| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical angle measuring apparatus allowing the output signal level of a two-dimensional image sensor to be within a preset range without complicated adjustment work. SOLUTION: The peak value of light receiving amount of the two-dimensional image sensor is detected (step #101), and the projection amount is controlled to increase and decrease so that the peak value is within the preset range (step #103-105). That is, when the peak value is larger than the upper limit value of the preset range, the projection amount is decreased (step #104), and when not larger than the lower limit value, the projection amount is increased (step #105). When the peak value is within the preset range (dead zone), the projection amount will not be increased and decreased. Even if the projection amount reaches the upper limit preset value, if the peak value does not reach the lower limit value of the preset range, a stray light spot is decided to output a warning signal (step #107).
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