LED Lighting Fixture Heat Sink Pressure-Transfer Coupling
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Solution Overview
Problem
LED-based luminaires face challenges with thermal management, adhesive-related performance issues, and limited flexibility in design and maintenance due to thermal expansion mismatches and the need for mechanical fasteners, which affect heat dissipation and serviceability.
Innovation Solution
The use of pressure-transfer members between the LED assembly and the heat sink, along with a secondary optical facility, allows for mechanical and thermal coupling without adhesives, enabling improved heat dissipation and light extraction while facilitating disassembly and reassembly for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive materials are used to affix components to each other, then components can be securely attached, but gases are released during operation compromising performance and components cannot be separated for maintenance
Solution Approach 1:
The patent removes adhesive materials from the assembly process entirely. Instead of using adhesives to attach components, the design employs mechanical retention structures such as snap-fit connections, interlocking geometries, and friction-fit mechanisms that allow components to be securely attached without chemical bonding, thereby eliminating gas release issues while maintaining attachment reliability
Solution Approach 2:
The adhesive-based attachment system is replaced with reversible mechanical connections that enable components to be easily separated and reused. The mechanical retention structures allow for disassembly and reassembly without degradation, facilitating maintenance and component replacement while eliminating the need to discard entire assemblies when individual components fail
2Stability of the object's composition
If adhesive materials are used to secure components, then components remain fixed in position, but the entire assembly must be discarded when one component fails or needs replacement
Solution Approach 1:
The assembly is divided into modular components connected by independent mechanical retention structures. Each component can be separately accessed, removed, and replaced without affecting the integrity of other components. The segmentation allows for targeted maintenance where failing components can be replaced individually rather than discarding the entire assembly
Solution Approach 2:
The static adhesive bonding is replaced with dynamic mechanical connections that provide stable positioning during operation but allow for controlled separation during maintenance. The mechanical retention structures maintain component stability during normal operation while enabling easy disassembly when repair is needed, transitioning from a fixed to a controllable connection state
3Ease of manufacture
If conventional adhesive materials are used for component attachment, then assembly is simplified, but thermal expansion mismatch between components is not addressed
Solution Approach 1:
The patent applies different material properties to different regions of the assembly to accommodate thermal expansion differences. Mechanical retention structures are designed with specific geometric features and material selections that account for thermal mismatch, while adhesive materials are strategically placed only where thermal compatibility is achieved, eliminating adhesive use in regions with significant thermal expansion differences
4Ease of repair
If mechanical fasteners are used to secure components, then components can be attached and detached for maintenance, but assembly complexity increases
Solution Approach 1:
Multiple functions are combined into integrated retention structures that simultaneously provide mechanical attachment, alignment, and sealing functions. The design merges what would traditionally require separate fasteners, alignment features, and gaskets into unified components, reducing the number of discrete parts while maintaining ease of assembly and disassembly for maintenance
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 solution enhances heat dissipation, reduces operating temperatures, and simplifies serviceability and manufacturability by eliminating the need for adhesives and fasteners, allowing for continuous linear arrays without gaps in light emission.
Implementation Method 1
pressure-transfer members disposed between a secondary optical facility and an LED assembly for (i) retaining primary optical elements over corresponding LED light sources of the LED assembly and (ii) securing the LED assembly along with the primary optical elements against a heat sink of the apparatus under pressure exerted by the secondary optical facility
Implementation Method 2
securing the LED assembly along with the primary optical elements against a heat sink of the apparatus under pressure exerted by the secondary optical facility
Data Source
Figure 1A
Figure 1B~1C
Figure 1D~1E
AI summary
LED-based lighting apparatus (100) and assembly methods in which mechanical and/or thermal coupling between respective components is accomplished via a transfer of force from one component to another. In one example, a multipIe-LED assembly is disposed in thermal communication with a heat sink (120) that forms part of a housing (105). A primary optical element (170) situated within a pressure-transfer member (174) is disposed above and optically aligned with each LED (168). A shared secondary optical facility (130) forming another part of the housing is disposed above and compressively coupled to the pressure-transfer members (174). A force exerted by the second optical facility (130) is transferred via the pressure-transfer members so as to press the LED assembly toward the heat sink (120), thereby facilitating heat transfer. In one aspect, the LED assembly is secured in the housing without the need for adhesives. In another aspect, the secondary optical facility does not directly exert pressure onto any primary optical element, thereby reducing optical misalignment.