Patent · US Active

Electric incandescent lamp provided with different pitch factors for each end of a filament component

US7456558B2 · kind B2 · utility

2Cited by

4References

2Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Manfred Bühler · Herbrechtingen, DE
Klaus Wittmann · Maurepas, FR

Key dates

Filing date	Aug 2, 2005
Grant date	Nov 25, 2008
Priority date	—
Expiry date	Nov 4, 2026

Classification

Technology area (CPC H)Electricity
CPC primaryH01K9/08
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention relates to an electric incandescent lamp, in particular a vehicle headlight, having at least one incandescent filament which is arranged within a light-permeable lamp vessel, the at least one incandescent filament having different pitch factors at its two ends. In order to increase the luminance at the light/dark boundary of the lower beam, that end of the incandescent filament which is near to the base has a lower pitch factor.

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