Near Zero Force Grounding Feature for Electronic Devices
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Solution Overview
Problem
Existing grounding solutions for computing devices face issues with constant compressive force degradation, leading to bond performance problems and moisture ingress, which compromise the effectiveness of the electrical coupling and Faraday cage.
Innovation Solution
A grounding feature with a conductive outer portion and a removable expansion element that exerts a significant expansion force during assembly, then relaxes to near zero force after the expansion element is removed, maintaining adhesion and forming a stable ground path between housing components without constant compressive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grounding feature exerts constant compressive force to maintain electrical coupling, then the ground path remains stable, but the adhesive bond degrades over time and moisture can ingress
Solution Approach 1:
The grounding feature transitions from a static constant-force design to a dynamic system that provides high expansion force during assembly, then relaxes to near-zero force during operation. This dynamic behavior allows the adhesive bond to cure under initial compression and then maintain the ground path without continuous compressive stress that would cause degradation over time.
Solution Approach 2:
The expansion element is pre-loaded during assembly to create the necessary compressive force for adhesive bonding. Once the grounding feature is installed and the expansion element is removed or deflated, the preliminary compression action has already secured the adhesive bond, eliminating the need for continuous compression that would cause long-term degradation.
2Reliability
If a grounding feature uses constant compressive force to maintain adhesion, then electrical coupling is stable, but moisture ingress increases and bond performance degrades
Solution Approach 1:
The system dynamically adjusts the compressive force from high during assembly to near-zero during operation. This eliminates continuous compression that would create pathways for moisture ingress and cause adhesive bond degradation, while still maintaining sufficient contact for stable electrical coupling through the relaxed state of the grounding feature.
3Ease of manufacture
If a grounding feature exerts significant expansion force during assembly, then coupling is achieved, but the force must be removed to prevent damage
Solution Approach 1:
The expansion element provides the necessary assembly force as a preliminary action during installation, enabling the grounding feature to couple with housing components. After assembly, the expansion element is removed or deflated, and the grounding feature relaxes to near-zero force, preventing damage from continuous compression while maintaining the achieved coupling.
Solution Approach 2:
The expansion element is extracted or deflated after serving its assembly function. This removal of the expansion element allows the grounding feature to relax from high expansion force to near-zero force, eliminating the risk of damage from continuous compression while preserving the coupling achieved during assembly.
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 solution provides a stable and efficient electrical ground path and Faraday cage, reducing unwanted electromagnetic interference and emission, while minimizing moisture ingress and maintaining adhesion over time.
Implementation Method 1
an adhesive coupling the electrical grounding feature to the housing components, which adhesive can be electrically conductive
Implementation Method 2
exerting a significant expansion force against the housing components when the device is assembled
Data Source
AI summary
An electronic device can include first and second housing components and an electrical grounding feature located therebetween to provide a grounding path. The grounding feature can include an outer portion formed from an electrically conductive material and an internal region containing a removable expansion element. The grounding feature can exert an expansion force against the housing components when the device is assembled and the expansion element remains, and exert no expansion force against the housing components when the expansion element is removed. The device can also include an adhesive coupling the electrical grounding feature to the housing components, which adhesive can be electrically conductive. The expansion element can be deformable and removable from an open end of the grounding feature outer portion, which outer portion can be elastic and can deform to contact more of the housing components when the grounding feature is compressed therebetween.