Collection of ophthalmic lens pairs and ophthalmic lenses having residual reflections exhibiting colors of different intensity
View Patent ↗Each lens of a pair of lenses is provided on at least one of its faces with an antireflection coating having a luminous reflection factor R v that is 2.5% or less, having residual reflections exhibiting the same perceived color, the hue angle (h) for the antireflection coating of one lens varying by not more than 60° as compared to the antireflection coating of the other lens, and: the antireflection coating of one of the lens having an intensely colored residual reflection, a mean reflection factor R m 1 ≧1.20% and a chroma value C* 1 ≧15, the antireflection coating of the second lens having a weakly colored residual reflection, a mean reflection factor R m 2 ≦1.65% and a chroma value C* 2 ≦15, and |R m 1 −R m 2 |≦2.2% and C* 1 −C* 2 >5. The invention can be applied to spectacle glasses.
1. A collection of ophthalmic lens pairs, each lens of which, within said same pair, comprise a substrate having a front face and a rear face and on the front face and/or rear face an antireflection coating having a luminous reflection factor R v that is 2.5% or less, said antireflection coating exhibiting residual reflections having the same perceived chromatic color, the hue angle (h) of the antireflection coating of one paired lens varying by not more than 60° as compared to the hue angle h of the antireflection coating of the other paired lens and:
a) the antireflection coating of the first paired lens having a residual reflection exhibiting a high intensity color with:
a mean reflection factor R m 1 that is 1.20% or more; and
a chroma value C* 1 of 15 or more;
b) the antireflection coating of the second paired lens having a residual reflection exhibiting a low intensity color with:
a mean reflection factor R m 2 that is 1.65% or less; and
a chroma value C* 2 of 15 or less;
c) the mean reflection factors for the antireflection coatings satisfy the relation |R m 1 −R m 2 |≦2.2%; and
d) C* 1 −C* 2 >5.
2. The collection of claim 1 , wherein the luminous reflection factor R v is 2% or less.
3. The collection of claim 1 , wherein the hue angle (h) of the antireflection coating of one paired lens varies by not more than 45° as compared to the hue angle h of the antireflection coating of the other paired lens.
4. The collection of claim 1 , wherein R m 1 is 1.20% or more.
5. The collection of claim 4 , wherein R m 1 is 1.30% or more.
6. The collection of claim 5 , wherein R m 1 is 1.35% or more.
7. The collection of claim 6 , wherein R m 1 is 1.40% or more.
8. The collection of claim 1 , wherein C* 1 is 17 or more.
9. The collection of claim 1 , wherein R m 2 is 1.65% or less.
10. The collection of claim 9 , wherein R m 2 is 1.60% or less.
11. The collection of claim 10 , wherein R m 2 is 1.50% or less.
12. The collection of claim 1 , wherein C* 2 is 14 or less.
13. The collection of claim 12 , wherein C* 2 is 12 or less.
14. The collection of claim 13 , wherein C* 2 is 10 or less.
15. The collection of claim 1 , wherein |Rm 1 −Rm 2 |≦2%.
16. The collection of claim 15 , wherein |Rm 1 −Rm 2 |≦1.8%.
17. The collection of claim 16 , wherein |Rm 1 −Rm 2 |≦1.5%.
18. The collection of claim 17 , wherein |Rm 1 −Rm 2 |≦1.3%.
19. The collection of claim 1 , wherein C* 1 −C* 2 >6.
20. The collection of claim 19 , wherein C* 1 −C* 2 >6.5.
21. The collection of claim 20 , wherein C* 1 −C* 2 is >25.
22. The collection of claim 1 , wherein for a hue angle (h) ranging from 220° to 300° or for a hue angle (h) ranging from 310° to 30°, the luminous reflection factor R v 1 for the antireflection coating having a residual reflection exhibiting a high intensity color is lower than the luminous reflection factor R v 2 for the antireflection coating having a residual reflection exhibiting low intensity color.
23. The collection of claim 1 , further defined as comprising at least 3 pairs of lenses further defined as:
a first pair of lenses having a residual reflection which perceived chromatic color is yellow and which hue angle (h) ranges from 40° to 100°;
a second pair of lenses having a residual reflection which perceived chromatic color is blue and which hue angle (h) ranges from 220° to 300°; and
a third pair of lenses having a residual reflection which perceived chromatic color is pink and which hue angle (h) ranges from 310° to 30°.
24. The collection of claim 23 , wherein the first pair of lenses has a hue angle (h) ranging from 40° to 90°.
25. The collection of claim 23 , wherein the second pair of lenses has a hue angle (h) ranging from 220° to 280°.
26. The collection of claim 1 , wherein the antireflection coatings comprise an alternated stack of layers of high refractive index dielectric materials (n D 25 ≧1.50) and low refractive index dielectric materials (n D 25 <1.50).
27. The collection of claim 26 , wherein the material for the high refractive index layer is ZrO 2 and the material for the low refractive index layer is SiO 2 .
28. The collection of claim 26 , wherein the antireflection coatings comprise the same number of layers.
29. The collection of claim 28 , wherein the antireflection coatings comprise 4 layers.
30. The collection of claim 26 , wherein the ratio (total physical thickness of the low refractive index layers)/(total physical thickness of the high refractive index layers) is from 0.6 to 1.2.
31. The collection of claim 1 , wherein the substrate comprises an antireflection coating on both front and rear faces.
32. The collection of claim 1 , further defined as comprised in a display pack.
33. A display pack for a collection of ophthalmic lens pairs comprising at least one pair of lenses according to claim 1 comprising a carrier on which the lenses belonging to the pair are placed side by side as a row or as a column.
34. The display pack of claim 33 , wherein the collection of ophthalmic lens pairs comprises at least 3 pairs of lenses, a first pair with a yellow residual reflection color, a second pair with a blue residual reflection color and a third pair with a pink residual reflection color.
35. An ophthalmic lens comprising a transparent and at least partly tinted substrate comprising a front face and a rear face, wherein:
the front face of the substrate comprises a first antireflection coating having a luminous reflection factor R v 1 ≦2.5%, a residual reflection exhibiting a perceived chromatic color of high intensity, a mean reflection factor satisfying the relation 2.5%≧R m 1 ≧1.20, and a chroma value C* 1 ≧15;
the rear face of the substrate comprises a second antireflection coating having a luminous reflection factor R v 2 <2.5%, a residual reflection exhibiting a perceived chromatic color of low intensity, a mean reflection factor R m 2 lower than the mean reflection factor R m 1 for the first antireflection coating, and a chroma value C* 2 ≦15;
the mean reflection factors R m 1 and R m 2 for the first and second antireflection coatings satisfying the relation |R m 1 −R m 2 |≦2.20%; and
the chroma values C* 1 and C* 2 for the first and second antireflection coatings satisfying the relation C* 1 −C* 2 <5.
36. A collection of ophthalmic lens pairs comprising an ophthalmic lens of claim 35 .
37. The collection of claim 36 , further defined as comprised in a display pack.