LC17-G is the elevator the elevator door protection system of infrared light curtain safety edge upgrade product, it solves the conflict with the shortcomings of the purely mechanical action, damage, reliable performance and long service life. Screens installed in the elevator doors on each side of the IR transmitter and receiver, installed on car top the power pod and the private, flexible cable consisting of four parts. Completed it to non-contact door monitoring and action capabilities. 32 in the transmitter (17) infrared emission tube, under the control of MCU, launching receiver open, continuous scans from top to bottom, formed an intensive infrared light in the car door area protection screens. When any of them when a beam of light is blocked, elevator door stop off and flip open, so as to achieve the objective of protecting passengers.