| 摘要 |
PROBLEM TO BE SOLVED: To provide a distance measuring device capable of accurately measuring distance in normal state and roughly measuring distance even in the case where detection of phase difference is impossible without being made impossible to measure. SOLUTION: The distance measuring device is provided with a light casting means 10 casting first light wave in pulse shape and a second light modulated with a reference signal of a period toward a distance measuring object 2, a light reception means 11 receiving reflection light R from the distance measuring object 2, a first measuring part 12 roughly calculating the distance D' to the distance measuring object 2 from the time difference between casted light F and reflected light R of the first light wave, a second measuring part 13 calculating a specific distance informationϕto the distance measuring object 2 from the phase difference between the casted light F and reflected light R of the second light wave, and a distance calculation part 14 calculating the distance D to the distance measuring object 2 from the rough estimate result D' of the first measuring part 12 and the distance informationϕof the second measuring part 13, and in the case where the second measuring part 13 is impossible to calculate the distance informationϕ, the distance calculation part 14 calculates the distance to the distance measuring object 2 based only on the rough estimate result D' of the first measuring part 13.
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