Coil Component with Shielded Magnetic Paths
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Solution Overview
Problem
The existing coil components with a middle core for coupling two coil parts suffer from crosstalk issues when signals flow through both parts simultaneously, which affects their magnetic path and inductance characteristics.
Innovation Solution
A coil component configuration featuring a first and second coil part with a core and flange, a middle member with lower magnetic permeability than the core and shield member, and resinous shield members on the peripheral surfaces, which creates separate magnetic paths and enhances the shield effect, reducing crosstalk and improving inductance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a middle core is used to couple two coil parts together, then the coil parts are mechanically connected and form closed magnetic paths, but crosstalk occurs when signals flow through both coil parts simultaneously
Solution Approach 1:
The patent divides the magnetic path into separate segments for each coil part by introducing shield members. The first magnetic path is formed through the first core and first shield member, while the second magnetic path is formed through the second core and second shield member. This segmentation prevents magnetic flux from one coil part from interfering with the other, thereby reducing crosstalk while maintaining mechanical connection through the middle member.
Solution Approach 2:
The shield members act as intermediary elements that guide and isolate magnetic flux. The first shield member is positioned between the first and second coil parts to prevent magnetic flux from the first coil part from reaching the second coil part. Similarly, the second shield member prevents reverse interference. These intermediary shield members effectively block the harmful magnetic coupling between coil parts.
2Object-generated harmful factors
If shield members are added to create separate magnetic paths, then crosstalk is reduced and inductance characteristics are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the shield members. Each shield member simultaneously serves as a magnetic flux guide, a physical barrier between coil parts, and a structural support element. The middle member also performs multiple functions: mechanical coupling, positioning, and supporting the shield members. This merging of functions reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The middle member is designed with universal functionality, serving as both a mechanical coupling element and a support structure for the shield members. The shield members themselves are multi-functional, providing magnetic flux guidance, electrical isolation, and structural stability. This multi-functionality reduces the overall component count and simplifies the assembly process.
3Volume of moving object
If the coil component is made compact, then space is saved, but the distance between coil parts decreases leading to increased crosstalk
Solution Approach 1:
The shield members are positioned in the gaps between the coil parts and act as intermediary barriers that block magnetic flux. Even when the overall component size is reduced and the coil parts are placed closer together, the shield members maintain effective magnetic isolation. This allows the component to achieve compact dimensions without sacrificing crosstalk performance.
Solution Approach 2:
The patent applies magnetic shielding selectively at critical locations where magnetic flux leakage would cause crosstalk. The shield members are positioned specifically in the gaps between coil parts and around sensitive areas, providing localized magnetic flux guidance. This targeted approach to shielding achieves effective crosstalk reduction without requiring uniform thick shielding throughout the entire component, thus enabling compact design.
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 configuration effectively reduces crosstalk between the coil parts, enhances the shield effect, and allows for a more compact design with improved inductance characteristics and DC bias performance.
Implementation Method 1
a magnetic permeability of the middle member is lower than that of the core and the shield member
Implementation Method 2
a resinous shield member formed at least in part of peripheral surfaces of the respective first and second coil parts and containing a magnetic material powder
Implementation Method 3
a magnetic permeability of the middle member is lower than that of the core and the shield member
Data Source
AI summary
A coil component has a first coil part and a second coil part, a middle member, and a shield member. Each of the first and second coil parts includes a drum core and a winding. The middle member is located between the first and second coil parts arranged in a state in which axes of winding drums in the respective first and second coil parts are parallel to each other. The shield member is formed at least in part of an outside surface of the winding in each of the first and second coil parts and is a resin containing a magnetic material powder. The magnetic permeability of the middle member is lower than that of the core and the shield member.