| 摘要 |
PURPOSE:To enable automatic collimation to be performed by providing a mechanism for alternately oscillating the optical axis of an objective lens in horizontal and vertical directions and detecting the deviation of servo light reflected from a reflector on the optical axial. CONSTITUTION:A range finder is constituted by a light emitting element 16 for emitting collimation servo light 18 to a reflector 4 at a ranging target point, a photosensitive element 19 for receiving reflected light from the reflector 4, a servo mechanism (servo circuit 2a, X axis gear motor 11, Y axis gear motor 12) for alternately oscillating the optical axes of objective lenses (light feed lens 13, light receiving lens 14) in horizontal and vertical directions and a light wave range finder 3 directed in the collimating direction of the objective lenses. The deviations of the optical axes are detected by change in a received light level and collimation servos 11 and 12 are alternately conducted in horizontal and vertical directions so that the deviations become maximum. Then, the quantity of the fed servo light 18 is adjusted and the received light level is set to a prescribed value. When the received light level is stored, a range is measured 3. Thereafter, the collimation and range measurement are alternately performed in the same manner.
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