| 摘要 |
<p>A photoelectric switch which includes a light-emitting section (8) having a plurality of light-emitting elements (7) arranged in a line, and a light-detecting section (10) having a plurality of light-detecting elements (9) arranged in a line in such a manner that the light-emitting elements (7) confront with the light-detecting elements (9), thus providing a multi-optical path therebetween. Each of the light-emitting section (8) and light-detecting section (10) is formed by connecting a base unit (11) to a relay unit (12) and/or an end unit (13), whereby the length or configuration of the photoelectric switch can be readily changed by changing the number or configuration of the relay unit (12) connected to the base unit (11).</p> |
