Patent · US Expired

Metal-halide discharge lamp for photooptical purposes

US5691601A · kind A · utility

16Cited by

6References

20Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Anna-Maria Frey · Munich, DE
Jürgen Maier · Weitersweiler, DE
Manfred Pilsak · Munich, DE
Ralf Seedorf · Berlin, DE
Clemens Barthelmes · Berlin, DE
Thomas Dittrich · Süderbrarup, DE

Key dates

Filing date	Dec 14, 1995
Grant date	Nov 25, 1997
Priority date	—
Expiry date	Dec 14, 2015

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/827
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A metal-halide discharge lamp for photooptical purposes has a small electe spacing of less than 15 mm, preferably 2-8 mm, to provide an essentially pin-point light source, and a fill which contains AlI.sub.3 in an amount between 0.1 and 4.5 mg/cm.sup.3. Other filling components may in particular be halides of mercury, indium, thallium or cesium; up to 2 mg/cm.sup.3 of AlBr may be added. The lamp is particularly adapted for combination with a, preferably parabolic, reflector.

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