LED high-beam headlamp based on free-form microlenses

Area of Science:

• Optics
• Automotive Engineering
• Illumination Technology

Background:

• White LED sources in motorcar headlamps can exhibit rainbow phenomena due to optical dispersion in thick lenses.
• This chromatic aberration affects visual quality and regulatory compliance for automotive lighting.

Purpose of the Study:

• To propose and validate a novel LED high-beam headlamp design using free-form microlenses.
• To eliminate the rainbow phenomenon in automotive headlamps caused by LED light dispersion.
• To ensure compliance with ECE Regulation R112 for illumination patterns.

Main Methods:

• Design of free-form microlenses incorporating total reflection surfaces for beam collimation.
• Integration of microlens structures for redistributing collimated beams to the target illumination plane.
• Optimization of the source-to-plane mapping based on ECE R112 standards.
• Validation through optical simulations and experimental testing.

Main Results:

• The proposed free-form microlenses efficiently collimate and redistribute light from LED sources.
• The designed headlamp system meets all illumination requirements specified by ECE Regulation R112.
• A significant reduction in the light pattern dispersion, minimizing the rainbow effect, was observed.

Conclusions:

• Free-form microlenses offer an effective solution to mitigate chromatic dispersion in LED automotive headlamps.
• The developed technology ensures high-quality illumination patterns compliant with international automotive lighting regulations.
• This approach enhances visual performance and safety in motorcar headlamps.