Apparatus for measuring optical-axis deflection angle of headlig

Details Apparatus for measuring optical-axis deflection angle of headlig Apparatus for measuring optical-axis deflection angle of headlig

1991-12-16

1993-05-11

Evans, F. L.

Optics: measuring and testing

Lamp beam direction or pattern

G01J 100

Patent

active

052105890

ABSTRACT:
In the apparatus for measuring optical-axis deflection angle of a headlight, according to the present invention, the optical-axis detecting means (3) detects the optical axis (l") of the light projected at the first location (E.sub.1) from the headlight (7), and the screen box moving mechanism (2) moves until the position of the optical axis (l") coincides with the center of the screen (9). Then, the screen box is stopped there. Next, the screen moving mechanism (10) is put into operation to move the screen (9) from the first location (E.sub.1) to the second location (E.sub.2), the optical-axis detecting means (3) detects the optical axis (l") from the light projected onto the screen (9), and the controlling means (6) makes a predetermined calculation from the information on the optical-axis position, thereby calculating a deflection angle (.alpha..sub.1, .alpha..sub.2) of the optical axis.

REFERENCES:
patent: 3666369 (1972-05-01), Carrigan

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