| 摘要 |
<p>PURPOSE: To enable getting long life with low power consumption by providing with a means capable of detecting a detection object in a specific direction, an operation period alteration means for shortening the operation period with a function control means and an output generation means and the like for outputting an alarming signal. CONSTITUTION: A detection device 1 is capable of detecting in plurality of directions. A memory means 2 stores the detection data D1 to D5 and the like output by the detection device 1. A comparison circuit 4 generates a detection signal. A function period alteration circuit 5 shortens the functional period. In an alarm signal generation circuit 6, whether a specific condition such as an invader surely exists is fulfilled or not is judged by the detection output signal of the comparison circuit 4 or a detection function signal output from the detection device 1 to a terminal S7 and the alarm signal is output to a terminal AS. Here, only when there is a possibility of existence of the detection object, detailed detection is conducted to surely detect the object and unnecessary detection operation is not conducted and thus, power saving is possible.</p> |
