INFRARED LIGHT TYPE HUMAN BODY DETECTING SYSTEM

摘要

PURPOSE:To properly prevent an erroneous judgement of a small animal as a human body by clearly distinguishing these two even when a detecting beam is crossed by not only a human body but also small animals. CONSTITUTION:An infrared type human body detecting system has an infrared type human body detector K receiving infrared light emitted from a human body with an infrared light detecting element and is constituted so that its detecting beam (b) passes along with almost in parallel to the floor. And the infrared type human body detector K generates at least three detection regions Aa to Ac with different polarities each other and these three detection regions Aa to Ac are set at three points of up and down and left and right.