| 摘要 |
PROBLEM TO BE SOLVED: To perform stable output control by accurately detecting the outputs of respective light emitting elements without any crosstalk when the light emitting elements are arranged closely side by side. SOLUTION: This device comprises a 1st light emitting element 1, a 2nd light emitting element 2 which is arranged nearby the 1st light emitting element 1 and has its control controlled independently of the 1st light emitting element 1, a 1st output monitor element 3 which is arranged only at a 1st specific place nearby the rear light emission point P1b of the 1st light emitting element 1 and photodetects the rear light emission output of the 1st light emitting element 1, and a 2nd output monitor element 4 which is arranged only at a specific place nearby the rear light emission point P2b of the 2nd light emitting element 2 and photodetects the rear light emission output of the 2nd light emitting element 2. The 1st and 2nd specific places are arranged outside a radiation angle overlap area 77 where 1st and 2nd radiation angle ranges 6 having at vertexes the rear light emission points P1b and P2b of the 1st and 2nd light emitting elements 1 overlap with each other. |
