SiO2-glass bulb with at least one current lead-in, process for producing a gas-tight connection between them, and their use in a gas-discharge lamp

US6525475B2 · kind B2 · utility

Assignee

• W.C. Heraeus GmbH & Co. KG · DE

Inventors

• Friedhold Scholz · Rodenbach, DE
• David Francis Lupton · Gelnhausen, DE
• Jorg Schielke · Bruchköbel, DE
• Holger Zingg · Bad Orb, DE

Key dates

• Filing date: Jul 31, 2001
• Grant date: Feb 25, 2003
• Expiry date: Jul 31, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J5/46
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An SiO2-glass bulb with at least one current lead-in made of a gas-tight composite material, such that the composite material consists of a noble metal with a melting point >1,700° C. and SiO2 and is at least partially coated with a layer of SiO2. The noble metal and the SiO2 are homogeneously distributed in the composite material. The noble metal content of the composite material is ≧10 vol. % to ≦50 vol. %, and the SiO2 coating covers the composite material at least in the region of the connection with the SiO2-glass bulb.