LED Pad Mount Heat Sink With Raised Alignment Surface
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Solution Overview
Problem
The increasing use of semiconductor-based LED lighting in vehicles poses challenges in alignment, thermal management, reliability, durability, manufacturing ease, and cost reduction, particularly due to the large size of heat sinks which complicate alignment with optical elements.
Innovation Solution
A heat sink with a raised, flat surface and a support structure featuring fixation spacers and touch down pegs, allowing precise alignment and thermal management, formed from materials like aluminum or thermally conductive alloys, and integrated with a PCB to maintain the LED and optical device on a common plane for improved optical coupling and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat sink is used to dissipate heat from high-power LEDs, then thermal management is improved, but alignment with optical elements becomes difficult due to the large size of the heat sink
Solution Approach 1:
The heat sink is segmented into a main body and a separate raised mounting pad. The mounting pad is a distinct feature that provides a localized precision alignment surface, while the main heat sink body maintains its thermal management function. This segmentation allows the alignment-critical portion to be geometrically precise while the thermal management portion can be larger in size.
Solution Approach 2:
The raised mounting pad acts as an intermediary element between the heat sink and the optical components. It serves as a mediator that provides a stable, precise alignment surface for mounting the optical elements and LED, while being thermally connected to the heat sink body for heat dissipation.
2Manufacturing precision
If a raised flat surface is added to the heat sink for precise LED and optical element alignment, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The mounting pad is merged with the heat sink body as an integrated structure. The pad is formed as part of the heat sink manufacturing process (stamping or extrusion), combining the thermal management function and the precision alignment function into a single component rather than separate parts.
Solution Approach 2:
The raised mounting pad serves multiple functions simultaneously: it provides a precision alignment surface for optical elements, acts as a mounting platform for the LED and support structure, and maintains thermal connection to the heat sink body. This multi-functionality reduces the need for additional components.
3Manufacturing precision
If fixation spacers and touch down pegs are used to connect the support structure to the heat sink, then alignment precision and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The touch down pegs are designed to self-align and self-center within corresponding recesses or holes in the heat sink. This self-service mechanism automatically establishes precise alignment during assembly without requiring complex external alignment tools or procedures, reducing assembly complexity while maintaining precision.
Solution Approach 2:
The fixation system uses localized features (raised mounting pad for spacers, recesses or holes for touch down pegs) at specific critical locations rather than requiring complex fixation mechanisms across the entire heat sink surface. This concentrates the precision requirements where needed while keeping the rest of the structure simple.
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 configuration enhances alignment precision, reduces manufacturing complexity, and improves thermal management, leading to increased reliability and durability of LED lighting assemblies while minimizing material costs and labor.
Implementation Method 1
heat sink having a raised, flat surface, an LED mounted on the raised, flat surface
Implementation Method 2
an LED mounted on the raised, flat surface
Data Source
AI summary
A lighting assembly includes a heat sink including a pad surface, and an LED mounted on the pad surface. An optical device is optically coupled to the LED, and a support structure is provided for connecting the optical device to the heat sink. The support structure includes fixation spacers to connect the supporting structure to the heat sink, and both the LED and the fixation spacers contact the pad surface on a common plane.