# US 2022/0035077 A1 · An optical device with reduced reflection in deep red, near infrared and visible ranges > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0035077 A1 - Document ID: US20220035077A1 - Status: Published application - Kind: A1 - Application number: 17/276,365 - Filed: 2019-09-16 - Published: 2022-02-03 - Earliest claimed: 2018-09-20 - Assignees: Essilor International - Applicants: Essilor International - Inventors: Francisco DE AYGUAVIVES - Web page: https://patentgrep.com/patent/US20220035077A1 ## CPC - G02B 1/113: using inorganic layer materials only - G02B 1/115: Multilayers - G02B 5/0816: {Multilayer mirrors, i.e. having two or more reflecting layers (G02B5/0883, G02B5/0891 take precedence)} - G02B 5/0825: {the reflecting layers comprising dielectric materials only} - G02B 5/0833: {comprising inorganic materials only} - G02B 5/281: {designed for the infrared light} - G02B 5/282: {reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection} - G02C 7/022: {Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence)} - G02C 7/107: {Interference colour filters} - G02B 27/0093: {with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking} - G02B 27/0172: {characterised by optical features} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00) ## Abstract This optical device comprises an ophthalmic lens and a light source emitting in the deep red and near infrared region. The ophthalmic lens has front and rear faces coated with interferential coatings. The mean reflectance of the rear interferential coating is lower than or equal to 2.5% for wavelengths ranging from 700 nm to a predetermined maximum wavelength lower than or equal to 2500 nm, at an angle of incidence lower than or equal to 45°. At an angle of incidence lower than or equal to 45°, for wavelengths ranging from 700 nm to the predetermined maximum wavelength, the mean reflectance of the front interferential coating is either lower than or equal to 2.5% if the source is directed towards the front face of the ophthalmic lens, or higher than or equal to 25% if the source is directed towards the rear face of the ophthalmic lens. ## Claims ### Claim 1 An optical device comprising: an ophthalmic lens and a light source emitting in a deep red and near infrared region, said ophthalmic lens having a front face coated with a front interferential coating and a rear face coated with a rear interferential coating, wherein a mean reflectance of said rear interferential coating is lower than or equal to 2.5% for wavelengths ranging from 700 nm to a predetermined maximum wavelength lower than or equal to 2500 nm, at an angle of incidence lower than or equal to 45°; and the mean reflectance of said front interferential coating is either: lower than or equal to 2.5% for wavelengths ranging from 700 nm to said predetermined maximum wavelength, at an angle of incidence lower than or equal to 45°, if said source is directed towards said front face of said ophthalmic lens, or higher than or equal to 25% for wavelengths ranging from 700 nm to said predetermined maximum wavelength, at an angle of incidence lower than or equal to 45°, if said source is directed towards said rear face of said ophthalmic lens. ### Claim 2 (depends on 1) The optical device according to claim 1, wherein said predetermined maximum wavelength is 2500 nm. ### Claim 3 (depends on 1) The optical device according to claim 1, wherein said predetermined maximum wavelength is 1400 nm. ### Claim 4 (depends on 1) The optical device according to claim 1, wherein said predetermined maximum wavelength is 980 nm. ### Claim 5 (depends on 1) The optical device according to claim 1, wherein said predetermined maximum wavelength is 900 nm. ### Claim 6 (depends on 1) The optical device according to claim 1, wherein a luminous reflectance Rv of said front and rear interferential coatings is lower than 2.5% in a visible range for wavelengths ranging from 380 nm to 780 nm, at an angle of incidence lower than or equal to 45°. ### Claim 7 (depends on 1) The optical device according to claim 1 wherein (i) said rear interferential coating or (ii) said front interferential coating if said source is directed towards said front face of said ophthalmic lens, comprises at least four layers, each layer having a refractive index either lower than the refractive index of all the adjacent layers, or higher than the refractive index of all the adjacent layers. ### Claim 8 (depends on 7) The optical device according to claim 7, wherein said lens comprises a substrate and in that (i) said rear interferential coating or (ii) said front interferential coating if said source is directed towards said front face of said ophthalmic lens, comprises at least, in the direction moving away from said substrate: one layer having a refractive index ranging from 1.6 to 2.4; one layer having a refractive index lower than 1.6; one layer having a refractive index ranging from 1.6 to 2.4; and one layer having a refractive index lower than 1.6. ### Claim 9 (depends on 7) The optical device according to claim 7, wherein said lens comprises a substrate and in that (i) said rear interferential coating or (ii) said front interferential coating if said source is directed towards said front face of said ophthalmic lens, comprises at least, in the direction moving away from said substrate: one layer having a physical thickness ranging from 10 to 25 nm; one layer having a physical thickness ranging from 20 to 35 nm; one layer having a physical thickness ranging from 140 to 180 nm; and one layer having a physical thickness ranging from 90 to 120 nm. ### Claim 10 (depends on 1) The optical device according to claim 1, wherein a physical thickness of (i) said rear interferential coating or (ii) said front interferential coating if said source is directed towards said front face of said ophthalmic lens, is lower than or equal to 500 nm. ### Claim 11 (depends on 8) The optical device according to claim 8, wherein said layers having a refractive index ranging from 1.6 to 2.4 are made of zirconia (ZrO2) and said layers having a refractive index lower than 1.6 are made of silicon dioxide (SiO2). ### Claim 12 (depends on 1) The optical device according to claim 1, wherein said ophthalmic lens is a corrective lens. ### Claim 13 (depends on 1) An augmented reality device comprising the optical device according to claim 1. ### Claim 14 (depends on 1) A virtual reality device comprising the optical device according to claim 1. ### Claim 15 (depends on 1) An eye tracking device comprising the optical device according to claim 1. ### Claim 16 (depends on 1) The optical device according to claim 1, wherein the luminous reflectance Rv of said front and rear interferential coatings is lower than 1% in the visible range for wavelengths ranging from 380 nm to 780 nm, at an angle of incidence lower than or equal to 45°. ### Claim 17 (depends on 1) The optical device according to claim 1, wherein the luminous reflectance Rv of said front and rear interferential coatings is lower than 0.75% in the visible range for wavelengths ranging from 380 nm to 780 nm, at an angle of incidence lower than or equal to 45°. ### Claim 18 (depends on 1) The optical device according to claim 1, wherein a physical thickness of (i) said rear interferential coating or (ii) said front interferential coating if said source is directed towards said front face of said ophthalmic lens, is lower than or equal to 320 nm. ### Claim 19 (depends on 1) The optical device according to claim 1, wherein a physical thickness of (i) said rear interferential coating or (ii) said front interferential coating if said source is directed towards said front face of said ophthalmic lens, is ranging from 260 to 320 nm.