Transparent substrate comprising an antiglare coating

US6924037B1 · kind B1 · utility

Assignee

• SAINT-GOBAIN GLASS FRANCE · FR

Inventors

• Laurent Joret · Paris, FR
• Anne Durandeau · Paris, FR
• Norbert Huhn · Herzogenrath, DE
• Olaf Stahlschmidt · Aachen, DE
• Ulrich Billert · La Celle-Saint-Cloud, FR

Key dates

• Filing date: Nov 17, 2000
• Grant date: Aug 2, 2005
• Expiry date: Dec 23, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2217/734
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A transparent substrate including an antireflection coating, made from a stack of thin layers of dielectric material having alternately high and low refractive indices. This stack includes a high-index first layer having a refractive index n, 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, and 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 nm.