BEAM SHAPING SYSTEM AND AN ILLUMINATION SYSTEM USING THE SAME

摘要

A beam shaping system is for example for use over an array of light sources. An array of beam shaping units is arranged in a general plane, each beam shaping unit comprising a central refracting area, an intermediate total internal reflection area for processing of light from a light source beneath the central area, and an outer total internal reflection area for processing light from the nearest light source and an adjacent light source. This outer area essentially extends the useful size of the adjacent beam shaping unit to improve the beam shaping performance and/or the optical efficiency.

主权项

1. A beam shaping system comprising an array of beam shaping units arranged in a general plane, each beam shaping unit comprising:
a central area for providing a beam passing function by refracting light from a light source beneath the central area; an intermediate area for providing a beam shaping function via total internal reflection of light from the light source beneath the central area; an outer area for providing a beam shaping function via total internal reflection of light from the light source beneath the central area and also providing total internal reflection of light from a light source beneath the central area of an adjacent beam shaping unit, and each beam shaping unit having a contoured surface for facing an array of light sources, wherein the contoured surface in the intermediate area and the outer area comprises a set of light deflecting prismatic elements, each having a first face for facing towards the light source and a second face for facing away from the light source, wherein the first face extends from the general plane at a first angle α and the second face extends from the general plane at a second angle β, wherein for the set of light deflecting prismatic elements in the intermediate area α<85°, β>50°, |α−β|>5°, wherein for the set of light deflecting prismatic elements in the outer area 50°<α, β<60° and |α−β|<5°.