Method of adjusting optical axis of headlight of vehicle
First Claim
1. A method of adjusting an optical axis of a headlight of a vehicle comprising:
- picturing that illuminating pattern of the headlight which appears on a screen disposed in front of the vehicle; and
adjusting the optical axis of the headlight based on an image of the illuminating pattern;
wherein the improvement comprises;
measuring a distribution of illuminance of the illuminating pattern along a scanning line which bridges a light portion and a dark portion of the image of the illuminating pattern; and
obtaining a position of a reference point which serves as a reference in adjusting the optical axis from that point on the scanning line which corresponds to a crossing point of a first straight line and a second straight line, said first straight line being obtained from a portion corresponding at least to one of the light portion and the dark portion of a curve which represents the measured distribution of illuminance, said second straight line being obtained from a portion corresponding to that transient region of the curve which is positioned between the light portion and the dark portion.
1 Assignment
0 Petitions
Accused Products
Abstract
That illuminating pattern of the headlight which appears on a screen disposed in front of the vehicle is pictured. The optical axis of the headlight is adjusted based on an image of the illuminating pattern. A distribution of illuminance of the illuminating pattern along a scanning line which bridges a light portion and a dark portion of the image of the illuminating pattern is measured. A position of a reference point which serves as a reference in adjusting the optical axis is obtained from that point on the scanning line which corresponds to a crossing point of a first straight line and a second straight line. The first straight line is obtained from a portion corresponding at least to one of the light portion and the dark portion of a curve which represents the measured distribution of illuminance. The second straight line is obtained from a portion corresponding to a transient region which is positioned between the light portion and the dark portion.
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Citations
6 Claims
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1. A method of adjusting an optical axis of a headlight of a vehicle comprising:
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picturing that illuminating pattern of the headlight which appears on a screen disposed in front of the vehicle; and adjusting the optical axis of the headlight based on an image of the illuminating pattern; wherein the improvement comprises; measuring a distribution of illuminance of the illuminating pattern along a scanning line which bridges a light portion and a dark portion of the image of the illuminating pattern; and obtaining a position of a reference point which serves as a reference in adjusting the optical axis from that point on the scanning line which corresponds to a crossing point of a first straight line and a second straight line, said first straight line being obtained from a portion corresponding at least to one of the light portion and the dark portion of a curve which represents the measured distribution of illuminance, said second straight line being obtained from a portion corresponding to that transient region of the curve which is positioned between the light portion and the dark portion. - View Dependent Claims (2, 3, 4)
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5. A method of adjusting an optical axis of a headlight of a vehicle comprising:
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picturing that illuminating pattern of the headlight which appears on a screen disposed in front of the vehicle; and adjusting the optical axis of the headlight based on an image of the illuminating pattern; wherein the improvement comprises; measuring a distribution of illuminance of the illuminating pattern along a scanning line which bridges a light portion and a dark portion of the image of the illuminating pattern; obtaining a position of a reference point which serves as a reference in adjusting the optical axis from that point on the scanning line which attains a predetermined ratio of illuminance relative to a maximum value of illuminance of the measured illuminance; and changing the ratio depending on a rate of change in illuminance. - View Dependent Claims (6)
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Specification