Patent · US Active

Halogen incandescent lamp incorporating two filaments for daylight operation

US8084928B2 · kind B2 · utility

1Cited by

3References

9Claims

0Family size

Assignee

OSRAM GmbH · DE

Inventors

Frank Auer · Herbrechtingen, DE
Gerhard Behr · Riedlingen, DE
Peter Helbig · Sontheim, DE
Christian Seichter · Herbrechtingen, DE
Klaus Wittmann · Maurepas, FR
Sascha Zelt · Beimerstetten, DE

Key dates

Filing date	Nov 8, 2007
Grant date	Dec 27, 2011
Priority date	—
Expiry date	May 19, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH01K1/14
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention relates to a halogen bulb comprising two filaments that are located (21, 22) in a lamp body (10), a first filament (21) being designed for operation at a higher electrical output than the second filament (22). To fulfil a daylight driving function, the second filament (22) is designed to produce an electrical output that is lower by a factor of 2.5 to 4 than the electrical output of the first filament (21) when operating with a standard operating voltage and is designed in such a way that it can be operated with an operating voltage that is lower than the standard operating voltage in order to produce a dimmed position light function.

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