Patent · US Expired

Dual filament halogen cycle incandescent lamp for the use in motor vehicle headlamps, for instance in sealed beam headlamps

US4580199A · kind A · utility

8Cited by

7References

6Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Ewald Wurster · Grünwald, DE
Manfred Gaugel · Fürstenfeldbruck, DE

Key dates

Filing date	Apr 25, 1984
Grant date	Apr 1, 1986
Priority date	—
Expiry date	Apr 25, 2004

Classification

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

Abstract

The filaments for high beam and low beam are in respectively parallel planes, and the axis of the low beam filament forms an angle .alpha. which is less than 90.degree. with the lamp axis, or seal beam headlamp axis, respectively, the angle being suitably between about 30.degree. and 60.degree., and preferably about 45.degree., upon projection of the lamp axis, in parallel, in the plane which includes the axis of the filament. The inclination of the low beam filament facilitates adjustment of the headlamp to provide, reliably, glare-free road illumination in accordance with SAE standards.

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