Asymmetrical Reflector and Segmented Housing for LED Thermal Management
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Solution Overview
Problem
LED lighting systems face issues with glare and thermal management, and sensors in outdoor lighting fixtures are prone to damage due to exposure, especially in areas with vehicle activity.
Innovation Solution
A lighting apparatus with a thermally conductive housing assembly that separates thermal energy management between electrical components and light sources, using a reflector to redirect light and an asymmetrical reflector design to minimize glare, and recessing sensors within the housing to protect them from external damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are used as light sources, then energy efficiency is improved, but thermal management challenges worsen due to nontrivial heat generation
Solution Approach 1:
The lighting apparatus is divided into separate housing assemblies: a first housing assembly containing electrical components and a second housing assembly containing light sources. This segmentation allows independent thermal management for each component type, with each housing equipped with its own heat dissipation structures.
Solution Approach 2:
A reflector positioned between the housing assemblies serves as an intermediary structure that facilitates thermal management while enabling light redirection. The reflector housing provides additional thermal pathways and structural separation between heat-generating components.
2Ease of operation
If sensors are positioned outside the housing for operation, then sensing functionality is improved, but sensor damage risk worsens due to exposure to environmental hazards
Solution Approach 1:
The sensor is nested within the housing assembly, specifically positioned inside the first housing assembly. This nested configuration protects the sensor from environmental damage while maintaining its operational functionality through strategic positioning and light path design.
Solution Approach 2:
The housing assembly acts as an intermediary protective structure between the sensor and external environmental hazards. The housing provides physical protection while allowing the sensor to perform its function through controlled light access.
3Use of energy by moving object
If all light is directed downwards for efficient illumination, then illumination efficiency is improved, but cave effect worsens due to lack of upward light
Solution Approach 1:
The reflector employs an asymmetrical design with different surface characteristics: a first surface facing the light sources and a second surface facing away. This asymmetry enables selective light redirection, allowing the system to maintain downward illumination efficiency while also directing some light upward to mitigate cave effect.
Solution Approach 2:
Different portions of the reflector surfaces are designed with different optical properties to perform different functions: one surface optimizes downward light redirection for illumination efficiency, while another surface directs upward light to prevent cave effect, creating local quality variations across the reflector structure.
4Device complexity
If electrical components are housed together with light sources for compactness, then device complexity is reduced, but thermal management worsens due to direct thermal contact
Solution Approach 1:
The housing structure is segmented into distinct first and second housing assemblies that are thermally isolated from each other. Electrical components are housed in the first assembly while light sources are housed in the second assembly, preventing direct thermal contact and enabling independent thermal management for each component type.
Solution Approach 2:
The light sources are extracted from the electrical component housing and placed in a separate second housing assembly. This extraction eliminates direct thermal contact between electrical components and light sources, allowing each to be managed thermally independently while maintaining overall system compactness.
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 glare and enhances thermal management, ensuring efficient heat dissipation and protecting sensors from environmental hazards while maintaining operational functionality.
Implementation Method 1
a reflector positioned within the housing. At least one light source is positioned within the housing and configured to emit light towards the reflector
Implementation Method 2
a first housing assembly formed from a thermally conductive material and a second housing assembly formed of a thermally conductive material. At least one electrical component is positioned within the first housing assembly and the at least one electrical component is in thermally conductive contact with the first housing assembly
Data Source
AI summary
A lighting apparatus is provided with a first housing assembly formed from a thermally conductive material and a second housing assembly formed of a thermally conductive material. At least one electrical component is positioned within the first housing assembly and the at least one electrical component is in thermally conductive contact with the first housing assembly. At least one light source is in thermally conductive contact with the second housing assembly. The second housing assembly is not in thermally conductive contact with the first housing assembly, such that thermal energy from the first housing assembly does not directly transfer to the second housing assembly.