Compact collimators designed with point approximation for light-emitting diodes

2016 ◽  
Vol 50 (2) ◽  
pp. 303-315
Author(s):  
T Luo ◽  
G Wang
Keyword(s):  
Design Method ◽  
Light Emitting Diode ◽  
Lens Design ◽  
Beam Angle ◽  
Optical Efficiency ◽  
Light Emitting ◽  
Chip Size ◽  
Practical Performance ◽  
Freeform Lens ◽  
Collimating Lens

We present a novel freeform lens design method for application to light-emitting diode collimating illumination. The lens is designed with a point-source assumption to form compact collimators. The method is derived from a basic geometric-optics analysis and the associated construction approach. By using this method, a compact collimating lenses with an aspect ratio = 0.181 is developed. With optimization of initial parameters, a highly collimating lens for a Cree XP-E LED (chip size: 1.2 mm × 1.2 mm) with an optical efficiency of 88.5% under a beam angle of ± 1.9° is constructed by simulation. To verify the practical performance of the lens, a prototype of the collimator lens is also made. This has light distribution compatible with the simulation results.

scholarly journals Design of Elliptic Reflective LED Surgical Shadowless Lamps Using Mathematical Optical Tracing Algorithms

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Cheng-Tang Pan ◽  
Yi-Chian Chen ◽  
Tsung-Lin Yang ◽  
Po-Hsun Lin ◽  
Po-Hung Lin ◽  
...  
Keyword(s):  
Elliptic Curves ◽  
Light Field ◽  
Light Emitting Diode ◽  
Heat Radiation ◽  
Halogen Lamp ◽  
Optical Efficiency ◽  
Light Emitting ◽  
Light Rays ◽  
Mathematical Algorithms ◽  
Freeform Lens

Traditional surgical shadowless halogen lamps are generally designed as projection type with many light bulbs, which can produce not only mercury pollution but also heat radiation that are serious problems to patient. The study utilized Runge-Kutta methods and mathematical algorithms to design and optimize the freeform lens. The LED (light-emitting diode) was adopted to replace the traditional halogen lamp. A uniform lens was designed and fabricated based on the energy conservation. At first, the light field of LED is concentrated through the freeform lens to improve the optical efficiency. Second, the three-shell elliptic curves are applied to the reflective surgical shadowless lamps, where only few LED chips are needed. Light rays emitting from different directions to the target plane can achieve the goal of shadowless. In this study, the LED’s luminance flux is 1,895 lm. The shadow dilution on the target plane is 54%.Ec(central illuminance) is 114,900 lux, and thed50/d10is 57% which is higher than the regulation by 7%, whereas the power consumption is only 20 W. The energy of reflective surgical shadowless lamps can save more than 50%, compared with the traditional projective one.

Freeform lens design for light-emitting diode uniform illumination by using a method of source–target luminous intensity mapping

2015 ◽  
Vol 54 (28) ◽  
pp. E146 ◽  
Author(s):  
Jin-Jia Chen ◽  
Ze-Yu Huang ◽  
Te-Shu Liu ◽  
Ming-Da Tsai ◽  
Kuang-Lung Huang
Keyword(s):  
Light Emitting Diode ◽  
Luminous Intensity ◽  
Lens Design ◽  
Uniform Illumination ◽  
Light Emitting ◽  
Intensity Mapping ◽  
Freeform Lens

A high-efficiency freeform reflector for a light-emitting diode low-beam headlamp

2016 ◽  
Vol 48 (8) ◽  
pp. 1005-1016 ◽  
Author(s):  
H Wu ◽  
XM Zhang ◽  
P Ge ◽  
JD Yu
Keyword(s):  
High Efficiency ◽  
Solid Angle ◽  
Light Emitting Diode ◽  
Practical Method ◽  
Optical Efficiency ◽  
Energy Redistribution ◽  
Light Emitting ◽  
Light Pattern ◽  
Different Types ◽  
Chip Size

A practical method is proposed for the design of a freeform reflector for light-emitting diode low-beam headlamps. The energy relationship between the solid angle of the light-emitting diode source and the target plane is first established. A freeform reflector is then constructed based on Snell's Law and the light energy redistribution maps are obtained by optimising meshing parameters on the target plane. By using this method, four reflectors are designed to constitute a module for the low-beam headlamp, and three different types of light-emitting diode sources are selected for simulation. Results demonstrate that the best light pattern can be obtained with the LUW HWQP light-emitting diode source whose chip size is 1.0 mm×1.0 mm, and the lighting distribution can fully satisfy the requirements of the ECE R112 regulations without any other lenses, shields or baffles. Furthermore, the optical efficiency can reach up to 79%.

