Coil Component Terminal Width Variation for Resistance Balance
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Solution Overview
Problem
The existing coil components with alternately stacked interlayer insulating films and conductor layers exhibit a higher connection resistance for one terminal electrode connected to the lowermost coil pattern compared to the other terminal electrode connected to the uppermost coil pattern.
Innovation Solution
The coil component design includes a configuration where the second and third conductor layers have larger terminal patterns overlapping the coil patterns in the first conductor layer, connected via conductors penetrating the interlayer insulating films, with the width of these terminal patterns in the radial direction being larger than those in the third conductor layer, reducing connection resistance and increasing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one terminal electrode is connected to the lowermost coil pattern and the other to the uppermost coil pattern, then the coil component structure is simplified, but the connection resistance difference between the two terminal electrodes becomes large
Solution Approach 1:
The patent applies local quality by making the terminal patterns in different conductor layers have different widths. Specifically, the terminal patterns in the first, second, and fourth conductor layers have different radial widths, allowing each to contribute differently to the connection resistance. This local variation in pattern dimensions balances the overall connection resistance between the two terminal electrodes while maintaining the simplified stacked structure.
2Ease of manufacture
If terminal patterns have uniform width across all conductor layers, then manufacturing is simplified, but connection resistance cannot be optimized
Solution Approach 1:
The patent applies parameter changes by varying the radial width of terminal patterns across different conductor layers. The terminal patterns in the first, second, and fourth conductor layers have progressively different widths, which changes the electrical resistance characteristics of each connection path. This parameter variation allows optimization of the overall connection resistance while remaining compatible with standard manufacturing processes.
Data Source
AI summary
Disclosed herein is a coil component that includes a first conductor layer, one or more third conductor layers, and a second conductor layer stacked one another in this order. One end of the coil pattern in the first conductor layer is connected to first terminal patterns in the second and third conductor layers. The first terminal pattern in the second conductor layer is connected to a first terminal electrode. One end of the coil pattern in the second conductor layer is connected to a second terminal electrode. The width in a radial direction of the first terminal pattern positioned in the third conductor layer is larger than the width in the radial direction of the second terminal pattern positioned in the third conductor layer.