Light Emitting Device Thermal Management via Interlocking Projections
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting apparatuses face limitations in connection strength and thermal stability, leading to potential bending of support members due to thermal expansion, which affects light directivity and illumination quality.
Innovation Solution
A light emitting apparatus design featuring a heat dissipation member with projections and recesses that reinforce the cover's side walls, allowing for enhanced strength and thermal guidance, eliminating the need for fragile connections and preventing orientation changes of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If claw-shaped portions are formed by folding tube edge portions, then the tube can be connected to the support plate, but the connection strength is limited due to the thin thickness of the claw-shaped portions
Solution Approach 1:
The connection structure is divided into separate components: the heat dissipation member has recesses and the cover has protrusions that engage with each other. This segmentation allows each part to be optimized independently - the heat dissipation member can have thick, strong connection features without compromising the overall device complexity.
Solution Approach 2:
The protrusions of the cover are inserted into the recesses of the heat dissipation member, creating a nested connection structure. This nesting provides strong mechanical interlocking while maintaining a compact overall design, resolving the contradiction between connection strength and structural complexity.
2Stability of the object's composition
If the support plate is made rigid to prevent bending, then thermal expansion may cause the support plate to warp, but if it is made flexible, the light directivity changes and illumination quality deteriorates
Solution Approach 1:
The support function is extracted from the cover and transferred to the heat dissipation member through the engagement structure. The heat dissipation member's recesses provide stable support and positioning, preventing warping while maintaining light directivity, as the rigid support is now provided by the heat dissipation member rather than the cover.
Solution Approach 2:
The engagement structure consisting of protrusions and recesses acts as an intermediary between the cover and heat dissipation member. This intermediary mechanism provides stable support and prevents warping while allowing the cover to maintain its optical properties and light directivity.
3Strength
If the cover side walls are made thicker to increase strength, then the connection to the heat dissipation member becomes more robust, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The connection features are segmented into separate protrusions and recesses that can be formed using standard molding techniques. This segmentation allows the cover to have adequate wall thickness for strength while maintaining ease of manufacture, as the connection features are integrated into the molding process rather than requiring additional thickening of the side walls.
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 robust and thermally stable light emitting apparatus with improved connection strength, maintaining consistent illumination and preventing discomfort-causing changes in light orientation, while also keeping the apparatus clean and ensuring effective heat dissipation.
Implementation Method 1
a heat dissipation member (6) including a pair of outer surfaces (6a, 6b) disposed between inner surfaces (71a, 71b) of the pair of side walls (25a, 25b) of the cover (7)
Implementation Method 2
including a fin (15a, 15b; 16a, 16b; 17a, 17b; 18a, 18b) disposed between the outer surfaces (6a, 6b)
Implementation Method 3
the recesses (21a, 21b) extending longitudinally of the cover (7) in engagement with the projections (22a, 22b)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A light emitting apparatus includes a light-transmissive cover including a pair of side walls, a heat dissipation member including a pair of outer surfaces disposed between inner surfaces of the pair of side walls of the cover and including a fin disposed between the outer surfaces, a light emitting element supported by the heat dissipation member and accommodated in the cover, projections, and recesses. One of the cover and the heat dissipation member has the projections, which are respectively provided on the inner surfaces of the cover or the outer surfaces of the heat dissipation member. The other of the cover and the heat dissipation member has the recesses, which are respectively provided on the inner surfaces of the cover or the outer surfaces of the heat dissipation member. The recesses extend longitudinally of the cover in engagement with the respective projections.