Patent · US Active

Process for producing an electrode for high-pressure discharge lamps, and an electrode and a high-pressure discharge lamp with such electrodes

US7528549B2 · kind B2 · utility

1Cited by

2References

9Claims

0Family size

Assignee

OSRAM Gesellschaft mit beschraenkter Haftung · DE

Inventors

Jürgen Almanstötter · Hiltenfingen, DE
Dirk Grundmann · Berlin, DE
Klaus Gunther · Voerde, DE
Thomas Hartmann · Friedland, DE

Key dates

Filing date	Aug 24, 2005
Grant date	May 5, 2009
Priority date	—
Expiry date	Feb 14, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/0735
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A process for producing an electrode for high-pressure discharge lamps, at least the discharge-side section of the electrode being produced from a prefabricated tungsten wire, which is shortened to the required length during the production process of the electrode and subjected to an annealing process as well as being mounted on other components of the electrode that may be present. The annealing process is carried out exclusively at temperatures below 1500 degrees Celsius. The invention also relates to an electrode for high-pressure discharge lamps, at least the discharge-side section of the electrode being constructed as a tungsten rod that has a long crystalline structure or an isotropic crystalline structure with grain diameters in the radial direction of the tungsten rod of less than or equal to 50 micrometers with the centroid of the grain size distribution in the range from 10 micrometers to 20 micrometers.

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