Patent · US Expired

High-pressure gas discharge lamp, and method of manufacturing same

US6552499B2 · kind B2 · utility

6Cited by

6References

13Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Guenther Hans Derra · Aachen, DE
Hanns E. Fischer · Stolberg, DE
Dieter Leers · Stolberg, DE
Holger Moench · Vaals, NL

Key dates

Filing date	Dec 10, 2001
Grant date	Apr 22, 2003
Priority date	—
Expiry date	Dec 10, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/82
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A high-pressure gas discharge lamp (HID or UHP lamp, or in general lamps with mercury fillings of between approximately 0.05 and 0.5 mg/mm3) is described with at least one electrode (7, 8) which is provided with a thickened, for example globular portion (9, 10) at its end lying inside a lamp vessel (2). This portion is so dimensioned in dependence on operational parameters of the lamp and/or the diameter of the electrode rod that an electrode tip (19) forms itself independently at said portion during the first hours of operation. This tip grows from the portion until its free end starts melting. The electrode tip is self-adjusting in this manner, so that an optimum electrode interspacing is maintained throughout lamp life. Furthermore, a method of manufacturing such a lamp is described.

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