Adjustable Board Level Shield Latching for Thermal Interface Compression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional board level shields face challenges in generating optimal holding forces for thermal interface materials due to suboptimal locking features like dimples and holes, leading to inefficient heat transfer and tolerance stack-up issues.
Innovation Solution
A board level shield design with a cover and fence that allows adjustable latching positions, utilizing flat latching mechanisms without protruding features, enabling higher holding forces and eliminating tolerance stack-up issues, while accommodating thermal interface materials for improved heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional locking features like dimples and holes are used, then the shield structure is simple to manufacture, but the holding force for thermal interface materials is insufficient
Solution Approach 1:
The locking mechanism is segmented into multiple discrete locking features distributed around the perimeter of the cover, each independently engaging with corresponding features on the fence. This segmentation allows each locking feature to be optimized for holding force while maintaining manufacturing simplicity through modular construction.
Solution Approach 2:
The locking features utilize curved or rounded geometries rather than sharp corners, which distributes stress more effectively and increases the contact area between the cover and fence. This curvature enhancement improves the holding force without significantly complicating the manufacturing process.
2Reliability
If conventional dimples and holes are used for locking, then the structure is simple, but tolerance stack-up issues occur
Solution Approach 1:
The locking features are pre-configured with built-in compliance elements that automatically compensate for tolerance variations during assembly. This preliminary design action eliminates the need for precise tolerance control while maintaining reliable locking across multiple positions.
Solution Approach 2:
The locking mechanism incorporates compliant elements with variable stiffness that adapt to different tolerance conditions. By changing the mechanical parameters of the locking features to include flexibility, the system achieves tolerance stability without increasing overall complexity.
3Strength
If the cover is fixed in position, then the shielding is simple, but thermal interface material compression is insufficient
Solution Approach 1:
The latching mechanism transitions from a static fixed-position design to a dynamic multi-position system where the cover can be selectively locked at different heights. This dynamic capability allows optimal compression of thermal interface materials while maintaining a relatively simple overall structure through the use of spring-loaded or cam-based locking features.
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 design provides enhanced EMI shielding and thermal management by ensuring effective compressive contact between thermal interface materials and components, improving heat transfer and reliability across multiple latched positions.
Implementation Method 1
A thermal interface material may be along an inner surface of the top portion of the cover
Implementation Method 2
A common solution to ameliorate the effects of EMI/RFI is through the use of shields capable of absorbing and/or reflecting and/or redirecting EMI energy
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
According to various aspects, exemplary embodiments are disclosed of board level shields. In an exemplary embodiment, a board level shield generally includes a cover (or lid) and a fence (or frame or base). The cover is attachable to the fence in a plurality of different latched positions.