Releasable Board Level Shield Frame and Cover for Reworking
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Solution Overview
Problem
Conventional thermoformed metallized plastic board level shields are disposable and lack a reusable cover, making them unsuitable for reworking or component access after installation on a printed circuit board, which limits their functionality and efficiency in shielding against electromagnetic interference.
Innovation Solution
A board level shield with a frame and a releasably attachable cover that can be detached and reattached, allowing for reworking and component access while remaining soldered to the PCB, using inwardly extending tabs for alignment with solder ball pads and a secure attachment mechanism via dimples and holes for reusability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermoformed metallized plastic board level shields are used, then shielding against electromagnetic interference is provided, but the shield becomes disposable and cannot be reused for reworking or component access
Solution Approach 1:
The board level shield is divided into two separate components: a frame that remains soldered to the PCB and provides shielding, and a cover that can be detached and reattached. This segmentation allows the cover to be removed for component access and reworking while the frame maintains continuous shielding effectiveness, resolving the contradiction between shielding reliability and ease of repair.
2Ease of repair
If a removable cover is added to allow component access, then reworking capability is improved, but device complexity increases
Solution Approach 1:
By segmenting the shield into a simple frame and cover structure, the design adds minimal complexity while maximizing reworking capability. The frame maintains the essential shielding function with solder tabs, while the cover provides simple mechanical coverage that can be easily detached and reattached, achieving component access without significant structural complexity.
Solution Approach 2:
The cover is designed to nest over the frame structure, with the frame's sidewalls providing a mounting surface for the cover. This nested arrangement allows the cover to be securely attached when needed for shielding while enabling easy removal for component access, improving repair ease without adding complex attachment mechanisms.
Data Source
AI summary
According to various aspects, exemplary embodiments are disclosed of frames for shielding assemblies. Exemplary embodiments are also disclosed of shielding assemblies including such frames. In exemplary embodiments, a frame for a board level shield (BLS) may include portions alignable with and solderable to solder ball pads along a printed circuit board. A cover may be releasably attachable to, detachable from, and reattachable to the frame.