Wächter, ChristophChristophWächterDanz, NorbertNorbertDanzMichaelis, DirkDirkMichaelisFlämmich, MichaelMichaelFlämmich2022-03-082022-03-082011https://publica.fraunhofer.de/handle/publica/309631A reflective beam shaper (100) for producing a desired emission characteristic from an emission characteristic of a surface light source (105) comprises a beam shaping areal structure (110) having a plurality of light-transmissive beam shaping openings (115) extending from a first side (112), which is to face the surface light source, to a second side (114), which is opposite the first side, through the beam shaping areal structure, wherein the light-transmissive beam shaping openings have reflective side walls (117), and wherein a lateral extent (L1) of the light-transmissive beam shaping openings on the first side of the beam shaping areal structure is smaller than a lateral extent (L2) of the light-transmissive beam shaping openings on the second side of the beam shaping areal structure, such that the emission characteristic of the surface light source is changed to the desired emission characteristic upon passage through the beam shaping areal structure.de620patent2011-2013/041137