Vehicle Projection Headlight Light Guide Optical Design
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Solution Overview
Problem
Conventional projection headlights for vehicles face limitations in utilizing luminous flux due to indirect light deflection by reflectors, resulting in reduced luminous flux and increased production effort and installation space required for secondary optical units composed of multiple lens elements.
Innovation Solution
The primary optical units of the lighting units are designed as light guide elements, combining partial luminous flux into a single light channel imaged by a secondary optical unit, such as a converging lens, to generate different sub-light distributions that superimpose to form the desired light distribution, reducing manufacturing and assembly tolerances and enhancing compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reflectors are used for indirect light deflection, then light direction can be controlled, but luminous flux utilization is reduced
Solution Approach 1:
The patent replaces the mechanical reflector system with an optical light guide system. Instead of using reflectors to indirectly deflect light, the invention uses light guides with optimized total internal reflection to directly guide and shape light, thereby improving luminous flux utilization while maintaining manufacturing feasibility
Solution Approach 2:
The patent changes the optical parameters by transitioning from reflector-based indirect light deflection to light guide-based direct light guidance. This parameter change optimizes the light path efficiency and luminous flux utilization through precise control of total internal reflection angles and light guide geometry
2Manufacturing precision
If secondary optical units consist of several lens elements, then optical precision can be improved, but production effort and installation space increase
Solution Approach 1:
The patent merges multiple lens elements into a single integrated light guide component. By combining the functions of multiple lenses into one monolithic light guide structure, the invention reduces the number of components, simplifies assembly, and decreases installation space while maintaining optical precision through optimized internal light guidance pathways
Solution Approach 2:
The light guide serves multiple functions simultaneously: it acts as both the primary optical element for light shaping and the secondary optical unit for focusing. This multi-functionality eliminates the need for separate lens elements, reducing device complexity while maintaining optical precision
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
This approach allows for the generation of high luminous efficacy with minimal manufacturing and assembly tolerances, resulting in a compact and bright projection headlight with reduced production costs and precise light decoupling.
Implementation Method 1
The primary optical units of the lighting units, which are designed as light guide elements
Implementation Method 2
a secondary optical unit, in particular a lens (single lens), which is upstream of the first and second lighting units
Data Source
AI summary
A projection headlight for vehicles, having a first lighting unit containing a light source and a primary optical unit for pre-shaping light exiting the light source, a second lighting unit containing a light source and a primary optical unit for pre-shaping the light exiting the light source, a secondary optical unit for imaging the light exiting the primary optical unit of the first lighting unit in a region in front of the vehicle as a first light distribution and light exiting the primary optical unit of the second lighting unit as a second light distribution, an actuator for actuating the first lighting unit and the second lighting unit in order to generate the light distribution consisting of the first light distribution and the second light distribution, a diaphragm with a diaphragm edge for producing a light-dark boundary in the first light distribution.