Passive infrared motion alarm for building has optical systems that are each provided with lens system for detecting movements in individual zones

摘要

An optical system (3) has a lens system (30) that detects movements in individual zones (5) extending from the lens system parallel to the back wall (11) of a housing (1). The optical system (2) has a lens system (20) that detects movements in individual zones (4) extending from the lens system (20).