Optics: measuring and testing – Lamp beam direction or pattern
Patent
1988-11-09
1990-03-13
Rosenberger, Richard A.
Optics: measuring and testing
Lamp beam direction or pattern
33288, 33335, G01J 100
Patent
active
049078771
ABSTRACT:
A method and apparatus for determining or adjusting a projecting direction of a light beam emitted from an automobile headlight is provided. In a first aspect of the present invention, the peripheral region of a light beam is used in determining its projecting direction. In particular, a region definable in a light pattern of the projected beam having a proportionality relation between log S and I, where S indicates the value of an area having light intensity I or above, is determined and its outer contour or any predetermined point in the contour is used in determining the projecting direction. In a second aspect, apparatus for determining a projecting direction of a light beam emitted from an automobile headlight includes an indicator which automatically indicates a predetermined position of a light pattern of the light beam projected. In a third aspect, there is provided a system for automatically adjusting a projecting direction of a light beam if it deviates from a predetermined direction using a motor engageable with a mounting structure of the headlight.
REFERENCES:
patent: 3746449 (1973-07-01), Schick
patent: 4134680 (1979-01-01), Hunter et al.
Aoki Kazuo
Asano Yoshikatsu
Fukuda Yutaka
Ishizaka Yutaka
Minagawa Koji
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