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- W2196365557 abstract "ABSTRACT Todays SSL illumination market shows a clear trend towards high flux packages with higher efficiency and higher CRI, realized by means of multiple color chips and phosphors. Such light sources require the optics to provide both near- and far-field color mixing. This design problem is particularly challenging for collimated luminaries, since traditional diffusers cannot be employed without enlarging the exit aperture and reducing brightness (so increasing etendue). Furthermore, diffusers compromise the light output ratio (efficiency) of the lamps to which they are applied. A solution, based on Kohler integration, consisting of a spherical cap comprising spherical microlenses on both its interior and exterior sides was presen ted in 2012. When placed on top of an inhomogeneous multichip Lambertian LED, this so-called Shell-Mixer creates a homogeneous (both spatially and angularly) virtual source, also Lambertian, where the images of the chips merge. The virtual source is located at the same position with essentially the same size of the original source. The diameter of this optics wa s 3 times that of the chip-array footprint. In this work, we present a new version of the Shell-Mixer, based on the Edge Ray Principle, where neither the overall shape of the cap nor the surfaces of the lenses are constrai ned to spheres or rotational Cartesian ovals. This new Shell-Mixer is freeform, only twice as large as the original chip-array and equals the original model in terms of brightness, color uniformity and efficiency. Keywords: LEDs, Color Mixing, Freeform, Kohler integration, Etendue, Illumination" @default.
- W2196365557 created "2016-06-24" @default.
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- W2196365557 date "2015-09-23" @default.
- W2196365557 modified "2023-09-26" @default.
- W2196365557 title "Freeform étendue-preserving optics for light and color mixing" @default.
- W2196365557 cites W2022012467 @default.
- W2196365557 doi "https://doi.org/10.1117/12.2191048" @default.
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