| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a multi-axis photoelectric switch of simple structure exerting a sure waterproofness. SOLUTION: An optical unit 18 contained in a transparent resin case 17 is housed in a main body case 12. A lid 20 covers an open end of the case 12 and is fastened to the case 12 with screws. The lid 20 with packing 19 also seals the open end of the resin case 17 tightly for water. Therefore, the optical unit 18 is free from trouble due to invasion of liquid even if water comes in through a window 16 formed on the front surface of the case 12.</p> |
