Patent · US Expired

Antiglare headlamp particularly a rectangular reflector type headlamp for motor vehicles

US4755919A · kind A · utility

9Cited by

5References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Gerhard Lindae · Leonberg, DE
Rainer Neumann · Krefeld, DE
Peter Perthus · Stuttgart, DE

Key dates

Filing date	Aug 19, 1987
Grant date	Jul 5, 1988
Priority date	—
Expiry date	Aug 19, 2007

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF21S41/336
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The reflection surface of a rectangular reflector for a lower beam headlamp is composed of four sectors delimited by transition lines. Two diametrically opposed left and right sectors (11, 12) form a part of a paraboloid projecting a hot light spot. The diametrically opposed upper and lower sectors (13, 14) are part of a paraboloid-ellipsoid defining a parabola in its vertical center section and an ellipsis in its horizontal center section. The latter sectors project a light spot having a broad light dispersion and an increased front field illumination. The reflected light beam corresponds substantially to a dimmed lower light beam to be projected on the road so that a light dispersing glass of the headlamp does not require any optical means for light beam adjustment.

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