US 12,253,652 B2
Lens coating layer having three or more sub-layers of oxide or fluoride
Matteo De Vita, Nerviano (IT)
Assigned to COERENT S.R.L., Parabiago (IT)
Appl. No. 16/961,573
Filed by COERENT S.R.L., Legnano (IT)
PCT Filed Jan. 11, 2019, PCT No. PCT/IB2019/050214
§ 371(c)(1), (2) Date Jul. 10, 2020,
PCT Pub. No. WO2019/138363, PCT Pub. Date Jul. 18, 2019.
Claims priority of application No. 102018000000730 (IT), filed on Jan. 11, 2018.
Prior Publication US 2021/0063611 A1, Mar. 4, 2021
Int. Cl. C09D 1/00 (2006.01); C09D 5/00 (2006.01); G02B 1/115 (2015.01); G02B 1/14 (2015.01)
CPC G02B 1/14 (2015.01) [C09D 1/00 (2013.01); C09D 5/00 (2013.01); C09D 5/006 (2013.01); G02B 1/115 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A lens having a refractive index η1 coated at least partially on at least one surface thereof with an anti-scratch lacquer layer having a refractive index η2 lower than η1, wherein between said lens and said anti-scratch lacquer layer a coating layer comprising at least 3 sub-layers, each of said at least 3 sub-layers consisting of one compound selected from the group consisting of Zirconium oxide, Silicon oxide, Titanium oxide, Tantalum oxide, Iridium oxide, Silver oxide and Magnesium fluoride is present,
wherein each of said at least 3 sub-layers has a thickness lower than or equal to 100 nm and
wherein the coating layer comprising said at least 3 sub-layers is present as a combination of repetition of alternance of a sub-layer of a compound having a refractive index higher than and a sub-layer of a compound having a refractive index lower than the refractive index of the lens.