| 摘要 |
PURPOSE:To reduce a space for inspection of a distance measuring apparatus by shortening an optical path by interposing an angle-deflecting prism mechanism in the direction of light projection of a projecting element, and by lessening the quantity of light to be sensed by a light-sensing element by controlling properly the quantity of light transmitted through the optical path from the projecting element to the light- sensing element. CONSTITUTION:When inspection is made as to whether a distance measuring apparatus 1 operates correctly or not, a set distance to a subject is inputted to an arithmetic element 20. Then a signal is outputted from the arithmetic element 20 to a second driving element 21 and thereby an angle-deflecting prism mechanism 11 is operated to deflect the angle of an optical path properly. Then, inspection is made as to whether the result of this measurement of the distance is in accord with said distance or not. Since the optical path to the subject is shortened by the mechanism 11, on the occasion, the distance to the subject can be reduced. In addition, the quantity of light to be sensed by a light-sensing element 3 is lessened by controlling the quantity of light transmitted by a filter 7, on the occasion, and therefore the distance measuring apparatus 1 operates properly. Accordingly, a space for inspection of the distance measuring apparatus 1 can be reduced and secured. |
