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Scaling of the LED collimators with folded multiple reflections

: Kudaev, S.; Schreiber, P.


Winston, R. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nonimaging Optics and Efficient Illumination Systems V : August 2008, San Diego, CA, USA
Bellingham, WA: SPIE, 2008 (SPIE Proceedings Series 7059)
ISBN: 978-0-8194-7279-3
ISSN: 0277-786X
Paper 70590C
Conference "Nonimaging Optics and Efficient Illumination Systems" <5, 2008, San Diego/Calif.>
Conference Paper
Fraunhofer IOF ()
non-imaging optic; LED colimator; Bezier spline; etendue conservation

We investigate the parametrical scaling of LED collimators with folded multiple reflections, described by rational Bezier spline. One can scale the collimator linearly with source size (maintaining residual divergence). Scaling factor should be calculated from etendue conservation if one needs to scale the collimator for a different residual divergence. Both up- and downscaling the collimator (reducing the collimator diameter to obtain the design with larger divergence and vice versa) are considered. Concentrator shape cannot be linearly scaled if we change the material (for example polycarbonate is used in design instead of PMMA). Method allows rapid development of collimating optics.