초점거리에 따른 배광분석 및 색수차 분석을 통한 자동차용 LED 헤드램프의 성능향상에 관한 연구

다국어 초록 (Multilingual Abstract)

LED as a light source is making big changes in automotive lighting field. The optical system has been changed to adopt a LED. For example in the engineering field, we have used a heatsink and FAN to dissipate a heat in the LED optical system. Before we have used a LED, we had just adopted a natural convection instead of forced convections.
And also style of headlamp has a big change. Normally headlamp has a big circle image to express an eye of vehicle. But now, LED headlamps express their own design characteristic by using different looks.
LED gives us many chances to use putting plastic materials into the headlamps. One of big chances is a temperature in the system. Before using LED, traditional light sources has high temperature. That is why we have to use a glass to make an optical lens into a optical system.
LED optical system could use a plastic lens. it means we can make almost all kinds of shapes through the plastic injection molding.
Already some car manufactures are adopting this technology into their design to express to all customer their own identity. Especially premium automotive companies.
To use this technology, we have to overcome a big defect to adopt this technology. That is a 'Color abberation' near the cut off line of low beam. First of all, I am looking forward to understand why we need this technology in automotive field. so I will describe main factors about the automotive optical system in this thesis. After that, I have to study what is the problem and find causes. Then, I will analyze and find a new solution.

목차 (Table of Contents)

• 제1장 서 론 ······························································ 1
• 1.1 연구배경 ··························································· 1
• 제2장 이론적 배경 ······················································ 3
• 2.1 자동차용 헤드램프의 구성 및 역할 ··························· 3
• 2.2 헤드램프 low beam 법규 ······································· 6
• 2.3 Low beam용 광학계 ·············································13
• 2.3.1 Multi faceted reflector (MFR) 광학계 ························ 13
• 2.3.2 Projection 광학계 ···············································15
• (1) 기본 원리 ··················································· 15
• (2) 비구면 렌즈의 특성 ········································ 17
• 2.4 헤드램프 시장의 새로운 패러다임 ································· 18
• 제3장 실험 및 결과 분석 ·············································· 20
• 3.1 색수차 발생 원인 ················································ 20
• 3.1.1 벤치마킹을 통한 LED 헤드램프의 색수차 확인 ········ 20
• 3.1.2 색수차 발생 원인 분석 ····································· 21
• 3.2 설계 및 시뮬레이션 계획 ······································· 25
• 3.2.1 컬러시뮬레이션을 통한 렌즈 재질별 색수차 확인 ············ 30
• 3.2.2 색수차 영향도 판정기준 수립 ··································31
• 3.2.3 초점 위치에 따른 색수차, 배광 영향도 분석 ················· 35
• 3.2.3.1 Glass 렌즈의 색수차 및 배광 영향도 분석 ··············35
• 3.2.3.2 PMMA렌즈의 색수차 및 배광 영향도 분석 ············· 40
• 3.2.4 LED color bin 영향도 분석 ····································42
• 제 4장 결론 ······························································ 45
• 참고문헌 ·································································· 49