Method of adjusting optical axis of headlight of vehicle

Details Method of adjusting optical axis of headlight of vehicle Method of adjusting optical axis of headlight of vehicle

1996-10-30

1998-08-18

Hantis, K.

Optics: measuring and testing

Lamp beam direction or pattern

G01J 100

Patent

active

057964734

ABSTRACT:
An optical axis of a headlight of a vehicle is adjusted by picturing an illuminating pattern of the headlight to appear on a screen which is disposed in front of the vehicle. A position of a center of gravity of a region above a predetermined illuminance in the illuminating pattern is obtained. A position of a stepped region in which a stepped portion of a light/dark border line of the illuminating pattern is present is obtained. A position of a point of inflection, in the stepped region, of an iso-illuminance curve having a predetermined rate of illuminance relative to an illuminance in the center of gravity is measured. The optical axis is adjusted based on this point of inflection.

REFERENCES:
patent: 4634275 (1987-01-01), Yoshida et al.
patent: 5373357 (1994-12-01), Hopkins et al.

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