Optical glasses and their uses

US6753278B2 · kind B2 · utility

Assignee

• Schott Glas · DE

Inventors

• Silke Wolff · Hückeswagen, DE
• Ute Woelfel · Bingen, DE
• Ulrich Siepe · Wiesbaden, DE

Key dates

• Filing date: May 2, 2002
• Grant date: Jun 22, 2004
• Expiry date: May 2, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C3/155
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The optical glass has an index of refraction (nd) greater than or equal to 1.70, an Abbé number (&ngr;d) greater than or equal to 35 and a density (&rgr;) less than or equal to 4.5 g/cm3. Optical elements made with this optical glass are especially desirable in optical data transfer applications, particularly in read-write devices with movable read-write heads. The glass compositions required to make optical glass with these properties are described.