Patent · US Expired

Low beam or fog headlamp for motor vehicles

US5014173A · kind A · utility

9Cited by

6References

2Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Gerhard Lindae · Leonberg, DE
Richard Loewe · Gerlingen, DE
Peter Perthus · Stuttgart, DE

Key dates

Filing date	Aug 23, 1988
Grant date	May 7, 1991
Priority date	—
Expiry date	Aug 23, 2008

Classification

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

Abstract

A low beam headlamp for motor vehicles includes an objective made of pressed glass whose one side is formed as aspheric partial surfaces of identical or different aspherity. The partial surfaces are staggered in the direction parallel to the optical axis of the objective and the resulting step has rounded edges. The aspheric partial surfaces adjust light distribution to achieve a desired quality of the light-dark boundary zone projected on the driveway, and provide corrected color fringes of the passing light beam.

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