Patent ID: 6150658
Filing Date: 2000-11-21
Classification: G01J,G01P,G08B,Y10S

Abstract:
A passive infrared detector comprising:a plurality of sensor units each including a reflecting mirror and a sensing element placed at a position of a focus of said reflecting mirror;a sensor mounting plate having said sensor units arranged thereon in a circumferential direction, each sensor unit being rotatable in a vertical direction;a slot formed radially in said sensor mounting plate opposite to each of said sensor units;a rotating plate rotatably mounted on said sensor mounting plate;a circumferential slit former circumferentially in said rotating plate such that a distance from a center of said rotating plate to said circumferential slit gradually decreases; andan adjusting rod connected at one end thereof to each sensor unit, the other end of said adjusting rod extending through said slot and said circumferential slit;wherein movement of said circumferential slit caused by rotation of said rotating plate is transmitted to said adjusting rod to cause said adjusting rod to move in said slot, thereby enabling a vertical angle of each sensor unit to be adjusted.