Multilayer Coil External Electrode Structure Against Peeling
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Solution Overview
Problem
Multilayer coil components face issues with insufficient fixing strength of external electrodes to the element body, leading to potential peeling and loss of functionality under external forces.
Innovation Solution
The design of external electrodes with varying dimensions and shapes, including electrode conductors with different widths and lengths, increases the contact area with the element body, enhancing the fixing strength by creating a more complex and larger contact surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external electrodes are disposed on the element body with conventional simple shapes, then the device complexity is low and ease of manufacture is high, but the fixing strength of the external electrodes with respect to the element body is insufficient
Solution Approach 1:
The electrode conductors are designed with three-dimensional L-shaped structures comprising first parts extending in the second direction and second parts extending in the third direction, transforming a simple planar configuration into a multi-dimensional structure that increases contact area with the element body without significantly complicating the manufacturing process
Solution Approach 2:
Each external electrode is divided into multiple electrode conductors (first, second, third, and fourth electrode conductors) with varying dimensions, where each segment contributes to the overall fixing strength by creating multiple contact points and distributed stress areas on the element body
2Reliability
If external electrodes are disposed on the element body with simple shapes, then the ease of manufacture is high, but the external electrode may peel off from the element body under external forces
Solution Approach 1:
The L-shaped electrode conductors extend in multiple directions (second direction and third direction) creating a three-dimensional contact structure that anchors the external electrodes more securely to the element body, preventing peeling under external forces while maintaining compatibility with standard manufacturing processes
Solution Approach 2:
The electrode conductors are designed with specific dimensional variations in different regions (first parts with specific widths and lengths in the second direction, second parts with specific widths and lengths in the third direction) to optimize local adhesion characteristics and stress distribution across the electrode-element body interface
Data Source
AI summary
A plurality of electrode conductors included in a first external electrode and a second external electrode of a multilayer coil component includes a first part in a second direction and a second part in a third direction. A first electrode conductor and a third electrode conductor differ in at least any one dimension of four dimensions including a width of the first part, a length of the first part, a width of the second part, and a length of the second part. A second electrode conductor and a fourth electrode conductor differ in at least any one dimension of the four dimensions. The first electrode conductor and the second electrode conductor differ in at least any one dimension of the four dimensions. The third electrode conductor and the fourth electrode conductor differ in at least any one dimension of the four dimensions.