16
3) PIR Camera composition
① Lens
It has a focal length of 3.8mm and makes it possible for you to observe a relatively wide
area.
➁ Speaker
It outputs the sound signal which was transfered from the monitor.
➂ Fresnel Lens
An infrared focusing lens for increasing the sensitivity of the built-in PIR sensor.
3
5
4
1
2
(Top) (Bottom)
SMM-15FDQ/21FDQ_ENG 9/19/03 4:50 PM Page 16