Multilayer Coil Layout for Core Size and Low DC Resistance
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Solution Overview
Problem
The miniaturization and thinning of coil components in electronic devices pose challenges in maintaining magnetic properties and electrical characteristics due to limitations in increasing the magnetic material ratio in the core, and the use of wider via pads for alignment compromises core size.
Innovation Solution
A coil component design with narrower line widths in the innermost turns of the coils and a parallel connection structure using conductive vias to secure core size, improving magnetic properties and reducing electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil component is miniaturized and thinned, then the size of the electronic device is reduced, but the magnetic properties of the coil component deteriorate
Solution Approach 1:
The patent applies local quality by creating a via pad structure where the line width varies along the length of the pad. The first end portion has a narrower line width to preserve core size and magnetic properties, while the second end portion has a wider line width to ensure proper alignment and electrical connection. This localized variation in geometry allows the component to simultaneously achieve miniaturization and maintain magnetic performance.
2Reliability
If the ratio of magnetic material in the core is increased, then the magnetic properties are improved, but the strength of the inductor body and frequency characteristics are adversely affected
Solution Approach 1:
The patent addresses this contradiction by optimizing the local geometry of the via pad rather than increasing magnetic material ratio. The narrowed first end portion allows sufficient core size to be maintained, preserving magnetic properties without needing to increase magnetic material ratio, thereby avoiding adverse effects on inductor body strength and frequency characteristics.
3Manufacturing precision
If a via pad with wider line width is formed to secure alignment, then alignment between conductive via and coil is improved, but the core size becomes insufficient and magnetic properties deteriorate
Solution Approach 1:
The patent resolves this contradiction by implementing a via pad with non-uniform line width. The second end portion maintains a wider line width to ensure adequate alignment tolerance and manufacturing precision, while the first end portion has a narrower line width that preserves sufficient core size. This localized differentiation allows both alignment requirements and core size requirements to be satisfied simultaneously.
Data Source
AI summary
A coil component includes a body, a substrate, a first coil, a second coil, a plurality of conductive vias connecting an innermost turn of the first coil and an innermost turn of the second coil to each other, a first external electrode connected to one end of the first coil, and a second external electrode connected to one end of the second coil, wherein the innermost turn of the first coil includes a first region having a line width, narrower than a line width of an adjacent outer turn, and the innermost turn of the second coil includes a second region having a line width, narrower than a line width of an adjacent outer turn, and at least one of the plurality of conductive vias is connected to the first region, and at least one of the other conductive vias is connected to the second region.