Headlamp, particularly of rectangular configuration, for use as antidazzle lamp on motor vehicles

US4697225A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerhard Lindae · Leonberg, DE
• Peter Perthus · Stuttgart, DE
• Heinz Rein · Reutlingen, DE

Key dates

• Filing date: Jul 29, 1986
• Grant date: Sep 29, 1987
• Expiry date: Jul 29, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F21S41/334
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A low beam headlamp includes a reflector defining an optical axis and an incandescent filament forming a cylindrical coil whose central axis extends in a horizontal plane through the focal point and forms right angles with the optical axis. The light reflecting surface of the reflector is divided into six zones of which two lateral zones when viewed in the direction of the optical axis form together a paraboloid sector. The upper left hand wall portion and a lower right hand wall portion form together a second paraboloid sector whose central axis is inclined upwards relative to a central axis of the first paraboloid sector. An upper right hand wall portion and a lower left hand wall portion form together a composite paraboloid-ellipsoid sector whose sections taken in parallel vertical planes form parts of parabolas whereas sections taken in parallel horizontal planes form parts of ellipses. The projection of the resulting partial light beams provides a partially overlapping spot of concentrated light and two lateral flat partial beams.