Patent · US Expired

Short arc high-pressure discharge lamp

US7279839B2 · kind B2 · utility

9Cited by

9References

15Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Lars Menzel · Berlin, DE
Dietmar Ehrlichmann · Berlin, DE
Thomas Mehr · Dollnstein, DE
Stephen Berndanner · Ellingen, DE
Wolfgang Spielmann · Ehrwald, AT
Gerhard Leichtfried · Reutte, AT

Key dates

Filing date	Mar 5, 2003
Grant date	Oct 9, 2007
Priority date	—
Expiry date	Mar 13, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/86
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A short arc high-pressure discharge lamp (1) for dc operation, includes a discharge vessel (2) that has two necks (4) diametrically opposite each other, in which an anode (26) and a cathode (7) made of tungsten are melted in a gastight manner, and which has a filling made of at least one noble gas and possibly mercury. According to the invention, at least the material of the cathode tip (11) contains lanthanum oxide La2O3 and at least another oxide from the group consisting of hafnium oxide HfO2 and zirconium oxide ZrO2 in addition to the abovementioned tungsten.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.