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Transparent substrate comprising an antiglare coating

  • US 6,924,037 B1
  • Filed: 11/17/2000
  • Issued: 08/02/2005
  • Est. Priority Date: 11/17/1999
  • Status: Expired due to Term
First Claim
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1. A manufactured article, comprising:

  • a transparent substrate;

    an antireflection coating on at least one face of the transparent substrate, said antireflection coating made of a stack of thin layers of dielectric material having alternately high and low refractive indices, wherein the stack comprises, in succession;

    a high-index first layer, having a refractive index n1 of between 1.8 and 2.2 and a geometrical thickness e1 of between 5 and 50 nm;

    a low-index second layer, having a refractive index n2 of between 1.35 and 1.65 and a geometrical thickness e2 of between 5 and 50 nm;

    a high-index third layer, having a refractive index n3 of between 1.8 and 2.2 and a geometrical thickness e3 of between 70 and 120 nm;

    a low-index fourth layer, having a refractive index n4 of between 1.35 and 1.65 and a geometrical thickness e4 of at least 80 μ

    m, wherein the antireflection stack uses, at least for its high-index third layer, silicon nitride or aluminium nitride to undergo a heat treatment of bending, toughening, or annealing.

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