Titanium dioxide containing glasses having a high index of refraction and a high dispersion and process of producing same

US3960579A · kind A · utility

Assignee

• Ernst Leitz GmbH, Optische Werke

Inventors

• Heinz Broemer · Wetzlar, DE
• Norbert Meinert · Witzenhausen, DE
• Johann Spincic

Key dates

• Filing date: Apr 9, 1975
• Grant date: Jun 1, 1976
• Expiry date: Apr 9, 1995

Classification

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

Abstract

Optical silicate glasses containing titanium dioxide and having a high index of refraction and high dispersion are composed of PA1 1 % to 10 %, by weight, of silicon dioxide SiO.sub.2, PA1 30 % to 50 %, by weight, of barium oxide BaO, PA1 18 % to 24 %, by weight, aluminum oxide Al.sub.2 O.sub.3, and PA1 21 % to 30 %, by weight, of titanium dioxide TiO.sub.2. In such glasses the barium oxide can be replaced partially by sodium oxide Na.sub.2 O, beryllium oxide BeO, calcium oxide CaO, strontium oxide SrO, cadmium oxide CdO, gadolinium oxide Ga.sub.2 O.sub.3, indium oxide In.sub.2 O.sub.3, or yttrium oxide Y.sub.2 O.sub.3. Likewise, the silicon dioxide therein can be replaced partially by boron trioxide B.sub.2 O.sub.3, lead monoxide PbO, germanium dioxide GeO.sub.2, stannic oxide SnO.sub.2, zirconium oxide ZrO.sub.2, hafnium oxide HfO.sub.2, or thorium oxide ThO.sub.2.