介绍了利用红外线的发射与接收所构成的光束保护系统。
The protection system of light beam formed emission and receiving of infrared ray is introduced.
红外线的发射与接收形成一“安全网”，利用其档光性能，可以实现安全防范功能。
The safety network formed by emission and receiving of infrared ray may conduct the function of safety by its blocking light function.
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