Vehicle Headlamp Laser Deflection for Cut-Off Line Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vehicle headlamps with laser modules cannot generate light distributions with a cut-off line, limiting their use to only high beam functions, as they fail to meet legal illuminance gradient requirements for low beam and dazzle-free high beam applications.
Innovation Solution
Incorporating a first deflection device with a limiting edge and a second deflection device, offset relative to the main radiation direction, to create a light distribution with a cut-off line, ensuring efficient use of luminous flux and compliance with legal illuminance gradients, while the second deflection device adapts the residual light to overlap and enhance the first partial distribution, achieving optimal illuminance and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single deflection device is used to generate light distribution, then the device complexity is low, but the ability to generate cut-off line and meet illuminance gradient requirements is insufficient
Solution Approach 1:
The patent divides the light distribution task into two segments: a first deflection device (with limiting edge) that generates the cut-off line by deflecting part of the laser beam, and a second deflection device that handles the remaining light share. This segmentation allows each device to specialize in specific functions, enabling cut-off line generation while maintaining manageable complexity through modular design.
2Use of energy by moving object
If the second share of light is not utilized, then the device complexity is low, but the luminous flux efficiency is poor
Solution Approach 1:
The patent ensures continuous useful action by utilizing both shares of light from the laser source. The first deflection device processes the first share to create the cut-off line, while the second deflection device processes the remaining second share, ensuring that no luminous flux is wasted and both contribute to the final light distribution, thereby maximizing luminous flux efficiency.
3Illumination intensity
If the second share of light is deflected to overlap with the first partial distribution, then the illuminance is increased, but the device complexity increases
Solution Approach 1:
The patent merges the first partial light distribution (with cut-off line) and the second partial light distribution (from the remaining share) into a unified light output. The second deflection device is positioned and configured so that its output overlaps with the first partial distribution, combining both light shares to achieve high illuminance while maintaining the cut-off line structure through coordinated deflection of both shares.
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
Enables the generation of light distributions with cut-off lines that meet legal requirements, providing efficient and adaptive high beam and low beam functions without dazzling oncoming traffic, while optimizing the use of luminous flux.
Implementation Method 1
a laser light source for the radiation of a laser light beam
Implementation Method 2
an optic unit with a deflecting reflector is provided, by means of which a given light distribution is generated
Data Source
AI summary
A headlamp for vehicles with a laser module comprising a laser light source for the radiation of a laser light beam, and an optic unit to shape the laser light beam to form a given light distribution. The optic unit has a primary optic device for the imaging of an intermediate image on an intermediate image plane. The optic unit has a deflection device which is arranged in an intermediate image plane and which has a limiting edge by means of which a share of the light of the laser light beam is deflected along a light path in the direction of a bundling device, by means of which the share of light is deflected into a light distribution while forming a cut-off line.