Electronic Shield Wedge Design for Reflow Deformation Control
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Solution Overview
Problem
Conventional shields deform and tilt up during secondary reflow due to inward stress in the X and Y directions, causing a gap between the frame and the circuit board.
Innovation Solution
The shield design incorporates frame side wall wedges and cantilever beams that restrict movement in specific directions, allowing only stress in the first direction between the frame and cover, thereby preventing deformation of the frame and maintaining contact with the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover applies inward stress to the frame to prevent separation, then the cover remains attached to the frame, but the shield deforms and tilts up during secondary reflow causing a gap between the frame and circuit board
Solution Approach 1:
The frame is divided into multiple side walls, each with independent wedge structures. The cover is divided into corresponding side walls with opening structures. This segmentation allows stress to be distributed and controlled in specific directions at each segment, preventing cumulative deformation while maintaining attachment reliability.
Solution Approach 2:
The wedge structures and opening structures are designed with specific local geometries that create controlled stress distribution. The wedges have optimized shapes and positions that locally manage the stress between cover and frame, ensuring that stress is applied only in the Z-direction (perpendicular to circuit board) while preventing stress in X and Y directions that would cause tilting.
2Stability of the object's composition
If the frame and cover are rigidly connected to prevent movement, then attachment stability is improved, but the structure becomes complex and difficult to manufacture
Solution Approach 1:
The wedge and opening structures create a dynamic stress management system that adapts to thermal expansion and contraction during reflow. The structures allow controlled movement and stress redistribution rather than rigid constraint, maintaining stability while simplifying the overall design by using simple geometric forms that self-adjust during manufacturing processes.
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 design prevents the shield from tilting up by isolating stress in the second and third directions to the cantilever beam, ensuring reliable attachment to the circuit board without deforming other frame components.
Implementation Method 1
The frame side wall wedge is adapted to be wedged into the cover side wall opening to restrict the movement of the cover in a first direction
Implementation Method 2
The cantilever beam applies a force to the cover in the first direction
Data Source
AI summary
A shield is provided, including a frame and a cover. The frame includes a plurality of frame side walls and a frame top structure. Each frame side wall includes at least one frame side wall wedge. The frame side walls are connected to the frame top structure, and the frame top structure includes at least one cantilever beam. The cover includes a plurality of cover side walls and a cover top structure. Each cover side wall includes at least one cover side wall opening. The frame side wall wedge is adapted to be wedged into the cover side wall opening to restrict the movement of the cover in a first direction. The cover side walls are connected to the cover top structure. The cover top structure includes at least one cover top opening. The cantilever beam is wedged into and abuts the cover top opening.