Elevator light curtain is made of a kind of principle of photoelectric sensor and elevator door safety device, applicable to all the elevator, to ensure the safety of the passengers in and out of the elevator. Elevator light curtain is installed in the elevator door on both sides of the infrared transmitter and receiver and special flexible cable is composed of three parts. Need for environmental protection and energy saving, more and more elevator have dispense with power supply box. Some brands of screen due to electromagnetic interference resistance is poor, also had to power supply box must be used. But with the popularity of green elevator concept, from the power supply box screen is a trend. For the 220 v turned 24 v is bound to lose a lot of energy in the process.
Light curtain transmitter has several infrared transmitting tube, under the control of MCU, launch receiving tube opening, one launch hair shoot the light is more receiving head, forming multiple scan. Continuous scanning through the top-down car door area, forming a dense infrared light curtain protection. When any of them a beam of light will be blocked, unable to realize the photoelectric conversion, screen covered, so an interrupt signal output. The interrupt signals can be a switch quantity, also can be high and low level signals. Upon receiving the signal from the screen to control system, immediately open output signal, the car door stop off and reverse open, until the passenger or the obstacle after leaving the warning area elevator door can normally closed, so as to achieve security purposes, which can avoid the elevator clip person accident.