Patent · US Expired

Method to operate a high-pressure discharge lamp suitable for horizontal arc position

US5436533A · kind A · utility

17Cited by

4References

9Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Dietrich Fromm · Holzkirchen, DE
Juergen Seehawer · Munich, DE
Franz Bernitz · Unterhaching, DE

Key dates

Filing date	May 20, 1994
Grant date	Jul 25, 1995
Priority date	—
Expiry date	May 20, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/00
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

To prevent bowing of the arc of a high-pressure discharge lamp operated horizontally, the lamp is supplied with alternating current of between 10 kHz and 100 kHz, in which the frequency and wave shape of the alternating current portions of the supply are so selected that standing radial acoustic resonances will be formed within the discharge medium or fill in the discharge vessel, which standing radially directed acoustic resonances suppress or counteract bending of the discharge arc due to convection phenomena.

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