triplet of three layers composed of one layer: • having a very high refractive index which is ≥ 2.1, called "VHI layer", • surrounded on both sides by two layers having a high refractive index which is ≥ 1.6, called "HI layers", and such that the mean reflectance in ultra violet (UV) region Ruv of said interferential coating is lower than or equal to 10 % at an angle of incidence comprised between 30° and 45°.