高功率LED車前燈電腦輔助模擬設計分析

Optical Design and Simulation for High Power LED Headlight

陳定楷(Ding-Kai Chen)

指導教授 ： 章明 ； 謝啟堂

中原大學/工學院/機械工程學系/碩士(2007年)

https://doi.org/10.6840/cycu200700814

摘要

本研究重點在探討以橢圓反射面內設置高功率LED光源組成車前燈系統之模擬與分析，此系統係利用組合式反射聚光發光元件、含反射裝置反射聚光發光元件等二種型式之發光元件組成，可投射出三種光型，將三種光型組合可產生近光燈之光型，以達到歐洲法規ECE R112之標準。
設計方向係依循美國專利US6882110的設計概念，將近光燈光型分為明暗截止線區、集中照射區、擴散區三種光線投射區域，使用Lumileds所生產型號為LXHL-PW03之LuxeonTM III Portable白光LED光源，將LED光源置於橢圓反射面之第一焦點且位於光學軸上，其發散光線聚集通過第二焦點，進而利用聚光透鏡將光線匯聚，投射至25公尺外之屏幕上；其綜合設計出二種規格之橢圓反射面發光元件，並利用此種元件形成三種光線分佈圖型，以不同的光線投射強度調整二種發光元件的數量及投射角度，將設計成型的發光元件以光學軟體LightTools進行電腦輔助模擬，在光線追跡中產生光線分佈圖型，並對光線分佈圖型進行光型及照度之分析，逐步修正至符合歐洲法規ECE R112之規範。
模擬分析成果顯示現有設計在明暗截止線區無漏光的現象，其照度值接近法規中要求的0.7Lux；集中照射區之照度值大於30Lux；擴散區照度值平均約為20Lux，故已接近車前燈要求下之理想值並符合法規之要求。

關鍵字

明暗截止線 ； LED ； 光線分佈圖型 ； 光學軸 ； 橢圓反射面 ； 擴散區 ； 集中照射區

並列摘要

The aim of this research is to study the application of high power LED light source in elliptical reflector of vehicles headlight system and analyze the light distribution pattern. The headlight system is made up of elliptical reflector lamp unit and a reflecting device. Two different types of low- beam lights are used in this investigation to produce three light distribution pattern. The light distribution pattern conformed to the ECE Regulation Nos.112.
The design of headlight system use to produce the light pattern from the LED source is based on US patent US6882110. In this research, the light distribution pattern of low-beam has been divided into cut-off line, hot zone and diffusion region. LuxeonTM III portable white LED (LXHL-PW03) made by Lumileds is used as light source. The LED light source is placed at the first focus of the elliptical reflector. The light will reflect and converge at the second focal point. The light distribution pattern is diverged using another lens is used to diverge and allowed to fall on a screen placed at 25 meters from the second lens. The headlight system can produce different luminous intensity distribution to set the quantity and angle of lamp units in two types units that can produce three light distribution pattern. The headlight system use different quantity of light at different angle to produce three light distribution pattern from two types units. These lamp units use optical software Light Tools to simulate and analyze the light distribution pattern and its luminous intensity for reaching the ECE R112.

並列關鍵字

Optics Axis ； Light Distribution Pattern ； Hot Zone ； Diffusion Region ； Elliptical Reflector ； LED ； Cut-off Line

參考文獻

[19] M. J. Hayford, C. T. Walker, L. Brown, S. Chow, J. Faust, and A. Kruglyak, “LightTools Ver.5.3 Illumination Module User’s Guide,” Optical Research Associates, 2006.

[2] B. Stout, “Development Implementation of Side-Emitting LEDS in Exterior Automotive Signal Lighting Applications,” SAE Tech. PaperNo.2004-01-0221.

[8] A. Schuster, “An Introduction to the Theory of Optics,” Edward Arnold, 1904.

[10] S. Chandrasekhar, “Radiative Transfer,” Courier Dover Publications, p.20, 1960.

[15] “Proposed Amendments to ECE Regulations Nos.112,” Informal Document No. GRE-53-04, 2004.