The principle of photoswitch: the projector will ju dge and react on the basis of light beam from the projector which is interdicted by object or emitted partly.

• 光电开关工作原理光电开关工作原理光电开关的原理是根据投光器发出的光束；被物体阻断或部分反射；受光器最终据此作出判断反应.