| 主权项 |
1. Ophthalmic lens having a base of polymeric material with a coating having an interferential multiple layer structure, comprising:
an interphase, orientated towards the base, of a material from the group made up of SiOx, SiO2, Cr, Ni/Cr, SnO2, Al2O3, AlN, ZnO, SiO/Cr, SiOx/Al2O3, ITO, MoO3, with a thickness between 0 and 150 nm, a first high refraction index layer, of a material from the group made up of oxides, nitrides or oxynitrides of Zr, Ti, Sb, In, Sn, Ta, Nb, Hf and mixtures thereof, with a refraction index nD higher than 1.8, a second low refraction index layer, of a material from the group made up of SiO2, MgF2, Al2O3, LaF3 and mixtures thereof, with a refraction index nD lower than 1.65, a third high refraction index layer of a material from the group made up of oxides, nitrides or oxynitrides of Zr, Ti, Sb, In, Sn, Ta, Nb, Hf and mixtures thereof, with a refraction index nD higher than 1.8, a fourth layer, of a material from the group made up of SiO2, MgF2, Al2O3, LaF3 and mixtures thereof, with a refraction index nD lower than 1.8, where between the interphase and the first high refraction index layer there is a first intermediate layer with a refraction index nD lower than 1.8 and with a thickness between 0 and 160 nm, where between the first high refraction index layer and the second low refraction index layer there is a second intermediate layer with a refraction index nD between 1.65 and 1.8 and with a thickness between 0 and 100 nm, where between the second low refraction index layer and the third high refraction index layer there is a third intermediate layer with a refraction index nD between 1.65 and 1.8 and with a thickness between 0 and 110 nm, where a total thickness of said multiple layer structure is at the most 600 nm, measured from a start of the interphase to an end of the fourth layer, and where, if there is none of said intermediate layers, the thickness of said first high refraction index layer is between 91 and 169 nm, preferably between 101 and 159 nm, the thickness of said second low refraction index layer is between 128 and 248 nm, preferably entre 138 and 240 nm, the thickness of said third high refraction index layer is between 73 and 159 nm, preferably between 83 and 147 nm, and the thickness of said fourth layer is between 40 and 138 nm, and, if there is one of said intermediate layers, it holds that: the doublet made up of the first high refraction index layer and the second low refraction index layer that fulfil said thicknesses is replaced by a triplet made up of a first intermediate layer, a first high refraction index layer and a second low refraction index layer such that the thickness of said triplet differs from the thickness of said doublet by less than 5%, and such that the optical thickness of said triplet differs from the optical thickness of said doublet by less than 5%, and/or the doublet made up of the first high refraction index layer and the second low refraction index layer which fulfil said thicknesses is replaced by a triplet made up of a first high refraction index layer, a second intermediate layer and a second low refraction index layer such that the thickness of said triplet differs from the thickness of said doublet by less than 5%, and such that the optical thickness of said triplet differs from the optical thickness of said doublet by less than 5%, and/or the doublet made up of the second low refraction index layer and the third high refraction index layer which fulfil said thicknesses is replaced by a triplet made up of a second low refraction index layer, a third intermediate layer and a third high refraction index layer such that the thickness of said triplet differs from the thickness of said doublet by less than 5%, and such that the optical thickness of said triplet differs from the optical thickness of said doublet by less than 5%. |
