Light distribution control method and light distribution control device for a vehicular headlamp

A light distribution control device for a vehicular headlamp, comprising:

• a headlamp which illuminates, in a desired light distribution pattern, plural illumination regions arranged in the left-right direction for illumination of a region ahead;
• vehicle ahead detector which detects vehicle positions of a vehicle ahead;
• and
• light distribution controller which reduces selected ones of the plural illumination regions in light quantity according to the detected vehicle positions, wherein:
• the light distribution controller sets corrected vehicle positions by adding margins to the detected vehicle positions in the left and right directions, respectively, detects illumination regions where the vehicle ahead exists on the basis of the corrected vehicle positions and reduces the detected illumination regions in light quantity.

A light distribution control device for a vehicular headlamp, comprising:

• a headlamp which illuminates, in a desired light distribution pattern, plural illumination regions arranged in the left-right direction;
• vehicle ahead detector which detects a vehicle ahead;
• and
• light distribution controller which reduces selected ones of the plural illumination regions in light quantity according to the detected vehicle positions, wherein:
• the light distribution controller is configured so as to be able to set boundary positions of each of the plural illumination regions at different positions according to a type of the detected vehicle ahead on the basis of a luminous intensity distribution of each of the plural illumination regions.

A light distribution control device for a vehicular headlamp, comprising:

• a headlamp disposed in at least a portion, in the vehicle width direction, of a vehicle;
• vehicle detector which is disposed at a different position in the vehicle width direction than the headlamp and detects a vehicle ahead;
• and
• light distribution controller which controls a light distribution of the headlamp on the basis of a vehicle position of the detected vehicle ahead, wherein:
• the light distribution controller is configured so as to be able to perform a light distribution control to form a non-illuminated region for preventing dazzling of persons in the vehicle ahead on the basis of the vehicle position of the detected vehicle ahead, to perform a light distribution control on the basis of the detected vehicle position for illumination regions outside the non-illuminated region in the vehicle width direction, and to perform a light distribution control on the basis of a vehicle position that is corrected for a parallax angle between the headlamp and the vehicle detector, for illumination regions inside the non-illuminated region in the vehicle width direction.