| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a limited reflection type photoelectric switch capable of making use of advantages of a limited reflection type and widening a range of detecting a body for directly reflecting light, in particular, a distance range. SOLUTION: In the head 1 of a limited reflection type photoelectric switch, the optical axis of a light projection unit 14 intersect the optical axis of a light receiving unit 17 at a predetermined angle. The light receiving unit 17 has a photodetector 16, a light receiving lens 15 and a diffusion sheet 15a. The diffusion sheet 15a is disposed in front of the light receiving lens 15, that is, on the optical axis on the side opposite to the photodetector 16 across the light receiving lens 15. Light emitted from the light projection unit 14 and reflected by the surface of an object to be detected passes through the diffusion sheet 15a, thereby being diffused in various directions, and part of the light passes through the light receiving lens 15 and is converged on the photodetector 16.</p> |
