LED Lighting Device with Integrated Thermal and Optical Housing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lighting technologies, such as incandescent and fluorescent bulbs, are inefficient in terms of energy usage and have short lifespans, while solid state light emitters like LEDs offer improved efficiency and longevity but struggle with color rendering index (CRI) and require complex designs with multiple subassemblies.
Innovation Solution
A lighting device with solid state light emitters integrated directly into a housing that serves as both a thermal and optical solution, eliminating thermal interfaces and reducing complexity by mounting LEDs on a concave reflective surface with conductive tracks and optionally using luminescent materials to achieve efficient and long-lasting white light production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If solid state light emitters (LEDs) are used instead of incandescent or fluorescent bulbs, then energy efficiency and lifetime are improved, but color rendering index (CRI) deteriorates and device complexity increases due to need for multiple subassemblies
Solution Approach 1:
The patent combines multiple LED chips of different colors (red, green, blue) into a single integrated lighting device, allowing the system to achieve high CRI by emitting full-spectrum light while maintaining energy efficiency. This merging approach eliminates the need for separate color mixing subassemblies and directly addresses both energy efficiency and color rendering requirements
2Reliability
If multiple subassemblies are used to achieve white light with solid state emitters, then color rendering is improved, but device complexity increases
Solution Approach 1:
The patent integrates red, green, and blue LED chips into a single housing with a common reflective surface and thermal management system, reducing device complexity while maintaining high CRI. The multiple color channels are combined in one assembly rather than requiring separate subassemblies, directly resolving the contradiction between color rendering and complexity
Solution Approach 2:
The housing serves multiple functions simultaneously: it provides structural support, thermal management through heat sinks, optical reflection via the concave reflective surface, and mechanical mounting for all LED chips. This multi-functionality reduces the number of separate components needed, addressing the device complexity issue while maintaining color rendering performance
3Ease of manufacture
If conventional light bulbs are used, then ease of manufacture and initial cost are improved, but lifetime and energy efficiency deteriorate
Solution Approach 1:
The patent uses individual LED chips that can be manufactured separately and then mounted onto the housing, allowing for modular assembly. This segmentation enables easier manufacturing and replacement compared to traditional bulb assemblies, while the solid state nature of LEDs provides significantly extended lifetime compared to incandescent or fluorescent bulbs
4Temperature
If thermal interfaces are included in LED mounting, then heat dissipation is improved, but device complexity and cost increase
Solution Approach 1:
The patent integrates thermal management directly into the housing structure by mounting LED chips onto the concave reflective surface that is thermally coupled to heat sinks. This merging of thermal management into the housing eliminates separate thermal interface components, reducing device complexity and cost while maintaining effective heat dissipation
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 provides a highly energy-efficient, long-lasting lighting solution with improved CRI and reduced maintenance needs, maintaining at least 50% initial intensity after 50,000 hours of use, while simplifying the design and reducing costs.
Implementation Method 1
Light emitting diodes are semiconducting devices that emit light (ultraviolet, visible, or infrared) when a potential difference is applied across a p-n junction structure
Implementation Method 2
one or more luminescent materials (e.g., one or more phosphors)... a luminescent material that emits yellow light in response to excitation by light emitted by the light emitting diode
Implementation Method 3
The conductive tracks are positioned on at least a first portion of the housing on an inner concave reflective surface thereof
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A lighting device comprises, or consists essentially of, a housing, a solid state light emitter and conductive tracks. The conductive tracks are positioned on the housing and are coupleable with a power supply. The conductive tracks comprise a positive conductive track and a negative conductive track. Each of the solid state light emitters is in electrical contact with a positive conductive track and a negative conductive track. Another lighting device comprises a fixture and a solid state light emitter in which the fixture comprises conductive elements which are coupleable to at least one power supply and the solid state light emitter is mounted on the fixture. There is also provided a lighting device which provides light of an intensity which is at least 50 percent of its initial intensity after 50,000 hours of illumination.