Patent ID: 8840270
Filing Date: 2014-09-23
Classification: F21V,F21W,F21Y

Abstract:
1. A luminaire comprising: at least one optoelectronic semiconductor device; at least one primary optical unit which is disposed downstream of the semiconductor device and is spaced apart from the semiconductor device; and a secondary optical unit and a tertiary optical unit which are disposed downstream of the primary optical unit, wherein a proportion of at least 50% of radiation emitted by the semiconductor device passes to the secondary optical unit and to the tertiary optical unit, wherein the secondary optical unit and the tertiary optical unit are arranged for small-angle scattering of the radiation such that an average scattering cone of the radiation scattered by the secondary optical unit and the tertiary optical unit has an aperture angle between 1° and 5° inclusive, wherein the secondary optical unit comprises two terminal surfaces which are disposed in plane-parallel manner with respect to each other and in each case perpendicularly with respect to a longitudinal direction, wherein the secondary optical unit is subdivided into a plurality of blades in a direction perpendicular to the longitudinal direction so that the blades are disposed in parallel with each other along the longitudinal direction and all the blades are formed from a connected, single-piece material and can be described by a once continuously differentiable function in the direction perpendicular to the longitudinal direction, wherein a boundary between two adjacent blades is defined by a minimum of the continuously differentiable function and a distance between two minima corresponds to an entire width of the corresponding blade, and wherein an inner width of the blades between two turning points of the continuously differentiable function constituting the blades is between 60% and 65% inclusive of the entire width of the corresponding blade when seen in a cross-sectional view.