LED beam shaping lens based on the near-field illumination

Joo, Jae Young; Kang, Chang Seog; Park, Soon Sub; Lee, Sun-Kyu

doi:10.1364/oe.17.023449

Cited by 29 publications

(24 citation statements)

References 12 publications

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“…near-field and far-field [9][10][11]. Moreno et al pointed out that in the far-field condition, the light source can be considered as a point; while in the near-field condition, the light source should be considered as an extended area.…”

Section: Introductionmentioning

confidence: 99%

Robustness of point light source approximation in lens design for light-emitting diode packages

Qiu

Zhao

Liu

et al. 2012

2012 13th International Conference on Electronic Packaging Technology &Amp; High Density Packaging

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In this study, we examined the robustness of point light source approximation in lens design for light-emitting diode (LED) packages by Monte Carlo ray-tracing simulations. We modeled three representative freeform lenses first, and then simulated the lighting performance while changing the lensto-chip size ratio (LCR). It is found that with the decrease of LCR, the lighting performances of the three lenses are deteriorated and the illuminance uniformities are decreased. It is concluded that the robustness of point light source approximation in lens design is dependent on the lens and challenged for extended light source, especially for compact lens.

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Section: Introductionmentioning

confidence: 99%

Robustness of point light source approximation in lens design for light-emitting diode packages

Qiu

Zhao

Liu

et al. 2012

2012 13th International Conference on Electronic Packaging Technology &Amp; High Density Packaging

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“…The use of ray files to model optical characteristics of a light source allows for accurate simulations of the luminous intensity distributions of luminaires because the interaction with optical components in the near field is taken into account 3,4 . Ray files are constructed by measuring the near field of the light source using a near field goniophotometer 5,6 .…”

Section: Introductionmentioning

confidence: 99%

“…However, the use of ray files to model the near field of the source is absolutely essential whenever optics are situated close to the source, which is almost always the case when using the popular LED sources 3,4 . Several solutions are conceivable to circumvent this issue.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of a brute-force ray tracing approach to obtain luminance maps of luminaires modeled with ray files

Audenaert¹,

Durinck²,

Vandeghinste³

et al. 2010

SPIE Proceedings

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The use of a ray file to model the optical characteristics of a light source is a well-known and popular method to achieve accurate results when simulating luminous intensity distributions of luminaires, especially if the source is interacting with optical components at a close distance. However, lighting industry becomes more and more interested in the spatial luminance distribution of the luminaire itself. Luminance maps offer a tool to predict the degree of discomfort glare early in the design process, especially when developing fixtures using small and intense LED light sources. The generation of luminance maps is commonly based on the reverse ray tracing technique, requiring one or more surfaces to be defined as light sources. However, ray files can not be considered as surface sources, but as a collection of ray data that model the near field of a light source. Despite the fact that ray files are constructed from experimental data they do not explicitly contain the geometry of the light source. This excludes the use of reverse ray tracing. For this reason the implementation of brute force forward ray tracing to obtain luminance maps was investigated. To be able to compare the results of both techniques an inhomogeneous surface source was defined. Luminance maps were then generated using both the brute force ray tracing approach and the conventional reverse ray tracing approach. A good agreement was obtained. A reduction in simulation time was achieved by parallel ray tracing computation and digital enhancement techniques.

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“…SRGs play an important role in diffractive optical elements (DOEs) such as spectrometer, monochromator and multiple imaging devices [1][2][3][4][5][6]. Keeping …”

Section: Introductionmentioning

confidence: 99%

Fast atom beam-based fabrication of high-efficienct blazed grating using slanting angle control of a substrate

Lee

Hane

Lee

2010

2010 International Conference on Optical MEMS and Nanophotonics

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This paper presents electromagnetic analysis of Sibased small period blazed reflection gratings for a period of 0.6 -1.5 in terms of the rigorous coupled wave analysis (RCWA) and its fabrication using fast atom beam (FAB) etching method. The optimized blazed gratings were successfully fabricated on a slanted silicon substrate by FAB etching method, and diffraction efficiencies (DE) for four kinds of gratings were evaluated from optical testing and these results showed good agreement with these theoretical values, respectively.

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LED beam shaping lens based on the near-field illumination

Cited by 29 publications

References 12 publications

Robustness of point light source approximation in lens design for light-emitting diode packages

Robustness of point light source approximation in lens design for light-emitting diode packages

Feasibility study of a brute-force ray tracing approach to obtain luminance maps of luminaires modeled with ray files

Fast atom beam-based fabrication of high-efficienct blazed grating using slanting angle control of a substrate

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