Optical article with improved visual comfort
AssigneeEssilor International
InventorsXingzhao Ding, Yu Liu
Life of this patent
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Abstract
This optical article has a back face on the side of a wearer's eye, a front face opposite to the back face and, on at least one of the front and back faces, an interferential multilayer coating comprising a stack of at least one layer of high refractive index material having a refractive index higher than 1.55 and at least one layer of low refractive index material having a refractive index of 1.55 or less, the refractive indexes being expressed for a wavelength of 550 nm. The optical article is designed in such a manner that it has high reflective properties for low incident angles when viewing the article from its front or back face and antireflective properties for high incident angles when viewing the article from its front or back face.
Claims12
An optical article having a back face on the side of a wearer's eye, a front face opposite to said back face, wherein said optical article has, on at least one of said front and back faces, an interferential multilayer coating comprising a stack of at least one layer of high refractive index material having a refractive index higher than 1.55 and at least one layer of low refractive index material having a refractive index of 1.55 or less, the refractive indexes being expressed for a wavelength of 550 nm, said optical article being designed in such a manner that it has high reflective properties for low incident angles higher than or equal to 0° and lower than or equal to 15° when viewing said article from its front or back face and antireflective properties for high incident angles higher than or equal to 35° and lower than or equal to 55° when viewing said article from its front or back face,
- the mean visible light reflection factor Rv of said coating for visible light hitting said front or back face being lower than or equal to 2.5% at an angle of incidence with respect to a perpendicular to said front or back face that is higher than or equal to 35° and lower than or equal to 55°;
- and
- the mean visible light reflection factor Rv of said coating for visible light hitting said front or back face being higher than or equal to 2.5% at an angle of incidence with respect to a perpendicular to said front or back face that is higher than or equal to 0° and lower than or equal to 15°.
Dependencies are inferred from the claim text.