OPTICAL ARTICLE HAVING A RED RESIDUAL REFLECTION COLOUR
The present invention relates to a transparent article comprising a substrate comprising at least one front face and one back face, at least one of these two main faces being coated with an interference coating having a reflection value in the visible R v lower than or equal to 97% and preferably lower than or equal to 50%, characterized in that said interference coating possesses a hue angle h and a chroma value C* able to render the present residual reflection a given perceived chromatic colour in the red.
1 - 15 . (canceled)
16 . A transparent article comprising a substrate comprising at least one front face and one back face, at least one of these two main faces being coated with an interference coating having a residual reflection and having a reflectance in the visible R v lower than or equal to 97%, wherein said interference coating possesses a hue angle h and a chroma C* that are able to give the residual reflection a given chromatic color perceived in the red.
17 . The article as claimed in claim 16 , wherein the hue angle h ranges from 0° to 40° and the chroma C* is higher than or equal to 20.
18 . The article as claimed in claim 17 , wherein the chroma C* is lower than or equal to 50.
19 . The article as claimed in claim 18 , wherein the chroma C* is higher than or equal to 30.
20 . The article as claimed in claim 18 , wherein the chroma C* is strictly higher than 30.
21 . The article as claimed in claim 16 or 17 , wherein the hue angle ranges from 5° to 40°.
22 . The article as claimed in claim 21 , wherein the hue angle ranges from 5° to 35°.
23 . The article as claimed claim 16 or 17 , wherein the reflectance in the visible R v ≦30%.
24 . The article as claimed in claim 23 , wherein the reflectance in the visible R v ≦10%.
25 . The article as claimed in claim 16 or 17 , wherein the interference coating is an antireflection (AR) coating and has a reflectance R v <2.5%.
26 . The article as claimed in claim 16 or 17 , wherein the interference coating comprises a stack of alternated layers of high refractive index higher than or equal to 1.50, and of low refractive index lower than 1.50.
27 . The article as claimed in claim 26 , wherein the one or more low index layers consist of SiO 2 and the one or more high refractive index layers consist of ZrO 2 .
28 . The article as claimed in claim 26 , wherein the interference coating comprises a stack from the substrate of at least four layers having the following physical thicknesses:
from 100 to 120 nm for the high refractive index layer;
from 110 to 140 nm for the low refractive index layer;
from 75 to 95 nm for the high refractive index layer; and
from 55 to 77 nm for the low refractive index layer.
29 . The article as claimed in claim 16 or 17 , wherein at least one of the two main faces of the substrate is already coated with one or more functional coatings chosen from: a primer layer for adhesion and/or shock resistance, an abrasion resistant coating, and/or a polarization coating, a photochromic coating.
30 . The article as claimed in claim 16 or 17 , wherein the interference coating is coated with an anti-smudge coating.
31 . The article as claimed in claim 16 or 17 , wherein the interference coating is placed only on the front face of the article.
32 . The article as claimed in claim 31 , wherein the interference coating is placed on the front face and on the back face of the article.
33 . The article as claimed in claim 16 or 17 , wherein the article is an optical article.
34 . The article as claimed in claim 33 , wherein the article is an ophthalmic lens.
35 . The article as claimed in claim 16 or 17 , wherein said interference coating has a reflectance in the visible R v lower than or equal to 50%.