Cylindrical Magnetic Body Shielding EMI on Layered Print Boards
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Solution Overview
Problem
Image processing apparatuses face challenges in reducing Electromagnetic Interference (EMI) caused by frequency signal lines on print boards, which affects the performance and efficiency of image forming and reading devices.
Innovation Solution
The integration of a cylindrical magnetic body within the print board's layered structure, electrically insulated from the frequency signal lines, acts as an electromagnetic shield to surround and reduce EMI, allowing for more compact circuit collection while maintaining signal transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If frequency signal lines are densely arranged on the print board to improve circuit collection compactness, then device complexity is reduced, but EMI increases
Solution Approach 1:
A cylindrical magnetic body is introduced as an intermediary element between the frequency signal lines and the surrounding environment. This magnetic body acts as an electromagnetic shield that mediates the interaction between signal lines and external fields, allowing compact circuit arrangement while suppressing EMI through its magnetic properties
Solution Approach 2:
The patent changes the electromagnetic parameters of the print board by introducing a magnetic body with specific magnetic permeability. This parameter change modifies the electromagnetic field distribution around the signal lines, enabling closer spacing while controlling EMI through the magnetic shielding effect
2Object-generated harmful factors
If electromagnetic shielding layers are added above and below frequency signal lines to reduce EMI, then EMI is reduced, but device complexity increases
Solution Approach 1:
The patent merges the shielding function with the existing print board structure by integrating the cylindrical magnetic body directly into the board layers. This combines the shielding function with the structural support function, reducing overall complexity compared to adding separate shielding layers
Solution Approach 2:
Instead of adding shielding layers in the planar dimensions (above and below the signal lines), the patent uses a cylindrical magnetic body that extends in the thickness dimension. This dimensional approach provides effective shielding while minimizing the footprint and 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
This solution effectively minimizes EMI, enabling the compact collection of circuits and enhancing the performance of image processing devices by reducing electromagnetic wave leakage and allowing for closer spacing of signal lines, thus improving operational efficiency.
Implementation Method 1
a cylindrical magnetic body... extend along the one or more frequency signal lines and surround a circumference of the one or more frequency signal lines
Data Source
AI summary
In an image processing apparatus, a print board includes a layered board, frequency signal lines, and a cylindrical magnetic body. The frequency signal lines are formed on an intermediate layer of the layered board. The cylindrical magnetic body includes a lower portion, an upper portion, and a pair of side portions, wherein the lower portion and the upper portion are respectively formed on layers of the layered board that are, in a thickness direction of the print board, located under and on the intermediate layer on which the frequency signal lines are formed, and the pair of side portions connect the lower portion and the upper portion at opposite sides of the frequency signal lines. The cylindrical magnetic body is formed in a shape of a cylinder in such a way as to extend along the frequency signal lines and surround a circumference of the frequency signal lines.