We Claim:
1. A coating (100a) for an optical lens (100), the coating (100a) comprising:
a hard coat layer (102) deposited on a surface of a base lens (101) of the optical lens
(100);
a nano filter grid layer (103) deposited on the hard coat layer (102); and
a plurality of layers (1-9) of a high refractive index material and a low refractive index
material deposited alternatively on the nano filter grid layer (103),
wherein, the nano filter grid layer (103) comprises a grid of holes (103a) deposited on the hard
coat layer by plasma etching.
2. The coating (100a) as claimed in claim 1, wherein each hole (103a) of the nano filter grid
layer (103) has a diameter of 1mm.
3. The coating (100a) as claimed in claim 1, wherein each hole (103a) of the nano filter grid
layer (103) is a through hole.
4. The coating (100a) as claimed in claim 1, wherein a wall thickness between each hole (103a)
of the nano filter grid layer (103) is 2mm.
5. The coating (100a) as claimed in claim 1, wherein the high refractive index material is at
least one of oxides of tantalum and oxides of indium tin.
6. The coating (100a) as claimed in claim 1, wherein a refractive index of the high refractive
index material is more than or equal to 2.0.
7. The coating (100a) as claimed in claim 1, wherein the low refractive index material is at
least one of oxides of silicon.
8. The coating (100a) as claimed in claim 1, wherein the refractive index of the low refractive
index material is less than or equal to 1.5.
9. The coating (100a) as claimed in claim 1, wherein each of the high refractive index material
and the low refractive index material is ion-assisted.
10. The coating (100a) as claimed in claim 1, wherein the plurality of layers (1-9) comprises:
a first layer (1) of the low refractive index material, and thickness of the first layer is
17.21 nm;
a second layer (2) of high refractive index material deposited over the first layer (1),
and thickness of the second layer is 4.27 nm;
a third layer (3) of the low refractive index material deposited over the second layer
(2), and thickness of the third layer is 93.52 nm;
a fourth layer (4) of low refractive index material deposited over the third layer (3), and
thickness of the fourth layer is 127.97 nm;
a fifth layer (5) of high refractive index material deposited over the fourth layer (4), and
thickness of the fifth layer is 28.3 nm;
a sixth layer (6) of low refractive index material deposited over the fifth layer (5), and
thickness of the sixth layer is 30.58 nm;
a seventh layer (7) of high refractive index material deposited over the sixth layer (6),
and thickness of the seventh layer is 50.23 nm;
an eighth layer (8) of high refractive index deposited over the seventh layer (7), material
and thickness of the eight layers is 6.12 nm; and
a ninth layer (9) of low refractive index material deposited over the eighth layer (8),
and thickness of the ninth layer is 95.13 nm.
11. The coating (100a) as claimed in claim 10, wherein the eighth layer (8) is an intermittent
layer made of oxides of indium tin.
12. The coating (100a) as claimed in claim 1-11, wherein at least one ion etched layer (10) is
deposited over the nano filter grid layer (103), the fifth layer (5), and the ninth layer (9).
13. The coating (100a) as claimed in claim 12, wherein a layer of oleophobic material (11)
deposited over the at least one ion etched layer (10), and thickness of the layer of oleophobic
material (11) is 25 nm deposited on the optical lens (100).
14. The coating (100a) as claimed in claim 13, wherein a layer of grip coating (12) is deposited
on the oleophobic layer (11) of the optical lens (100), thickness of the grip coating (12) ranges
between 5 nm to 15 nm.
15. The coating (100a) as claimed in claim 1, wherein the hard coat layer (102) is made of an
anti-scratch lacquer.
16. The coating (100a) as claimed in claim 1, wherein the plurality of layers (1 to 9) is deposited
on the optical lens (100) by means of at least one of physical vapor deposition (PVD) or
chemical vapor deposition (CVD).
17. The coating (100a) as claimed in claim 1, wherein the thickness of the coating (100a) may
range from 470-720 nm for at least one surface of the optical lens (100).
18. An optical article, comprising:
an optical lens (100);
a coating (100a) for the optical lens (100), the coating (100a) comprising:
a hard coat layer (102) deposited on a surface of a base lens (101) of the optical
lens (100);
a nano filter grid layer (103) deposited on the hard coat layer (102);
a plurality of layers (1-9) of a high refractive index material and a low refractive
index material deposited alternatively on the nano filter grid layer (103), wherein the
plurality of layers (1-9) comprises:
a first layer (1) of the low refractive index material, and thickness of the
first layer is 17.21 nm;
a second layer (2) of high refractive index material deposited over the
first layer (1), and thickness of the second layer is 4.27 nm;
a third layer (3) of the low refractive index material deposited over the
second layer (2), and thickness of the third layer is 93.52 nm;
a fourth layer (4) of low refractive index material deposited over the
third layer (3), and thickness of the fourth layer is 127.97 nm;
a fifth layer (5) of high refractive index material deposited over the
fourth layer (4), and thickness of the fifth layer is 28.3 nm;
a sixth layer (6) of low refractive index material deposited over the fifth
layer (5), and thickness of the sixth layer is 30.58 nm;
a seventh layer (7) of high refractive index material deposited over the
sixth layer (6), and thickness of the seventh layer is 50.23 nm;
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an eighth layer (8) of high refractive index deposited over the seventh
layer (7), material and thickness of the eight layers is 6.12 nm;
a ninth layer (9) of low refractive index material deposited over the
eighth layer (8), and thickness of the ninth layer is 95.13 nm;
at least one ion etched layer (10) deposited over the nano filter grid layer (103),
the fifth layer (5), and the ninth layer (9);
a layer of oleophobic material (11) deposited over the at least one ion etched layer (10),
and thickness of the layer of oleophobic material (11) is 25 nm; and
a layer of grip coating (12) is deposited on the oleophobic layer (11) of the optical lens
(100), thickness of the grip coating (12) ranges between 5nm to 15nm,
wherein, the nano filter grid layer (103) comprises a grid of holes (103a) deposited on
the hard coat layer by plasma etching.
19. The optical article as claimed in claim 18, wherein the each hole (103a) of the nano filter
grid layer (103) has a diameter of 1 mm.
20. The optical article as claimed in claim 18, wherein each hole (103a) of the nano filter grid
layer (103) is a through hole.
21. The optical article as claimed in claim 18, wherein a wall thickness between each hole
(103a) of the nano filter grid layer (103) is 2 mm.
22. The optical article as claimed in claim 18, wherein the low refractive index material is at
least one of oxides of silicon and the refractive index of the low refractive index material is
less than or equal to 1.5.
23. The optical article as claimed in claim 18, wherein the high refractive index material is at
least one of oxides of tantalum and oxides of indium tin and the refractive index of the high
refractive index material is more than or equal to 2.0.
24. The optical article as claimed in claim 18, wherein the eighth layer (8) is an intermittent
layer made of oxides of indium tin.
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25. The optical article as claimed in claim 18, wherein the plurality of layers (1 to 9) is
deposited on the optical lens (100) by means of at least one of physical vapor deposition (PVD)
or chemical vapor deposition (CVD).
26. The optical article as claimed in claim 18, wherein the thickness of the coating (100a) may
range from 470-720nm for at least one surface of the optical lens (100).