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

1995-03-28

1997-04-08

Epps, Georgia Y.

Optics: measuring and testing

Lamp beam direction or pattern

356122, 356153, 356123, H05B 3700

Patent

active

056193220

ABSTRACT:
That illuminating pattern of the headlight which appears on a screen disposed in front of the vehicle is pictured. The optical axis of the headlight is adjusted based on an image of the illuminating pattern. A distribution of illuminance of the illuminating pattern along a scanning line which bridges a light portion and a dark portion of the image of the illuminating pattern is measured. A position of a reference point which serves as a reference in adjusting the optical axis is obtained from that point on the scanning line which corresponds to a crossing point of a first straight line and a second straight line. The first straight line is obtained from a portion corresponding at least to one of the light portion and the dark portion of a curve which represents the measured distribution of illuminance. The second straight line is obtained from a portion corresponding to a transient region which is positioned between the light portion and the dark portion.

REFERENCES:
patent: 4632545 (1986-12-01), Schael
patent: 4634275 (1987-01-01), Yoshida et al.
patent: 5373357 (1994-12-01), Hopkins et al.
patent: 5379104 (1995-01-01), Takao
patent: 5392111 (1995-02-01), Murata et al.
United Kingdom Search Report dated Nov. 15, 1995 of Great Britain Application No. GB 9507417.5 citing above listed references.

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