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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 3 — Jan. 31, 2011
  • pp: 1794–1807

Reverse functional design of discontinuous refractive optics using an extended light source for flat illuminance distributions and high color uniformity

Byungwook Kim, Hokwan Kim, and Shinill Kang  »View Author Affiliations


Optics Express, Vol. 19, Issue 3, pp. 1794-1807 (2011)
http://dx.doi.org/10.1364/OE.19.001794


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Abstract

We propose a reverse functional design of modified Fresnel lens (MFL) with discontinuous refractive surfaces to achieve cost-effective high optical performance with thin lenses. The reverse-geometry design process was optimized to control the spatial illuminance distribution (SID) of light-emitting diodes (LEDs). Analysis results based on non-sequential ray-tracing simulations for flat SIDs indicated that the illuminance uniformity of LEDs with optimum MFL with different groove angles increased about 22 times, from 0.348 to 0.016, compared with the normalized standard deviation (NSD) of the general Fresnel lenses (GFL) with groove angles of 0°. In addition, the proposed method enhanced the color uniformity by reducing the circular yellow pattern. Tolerance analysis was carried out to determine tolerance limits for applying the optimum MFL in the assembly process. Finally, the feasibility of the reverse design process was verified by optical measurements of the optimum MFL.

© 2011 OSA

OCIS Codes
(220.2740) Optical design and fabrication : Geometric optical design
(230.3670) Optical devices : Light-emitting diodes
(220.2945) Optical design and fabrication : Illumination design
(080.4225) Geometric optics : Nonspherical lens design

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: December 3, 2010
Revised Manuscript: January 13, 2011
Manuscript Accepted: January 13, 2011
Published: January 14, 2011

Citation
Byungwook Kim, Hokwan Kim, and Shinill Kang, "Reverse functional design of discontinuous refractive optics using an extended light source for flat illuminance distributions and high color uniformity," Opt. Express 19, 1794-1807 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-3-1794


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