	US 12,111,521 B2
	Optical lens having an interferential coating and a multilayer system for improving abrasion-resistance
Christophe Valenti, Charenton-le-Pont (FR); Frédéric Guillain, Charenton-le-Pont (FR); William Trottier-Lapointe, Charenton-le-Pont (FR); and Xingzhao Ding, Singapore (SG)
Assigned to Essilor International, Charenton-le-Pont (FR)
Appl. No. 17/293,205
Filed by Essilor International, Charenton-le-Pont (FR)
PCT Filed Nov. 18, 2019, PCT No. PCT/EP2019/081685 § 371(c)(1), (2) Date May 12, 2021, PCT Pub. No. WO2020/104391, PCT Pub. Date May 28, 2020.
Claims priority of application No. 18306519 (EP), filed on Nov. 19, 2018.
Prior Publication US 2022/0011600 A1, Jan. 13, 2022
Int. Cl. G02C 7/02 (2006.01); G02B 5/28 (2006.01); G02C 7/10 (2006.01); G02B 1/116 (2015.01)

CPC G02C 7/107 (2013.01) [G02B 5/28 (2013.01); G02C 7/022 (2013.01); G02B 1/116 (2013.01)]

20 Claims

1. An optical lens comprising:

a substrate having a front main face and a rear main face, at least one main face of which being successively coated with:

an abrasion and/or scratch resistant coating;

(A) a first high refractive index sheet having a refractive index higher than 1.55, which does not comprise any Ta₂O₅layer;

(B) a second low refractive index sheet having a refractive index of 1.55 or less in direct contact with the former sheet;

(C) a third high refractive index sheet having a refractive index higher than 1.55 in direct contact with the former sheet;

a monolayer sub-layer having a thickness higher than or equal to 100 nm in direct contact with the former sheet (C);

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; and

the mean reflection factor R_UVon said rear main face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 10%, for an angle of incidence of 35°.