Patent · US Expired

Motor vehicle headlight with condensing lens and diaphragm

US4517630A · kind A · utility

41Cited by

11References

11Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Rudiger Dieffenbach · Gerlingen, DE
Werner Grunwald · Gerlingen, DE
Peter Perthus · Stuttgart, DE
Friedrich Prinzhausen · Stuttgart, DE

Key dates

Filing date	Nov 30, 1982
Grant date	May 14, 1985
Priority date	—
Expiry date	Nov 30, 2002

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF21S41/275
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The optic axis of a vehicle headlight comprises a reflector, an incandescent helix and a convergent lens. The reflection surface of the reflector is parabolic in the horizontal midplane section and is elliptical in vertical median section. A narrow band of light spreading out laterally is thus produced without supplementary optical components, particularly the diffusion disk or dispersion lens. A sharp light-to-dark boundary is obtained by a diaphragm having an effective straight edge 18 located below the outer ellipse focus, which is coincident with that one of the principal foci of the converging lens which is the nearer to the reflector.

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