Shield Case Slit Design for Motherboard Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing shield cases fail to adequately follow complex distortions of a motherboard during a drop impact, leading to insufficient peeling strength and potential damage to electronic parts.
Innovation Solution
A shield case with a box-like shape and open end, featuring side plates with slits extending to the top plate and circular arc tip portions, which allows the shield case to easily follow substrate distortions, reducing stress concentration and enhancing peeling strength by optimizing the structure and placement of fixing and connecting portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shield case is made rigid to protect electronic parts, then protection strength is improved, but the shield case cannot follow the distortion of the motherboard during drop impact
Solution Approach 1:
The side plates are divided into multiple sections by forming slits that extend from the opened edge toward the top plate. This segmentation allows each section to move independently, enabling the shield case to follow the distortion of the motherboard while maintaining overall structural integrity and protection strength.
Solution Approach 2:
The shield case employs a flexible structure where the side plates can deform elastically during impact. The slits create flexibility in the side plates, allowing them to bend and follow the distortion of the motherboard without compromising the protective function of the shield case.
2Reliability
If the shield case structure is optimized to follow substrate distortion, then peeling strength is enhanced, but the structural complexity increases
Solution Approach 1:
The side plates are segmented into multiple sections using slits, which allows the structure to follow substrate distortion effectively. This segmentation approach achieves enhanced peeling strength through a relatively simple modification to the existing shield case design.
Solution Approach 2:
The rigidity of the side plates is adjusted by controlling the position, length, and pattern of the slits. By changing the structural parameters of the side plates (such as slit depth and spacing), the shield case achieves optimal followability to substrate distortion while maintaining manufacturing simplicity.
3Reliability
If slits are formed in the side plates to enhance followability, then peeling strength is improved, but stress concentration may occur at the slit tips
Solution Approach 1:
The tips of the slits are formed with a curved shape instead of sharp corners. This curvature reduces stress concentration at the slit tips by distributing the stress more evenly across the curved surface, preventing crack initiation while maintaining the flexibility benefits of the slits.
Solution Approach 2:
The geometry of the slit tips is modified by changing the curvature radius. By optimizing the curvature parameter, the design achieves a balance between maintaining slit functionality for followability and reducing stress concentration to prevent fatigue damage.
Data Source
AI summary
A shield case 10 has, disposed upon a lateral plate 12, a first anchor part 123 for anchoring to a substrate, and a slit 127 which extends from a release edge part to a top plate 11, whereupon a leading end portion 127a thereof is formed upon the top plate 11.