擴(kuò)散反射型（漫反射型）
Diffuse reflection type
擴(kuò)散反射型光電開關(guān)將投光器與受光器置
于一體內(nèi),光電開關(guān)反射的光被檢測物體反
射回受光器。(圖R2)
Diffuse reflection type photoelectric switch integrates the transmitter and the receiver.
Light reflected by the photoelectric switch
is reflected back to the receiver by the

鏡面反射型(反饋反射型)
convergence reflection type(condensation type)
鏡面反射型的反射式光電開關(guān)也將投光器與
受光器置于一體，它不同于其它模式是它采
用反射板將光線反射到光電開關(guān)，光電開關(guān)
與反射板之間的物體雖然也會反射光線，但
其效率遠(yuǎn)低于反射板，因而切斷反射光束。
(圖R3)
Mirror reflective type photoelectric also integrates the transmitter and the light receiver. Its difference from other models is that reflectoris used to reflect light to the photoelectric switch.Though the object between the photoelectricswitch and reflector can reflect the light, it is much less efficient than the reflector so as to cut down reflected light (Fig. R3)

會聚型反射式（聚光型）
convergence reflection type(condensation type)
會聚型反射式的光電開關(guān)的工作原理類似 于直接反射式光電開關(guān)，然而其投光器與 受光器聚焦于物距離，只有當(dāng)物體出現(xiàn)在 聚焦時(shí)，光電開關(guān)才有動(dòng)作。(圖R4)
The working principle of convergence reflection type photo switch is similar to that of direct reflection type one, while its projector and light receiver focus on object distance, only when the object presents to the focus can the
photo switch actuate. (Fig.R4)