Sub headlight unit and sub headlight system for use in vehicle that leans into turns, and vehicle that leans into turns

摘要

A sub headlight unit for use in a vehicle that leans into turns includes a plurality of sub headlight light sources to illuminate, at one side with respect to a width direction of the vehicle, an area ahead and outward of the vehicle with respect to the width direction of the vehicle. The brightness of the sub headlight light source changes in accordance with a lean angle of the vehicle. When the lean angle of the vehicle reaches a reference value that is individually set for each of the sub headlight light sources, the sub headlight light source exhibits a predetermined brightness. The reference values are greater than 0° and different from one another. The reference values are set to be values sequentially increasing at intervals from 0° such that the interval is smaller as the reference value is greater.