Patent · US Expired

Xenon short arc discharge lamp

US4937496A · kind A · utility

109Cited by

5References

16Claims

0Family size

Assignee

W. C. Heraeus GmbH · DE

Inventors

Manfred Neiger · Karlsruhe, DE
Reiner Hoppstock · Munich, DE
Bernd Kleiner · Karlsruhe, DE

Key dates

Filing date	Jan 13, 1989
Grant date	Jun 26, 1990
Priority date	—
Expiry date	Jan 13, 2009

Classification

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

Abstract

A xenon short arc discharge lamp has a lamp bulb (1) of quartz glass, into which two rod-shaped electrodes (4, 5) protrude, the spacing of which is shorter than the diameter of the shaft (8) of the cathode (5); the cathode (5) is provided with a conical, obtuse tip (9). By doping with a metal halide, such as thallium iodide, the spectral radiant intensity per unit area in the plasma zone immediately in front of the cathode (5) is increased substantially compared with an undoped xenon short arc discharge lamp, and as a result of a flow-controlled tungsten-halogen cycle process, a stabilized cathode spot operation is attained, and the inner wall of the lamp bulb (1) remains free of tungsten deposits.

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