Design of a newly projected light-emitting diode low-beam headlamp based on microlenses

Wang, Hong; Wang, Xiang; Li, Yang; Ge, Peng

doi:10.1364/ao.54.001794

Cited by 25 publications

(12 citation statements)

References 12 publications

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“…As a new type of light source, LEDs have the advantages of a small size and a long life, which can greatly improve the quality and effectiveness of vehicle lighting. 7–10…”

Section: Introductionmentioning

confidence: 99%

Design of a high-efficiency system with combined reflectors for a light-emitting diode front fog lamp

Yang

Liu

et al. 2020

Lighting Research & Technology

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This paper provides a design method for a light-emitting diode front fog lamp system based on a freeform surface and an improved quadric surface. First, a light-receiving reflector is used to converge the light-emitting diode beam to form an equivalent lighting point. Then, the relationship between the point and the light pattern on the work surface is calculated, and the freeform surface is constructed based on Snell’s law and non-imaging optical theory. Finally, two compensated reflectors are added at both ends of the freeform surface to reflect the unutilized light to achieve the compensation effect. By application of combined reflectors, the light pattern at the work surface 25 m away can satisfy the requirement of ECE R19 Revision 7. Also, this system has the advantages of small size and high efficiency because lens or prism groups are avoided. And the utilization of a compensated surface also increases light efficiency. Finally, a prototype model is tested, which also meets the regulatory requirements.

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“…As a new type of light source, LEDs have the advantages of a small size and a long life, which can greatly improve the quality and effectiveness of vehicle lighting. 7–10…”

Section: Introductionmentioning

confidence: 99%

Design of a high-efficiency system with combined reflectors for a light-emitting diode front fog lamp

Yang

Liu

et al. 2020

Lighting Research & Technology

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“…These high-contrast cutoff lines are applicable to cars [3][4][5][6][7][8][9], motorcycles [10], and even bicycles [11][12][13][14]. In general, most designs apply reflection [3,5,8], projection [6,7,10], and refraction [4,9] to produce a high-contrast cutoff line. By using a combination of various optical principles to design a freeform lens, Chen et al obtained a highly efficient head lamp to project a high-contrast cutoff line [4].…”

Section: Introductionmentioning

confidence: 99%

“…By using a combination of various optical principles to design a freeform lens, Chen et al obtained a highly efficient head lamp to project a high-contrast cutoff line [4]. Wang et al adopted reflector-lens sets to project a light pattern for a low-beam head lamp [7]. Wu et al used four reflectors and the parameter-optimization method to obtain a low-beam head lamp with an optical efficiency of 79% [8].…”

Section: Introductionmentioning

confidence: 99%

Design of a Bicycle Head Lamp Using an Atypical White Light-Emitting Diode with Separate Dies

Lin

Sun

et al. 2019

Crystals

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To the best of our knowledge, this is the first demonstration of a design for a bicycle head lamp with a high-contrast cutoff line using an atypical white light-emitting diode (LED) with two separate dies. The precise optical model was created by setting the weighting factor on the emitting surface. The downward reflector was designed and fabricated to produce a high-contrast cutoff line in both short- and long-axis orientations, but a yellowish outer pattern was observed. A modified two-color optical model was created to describe the yellowish patterns in both orientations and explain the yellowish effect. Such an effect was caused by the larger coverage area of the phosphor than that by the blue dies. To reduce the yellowish effect near the cutoff line, a specific phosphor area was blocked in the experiment. The yellowish effect was greatly reduced, and the contrast across the cutoff line was enhanced. The presented technology is useful for designing a high-contrast light pattern with such an atypical white LED.

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“…Therefore, subsequent studies have focused on the modulating function of low/high beams. In terms of light source choice, LED has been widely used as a lighting source in the auto lamp market, and a wave of using lasers as an illumination source has recently emerged [7][8][9][10][11][12][13][14]. Laser headlamps have most of the advantages of LED headlamps, such as fast response, low brightness attenuation, small size, low energy consumption, and durability.…”

Section: Introductionmentioning

confidence: 99%

Laser Headlamp with a Tunable Light Field

Tseng

Chen

et al. 2019

Energies

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This study developed an optical module for laser headlamps with a tunable light field. Laser headlamps have high and low beam lighting functions that are applied by changing the numbers of unit headlamps. For regulatory validation, we validated the project in accordance with the Regulation No. 112 of the Economic Commission for Europe (ECE) to determine whether the results meet the regulatory requirements or not. The proposed design increased the lighting distance by 2.14 times and decreased the size of the mechanism by 45% relative to the values for LED headlamps. High and low beam lighting functions were provided by the same laser sources.

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Design of a newly projected light-emitting diode low-beam headlamp based on microlenses

Cited by 25 publications

References 12 publications

Design of a high-efficiency system with combined reflectors for a light-emitting diode front fog lamp

Design of a high-efficiency system with combined reflectors for a light-emitting diode front fog lamp

Design of a Bicycle Head Lamp Using an Atypical White Light-Emitting Diode with Separate Dies

Laser Headlamp with a Tunable Light Field

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