Shield Case Terminal Leg Expansion for Circuit Board Joining Strength
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Solution Overview
Problem
Conventional shield cases for electronic circuit modules face issues such as peeling defects due to stress from environmental changes and increased solder joint complexity, which can lead to increased material usage and longer soldering times, as well as reduced design flexibility.
Innovation Solution
A shield case design featuring terminal leg portions with expansion terminal portions that extend beyond the circuit board's thickness, providing increased solder joining area and strength, and optional recessed or penetration features to enhance durability and joining strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of soldering parts is increased to enhance connection strength, then the reliability of the shield case attachment is improved, but the device complexity and manufacturing time are increased
Solution Approach 1:
The terminal leg portions are bent along the end surface of the circuit board to create expansion terminal portions that extend in a direction perpendicular to the board surface. This three-dimensional configuration increases the effective soldering area and connection strength without requiring additional soldering parts, thereby resolving the contradiction between reliability and device complexity
Solution Approach 2:
The terminal leg portions are pre-formed with bent shapes during shield case manufacturing, creating expansion terminal portions that are ready for soldering. This preliminary formation of the terminal structure eliminates the need for additional soldering operations and reduces manufacturing complexity while ensuring reliable connections
2Reliability
If the number of soldering parts is increased to enhance connection strength, then the reliability of the shield case attachment is improved, but the manufacturing time is increased
Solution Approach 1:
The terminal leg portions extend in a direction intersecting with the top plate portion, creating expansion terminal portions that protrude from the end surface of the circuit board. This spatial configuration provides adequate soldering area with fewer parts, reducing the overall soldering time while maintaining connection strength
Solution Approach 2:
The terminal leg portions are pre-bent into their final configuration during shield case fabrication, so that during assembly, the expansion terminal portions are already positioned correctly for soldering. This eliminates the need for additional positioning and soldering operations, reducing manufacturing time
3Reliability
If the number of solder joint parts is increased to enhance connection strength, then the reliability is improved, but the stress release capability is reduced
Solution Approach 1:
The terminal leg portions are bent along the end surface of the circuit board to create expansion terminal portions that extend perpendicular to the board surface. This three-dimensional configuration provides stress release capability through the bent structure while maintaining adequate connection strength, eliminating the need for multiple flat soldering parts
Solution Approach 2:
The terminal leg portions function as flexible connection elements that can deform to accommodate board warpage and stress. The bent configuration of the expansion terminal portions allows them to absorb mechanical stress while maintaining electrical and mechanical connections, providing both strength and stress release capability
Data Source
AI summary
A shield case, joined to a circuit board on which electronic components are mounted and covering the electronic components, has a top plate portion covering the electronic components, and a plurality of terminal leg portions formed in a way of projecting in a direction intersecting with the top plate portion from a peripheral edge portion of the top plate portion. Each of the plurality of terminal leg portions has: a leg portion stretching from the top plate portion; a terminal portion which extends in a direction intersecting with the leg portion from a front-end of the leg portion and is joined to the circuit board; and an expansion terminal portion which is formed by bending a front-end portion of each of the terminal portions along an end surface of the circuit board and has a length exceeding a thickness of the circuit board.