Coil Component Electrode Layout for Adhesion and Short Isolation
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Solution Overview
Problem
The challenge is to enhance the adhesion strength of external electrodes in coil electronic components to prevent peeling and short circuits, while also ensuring the integrity of the insulating layer to prevent moisture penetration and cracking.
Innovation Solution
A coil electronic component design featuring external electrodes with a specific thickness difference and irregular surfaces, along with an insulating layer of controlled thickness, to optimize separation distance and bonding strength, and prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the area where the external electrode is formed on the surface of the main body is widened to increase adhesion strength, then the adhesion strength of the external electrode is improved, but the separation distance between external electrodes becomes too close and causes short circuit
Solution Approach 1:
The patent divides the surface into distinct functional zones: external electrode formation areas and insulating layer formation areas. The insulating layer is formed in regions between external electrodes to provide electrical isolation, while external electrodes are formed in specific areas with adequate separation distance. This spatial segmentation allows both wide electrode areas for adhesion and sufficient separation for preventing short circuits.
2Volume of moving object
If an insulating layer is formed thinly on the outer surface of the main body, then the component profile is reduced, but cracks occur in the insulating layer due to surface irregularities resulting in moisture penetration
Solution Approach 1:
The patent optimizes the insulating layer thickness to a specific range (1-10 μm) that balances profile reduction and crack prevention. Additionally, the surface irregularities of the main body are controlled within specific parameters (Ra 0.1-1.0 μm) to minimize stress concentration points that would cause cracking. These parameter optimizations allow thin insulating layers without compromising moisture protection.
3Volume of moving object
If the separation distance between external electrodes is reduced to decrease component size, then the component profile is minimized, but the adhesion strength of external electrodes is compromised
Solution Approach 1:
The patent extends external electrodes in multiple dimensions - they wrap around the main body surface and extend onto side surfaces, effectively increasing the adhesion area without increasing the planar separation distance. This multi-dimensional electrode configuration maintains strong adhesion while minimizing the component's overall footprint and separation distance between electrode terminals.
Data Source
AI summary
A disclosed coil electronic component includes: a main body that includes a first and a second surface opposing each other, a third surface and a fourth surface opposing each other, and a fifth surface and a sixth surface opposing each other, and includes a magnetic material; a coil disposed inside the main body; a first external electrode and a second external electrode that are disposed at a distance from each other on the fifth surface or the sixth surface of the main body and respectively connected to opposite ends of the coil; and an insulating layer that covers at least a portion of the fifth surface or sixth surface of the main body between the first external electrode and the second external electrode. A thickness of the insulating layer may be greater than 1 μm and smaller than 10 μm.