公开(公告)号：US20210397025A1

公开(公告)日：2021-12-23

申请号：US17285591

申请日：2019-10-17

Applicant: Essilor International

Inventor： Benoit EMPRIN ,  Nicolas MAITRE ,  Sébastien CHIAROTTO

IPC: G02C7/10 ,  G02C7/02

Abstract: The invention relates to an optical article comprising a substrate having at least one main face successively coated with a layer comprising chromium, silicon and oxygen, a monolayer sub-layer having a thickness higher than or equal to 100 nm, a multilayer interferential coating comprising a stack of at least one high refractive index layer having a refractive index higher than 1.55 and at least one low refractive index layer having a refractive index of 1.55 or less, wherein the ratio (I) is higher than or equal to 1.5, and the optical article has a Bayer value determined in accordance with the ASTM F735-81 standard higher than or equal to 7. R D = thickness ⁢ ⁢ of ⁢ ⁢ the ⁢ ⁢ outermost ⁢ ⁢ low ⁢ ⁢ refractive ⁢ ⁢ index layer ⁡ ( s ) ⁢ ⁢ of ⁢ ⁢ the ⁢ ⁢ interferential ⁢ ⁢ coating thickness ⁢ ⁢ of ⁢ ⁢ the ⁢ ⁢ outermost ⁢ ⁢ high ⁢ ⁢ refractive ⁢ ⁢ index layer ⁡ ( s ) ⁢ ⁢ of ⁢ ⁢ the ⁢ ⁢ interferential ⁢ ⁢ coating ( I )