US 12,405,403 B2
Lens with surface microstructures encapsulated by a self-stratified hard coat
John Biteau, Dallas, TX (US)
Assigned to Essilor International, Charenton-le-pont (FR)
Appl. No. 17/920,471
Filed by Essilor International, Charenton-le-pont (FR)
PCT Filed Apr. 22, 2021, PCT No. PCT/EP2021/060478
§ 371(c)(1), (2) Date Oct. 21, 2022,
PCT Pub. No. WO2021/214197, PCT Pub. Date Oct. 28, 2021.
Claims priority of application No. 20305401 (EP), filed on Apr. 23, 2020.
Prior Publication US 2023/0152496 A1, May 18, 2023
Int. Cl. G02B 1/14 (2015.01); G02B 1/113 (2015.01); G02B 1/118 (2015.01); G02B 3/08 (2006.01); G02B 1/16 (2015.01)
CPC G02B 1/14 (2015.01) [G02B 1/113 (2013.01); G02B 1/118 (2013.01); G02B 3/08 (2013.01); G02B 1/16 (2015.01)] 15 Claims
OG exemplary drawing
 
1. An optical article comprising:
a base lens substrate having opposing first and second lens surfaces;
a protective layer having opposing first and second protective surfaces, the first protective surface disposed on the second lens surface; and
at least one or a plurality of optical elements, each:
defining a portion of one of the first protective surface and the second lens surface;
having a maximum height, measured in a direction perpendicular to the second lens surface carrying them, that is less than or equal to 0.1 millimeters (mm) and a diameter that is less than or equal to 2.0 mm;
wherein
the protective layer is composed of:
a self-stratified coating having at least two distinct layers:
a first layer LSSC1 corresponding to the innermost part of the protective layer and having two opposing surfaces, one surface corresponding to first protective surface
and a second layer LSSC2 corresponding to the outermost part of the protective layer and having two opposing surfaces, one surface corresponding to second protective surface
the self-stratified coating resulting from the polymerization of a self-stratifying composition comprising at least two, preferably two incompatible resin compositions, resin composition 1 and resin composition 2;
the first layer LSSC1 being constituted of one of the at least two resin composition, resin composition 1 after curing, cured resin 1, said cured resin 1:
showing a refractive index nSSC1 being lower than the refractive index nm of the at least one or each optical element such that the difference nm−nSSC1 is greater than 0.045, preferably greater than 0.10, or even greater than 0.15;
the second layer LSSC2 being constituted of the other one of the at least two resin compositions, resin composition 2 after curing, said cured resin 2:
showing a refractive index nSSC2 being similar or higher than the index nSSC1.