Single Metal Shield for PCB Noise Segmentation
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Solution Overview
Problem
Existing electronic apparatuses face increased costs and size issues due to the need for separate shields for circuit elements generating intense and weak noises, which complicates noise propagation prevention.
Innovation Solution
A single metal sheet is used to form shield members that cover specific regions of a printed board, with sections electrically connected to the board's ground pattern to individually manage noise reduction, allowing for varying levels of noise shielding based on the intensity of noise sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate shields are disposed for circuit elements generating intense noises and weak noises, then noise propagation prevention is improved, but the number of shield members increases causing cost increase and size enlargement
Solution Approach 1:
The single shield member is segmented into multiple sections (first section, second section, boundary section) that face different regions of the printed board. Each section can be independently grounded through the boundary section to the ground pattern, allowing differential noise shielding strategies for different circuit regions without requiring separate physical shields.
Solution Approach 2:
Multiple shielding functions are merged into a single shield member structure. Instead of using separate shields for intense noise sources and weak noise sources, one integrated shield member provides shielding for both regions, reducing the total number of components while maintaining effective noise propagation prevention.
2Object-affected harmful factors
If a double structure shield is formed by disposing an additional shield for intense noise circuit elements, then noise shielding effectiveness is improved, but cost and apparatus size increase
Solution Approach 1:
The shield member exhibits local quality through its different sections. The first section facing the intense noise region can provide stronger shielding (e.g., better grounding connection) while the second section facing the weak noise region provides appropriate shielding without excess material. The boundary section electrically connects these regions to the ground pattern, enabling localized shielding optimization.
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 approach reduces costs and size by allowing for targeted noise reduction without the need for multiple shields, enhancing the effectiveness of noise shielding while simplifying assembly and manufacturing.
Implementation Method 1
covering the circuit element serving as a noise-generating source with a shield member formed by a metal sheet or the like has been practiced
Implementation Method 2
at least a boundary section of the first section and the second section is electrically connected to a ground pattern of the printed board
Data Source
AI summary
Provided is an electronic apparatus including a printed board having on a front surface thereof a first region and a second region in each of which a circuit element is disposed, and a shield member formed by a single metal sheet and disposed such as to face the front surface of the printed board. The shield member has a first section that faces the first region and a second section that faces the second region, and at least a boundary section of the first section and the second section is electrically connected to a ground pattern of the printed board, the ground pattern being formed between the first region and the second region.