LED Automobile Lamp Thermal and Optical Design
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Solution Overview
Problem
LED automobile lamps face issues with homogeneity due to installation errors, inadequate heat dissipation leading to high operating junction temperatures, and suboptimal light distribution, which compromises their luminous efficacy, service life, and reliability.
Innovation Solution
The design incorporates a heat dissipation shell with a light-reflecting surface, a light source pillar, and a rear cover, featuring a light-shielding sheet, stepped planes, and guide positioning grooves to ensure proper mounting and heat dissipation, along with a light-reflecting surface composed of semi-reflecting surfaces and a transition surface, and heat dissipation fins for efficient thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional LED automobile lamp assembly processes are used, then production efficiency is maintained, but homogeneity of mass-produced products deteriorates due to fitting installation errors
Solution Approach 1:
The patent applies preliminary action by pre-designing the light source pillar with integrated positioning structures (stepped planes, guide positioning grooves, anti-deviation ribs) that automatically ensure correct installation position and attitude during assembly. This preliminary structural preparation eliminates the need for complex post-assembly calibration and ensures homogeneity of mass-produced products without increasing assembly process complexity
Solution Approach 2:
The light source pillar structure serves itself by incorporating built-in positioning and limiting features that automatically guide correct installation. The stepped planes and guide positioning grooves enable the component to self-align and self-position during assembly, eliminating the need for external adjustment mechanisms or complex installation procedures
2Reliability
If inadequate heat dissipation design is used, then device complexity is reduced, but operating junction temperature increases leading to reduced reliability
Solution Approach 1:
The heat dissipation structure is segmented into multiple functional components: the light source pillar with internal heat dissipation channels, the heat dissipation shell with external fins, and the stepped planes for thermal coupling. This segmentation allows heat to be dissipated through multiple pathways simultaneously, improving reliability without requiring overly complex single-structure solutions
Solution Approach 2:
The patent employs dimensionality change by transitioning from two-dimensional flat heat dissipation surfaces to three-dimensional stepped planes and external fins. The stepped planes create multiple thermal coupling surfaces between the LED and heat dissipation shell, while external fins increase the heat dissipation surface area in the vertical dimension, effectively lowering operating junction temperature
3Reliability
If poor light distribution design is used, then device complexity is reduced, but lighting safety and comfort deteriorate
Solution Approach 1:
The light-reflecting surface is designed with local quality variations, featuring different reflective properties in different regions. The semi-reflecting surfaces and transition surfaces are strategically positioned to control light distribution in specific directions, ensuring regulatory compliance and lighting comfort without requiring complex optical systems throughout the entire structure
Solution Approach 2:
The light-reflecting surface acts as an intermediary between the LED light source and the external environment. It mediates the light distribution by reflecting and redirecting light in controlled patterns through its specially designed semi-reflecting and transition surfaces, achieving safe and comfortable lighting without complex optical components
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 design ensures homogeneous mass-produced products with low operating junction temperatures, high luminous efficacy, long service life, and reliability, simplifying compliance with regulatory requirements for safe and comfortable lighting.
Implementation Method 1
The heat dissipation shell is internally mounted with a light-reflecting surface
Implementation Method 2
High luminous efficacy, long service life and high reliability of the LED, can all be expected in theory, however, these features are not guaranteed in practice and the LED may even display early failure because of a poor design for thermal conduction
Implementation Method 3
The outer surface of the heat dissipation shell is provided with a heat dissipation fin
Data Source
AI summary
An LED automobile lamp includes a lens, a heat dissipation shell, a light source pillar, and a rear cover. The heat dissipation shell is mounted with a light-reflecting surface, the light source pillar is mounted at the bottom of the heat dissipation shell, the lens is arranged at the top of the heat dissipation shell, and the rear cover is arranged at the bottom of the light source pillar. A first light source plate and a second light source plate are symmetrically arranged on two sides of the light source pillar. Both the first light source plate and the second light source plate extend into a light-reflecting region surrounded by the light-reflecting surface and the lens. The top of the light source pillar is provided with a light-shielding sheet, and a bottom of the light source pillar is provided with a stepped plane coupling with the heat dissipation shell.