Photoelectric determination of the cut-off of a light beam from

Details Photoelectric determination of the cut-off of a light beam from Photoelectric determination of the cut-off of a light beam from

1976-03-18

1978-05-30

Corbin, John K.

Optics: measuring and testing

Lamp beam direction or pattern

G01J 100

Patent

active

040920712

ABSTRACT:
The invention relates to methods and devices for determining the position of the cut-off of the light beam from a motor vehicle headlight. A pair of light detectors D.sub.c and D.sub.1 are located on a screen and the headlight and screen moved relatively to one another until the light intensities I.sub.c and I.sub.1 satisfy the relation

REFERENCES:
patent: 3386333 (1968-06-01), Preston
patent: 3467473 (1969-09-01), Preston
patent: 3746449 (1973-07-01), Schick

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