INFRARED RAY SENSOR AND MONITORING DEVICE USING IT

摘要

PROBLEM TO BE SOLVED: To lengthen the service life, to facilitate maintenance/inspection, and to improve monitoring accuracy by constituting a pyroelectric element of a light receiving electrode plate for monitoring a two-dimensional scanning monitoring area formed by unfolding an one-dimensional monitoring area by being continuously arranged in a light receiving electride row for monitoring the one-dimensional monitoring area. SOLUTION: A circular pyroelectric element E mounted on a printed circuit board of an infrared ray sensor is constituted of a light receiving electrode row L1 for monitoring an one-dimensional monitoring area and a light receiving electrode plate L2 having the slightly large light receiving surface expanding in the lateral direction and monitoring a two-dimensional scanning monitoring area formed by unfolding the one-dimensional monitoring area together with the light receiving electrode row L1 by juxtaposing plural light receiving electrodes E1 to E8 in a row. The light receiving electrodes E1 to E8 are a square shape, and constitute the light receiving electrode row L1 by one channel (CH) to 8 CH, and the light receiving electrode plate L2 is constituted of almost semicircular light receiving electrodes Ea, Eb to be continuously arranged on both sides by sandwiching the light receiving electrode row L1 . Therefore, when a fire is caused in the two-dimensional scanning monitoring area, the pyroelectric element E judges the occurrence of the fire by receiving infrared rays.