描述
扩散反射型光电开关它的检测头里也装有一个发光器和一个收光器，但前方没有反光板。正常情况下发光器发出的光收光器是找不到的。当检测物通过时挡住了光，并把光部分反射回来，收光器就收到光信号，输出一个开关信号。
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