Patent ID: 7086763

Claim:
An apparatus for adjusting a direction of a light axis of a vehicle headlight comprising; a vehicle height sensor to be mounted on a vehicle for detecting a displacement of a vehicle height; an inclination calculating unit for calculating, on the basis of an output of said vehicle height sensor, inclination of said direction of said light axis of said vehicle headlight to a horizontal plane by using an approximating curve constituted by three straight line segments lying in first, second and third regions respectively, said three straight line segments having different slopes and being jointed to one another, said first region corresponding to a load condition where all seats of said vehicle are occupied and said vehicle is loaded with 30 to 50% of maximum loading capacity thereof, said second region corresponding to a load condition where all said seats of said vehicle are occupied and said vehicle is loaded with 90% or more of said maximum loading capacity, said third region being a region interposed between said first region and said second region; and a light axis direction adjusting unit for adjusting said direction of said light axis of said vehicle headlight in accordance with said inclination calculated by said inclination calculating unit.