Optical light weight glass with a refractive index of >1.70, an Abbe index of >22 and a density of <3.5 G/CM.sup.3

US4526874A · kind A · utility

Assignee

• Schott Glaswerke · DE

Inventors

• Danuta Grabowski geb. Marszalek · Wiesbaden, DE
• Ludwig Ross · Klein-Winternheim, DE
• Volkmar Geiler · Ingelheim am Rhein, DE
• Karl Mennemann · Taunusstein, DE

Key dates

• Filing date: Apr 27, 1983
• Grant date: Jul 2, 1985
• Expiry date: Apr 27, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S501/903
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An optical glass with the familiar optical position of n.sub.d >1.70 and v.sub.d >22, which differs from the familiar optical glasses of the optical position due to its lower density and good chemical stability, and is composed of (in percent by weight): SiO.sub.2 25-42, TiO.sub.2 15-35, B.sub.2 O.sub.3 0.5-7, BaO 3-13, CaO 1-3, Nb.sub.2 O.sub.5 1-20, GeO.sub.2 0-2, Al.sub.2 O.sub.3 0-4, Na.sub.2 O 7.5-15, Li.sub.2 O 0-9, K.sub.2 O 2-10, SrO 0-6, ZnO 0-5, ZrO.sub.2 0-3, and WO.sub.3 0-3.