Lead-free and preferably arsenic-free dense optical crown glass

US7141524B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Silke Wolff · Hückeswagen, DE
• Ute Woelfel · Bingen, DE

Key dates

• Filing date: Aug 19, 2003
• Grant date: Nov 28, 2006
• Expiry date: Jul 11, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C3/16
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The lead-free, Li2O-free, CuO-free and preferably arsenic-free optical glass is suitable for applications in the fields of imaging, projection, telecommunications, optical communication technology and/or laser technology, and has a refractive index nd of 1.55≦nd≦1.60, an Abbe number Vd of 54≦Vd≦63 and a transformation temperature Tg≦500° C. This optical glass has good production and processing properties and crystallization stability, and, at the same time, advantageously does not contain PbO and As2O3. These glasses contain, in percent by weight based on oxide content: P205, 43-56; ZnQ, 21-36; Al2O3, 0-6; Na2O, 0-16; K2O, 0-8; ΣM2O ≦16; MgO, 0-5; CaO, 0-5; BaO, 3-14; B2O3, 0-8; La2O3, 0-7. In addition, it may also contain standard refining agents.