Aluminosilicate glass

US7169470B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Silke Wolff · Hückeswagen, DE
• Ute Woelfel · Bingen, DE
• Uwe Kolberg · Mainz, DE
• Holger Kasprzik · Eltville am Rhein, DE

Key dates

• Filing date: Feb 24, 2004
• Grant date: Jan 30, 2007
• Expiry date: Jun 8, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2933
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A short optical glass is disclosed which does not comprise any silver, copper, thallium, lead or boron and is particularly suited for the application imaging, projection, telecommunication, optical information technology, and/or laser technology, also particularly suited for fiber applications (light guides or imaging guides). Preferably the glass has a refractive index of 1.55≦nd≦1.65 and an Abbe coefficient of 48≦vd≦57 and also has good attenuating and ion exchange characteristics, good chemical stability and good crystallization stability. The glass comprises 35 to <50 wt.-% SiO2; 1 to 10 wt.-% Al2O3; 5 to 15 wt.-% Na2O+K2O+CS2O+Li2O; 20 to 30 wt.-% BaO; 0 to 15 wt.-% ZnO; 0 to 10 wt.-% La2O3; 0 to 10 wt.-% ZrO2; 0 to 6 wt.-% P2O5; 0 to 8 wt.-% MgO+CaO+SrO; 0 to 3 wt.-% of other oxides, and Cs2O<1, Li2O<1, and TiO2<1 wt.-%.