Elastic Member Shielding Structure for Reliable Noise Reduction
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Solution Overview
Problem
Existing electromagnetic shielding structures in mobile communications devices face disruptions in electrical contact due to variations in shape, aging, and oxidation of conductive rubber gaskets, leading to deterioration of noise shielding effectiveness.
Innovation Solution
An electronic device design incorporating an elastic member between the mainboard and a conductive bracket, with a conductive flexible gasket that does not overlap with the elastic member, ensuring consistent electrical contact and using a protrusion to prevent damage from the conductive bracket, thereby maintaining noise shielding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive rubber gasket is used to maintain electrical contact between the mainboard and conductive bracket, then noise shielding is provided, but the electrical contact deteriorates due to aging, oxidation, and shape variations
Solution Approach 1:
The shielding structure is divided into multiple independent contact points through protrusions on the mainboard that contact the conductive bracket at discrete locations. This segmentation ensures that if one contact point deteriorates, others maintain electrical continuity, resolving the reliability-duration contradiction by distributing the contact function across multiple independent paths.
Solution Approach 2:
The conductive bracket is pre-formed with contact protrusions and the mainboard is pre-formed with corresponding contact structures before assembly. This preliminary preparation ensures proper alignment and consistent electrical contact from the outset, preventing contact deterioration that would otherwise occur during assembly and use, thereby maintaining noise shielding effectiveness throughout the service life.
2Reliability
If the ground pad size is increased to improve electrical contact, then noise shielding is enhanced, but the space for part mounting is reduced
Solution Approach 1:
The ground pad area is segmented into multiple smaller contact points distributed across the mainboard surface. Each protrusion creates a localized electrical contact point, collectively providing sufficient electrical conductivity for noise shielding while distributing the required area across the available space, thus maintaining both contact quality and mounting space.
Solution Approach 2:
The electrical contact is transitioned from a two-dimensional ground pad surface contact to a three-dimensional protrusion-based point contact system. This dimensional change allows electrical contact to be achieved through vertical protrusions rather than horizontal ground pad expansion, preserving mounting space while maintaining contact quality.
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
The solution effectively prevents the deterioration of noise shielding due to weakened electrical contact or aging, ensuring reliable noise reduction and space efficiency by reducing the size of the ground pad.
Implementation Method 1
an elastic member coupled to the mainboard, and electrically connected with the ground of the mainboard; wherein the elastic member is in elastic contact with the conductive bracket
Data Source
AI summary
An electronic device is provided including a mainboard having a ground; a conductive bracket coupled to the mainboard; and an elastic member coupled to the mainboard, and electrically connected with the ground of the mainboard; wherein the elastic member is in elastic contact with the conductive bracket; and wherein the elastic member is electrically connected to the conductive bracket.