| 摘要 |
PROBLEM TO BE SOLVED: To quickly and precisely determine the existence/absence of a detection object even in the case of intermittently detecting a change in ambient environment.SOLUTION: A detection part 33 of a human sensor 14 outputs a pulse signal having a width corresponding to a detection time each time a change in infrared ray within an ambient specific area is detected. A determination part 35 of the human sensor 14 reads setting information from a storage part 32, and compares a human detection time T1 shown by the setting information with the width of the pulse signal. If the width of the pulse signal is equal to or more than the human detection signal T1, a detection signal showing that a human body is detected is outputted. If not, the number of pulse signals whose width is less than the human detection time T1 among the past and current pulse signals is counted between before a human detection period T2 shown by the setting information and the current point of time. Then, the number of counted pulse signals is compared with the number of times of human detection shown by the setting information. When the number of pulse signals is equal to or more than the number of times of human detection, a determination signal showing that a human body is detected is outputted. |
