| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase the reliability of detection of an intruder. SOLUTION: This passive infrared crime-preventing sensor 1 contains infrared rays detection parts 6a, 6b, and optical system parts 2a, 2b for converging infrared rays from a plurality of detection regions Qa,...Qa, Qb,...Qb having a beam form to the infrared rays sense parts, and is provided with first and second identical passive infrared detection unit A, B in the vicinity, and optical system axes Pa, Pb of the first and second passive infrared detection units are arranged so as to intersect each other at a predetermined position, and also the optical system parts are rotated for the optical system axes and arranged so that the plurality of detection regions having a beam form at a position apart from the optical system axes of the first and second passive infrared detection units are dispersed without overlapping as much as possible.</p> |
