Patent · US Expired

Metal halide gas discharge lamp for projection purposes

US5689154A · kind A · utility

8Cited by

4References

9Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Clemens Barthelmes · Berlin, DE
Thomas Dittrich · Süderbrarup, DE
Ralf Seedorf · Berlin, DE

Key dates

Filing date	May 30, 1996
Grant date	Nov 18, 1997
Priority date	—
Expiry date	May 30, 2016

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/523
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A metal halide gas discharge lamp for projection purposes includes a discge vessel closed at both ends preferably has between the electrodes a central frosted partial area applied on the outer surface of the discharge vessel. The relationship 0.1<B.ltoreq.1, preferably 0.4<B/d<0.8, applies to the quotients of the width B of the frosted partial area by the inter-electrode gap d. The lamp is optionally provided on one or both sides with heat build-up coatings. The lamp advantageously forms a unit with an optical reflector.

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