| 摘要 |
PROBLEM TO BE SOLVED: To provide a range finder which uses a light wave, can be reduced in power consumption, can quickly start range finding operations at the time of measuring the distance to an object, and can shorten the range finding time. SOLUTION: In the range finder, which uses a light wave and is provided with an optical patch switching device 5, which switches light from a light emitting element 3 to an external optical path or an internal optical path, an attenuator 19 which adjusts the light quantity from the external optical path, and a controller 25, which controls the light quantity adjustment of the attenuator 19 and performs range finding processing for measuring the distance to an object to be measured after performing light quantity balancing processing for making the light quantities from the external and internal optical paths equivalent to each other, the controller 25 has a standby mode, in which the light quantity balancing processing is not performed for a fixed period of time after the light quantity balancing processing is performed first. |
