LIGHT CONTROL DEVICE, CONTROL METHOD, PROGRAM, AND STORAGE MEDIUM

A LIDAR unit 100 includes: an LD driver 12, a laser diode 13, and a scanner 14 that correspond to an emission unit; a photo detector 16, a current/voltage conversion circuit 17, a A/D converter 18 and an valuable segmenter 19 that correspond to a light receiving unit; a landmark position prediction unit 2 and landmark map acquisition unit 3 that acquire position information indicating the position of a landmark on a map; and a synchronization controller 11 that generates a valuable pulse trigger signal S2 and a segment extraction signal S3. On the basis of a predicted value of the current position of a vehicle and the position of the landmark on the map, the landmark position prediction unit 2 determines a predicted angular range Rtag in which the landmark is predicted to be situated. The synchronization controller 11 generates the valuable pulse trigger signal S2 and the segment extraction signal S3 such that the scan density of the light pulse is higher in the predicted angular range Rtag than the scan density of the light pulse in the other range.