Method of and apparatus for examining automotive headlamp

An apparatus for examining an alignment of headlamp beam of an automobile in which a first mark representing a position of a headlamp beam axis and a second mark representing an allowable range for the headlamp beam axis are displayed on a monitor TV and when said first mark falls within said allowable range, a judgement is made that the alignment of the beam axis is acceptable, comprising:

• means for taking up an image of a light distribution pattern of a headlamp beam on a screen to produce a video signal;
• means for specifying a closed curved area surrounded by a line indicative of illumination intensity higher than a predetermined level in the taken-up image of the light distribution pattern;
• means for determining a position of a geometrical center of the specified closed curved area to display the position of the geometrical center on the monitor TV;
• means for measuring an area of the specified closed curved area;
• means for comparing the measured actual area of said specified closed curved area with a command area;
• and
• means for adjusting a quantity of light received by said taking up means in accordance with the result of the comparison until the measured actual area of said closed curved area becomes equal to said command area.

A method of examining an alignment of headlamp beam of an automobile in which a first mark representing a position of a headlamp beam axis and a second mark representing an allowable range for the headlamp beam axis are displayed on a monitor TV and when said first mark falls within said allowable range, a judgement is made that the alignment of the beam axis is acceptable, comprising the steps of:

• taking up by a TV camera an image of a light distribution pattern of a headlamp beam on a screen;
• specifying a closed curved area surrounded by a line indicative of illumination intensity higher than a predetermined level in the taken-up image of the light distribution pattern;
• determining a position of a geometrical center of the specified closed curved area to display the position of the geometrical center on the monitor TV;
• measuring an area of the specified closed curved area;
• comparing the measured actual area of said specified closed curved area with a command area;
• and
• adjusting said predetermined level in accordance with the result of the comparison until the measured actual area of said closed curved area becomes equal to said command area.

An apparatus for examining an alignment of headlamp beam of an automobile in which a first mark representing a position of a headlamp beam axis and a second mark representing an allowable range for the headlamp beam axis are displayed on a monitor TV and when said first mark falls within said allowable range, a judgement is made that the alignment of the beam axis is acceptable, comprising:

• means for taking up an image of a light distribution pattern of a headlamp beam on a screen to produce a video signal;
• means for specifying a closed curved area surrounded by a line indicative of illumination intensity higher than a predetermined level in the taken-up image of the light distribution pattern;
• means for determining a position of a geometrical center of the specified closed curved area to display the position of the geometrical center on the monitor TV;
• means for measuring an area of the specified closed curved area;
• means for comparing the measured actual area of said specified closed curved area with a command area;
• and
• means for adjusting said predetermined level in accordance with the result of the comparison until the measured actual area of said closed curved area becomes equal to said command area.