PCB Shield Contact Structure for Noise Shielding and Mounting Space
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Solution Overview
Problem
Existing electronic devices require a ground pattern to be provided over the entire periphery of the circuit board, narrowing the mounting region for electronic components.
Innovation Solution
An electronic device with a circuit board shielded by a first and second member, where the first member has an encompassing region with inner and outer contact regions that overlap the circuit board edges, and the second member has similar regions, allowing for reduced ground pattern size while maintaining effective noise shielding through projections and fixed portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ground pattern is provided over the entire periphery of the circuit board to ensure noise shielding, then noise shielding performance is improved, but the mounting region for electronic components is reduced
Solution Approach 1:
The ground pattern is segmented into two functional regions: an inner ground pattern region that provides noise shielding, and an outer ground pattern region that ensures proper grounding. This segmentation allows the inner region to be minimized for mounting purposes while the outer region maintains shielding effectiveness.
Solution Approach 2:
Different regions of the ground pattern are assigned different functions and densities. The inner region near electronic components has optimized ground pattern density for mounting flexibility, while the outer peripheral region has enhanced ground pattern coverage for noise shielding, creating local quality variations that resolve the contradiction.
2Area of stationary object
If the ground pattern region is reduced to expand mounting area, then mounting region is expanded, but noise shielding effectiveness may be compromised
Solution Approach 1:
The ground pattern design extends into the third dimension by incorporating vertical grounding structures and multi-layer PCB configurations. This allows the ground pattern footprint on the board surface to be reduced while maintaining shielding effectiveness through vertical grounding paths and stacked ground layers.
Solution Approach 2:
Ground vias and through-holes serve as intermediary elements that connect the inner and outer ground patterns, as well as connect different PCB layers. These intermediaries ensure continuous ground potential and effective noise shielding even when the surface ground pattern area is reduced.
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 provides enhanced noise shielding performance while allowing for expanded mounting regions for electronic components by minimizing the ground pattern's footprint on the circuit board.
Implementation Method 1
a first member that covers the first surface to function as a shield of the circuit board... the first member and the second member are in contact with each other... to function as a shield of the circuit board
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
Provided is an electronic device including a circuit board having a first surface and a second surface, a first member covering the first surface to function as a shield of the circuit board and having a first encompassing region having, in at least a portion thereof, a first outer region, and a second member that is placed on a side of the second surface that has a second outer region. One of the first and the second outer regions has at least one outer fixed portion fixed to another of the first and the second outer regions and at least one projection located away from the at least one outer fixed portion in a direction along an outer edge of the circuit board. The first and the second members are in contact with each other with the at least one outer fixed portion and the at least one projection.