Design of a high-efficiency train headlamp with low power consumption using dual half-parabolic aluminized reflectors

Liang, Wei-Lun; Su, Guo-Dung John

doi:10.1364/ao.57.001305

Cited by 7 publications

(2 citation statements)

References 22 publications

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“…Such properties enable pcW-LEDs suitable for vehicle forward lighting for trains, cars, trucks, motorcycles, and bicycles. [16][17][18][19][20][21][22][23] The vehicle forward light, which is also called the headlamp, is used to illuminate all objects on the roadway for a driver. The headlamp must provide sufficient illumination to the objects while avoiding inducing glare to the drivers or pedestrians on the roadway.…”

Section: Introductionmentioning

confidence: 99%

Review of optical design for vehicle forward lighting based on white LEDs

Sun

Lin

et al. 2021

Opt. Eng.

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We introduce a current development in optical design for vehicle forward lighting based on solid-state lighting, in particular, phosphor-converted white LEDs. The vehicles include bicycles, bikes, and automobiles. Although the requirements regulating different vehicles are different, the low beam always requires a high-contrast cutoff line. Three optical design approaches are discussed; these include a projection lens incorporated with a baffle or beam shaper, multisegment reflectors, and complex lenses. A new design approach called light field management technology for the multisegment reflector is introduced. In addition, the possible related manufacturing errors and the robustness of different optical approaches are analyzed. Finally, we introduce three approaches to adaptive forward lighting that provide a driver with brighter and clearer vision without inducing glare to people on the roadway. The application of video projection technology to roadway illumination could be a trend of vehicle forward lighting based on solid-state lighting. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Introductionmentioning

confidence: 99%

Review of optical design for vehicle forward lighting based on white LEDs

Sun

Lin

et al. 2021

Opt. Eng.

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“…LEDs have gradually entered our lives due to their advantages of energy saving, high energy efficiency, long lifespan, and miniaturization [1,2]. In the past decade, LEDs have been used increasingly as light sources in automobile headlamps for their excellent properties [3][4][5][6]. Since low-beam requirements are completely different from those of high beams, the traditional optical systems of low and high beams in headlamps are designed separately, mainly including projection and reflection types.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Double Freeform Surface Lens for Integrated LED Automobile Headlamp

et al. 2021

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We propose a design method of asymmetric double freeform surface lens for an integrated LED automobile headlamp and develop an integrated LED automobile optical system. A single asymmetric double freeform surface lens is designed to redistribute rays emitting from the light source for realizing both low and high beams. Moreover, a freeform surface reflector is used to improve the energy efficiency of high beams. The prism placed in the optical path can suppress chromatic dispersion on the edge of the target plane. Simulation and experimental results show that the illumination values and color temperature of the key points can fully meet the requirements of United Nations Economic Commission for Europe vehicle regulations (ECE) R112, 48, and 128. The volume of the whole optical system comprised of freeform surface elements is smaller than that of the low beam system of a traditional headlamp, resulting in saved space, in which other electronic devices can be installed for the safety of the driver, which indicates that the proposed method is practical in the field of automobile lighting.

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GaN-based mini-LED matrix applied to multi-functional forward lighting

Nguyen

Lin

Sun

et al. 2022

Sci Rep

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In this paper, we propose and demonstrate to use of a single reflector with 68 segments to project vehicle low beam and high beam with the use of a GaN-based mini-LED matrix, which is a 5 × 6 LED die array. The design of the reflector is based on light field technology in considering etendue from the light source across the segments. The group of the segments with smaller etendue from the LED dies in the bottom 2 rows are used to project low beams. When the other LED dies are turned on, the reflector will project light upward and form the high beam. The selection of the turn-on LED dies in the mini-LED matrix can adjust the width of the illumination pattern so that an adaptive low/high beam can be performed. Besides, to extend the functionality of the headlamp module, we propose to dispense IR phosphor on LED dies in the high-beam zone of the GaN-based mini-LED matrix. Thus the vehicle can emit IR high beam, which can be imaged through a camera and can be incorporated with machine vision for an autonomous vehicle without using a complicated adaptive headlight to avoid glare. The proposed multi-function in spatial and spectral domains will be helpful to various applications with use of a mini-LED matrix.

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Design of a high-efficiency train headlamp with low power consumption using dual half-parabolic aluminized reflectors

Cited by 7 publications

References 22 publications

Review of optical design for vehicle forward lighting based on white LEDs

Review of optical design for vehicle forward lighting based on white LEDs

Asymmetric Double Freeform Surface Lens for Integrated LED Automobile Headlamp

GaN-based mini-LED matrix applied to multi-functional forward lighting

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