Optics: measuring and testing – Lamp beam direction or pattern
Patent
1984-07-17
1987-01-06
Evans, F. L.
Optics: measuring and testing
Lamp beam direction or pattern
358107, G01J 120
Patent
active
046342753
ABSTRACT:
A method of examining the state of alignment of headlamp beam axis has the following steps: taking up by a TV camera the image of the light distribution pattern of a headlamp beam on a screen; specifying a closed curved area of illumination intensities higher than a predetermined level in the taken-up image of the light distribution pattern; determining the position of the geometrical center of the specified closed curved area and displaying the position of the geometrical center on a monitor TV; measuring the area of the specified closed curved area; comparing the measured actual area of the closed curved area with a command area; adjusting the quantity of light received by the TV camera in accordance with the result of the comparison until the measured actual area of the closed curved area becomes equal to the command area; and displaying, on a monitor TV, a pattern representing the allowable range and a mark representing the position of the beam axis. When the marks falls within the allowable range, it is judged that the state of alignment of the beam axis is acceptable.
REFERENCES:
patent: 4120589 (1978-10-01), Mima et al.
Kamemoto Mituo
Yoshida Mamoru
Evans F. L.
Harringa Joel L.
Toyota Jidosha & Kabushiki Kaisha
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