中国国际汽车照明论坛(IFAL)

2025 IFAL
2025 IFAL 参会回执 Registration Form
3.2MB下载
2025 IFAL 邀请函 Invitation
2.72MB下载
2025 IFAL 摘要模板 Abstract Template
32.0KB下载
2025 IFAL 论文模板 Paper Template
182.5KB下载
2025 IFAL 版权转让同意书 Copyright Transfer Agreement
19.17KB下载

Modern Streamline Car Shapes - Challenges for the Optical Design of Signal Functions in Headlamps

Doris Boebel, Norbert Möller; Automotive Lighting, Germany


Keywords:       Headlamp styling, signal functions, photometry, visibility requirements



Introduction

The actual trend in the styling of cars shows a growing lengths and inclination of the outer lens of headlamps. Especially the inclination is contradictory to the requirements of signal lamps regarding several photometrical aspects. On one side the efficiency of the function is reduced by Fresnel losses in the outer lens and in additional inner lenses, if used. Also the requirements on the homogeneity of the day and night appearance are difficult to fulfill, if the dimension of the light emitting area parallel to the driving direction is getting longer in comparison to the “useful” dimension normal to driving direction. The main aspect discussed in this paper is the visibility of the signal functions. Especially the visibility requirements 45 degrees inboards are hard to fulfill if the inclination of the outer lens converges to this critical angle. In this paper principal limitations and optical solutions to direct the light 45 degrees inboard are shown as well as practical solutions to apply in headlamps.