Patent · US Expired

High pressure mercury vapor discharge lamp

US4020377A · kind A · utility

14Cited by

4References

14Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Hanns-Peter Popp · Starnberg, DE
Walter Pilz

Key dates

Filing date	Apr 8, 1976
Grant date	Apr 26, 1977
Priority date	—
Expiry date	Apr 8, 1996

Classification

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

Abstract

An improved high pressure mercury vapor discharge lamp having a high color emperature together with high luminous efficacy and a high color rendering. This is accomplished by including in the filling halides of at least one of the rare-earth metals dysprosium, holmium, thulium, erbium, and terbium; together with the halides of at least one of the alkali or alkaline earth metals; and including a filtering agent for radiation in the blue spectral region. The lamp is preferably of isothermal design. The electrodes preferably contain 1-3% of Dy.sub.2 O.sub.3.

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