Scholarlink

<p>Headlamps are essential for safe night driving, as they must provide sufficient brightness to illuminate the road while minimizing glare for other drivers. Designing low-beam optics is more complex than general lighting optics due to the need for a high-contrast cutoff line, with the brightest point positioned near its edge. This challenge becomes even greater when working with compact optical systems. In this paper, we propose a robust optical design to address this issue effectively. We develop low-beam optics for bicycle headlamps using a cylindrical lens array (CLA) combined with reflective optics to create a specialized light pattern. The CLA spreads the optical pattern horizontally to form the cutoff line; however, this alone does not ensure optimal performance. To overcome this limitation, we introduce a novel design principle: the light pattern generated by the reflector, before passing through the CLA, should be inverse-triangular or trapezoidal. This approach enables the CLA to shift the brightest point upward and closer to the cutoff line, solving a key challenge in previous designs.</p>

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Robust optical design of high-contrast vehicle headlamps with cylindrical lens array and inverted triangular beam pattern

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月25日

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  • Chi-Shou Wu,
  • Ivan Moreno,
  • Chieh-Hsun Liu,
  • Tsung-Hsun Yang,
  • Yeh-Wei Yu,
  • Ching-Cherng Sun

摘要

Headlamps are essential for safe night driving, as they must provide sufficient brightness to illuminate the road while minimizing glare for other drivers. Designing low-beam optics is more complex than general lighting optics due to the need for a high-contrast cutoff line, with the brightest point positioned near its edge. This challenge becomes even greater when working with compact optical systems. In this paper, we propose a robust optical design to address this issue effectively. We develop low-beam optics for bicycle headlamps using a cylindrical lens array (CLA) combined with reflective optics to create a specialized light pattern. The CLA spreads the optical pattern horizontally to form the cutoff line; however, this alone does not ensure optimal performance. To overcome this limitation, we introduce a novel design principle: the light pattern generated by the reflector, before passing through the CLA, should be inverse-triangular or trapezoidal. This approach enables the CLA to shift the brightest point upward and closer to the cutoff line, solving a key challenge in previous designs.