ANTIREFLECTION-COATED TRANSPARENT SUBSTRATE EXHIBITING NEUTRAL COLOUR

摘要

Transparent especially glass, substrate (6) having at least on one of its sides an antireflection coating made from a stack (A) of thin dielectric layers of alternating high and low refractive indices, characterized in that the stack comprises, in succession: a high-index first film (1) having a refractive index nbetween 1.8 and 2.3 and a geometrical thickness eof between 10 and 25 nm; a low-index second film (2) with a refractive index nof between 1.40 and 1.55 and a geometrical thickness eof between 20 and 50 nm; a high-index third film (3) with a refractive index nof between 1.8 and 2.3 and a geometrical thickness nof between 110 and 150 nm; and a low-index fourth film (4) with a refractive index nof between 1.40 and 1.55 and a geometrical thickness eof between 60 and 95 nm, the algebraic sum of the geometrical thickness e+ ebeing between 125 and 160 nm.