| 摘要 |
PROBLEM TO BE SOLVED: To provide a crime prevention sensor with a light intensity attenuation plate allowing the proper adjustment of the light intensity of detection rays by easy operation. SOLUTION: A plurality of light intensity attenuation plates 50 of the same shapes having a plurality of through holes 51 are overlappingly disposed in front of an emission mirror 24 (a condenser mirror 24), and an attenuation amount is varied by differing an attitude of at least one plate from an attitude of the other plate. Thereby, the light intensity of the detection rays can be attenuated to prescribed intensity by the easy operation, and the proper adjustment becomes possible according to a caution distance. Because the light intensity attenuation plates 50 have the same shapes not to need to manufacture a plurality kinds of light intensity attenuation plates, cost can be reduced. COPYRIGHT: (C)2006,JPO&NCIPI |
