Method of adjusting optical axis of headlight of vehicle
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsNagatoshi Murata, Takeshi Masaki
Life of this patent
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Abstract
An optical axis of a headlight of a vehicle is adjusted by picturing an illuminating pattern of the headlight to appear on a screen which is disposed in front of the vehicle. A position of a center of gravity of a region above a predetermined illuminance in the illuminating pattern is obtained. A position of a stepped region in which a stepped portion of a light/dark border line of the illuminating pattern is present is obtained. A position of a point of inflection, in the stepped region, of an iso-illuminance curve having a predetermined rate of illuminance relative to an illuminance in the center of gravity is measured. The optical axis is adjusted based on this point of inflection.
Claims15
A method of adjusting an optical axis of a headlight of a vehicle by picturing an illuminating pattern of the headlight to appear on a screen which is disposed in front of the vehicle, said adjusting being made based on an image of the illuminating pattern, said method comprising the steps of:
- obtaining an iso-illuminance curve in the illuminating pattern, an illuminance of each point on the iso-illuminance curve being substantially equal to a first value;
- obtaining a position of a stepped region of the iso-illuminance curve including two portions of different levels and a rising portion between the two portions of different levels extending in a direction different than directions in which the two portions of different levels extend;
- measuring a position of a point of inflection in the stepped region;
- and
- adjusting the optical axis based on the point of inflection.
A method of adjusting an optical axis of a headlight of a vehicle by picturing an illuminating pattern of the headlight to appear on a screen which is disposed in front of the vehicle, said adjusting being made based on an image of the illuminating pattern, said method comprising the steps of:
- obtaining a position of a plurality of light/dark border points based on a plurality of illuminating distributions in vertical directions of the illuminating pattern;
- defining a stepped region, in which a stepped portion of a light/dark border line of the illuminating pattern is present, by determining a region in which an amount of displacement in a vertical direction of the light/dark border line per unit length in a horizontal direction is above a predetermined value;
- and
- obtaining a position of a maximum displacement point in which a amount of displacement in the stepped region becomes maximum;
- wherein the adjustment of the optical axis is made based on the maximum displacement point.
Dependencies are inferred from the claim text.