| 摘要 |
PROBLEM TO BE SOLVED: To visually confirm the irradiated region of a transmission light beam and to easily judge the target object is within a transmission enable position. SOLUTION: On the front face of an equipment housing, an infrared transmission part 20 having an infrared irradiated region T and a visible light emitting part 18 having a visible light optical axis P passing through the center of the infrared irradiated region T are arranged. The infrared irradiated region T can not be seen by the eyes but the visible light optical axis P can be recognized by the eyes, and by moving a present equipment housing so that the infrared reception part of opposite equipment matches the visible light optical axis P, the infrared reception part of opposite equipment can be brought into the infrared irradiated region T. |
