US 12,461,283 B2
Optical article with very low reflection in the visible region and in the near infrared region
Ilya Bolshakov, Dallas, TX (US); and William Trottier-Lapointe, Dallas, TX (US)
Assigned to Essilor International, Charenton-le-Pont (FR)
Appl. No. 17/922,891
Filed by Essilor International, Charenton-le-Pont (FR)
PCT Filed May 6, 2021, PCT No. PCT/EP2021/062028
§ 371(c)(1), (2) Date Nov. 2, 2022,
PCT Pub. No. WO2021/224405, PCT Pub. Date Nov. 11, 2021.
Claims priority of application No. 20305459 (EP), filed on May 7, 2020.
Prior Publication US 2023/0176255 A1, Jun. 8, 2023
Int. Cl. G02B 1/115 (2015.01)
CPC G02B 1/115 (2013.01) 19 Claims
OG exemplary drawing
 
1. 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 a multilayered interferential coating comprising a stack of at least one high refractive index layer (HI) having a refractive index higher than or equal to 1.55 and at least one low refractive index layer (LI) having a refractive index layer lower than 1.55, wherein said multilayered interferential coating has a mean reflection factor for wavelengths ranging from 445 nm to a predetermined maximum wavelength higher than or equal to 1185 nm, noted Rm (445-1185), that is lower than or equal to 2.9% at an angle of incidence lower than or equal to 45°; wherein said multilayered interferential coating comprises at least, in the direction moving towards said substrate: one LI layer having a physical thickness of from 95 nm to 130 nm; one HI layer having a physical thickness of from 30 nm to 60 nm; one LI layer having a physical thickness of from 5 nm to 25 nm; one HI layer having a physical thickness of from 80 nm to 130 nm; one LI layer having a physical thickness of from 5 nm to 40 nm; one HI layer having a physical thickness of from 15 nm to 50 nm; and wherein the multilayered interferential coating total thickness is lower than or equal to 650 nm.