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Memorias de investigación
Communications at congresses:
Freeform étendue-preserving optics for light and color mixing
Year:2015
Research Areas
  • Engineering
Information
Abstract
Today?s 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 étendue). Furthermore, diffusers compromise the light output ratio (efficiency) of the lamps to which they are applied. A solution, based on Köhler integration, consisting of a spherical cap comprising spherical microlenses on both its interior and exterior sides was presented 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 was 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 constrained 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.
International
Si
Congress
Illumination Optics IV. Optical Systems Design 2015
960
Place
Reviewers
Si
ISBN/ISSN
9781628418187
Start Date
07/09/2015
End Date
10/09/2015
From page
1
To page
12
Optical Systems Design 2015. Proc. SPIE 9629
Participants
  • Autor: Juan Carlos Miñano Dominguez (UPM)
  • Autor: Pablo Benitez Gimenez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería Óptica
  • Departamento: Electrónica Física
  • Centro o Instituto I+D+i: Centro de Domótica Integral, CEDINT
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