Patent · US Expired

Mercury-free metal halide lamp

US6069456A · kind A · utility

50Cited by

10References

25Claims

0Family size

Assignee

OSRAM SYLVANIA Inc. · US

Inventors

Dietrich Fromm · Holzkirchen, DE
Dieter Lang · Kronach, DE
Klaus Stockwald · Munich, DE

Key dates

Filing date	Jul 17, 1998
Grant date	May 30, 2000
Priority date	—
Expiry date	Jul 17, 2018

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/18
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Lighting system, comprising a mercury-free metal halide lamp with a light yield of at least 75 lm/W and a color rendition index of at least 75 and an electronic ballast, the electronic ballast impressing a square-wave power supply on the lamp and keeping the power constant. The filling comprises the following components: PA1 a buffer gas which also acts as starting gas to start the lamp, PA1 a voltage gradient generator, comprising at least one metal halide which vaporizes readily and which is chiefly (by more than 50%) responsible for generating a voltage gradient which corresponds approximately to that of mercury, and PA1 a light generator comprising one metal and/or one metal halide.

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