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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 20 — Sep. 28, 2009
  • pp: 17916–17927

Elimination of flux loss by optimizing the groove angle in modified Fresnel lens to increase illuminance uniformity, color uniformity and flux efficiency in LED illumination

Byungwook Kim, Minseok Choi, Hokwan Kim, Jiseok Lim, and Shinill Kang  »View Author Affiliations

Optics Express, Vol. 17, Issue 20, pp. 17916-17927 (2009)

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A Fresnel lens is an optical component that can be used to create systems more compact, cost-effective, and lightweight than those using conventional continuous surface optics. However, Fresnel lenses can usually cause a loss of flux efficiency and non-uniform distribution of illuminance due to secondary refraction by surface discontinuities, especially along the groove facet. We therefore proposed to modify a groove angle in the Fresnel lens and analyzed interrelation between the groove angle and multiple optical performances, such as flux efficiency and the uniformity of illuminance and color. The groove angle was optimized to maximize the uniformity and efficiency in the target viewing angle considering various weights of merit functions. Specifically, in our study, when the uniformity of illuminance had a little more weight than the flux efficiency (ratio of 0.6:0.4), final optimum groove angles of 24.7°, 29.4°, and 31.3° were obtained at target viewing angles of 20°, 30°, and 40°, respectively. We also fabricated a modified Fresnel lens with a groove angle of 29.4° using UV-imprinting. The real optical performance of the fabricated Fresnel lens was then compared to that of a spherical lens.

© 2009 OSA

OCIS Codes
(080.3630) Geometric optics : Lenses
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.3670) Optical devices : Light-emitting diodes
(220.2945) Optical design and fabrication : Illumination design
(080.4225) Geometric optics : Nonspherical lens design

Original Manuscript: July 28, 2009
Revised Manuscript: September 18, 2009
Manuscript Accepted: September 18, 2009
Published: September 22, 2009

Byungwook Kim, Minseok Choi, Hokwan Kim, Jiseok Lim, and Shinill Kang, "Elimination of flux loss by optimizing the groove angle in modified Fresnel lens to increase illuminance uniformity, color uniformity and flux efficiency in LED illumination," Opt. Express 17, 17916-17927 (2009)

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