Asymmetric freeform lens design for a light-emitting diode front fog lamp

2021 ◽  
Vol 60 (09) ◽  
Author(s):  
Shang-Ping Ying ◽  
Han-Kuei Fu ◽  
Hsin-Hsin Hsieh ◽  
Yong-Lin Chen
Keyword(s):  
Light Emitting Diode ◽  
Lens Design ◽  
Light Emitting ◽  
Freeform Lens

scholarly journals Design of a Secondary Freeform Lens of UV LED Mosquito-Trapping Lamp for Enhancing Trapping Efficiency

Crystals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 335 ◽  
Author(s):  
Wei-Hsiung Tseng ◽  
Diana Juan ◽  
Wei-Cheng Hsiao ◽  
Cheng-Han Chan ◽  
Hsin-Yi Ma ◽  
...  
Keyword(s):  
Light Intensity ◽  
Intensity Distribution ◽  
Light Emitting Diode ◽  
Trapping Efficiency ◽  
Axially Symmetric ◽  
Light Intensity Distribution ◽  
Light Emitting ◽  
Led Light ◽  
Uv Led ◽  
Freeform Lens

In this study, our proposed ultraviolet light-emitting diode (UV LED) mosquito-trapping lamp is designed to control diseases brought by insects such as mosquitoes. In order to enable the device to efficiently catch mosquitoes in a wider area, a secondary freeform lens (SFL) is designed for UV LED. The lens is mounted on a 3 W UV LED light bar as a mosquito-trapping lamp of the new UV LED light bar module to achieve axially symmetric light intensity distribution. The special SFL is used to enhance the trapping capabilities of the mosquito-trapping lamp. The results show that when the secondary freeform surface lens is applied to the experimental outdoor UV LED mosquito-trapping lamp, the trapping range can be expanded to 100π·m2 and the captured mosquitoes increased by about 300%.

Side-Emitting LED Lens Design for Generating Planar Lighting Source

2007 ◽  
Vol 364-366 ◽  
pp. 152-155
Author(s):  
Yi Ting Sun ◽  
Yu Nan Pao ◽  
T.H. Lin
Keyword(s):  
Horizontal Plane ◽  
Light Emitting Diode ◽  
Design Procedure ◽  
Normal Direction ◽  
Optical Simulation ◽  
Lens Design ◽  
Simulation Tool ◽  
Light Emitting ◽  
Led Light ◽  
Simulation Results

Side-emitting LED (Light emitting diode) modulation lens is proposed here for generating planar lighting source that can be applied in many fields like LCD backlight or general lighting. The light emitted form the LED light source will be modulated by the proposed lens by the mechanism of multi-refraction. The optical simulation tool ASAP was used during the design procedure. Optimal lens dimension was designed to module 70 percent of the emitting energy to the angle range from 70 degree to 110 degree, the angle was calculated from the normal direction of the LED horizontal plane to the direction of the emitting light. The lens prototype was also fabricated and the optical performance was measured to verify the simulation results. Finally, the comparison between the optical simulation and the experiment performances is also disclosed.

scholarly journals Luminous Intensity Field Optimization for Antiglare LED Desk Lamp without Second Optical Element

2020 ◽  
Vol 10 (7) ◽  
pp. 2607 ◽  
Author(s):  
Zhi-Ting Ye ◽  
Chieh Chang ◽  
Mao-Chieh Juan ◽  
Kuei-Jung Chen
Keyword(s):  
Light Emitting Diode ◽  
Optical Element ◽  
Spatial Effect ◽  
Experimental Results ◽  
Luminous Intensity ◽  
Beam Angle ◽  
Intensity Curve ◽  
Light Emitting ◽  
Human Eye ◽  
Intensity Field

This study proposes a model of a light module with an optimized luminous intensity field for realizing an antiglare light-emitting diode (LED) desk lamp without a second optical element. We simulated different luminous intensity field profiles to analyze the unified glare rating (UGR) and illumination uniformity performance of a desk lamp. The spatial effect of UGR and the illumination uniformity affect eye comfort. The light module was set to different beam angles without a second optical element, louver structure, and reflective element on the luminaire to compare different UGRs and uniformity values for evaluating human eye comfort. The simulation and experimental results indicated that the luminous intensity curve for a beam angle of 90° achieved an illumination uniformity of 80% and a UGR of 18.1 at a height of 45 cm, thus realizing a human-friendly antiglare desk lamp.

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