Measuring and adjusting optical axis of a headlight

Details Measuring and adjusting optical axis of a headlight Measuring and adjusting optical axis of a headlight

G - Physics

01

B

G01B 11/26 (2006.01) G01M 11/06 (2006.01)

Patent

CA 2138059

The alignment of the optical axis of a headlight HL is examined by projecting the light from the headlamp onto a translucent screen (2). A light shielding panel (5) and an imaging screen (7) are attached to the lower portion of screen (2). Light enters the device by pinhole (6) and is reflected from mirror (8) and imaged onto screen (7). Camera (3) views both the illumination pattern on translucent screen (2) and the image of the light source on screen (7). The actual position of the headlight HL is located from the position of the source image on screen (7). A measuring area is then positioned on screen (2) and the headlamp is adjusted until a characterizing feature of the pattern on screen (2) lies within the measuring area. The optical axis may also be corrected by adjusting the headlamp so that the image of the source on screen (7) becomes a normal shape.

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