| 摘要 |
<p>PURPOSE:To securely detect whether or not there is a human body by arranging a detection area of nearly the same size with part of the human body to be detected and a nondetection area alternately and adjacently. CONSTITUTION:A polygonal divided mirror or multiple divided lens is used as an optical system 1 and infrared rays from detection areas X are converged. Then an infrared detecting element 2 is arranged on the focal plane of the optical system 1 to form the detection areas X on an object surface through the optical system 1. The detection areas X and nondetection areas Y are arranged alternately and adjacently. Here, if a part of the human body is in fine motion, the element 2 generates an output as variation in temperature difference with the background. The output of the element 2 is amplified by an amplification part 3 and a processing judgement part 4 decides whether or not the peak value of the element 2 amplified by the amplification part 3 exceeds a threshold value and outputs the decision result from an output part 5. Thus, whether or not there is the human body is securely detected.</p> |
