| 摘要 |
<p>PURPOSE:To securely decide the presence of a human body by forming detection areas adjacently by infrared detecting elements and setting the size of the detection areas almost to the size of the part of the human body to be detected. CONSTITUTION:Infrared rays from the detection areas are converged by using an optical system 1 of compound-eye constitution like a polygon divided mirror or multiple divided lens. The infrared detecting elements A - D are arranged on the focal plane of the optical system 1 and then the detection areas A' - D' are formed on an object surface through the optical system 1 in the same arrangement with the elements A - D on a focal plane, so that the elements A - D generate outputs as variation in temperature difference with the background by the movement of the human body among the areas A' - D'. Then the outputs of the elements A - D are amplified by an amplification part 3. Here, the elements A and B, and C and D are paired and two elements in each pair are connected in series having the opposite polarities. Then a processing decision part 4 compares peak values and threshold values from the outputs of the elements A and B, and C and D which are amplified by the amplification part 3 to decide the presence or absence of the human body, and the decision result is outputted 5.</p> |
