Device for regulating light width of headlights of motor vehicles

Abstract

A device for regulating a light width of headlights of motor vehicles comprises an adjusting device associated with one of the headlights, a transmitter which emits electromagnetic radiation to illuminate a region of a roadway located in front of the motor vehicle, an opto-electronic sensor which determines radiation emitted by the transmitter and reflected by the roadway and in dependence on the detected radiation produces signals, an evaluating device which processes the produced signals and controls the adjusting device for maintaining constant a light width of a beam emitted by the headlights. The transmitter in addition to the light beam of the headlight emits radiation and follows an adjustment of the light width of the light beam emitted by the headlights which is provided by the adjusting device, so that the region irradiated by the radiation emitted by the transmitter on the roadway has a small extension and with a correctly adjusted light width of the light beam emitted by the headlights is arranged at a predetermined distance from the motor vehicle, the evaluating device determining from the signals of the sensor a deviation of an actual distance of the region in front of the motor vehicle and when a deviation is detected controls the adjusting device for adjusting the predetermined distance.