Vehicle Headlamp Light Guide Bundling for Uniform Coupling
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Solution Overview
Problem
Existing illumination devices struggle to efficiently couple and distribute light into and across light radiation bodies, resulting in uneven light distribution.
Innovation Solution
A bundling device is used to redirect light from the light output section of the light guide onto a narrower free surface of the light radiation body, utilizing a shell-like structure with tapered ends and metallized inner surfaces to deflect light, combined with light deflection elements to achieve homogeneous light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the free surface width is made smaller than the light output section diameter, then the illumination device achieves a more compact structure, but light coupling efficiency deteriorates due to light loss
Solution Approach 1:
The bundling device acts as an intermediary optical element between the light output section and the free surface. It captures light that would otherwise be lost due to the size mismatch and redirects it onto the free surface, thereby maintaining high coupling efficiency while enabling a compact structure.
Solution Approach 2:
The bundling device changes the spatial parameters of light propagation by collecting divergent light from the light output section and redirecting it onto the smaller free surface. This parameter transformation enables efficient light coupling despite the size difference between the light output section and free surface.
2Volume of moving object
If the free surface width is made smaller than the light output section diameter, then the illumination device achieves a more compact structure, but light distribution uniformity deteriorates
Solution Approach 1:
The bundling device creates local quality variation in light distribution by directing different portions of light from the light output section to different regions of the free surface. This localized light redirection ensures uniform overall distribution while maintaining the compact structure.
3Loss of energy
If a bundling device is added to redirect light onto the free surface, then light coupling efficiency is improved, but device complexity increases
Solution Approach 1:
The bundling device is implemented as a thin-walled shell structure that is simple in form but effective in function. This shell geometry provides the necessary light redirection capability while adding minimal structural complexity to the overall device.
4Manufacturing precision
If the bundling device is formed as a shell with tapered end portions, then light distribution uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The bundling device employs a shell geometry with tapered end portions that create smooth curved transitions for light redirection. This curved geometry improves light distribution uniformity by providing gradual angle changes, while the simple shell form remains relatively easy to manufacture using standard forming processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures efficient and uniform light coupling and distribution onto the free surface of the light radiation body, enhancing the illumination device's performance.
Implementation Method 1
the bundling device is formed as a shell which encloses the light output section of the at least one light guide on the side opposite the free surface and has end portions tapering towards the free surface, wherein an inner surface of the bundling device is white or metallized for deflection of light
Implementation Method 2
at least one light guide comprising a light input section and a light output section, wherein the light input section is configured to input light of at least one light source into the light guide
Implementation Method 3
the light radiation body further comprises a light radiation surface configured to radiate light coupled into the light radiation body via the free surface out of the light radiation body in front of the illumination device
Data Source
Figure 1~2
Figure 3~5
AI summary
Illumination device (10) for a vehicle headlamp, the illumination device comprising: - at least one light guide (100) comprising a light input section (110) and a light output section (120), - a light radiation body (200) comprising a free surface (220), wherein the light coupling out of the at least one light guide (100) can be coupled into the light radiation body (200) via the free surface (220), wherein light from at least one light source (50) can be radiated in front of the illumination device (10) via the light radiation body (200), wherein the illumination device (10) comprises a bundling device (300) configured to bundle and direct the light, which is coupled out from the light output section (120) of the at least one light guide (100), onto the free surface (220) of the light radiation body (200), so that light which is coupled out of the light output section (120) of the at least one light guide (100) and would not reach the free surface (220) due to a smaller width (W) of the free surface (220) compared to a diameter (D) of the light output section (120) of the at least one light guide (100), is deflected onto the free surface (220).