TRANSPARENT SUBSTRATE COMPRISING AN ANTIREFLECTION COATING

摘要

The invention concerns a transparent substrate (6) comprising on at least one of its surfaces an antireflection coating, in particular with normal incidence consisting of a stack (A) of thin layers, characterized in that the stack comprises successively: a first layer (1) with refractive index n1 ranging between 1.8 and 2.3 and a geometrical thickness e1 ranging between 5 and 50 nm; a second layer (2) with refractive index n2 ranging between 1.35 and 1.65 and geometrical thickness e2 ranging between 5 and 50 nm; a third layer (3) with refractive index n3 ranging between 1.8 and 2.3 and geometrical thickness e3 ranging between 40 and 150 nm; a fourth layer (4) with refractive index n4 ranging between 1.35 and 1.65 and geometrical thickness e4 ranging between 40 and 150 nm.