| 摘要 |
PURPOSE:To obtain a easy-to-handle device of simple structure which operates stably by using a power supply line and a signal output line in common and to add a power supply circuit for powering up a detecting circuit during signal output. CONSTITUTION:When no human body moves in a detection area, namely, when a switching circuit 3 is off, an electronic switch 4 is also off, so electric power from a controller 5 operates a detecting circuit including an infrared detecting element 1 and at the same time, a secondary battery 7 is charged. When the human body enters the detection area and the switch circuit 3 turns on to close the electronic switch 4, the electric power from the controller 5 short-circuits the electronic switch 4 and returns to the controller 5 again, the consequently the controllers 5 operates to open an automatic door. The electric power supply from the controller 5 to the detecting circuit is interrupted during the signal output to this controller 5, but the detecting circuit is powered on by the secondary battery 7 instead of the controller 5; the secondary battery 7 functions at the same time with the conduction of the electronic switch 4. |
