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Proceedings Article

High efficiency 90° elbow for light guides

[+] Author Affiliations
Daniel Vazquez-Molini, Antonio Alvarez Fernandez-Balbuena, Berta Garcia-Fernandez, Eusebio Bernabeu

Univ. Complutense de Madrid (Spain)

Proc. SPIE 7059, Nonimaging Optics and Efficient Illumination Systems V, 70590S (September 11, 2008); doi:10.1117/12.796153
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From Conference Volume 7059

  • Nonimaging Optics and Efficient Illumination Systems V
  • Roland Winston; R. John Koshel
  • San Diego, California, USA | August 10, 2008

abstract

Transmission of light through a 90 degrees elbow in a hollow light guide is an important step in the development of natural lighting applications. In this paper we present a new design that has more than 260% higher efficiency in flux transfer than a standard bending system for hollow and aluminum light guides. The clue of this new system is to minimize the light angle at the output of the elbow, in such way that it is possible to guide light at higher distances because of the fewer reflections in the light guide. The system works properly for prismatic light guides but is also suitable for aluminum guides where the reduction of reflections permit the use of cheaper aluminum or the increase in length maintaining flux transfer. Also this reduction of reflections in aluminum light guide derives in less change of chromatic coordinates.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Topics

Waveguides ; Aluminum
Citation

Daniel Vazquez-Molini ; Antonio Alvarez Fernandez-Balbuena ; Berta Garcia-Fernandez and Eusebio Bernabeu
"High efficiency 90° elbow for light guides", Proc. SPIE 7059, Nonimaging Optics and Efficient Illumination Systems V, 70590S (September 11, 2008); doi:10.1117/12.796153; http://dx.doi.org/10.1117/12.796153


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