Optical glass, optical elements made therefrom, method of making the optical elements from the glass, and optical components comprising one or more optical elements

US8404606B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Silke Wolff · Hückeswagen, DE
• Karl Mennemann · Taunusstein, DE
• Uwe Kolberg · Mainz, DE
• Ute Woelfel · Bingen, DE
• Thomas Lifka · Bad Kreuznach, DE

Key dates

• Filing date: Feb 24, 2010
• Grant date: Mar 26, 2013
• Expiry date: Dec 22, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C3/068
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The lead-free and arsenic-free optical glasses have a refractive index of 1.83≦nd≦1.95 and an Abbé number of 24≦νd≦35, good chemical resistance, excellent crystallization stability and a composition, in wt. % based on oxide content, of SiO2, 2-8; B2O3, 15-22; La2O3, 35-42; ZnO, 10-18; TiO2, 9-15; ZrO2, 3-10; Nb2O5, 4-10; and WO3, >0.5-3. Besides containing at most 5 wt. % of each of GeO2, Ag2O and BaO and conventional fining agents, they may also contain at most in total 5 wt. % of Al2O3, MgO, CaO, SrO, P2O5 and up to at most in total 5 wt. % of the components F, Ta2O5. The glasses are preferably free of alkali metal oxides, Bi2O3, Y2O3, Gd2O3 and/or Yb2O3. Optical elements made from the optical glass are also described.