Light Curtain

Prism light guides are long rod-like light guides made of PMMA or PC with a typical diameter of between 7 and 10 mm. The light guides generate homogeneous linear illumination. Each one is equipped with LEDs at one or both ends. The light from the LEDs is coupled into the light guide via a coupling-in lens, which sends the light onward via total reflection. Part of the light meets the whole length of the back of the light guide, where the prisms are positioned; the prisms then uncouple part of the light from the rod at 90° to its longitudinal axis. This method achieves extremely consistent illumination along the entire rod.