Light projection device and light projection device for moving body

A light projection device for a moving body which is mounted on the moving body and irradiates light to a front of the moving body, comprising:

• a light source having a plurality of light emission portions arranged side by side in a predetermined direction;
• a projection lens in which light is irradiated from the plurality of light emission portions;
• an optical scanner having a mirror portion which scans light passed through the projection lens in a direction in which the plurality of light emission portions is aligned, and a drive source which swings the mirror portion;
• a detection portion detecting a region which shields light in a region in which the light scanned by the mirror portion is irradiated;
• a swing angle acquisition portion which acquires a swing angle of the mirror portion;
• and
• a control portion which controls formation of the region which shields light and the region which irradiates light by switching between a turn-on state and a turn-off state of a light emission portion among the plurality of light emission portions, which emits light scanned in the region which shields light, based on a detection result acquired by the detection portion and the swing angle of the mirror portion acquired by the swing angle acquisition portion, wherein
• the mirror portion scans a scanning light, which is irradiated from each of the plurality of light emission portions and scanned by the mirror portion, so as to form an intensity distribution having a central valley part and peaks located on two sides of the valley part, and
• the optical scanner scans light irradiated from the plurality of light emission portions in a manner that at least the peak of the intensity distribution of scanning light of other light emission portion is located in the valley part of the intensity distribution of the scanning light.