# US 12,111,521 B2 · Optical lens having an interferential coating and a multilayer system for improving abrasion-resistance

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- Number: US 12,111,521 B2
- Document ID: US12111521B2
- Status: Granted
- Kind: B2
- Application number: 17/293,205
- Filed: 2019-11-18
- Published: 2022-01-13
- Granted: 2024-10-08
- Earliest claimed: 2018-11-19
- Assignees: Essilor International
- Applicants: Essilor International
- Inventors: Christophe Valenti; Frédéric Guillain; William Trottier-Lapointe; Xingzhao Ding
- Web page: https://patentgrep.com/patent/US12111521B2

## CPC

- G02B 1/115: Multilayers
- G02C 7/107: {Interference colour filters}
- G02B 5/28: Interference filters
- G02C 7/022: {Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence)}
- G02B 1/116: including electrically conducting layers
- 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

The invention relates to 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 a first high refractive index sheet which does not comprise any Ta2O5 layer, a second low refractive index sheet a third high refractive index sheet, a monolayer sub-layer having a thickness higher than or equal to 100 nm, and a multilayer interferential coating comprising a stack of at least one high refractive index layer and at least one low refractive index layer. The mean reflection factor RUV on 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°.

## Claims

### Claim 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 Ta2O5 layer;
(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 RUV on 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°.

### Claim 2 (depends on 1)

The optical lens of claim 1, wherein the sub-layer has a thickness higher than or equal to 120 nm.

### Claim 3 (depends on 1)

The optical lens of claim 1, wherein the deposition of said sub-layer is performed in a vacuum chamber in which no supplementary gas is supplied during said deposition.

### Claim 4 (depends on 1)

The optical lens of claim 1, wherein the sub-layer is a SiO2-based layer.

### Claim 5 (depends on 1)

The optical lens of claim 1, wherein the interferential coating comprises at least one Ta2O5-based layer.

### Claim 6 (depends on 1)

The optical lens of claim 1, wherein the interferential coating is an anti-reflection coating.

### Claim 7 (depends on 1)

The optical lens of claim 1, wherein the optical lens is an ophthalmic lens.

### Claim 8 (depends on 1)

The optical lens of claim 1, wherein the first high refractive index sheet (A) having a refractive index higher than 1.55 is a ZrO2-based layer.

### Claim 9 (depends on 1)

The optical lens of claim 1, wherein the second low refractive index sheet (B) having a refractive index of 1.55 or less is a SiO2-based layer.

### Claim 10 (depends on 1)

The optical lens of claim 1, wherein the third high refractive index sheet (C) having a refractive index higher than 1.55 comprises at least one material selected from Ta2O5, Nb2O5, PrTiO3, ZrO2 and Y2O3.

### Claim 11 (depends on 1)

The optical lens of claim 1, wherein the ratio:
R
T
⁢
1
=
sum
⁢
of
⁢
the
⁢
physical
⁢
thicknesses
⁢
of
⁢
the
⁢
low
⁢
refractive
⁢
index
layers
⁢
of
⁢
the
⁢
interferential
⁢
coating
sum
⁢
of
⁢
the
⁢
physical
⁢
thicknesses
⁢
of
⁢
the
⁢
high
⁢
refractive
⁢
index
layers
⁢
of
⁢
the
⁢
interferential
⁢
coating
is higher than or equal to 1.5.

### Claim 12 (depends on 1)

The optical lens of claim 1, wherein the thickness of said second low refractive index sheet (B) having a refractive index of 1.55 or less is lower than or equal to 80 nm.

### Claim 13 (depends on 1)

The optical lens of claim 1, wherein the thickness of said second low refractive index sheet (B) having a refractive index of 1.55 or less is lower than or equal to 60 nm.

### Claim 14 (depends on 1)

The optical lens of claim 1, wherein the first high refractive index sheet (A) having a refractive index higher than 1.55 and the third high refractive index sheet (C) having a refractive index higher than 1.55 have a thickness lower than or equal to 60 nm.

### Claim 15 (depends on 1)

The optical lens of claim 1, wherein the first high refractive index sheet (A) having a refractive index higher than 1.55 and the third high refractive index sheet (C) having a refractive index higher than 1.55 have a thickness lower than or equal to 25 nm.

### Claim 16 (depends on 1)

A method of manufacturing the optical lens of claim 1, comprising:
providing an optical lens comprising a substrate having a front main face and a rear main face;
depositing onto at least one main face of the substrate, in this order, an abrasion and/or scratch resistant coating, a first high refractive index sheet (A) having a refractive index higher than 1.55, which does not comprise any Ta2O5 layer, a second low refractive index sheet (B) having a refractive index of 1.55 or less so that it is in direct contact with the former sheet (A), a third high refractive index sheet (C) having a refractive index higher than 1.55 so that it is in direct contact with the former sheet (B), a monolayer sub-layer having a thickness higher than or equal to 100 nm so that it is in direct contact with the former sheet (C), and 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 mean reflection factor RUV on 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°.

### Claim 17 (depends on 1)

The optical lens of claim 1, wherein the mean reflection factor RUV on 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 5%, for an angle of incidence of 35°.

### Claim 18 (depends on 1)

The optical lens of claim 1, wherein the mean reflection factor RUV on 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 4.5%, for an angle of incidence of 35°.

### Claim 19 (depends on 1)

The optical lens of claim 1, wherein said abrasion and/or scratch resistant coating has a thickness ranging from 2 μm to 10 μm.

### Claim 20 (depends on 1)

The optical lens of claim 1, wherein said at least one main face of the substrate which is successively coated is the rear face.