| 摘要 |
PROBLEM TO BE SOLVED: To provide a light wave range finder, having stable range detection precision over a wide range of measurement ranges. SOLUTION: This light wave range finder has a coaxial optical system, comprising a projection optical system and a light-receiving optical system, wherein a light projector 10, a light receiver 20 and a light-receiving lens 21 are disposed coaxially. The light-receiving lens 21 is formed such that each lens portion of the light-receiving lens 21 varies from the lens portion for close range detection (i.e., a lens portion for condensing reflected light from a detection point at a small measurement range onto the light receiver 20) to the lens portion for far range detection (i.e., a lens portion for condensing reflected light from a detection point at a large measurement range onto the light receiver 20), going from the detection optical axis toward the outside. Thereby toward the change of a received light amount condensed onto and detected by the light receiver 20 of the reflected light according to the measurement range can be suppressed. As a result, the light wave range finder having stable range detection accuracy over a large scope of measurement ranges is realized.
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