| 摘要 |
PURPOSE: To prevent range-finding time from being prolonged. CONSTITUTION: Range-finding is executed by both an active system and a passive system. A judging part 54 detects that the range-finding by the passive system made using many photodiodes 51 exceeds normal time, and by a detected result a range-finding value selecting circuit 40 selects the result of the range- finding by the active system as a range-finding value. |
