| 摘要 |
<p>PURPOSE:To delete the mechanical adjustment and detect the existence of a detected object accurately by arranging a plurality of photoreceiving elements continuously in line and forming a photoreceiving element group and outputting the photoeletric conversion powers out of each half as positive and negative outputs and calculating the difference. CONSTITUTION:In the case of non-existence of a parking car 4, the reflection light from the floor reflection surface 20 is condensed through an optical system to form a floor surface light point 21. Wherever the light point 21 may be formed in the photoreceiving surface, positive or negative voltage is output in analog according to the relative point, and so the mechanical adjustment of the photoreceiving surface point is not necessary. In the case of existence of a car 4, the incidence angle of the reflection light from the car reflection surface 40 is different, and so the point of the car surface light point 41 is formed at different point from the light point 21. Therefore, by comparing the positive output and the negative output from a photoreceiving elements group 7, the shift of the light point forming is detected and the existence of the car 4 can be detected.</p> |
