Motor Vehicle Projection Assembly Chromatic Aberration Adjustment
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Solution Overview
Problem
Chromatic aberrations in motor vehicle headlamp low-beam projection assemblies result in unsatisfactory visual quality and potential non-compliance with regulatory standards due to color issues, with blue or red fringing being problematic.
Innovation Solution
A projection assembly with a connecting system allowing translational movement between light source and convergent lens subassemblies to adjust the distance between them, ensuring minimal chromatic aberration and compliance with regulatory colorimetry criteria, using a locking mechanism and guidance systems to facilitate precise adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cut-off edge is positioned close to the blue focal point, then the visual quality of the beam is improved, but the intensity of blue color exceeds regulatory limits
Solution Approach 1:
The invention makes the optical system dynamic by enabling relative movement between the light source subassembly and lens subassembly along the optical axis. This allows the cut-off edge position to be adjusted dynamically to achieve optimal focus without excessive blue coloration, resolving the contradiction between visual quality and regulatory compliance
Solution Approach 2:
The invention changes the positional parameter of the light source or lens along the optical axis to optimize the focal point position. By adjusting this parameter, the system achieves sharp beam definition (improved visual quality) while positioning the focal point to avoid excessive blue coloration that would violate regulations
2Reliability
If the cut-off edge is positioned close to the red focal point, then regulatory compliance is improved, but the visual quality of the beam deteriorates
Solution Approach 1:
The adjustable optical system allows optimization of the cut-off edge position to achieve the best compromise between regulatory compliance and visual quality. The system can be dynamically positioned to meet red color limits while maintaining acceptable beam sharpness and visual appearance
3Adaptability or versatility
If a removable shield is used to form the cut-off, then the ability to switch between low beam and high beam is improved, but the chromatic aberration problem persists
Solution Approach 1:
Instead of using a static shield that causes chromatic aberration, the invention employs a dynamic optical adjustment mechanism. The relative movement between subassemblies allows the focal point to be optimized, eliminating chromatic aberration while maintaining dual-function capability through optical means rather than physical shields
4Illumination intensity
If sophisticated shields are used to correct chromatic aberration, then the visual quality is improved, but the device complexity and cost increase
Solution Approach 1:
The invention achieves chromatic aberration correction by changing the positional parameter of optical components rather than adding complex corrective shields. This simple parameter adjustment (distance between light source and lens) provides the same visual quality improvement without increasing device complexity or cost
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 effectively reduces chromatic aberration, improving the visual quality of the beam and ensuring compliance with lighting regulations by adjusting the cut-off edge to the accepted focal point, eliminating the need for sophisticated and expensive shields.
Implementation Method 1
the low beam is projected onto the road by a convergent lens that forms part of the projection assembly
Implementation Method 2
The chromatic aberration is generally due to the variation in the refractive index of the lens as a function of wavelength, which has the corollary effect that the focal point for the 'blue' wavelengths, known as the 'blue' focal point, is offset from the focal point for the 'red' wavelengths, known as the 'red focal point', along the optical axis
Implementation Method 3
the connecting system comprising a locking member able to move between a first position in which the first subassembly and second subassembly are immobile relative to one another
Implementation Method 4
allowing at least a translational movement of the first subassembly and of the second subassembly one relative to the other in a first direction parallel to the optical axis
Data Source
AI summary
An assembly for projecting a light beam includes a first sub-assembly for generating light rays, and a second sub-assembly comprising a converging lens. The first sub-assembly is arranged upstream of the second sub-assembly such that the light rays coming from the first sub-assembly are sent to the converging lens and such that the light rays emerging from the converging lens form the light beam. According to the invention, the projection assembly includes at least one connection system connecting the first sub-assembly to the second sub-assembly and allowing at least one translational movement of the first sub-assembly and the second sub-assembly relative to each other in a first longitudinal direction (X). Moreover, the connection system comprises a locking member that is movable between a first position in which the first sub-assembly and the second sub-assembly are motionless with respect to each other and a second position enabling the translational movement.