Automotive headlamp testing method and apparatus

Details Automotive headlamp testing method and apparatus Automotive headlamp testing method and apparatus

1984-07-17

1987-03-03

Rosenberger, R. A.

Optics: measuring and testing

Lamp beam direction or pattern

356154, G01J 100

Patent

active

046471952

ABSTRACT:
A headlamp testing method of the invention involves the steps of applying the low beam of the headlamp onto a screen, determining the position of the geometrical center of a closed area of illuminance higher than a predetermined level, determining the position of a cut off line cross point from the position of the geometrical center and a predetermined amount of offset, and determining a presumption line cut off line from the cut off line cross point. The presumption line thus determined is displayed together with a mark which indicates the within which the cross point should fall, and the headlamp beam is judged as being acceptable when the cross point is located within this range.

REFERENCES:
patent: 3077139 (1958-07-01), Todd et al.

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