Plated Inductor Wiring Structure for Stronger Insulation Adhesion
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Solution Overview
Problem
The existing inductor components face issues with insufficient adhesion between the underlying insulation layer and the inductor wiring line, leading to potential separation and compromised high-frequency characteristics.
Innovation Solution
The inductor component design includes a seed layer and a plating layer with a crotch portion and projections, where the seed layer is in contact with the upper face of the projection, allowing for balanced plating growth and improved anchoring of the leg portions within the underlying insulation layer, enhancing adhesion and high-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inductor wiring line is directly disposed on the underlying insulation layer, then the structure is simple and easy to manufacture, but the adhesion between the underlying insulation layer and the inductor wiring line is insufficient
Solution Approach 1:
The patent introduces a seed layer as an intermediary between the underlying insulation layer and the inductor wiring line. This seed layer acts as a mediator that enhances adhesion by providing a transition interface with different surface properties, allowing the plating layer to bond more effectively to the insulation layer while maintaining ease of manufacture through a standardized layering process.
Solution Approach 2:
The patent creates a composite structure consisting of multiple layers (underlying insulation layer, seed layer, plating layer) with different material properties. This composite construction combines the insulating properties of the insulation layer with the conductive properties of the plating layer, while the intermediate seed layer ensures strong interfacial bonding between these dissimilar materials.
2Reliability
If the seed layer is disposed at the crotch portion in contact with the projection, then the adhesion and anchoring are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies local quality by concentrating the seed layer specifically at the crotch portion where it contacts the projection, rather than uniformly across the entire inductor wiring line. This localized application provides enhanced adhesion exactly where the geometric complexity creates stress concentration and separation risk, while minimizing the overall structural complexity and material usage.
Solution Approach 2:
The patent employs preliminary action by pre-forming the projection on the underlying insulation layer before depositing the seed layer and plating layer. This preliminary structural feature is prepared in advance to guide the subsequent deposition processes, ensuring that the seed layer automatically positions itself at the critical crotch portion for optimal adhesion without requiring additional complex manufacturing steps.
3Reliability
If the leg portions are embedded in the underlying insulation layer, then the anchoring effect is enhanced, but the risk of separation during plating increases
Solution Approach 1:
The seed layer serves as an intermediary that facilitates uniform plating deposition on the embedded leg portions. By providing a consistent intermediate surface between the plating solution and the insulation layer interface, it ensures uniform material deposition even in the complex geometry of embedded legs, preventing non-uniform plating while maintaining strong anchoring through the embedding structure.
Solution Approach 2:
The patent utilizes parameter changes by controlling the deposition conditions and material properties during the plating process to achieve uniform coating on the embedded leg portions. By adjusting plating parameters such as deposition rate, solution composition, and electrical parameters, uniform plating is achieved despite the complex embedded geometry, ensuring both anchoring strength and manufacturing precision.
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 improves the adhesion between the underlying insulation layer and the inductor wiring line, reducing the risk of separation and ensuring better high-frequency characteristics by forming leg portions in a controlled shape.
Implementation Method 1
The inductor wiring line includes a seed layer, and a plating layer disposed in contact with the seed layer
Data Source
AI summary
An inductor component includes a base body, an underlying insulation layer, an inductor wiring line, and a covering insulation layer. The underlying insulation layer is within the base body, and includes a first major face. The inductor wiring line is on the first major face within the base body, and extends along the first major face. The covering insulation layer is within the base body, and covers at least part of the inductor wiring line. The inductor wiring line includes a seed layer, and a plating layer in contact with the seed layer. As seen in a first cross-section orthogonal to a direction in which the inductor wiring line extends: the inductor wiring line includes first and second leg portions and a crotch portion. The first and second leg portions are in opposite end portions of a lower face of the inductor wiring line in a width direction.