| 摘要 |
PURPOSE:To make the distance measurement information in a center part important so as to prevent the focusing of the nearest peripheral object and to prevent the focusing in the center part from being soft by setting the near weighted average result of distance measurement as a focal distance. CONSTITUTION:According to a control signal from an MPU 6, a light emission control circuit 2 executes primary light emission that light projecting elements 1a and 1b are lighted in a set timing and secondary light emission that the light projecting elements 1b and 1c are lighted in a set timing. And the reflected light from an object is formed into a real image on the surface of a photodetector 3 and according to the output thereof, the distance to the object corresponding to respective range-finding points in an image plane is calculated in a range- finding circuit 4 so as to compute the weighted average result of distance measurement by the primary light emission and the secondary light emission. The respective weighted average results of distance measurement are read in the MPU 6 and the focusing position that the near weighted average result of distance measurement is set as the focal distance is computed. Based on the computed result, a driving circuit 7 moves a photographic lens unit 8 to a specified position. |
