| 摘要 |
PROBLEM TO BE SOLVED: To improve resistance to disturbance light having a fixed frequency.SOLUTION: A light-projecting unit 100 emits pulse light at unequal intervals of a pulse interval. Signal light emitted by the light-projecting unit 100 is pulse light whose pulse width is 1 μ second. A light-projecting pattern is adopted which has the unequal intervals in which a first pulse interval 40 μ seconds and the next second pulse interval 38 μ seconds, such that the pulse interval is as long as 40 μ seconds, 38 μ seconds, 40 μ seconds, 38 μ seconds, 40 μ seconds, e.g., are alternately mixed. |
