Dielectric collimator with blocking center lens

摘要

A dielectric collimator 1 including a central lens 3, wherein the central lens includes a light incident surface 31 and a light exit surface 32, and the light exit surface 32 is convex and substantially hemispherical. A central surface portion 312 forming a light transmitting portion of the central lens, adapted to receive and transmit the incident light 5 and emit it from the light exit surface; A peripherally extending annular outer surface portion 311 adapted to redirect the light 5 so that the redirected light 7 undergoes TIR at the light exit surface and is emitted and returned from the light entrance surface. And.