Two-piece solderable shield for PCB heat dissipation
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Solution Overview
Problem
Existing shielding elements for circuitry on circuit boards are inefficient in reducing electromagnetic radiation and heat dissipation while maintaining structural integrity and weight reduction.
Innovation Solution
A two-piece solderable shield comprising a fence and a lid, both formed from materials like aluminum or aluminum-based alloys plated with solderable materials, where the lid can be thicker or made of different materials for enhanced shielding and heat absorption, and the fence is designed with a recess to reduce stacked height and facilitate assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a single-piece shield is used, then structural integrity is maintained, but weight is excessive and heat dissipation is insufficient
Solution Approach 1:
The shield is divided into two separate pieces: a fence portion and a lid portion. The fence is made of lighter aluminum material for weight reduction, while the lid can be made of thicker or different material for enhanced shielding and heat absorption. This segmentation allows optimization of each component's material properties independently, achieving both weight reduction and structural integrity.
2Object-affected harmful factors
If the lid is made thicker or of different material for enhanced shielding, then electromagnetic shielding and heat absorption improve, but manufacturing complexity increases
Solution Approach 1:
By separating the shield into fence and lid components, each can be manufactured independently using appropriate processes. The fence can be formed by stamping from aluminum, while the lid can be separately manufactured with different thickness or material properties. This independent manufacturing simplifies production despite material differences.
Solution Approach 2:
The shield system uses composite construction where the fence is made of aluminum (lightweight) and the lid can be made of different material or greater thickness (for enhanced shielding). This composite approach allows each component to use the most suitable material for its specific function, optimizing electromagnetic shielding while maintaining ease of manufacture through specialized production processes.
3Length of stationary object
If the fence and lid are assembled with stacking, then height increases, but assembly precision is reduced
Solution Approach 1:
The lid is designed to nest within the upper frame of the fence structure. The recess in the upper frame receives the lid therein, creating a nested configuration where the lid sits within the fence's upper frame rather than stacking on top. This nesting arrangement reduces the overall stacked height and improves assembly precision by eliminating gaps between components.
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 two-piece shield effectively reduces weight, increases structural rigidity, and improves electromagnetic shielding and heat dissipation, allowing for thinner fence materials and thicker lid options, while maintaining reduced height and improved assembly precision.
Implementation Method 1
The shield could be formed from aluminum or an aluminum-based alloy that is plated with a solderable material such as nickel or tin. The frame could be soldered to the circuit board, the electrical components can be checked, and the lid can be placed on and soldered to the fence.
Implementation Method 2
The lid could be made of a different material and/or be of a greater thickness than the fence to facilitate shielding and heat absorption. With such an assembly, the lid can be positioned over (and proximate to) the circuit to shield the circuit (e.g., from electromagnetic radiation) and dissipate heat from the circuit.
Implementation Method 3
Shielding elements are used in electrical circuits to protect specific components of the circuit from electromagnetic radiation (e.g., spurious emission or irradiation). The shield includes a fence and a lid... configured to surround the circuit when mounted to the circuit board.
Data Source
AI summary
This disclosure relates to a two-piece shield comprising a fence having integrally formed sidewalls and an upper frame, and a lid. The lid attaches to the fence, which is attached to the circuit board. The fence is a relatively thick, flexible material for supporting the lid. The fence has a recess so that the lid can be recessed into the fence to position the lid closer to the circuit for enhanced heat absorption. The lid could be made of a thicker heat absorbing material than the fence, again to facilitate heat absorption. The lid can be press-fit into the recess of the fence. The fence and lid can have a dovetail configuration to retain the lid in the fence.