| 摘要 |
<p>PURPOSE: To provide a reflection type photoelectric sensor which can reduce the fluctuation of a light receiving amount resulting from the fluctuation of the distance of an object to be detected, and can stably detect the existence and the surface state of the object to be detected without the influence of the distance fluctuation of the object to be detected. CONSTITUTION: A light projecting light axis by a light projecting element 2 and a light receiving light axis by a light receiving element 5 cross with a predetermined angle, and such an aperture stop 7 as shades reflected light from an object to be detected at a short distance much more than a reflected light of an object to be detected at a long distance is provide in front of the light receiving element 5. Thereby, the existence and the like of the object to be detected 4 can stably be detected without the influence of the distance fluctuation of the object to be detected 4.</p> |
