Shield Assembly With Spring Contact For EMI Mitigation
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Solution Overview
Problem
The integration of multiple electronic components in portable devices poses challenges in maintaining optimum performance due to electromagnetic interference, especially as devices become thinner and smaller, making it difficult to effectively shield components like cameras from electric fields that can interfere with other components.
Innovation Solution
A shield assembly is implemented, comprising a conductive chassis and a covering with retention features that provide mechanical and electrical coupling, using a spring contact between tabs and a conductive rail to maintain grounding and reduce electromagnetic interference while maintaining a thin device structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional electronic components are integrated into portable devices, then functionality is improved, but electromagnetic interference increases
Solution Approach 1:
The shield assembly segments the device into shielded and unshielded zones by introducing a conductive partition structure. This conductive shield divides the internal space, creating separate electromagnetic environments that prevent interference between adjacent electronic components while allowing each component to function independently.
Solution Approach 2:
The conductive shield acts as an intermediary element between electronic components. It provides a controlled electromagnetic interface that blocks harmful fields from propagating to sensitive components while maintaining proper grounding through the conductive rail system, thus mediating the electromagnetic interaction between components.
2Length of moving object
If device thickness is reduced, then portability is improved, but shielding effectiveness deteriorates
Solution Approach 1:
The shield assembly employs thin conductive shield elements and flexible conductive rails that can be effectively integrated within the reduced thickness of modern portable devices. These thin film-like conductive structures provide adequate electromagnetic shielding performance while maintaining a compact profile that fits within thin device constraints.
Solution Approach 2:
The shield assembly utilizes a three-dimensional configuration with conductive rails extending in multiple directions and shield elements positioned at strategic locations. This spatial arrangement creates effective electromagnetic barriers without requiring increased thickness, as the shielding effect is achieved through strategic positioning rather than sheer mass or thickness.
3Object-affected harmful factors
If conductive shielding is added, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The conductive rail serves multiple functions simultaneously: it provides electromagnetic shielding, establishes electrical grounding connections, and offers mechanical support for the shield elements. This multi-functionality reduces the need for separate components, thereby simplifying the overall structure despite the added shielding capability.
Solution Approach 2:
The shield assembly merges the shielding function with the grounding system by integrating conductive shield elements directly with conductive rails that are already part of the device's grounding infrastructure. This combination eliminates the need for separate grounding wires and simplifies the assembly process, reducing overall structural complexity.
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 shield assembly effectively mitigates electromagnetic field interference, ensuring the performance of electronic components like cameras and other nearby components by providing a grounded shielding solution within the constrained thickness of portable electronic devices.
Implementation Method 1
The spring contact can be disposed between a pair of tabs and can be configured to contact a conductive rail when the tabs are inserted into a mounting fixture... the spring contact can provide for a mechanically robust way to maintain electrical coupling contact
Implementation Method 2
The shield assembly can include a covering mounted to a conductive chassis and mounted over the electronic component... to shield an electronic component, such as a camera, to block or reduce electric fields
Data Source
AI summary
A shield assembly can enclose an electronic component in a chamber of a mobile communication device. The shield assembly can include a chassis having a slot and a conductive rail adjacent to the slot. A covering can be mounted over the electronic component and coupled to the chassis via a spring contact disposed in the slot. The covering can include a shield element configured to cover a chamber enclosing the electronic component. The covering can further include a first tab connected to the shield element, and a second tab connected to the shield element and spaced apart from the first tab by a gap. A spring contact can be disposed in the gap and electrically connected to the shield element via at least one of the first tab and the second tab.