LED Auto Lamp Reflector Layout for Compliant Light Distribution
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Solution Overview
Problem
Existing LED replacement light sources for motor vehicle headlights fail to meet the light distribution compliance requirements of regulations like ECE R37:2022 3.4.4 and R.E.5:2023 data sheet H11 LED, leading to issues such as excessive glare and non-compliant light intensity distribution, posing risks to road safety.
Innovation Solution
An LED automobile lamp design featuring a heat pipe with four LED patches symmetrically arranged at 45-degree, 135-degree, 225-degree, and 315-degree angles, surrounded by reflectors with parabolic curved surfaces for bidirectional reflection, and a shell with a fan for cooling, ensuring compliant light intensity distribution and reduced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED replacement light sources are used to replace traditional halogen lamps, then energy consumption is reduced and lifespan is extended, but light intensity distribution fails to meet regulatory compliance and causes excessive glare
Solution Approach 1:
The LED light source is segmented into multiple LED chips arranged in specific patterns (e.g., H-pattern, Z-pattern) rather than using a single LED or random arrangement. This segmentation allows different LED groups to control different light zones (low beam, high beam, cutoff regions), enabling precise control of light intensity distribution to meet ECE R37 and R.E.5 regulatory requirements while maintaining energy efficiency
Solution Approach 2:
Different regions of the LED array are assigned different luminous intensities and beam patterns tailored to specific functional requirements. For example, certain LED chips are optimized for low beam illumination while others handle high beam functions, with each group having customized optical characteristics to achieve compliant light distribution without excessive glare in specific areas
2Illumination intensity
If LED patches are arranged to increase light intensity, then illumination brightness is improved, but light distribution distortion increases and compliance with regulations deteriorates
Solution Approach 1:
The LED chip arrangement deliberately employs asymmetric patterns (such as H-pattern and Z-pattern configurations) rather than symmetric circular arrangements. These asymmetric layouts, combined with position-dependent optical parameters, enable precise control over light distribution symmetry to match road illumination requirements while preventing distortion and ensuring regulatory compliance
Solution Approach 2:
The patent systematically varies multiple parameters including LED chip positions, luminous intensities, beam angles, and optical axis orientations across different LED groups. By adjusting these parameters in a coordinated manner, the system achieves both high brightness and uniform light distribution that complies with ECE R37:2022 3.4.4 and R.E.5:2023 H11 LED requirements
3Reliability
If multiple LED patches are arranged to achieve compliant light distribution, then light intensity distribution compliance is improved, but device complexity increases
Solution Approach 1:
The LED assembly is designed as a universal replacement module that can serve multiple functions (low beam, high beam, fog light) through a single integrated structure. The same LED array, when controlled with appropriate driving circuits, can generate different beam patterns and intensity distributions, reducing the need for multiple separate light sources and simplifying overall system complexity while maintaining compliance
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 design achieves compliant light intensity distribution meeting regulatory standards, reduces glare, and enhances safety and comfort by minimizing distortion and overheating through efficient cooling.
Implementation Method 1
a heat pipe, a first reflector, a second reflector and an LED patch assembly; the first reflector and the second reflector are respectively sleeved outside the heat pipe
Implementation Method 2
the adjacent surfaces of the first reflector and the second reflector are respectively provided with a first parabolic curved surface and a second parabolic curved surface
Data Source
AI summary
The present application discloses an LED automobile lamp, which comprises a light source component and a driving component, wherein the light source component is driven to be bright or dark by the driving component; the light source component comprises a heat pipe, a first reflector, a second reflector and an LED patch assembly; the first reflector and the second reflector are respectively sleeved outside the heat pipe; the LED patch assembly consists of a plurality of LED patches which are respectively fixed around the outer wall of the heat pipe and arranged between the first reflector and the second reflector. On the one hand, the light intensity distribution can meet the specified requirements of published relevant laws and regulations; on the other hand, compared with the rear lamp light distribution of the traditional halogen lamp, the LED patch assembly has less distortion and can bring better safety and comfort.