Coil Component Electrode Design for Mounting Strength and Withstand Voltage
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Solution Overview
Problem
Existing coil components face a challenge in maintaining withstand voltage while securing mounting strength, as increasing the size of terminal electrodes leads to a decrease in withstand voltage.
Innovation Solution
The coil component design includes a first electrode part with a larger exposed surface area for mounting strength and a smaller opposing surface area to reduce voltage decrease, with soft magnetic metal particles and a high resistance portion between the coil and electrode to enhance withstand voltage, and external electrodes for improved connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the size of the terminal electrode is increased to improve mounting strength, then the joined area between the terminal electrode and the wiring pattern increases, but the opposing area between the terminal electrode and the conductor pattern increases, causing the withstand voltage to decrease
Solution Approach 1:
The terminal electrode is designed with non-uniform cross-sectional area along its length: the first cross-sectional area (at the mounting surface) is larger than the second cross-sectional area (at the opposing surface). This local variation in geometry allows the electrode to provide both large joined area for mounting strength and small opposing area for high withstand voltage, resolving the technical contradiction between these two requirements
2Strength
If the size of the terminal electrode is increased to improve mounting strength, then the joined area increases, but the stray capacitance increases, causing electrical performance to deteriorate
Solution Approach 1:
By making the terminal electrode's cross-sectional area vary along its length (larger at the mounting end, smaller at the opposing end), the design achieves large joined area for mounting strength while minimizing the opposing area that generates stray capacitance, thus resolving the contradiction between mechanical strength and electrical performance
Data Source
AI summary
A coil component includes an element body, a coil and a first electrode part. The element body includes a main surface which is used as a mounting surface. The coil is disposed in the element body. The first electrode part is embedded in the element body and electrically connected to the coil. The first electrode part includes a first surface exposed from the main surface and a second surface opposing the first surface. An area of the first surface is larger than an area of the second surface when viewed from a direction orthogonal to the first surface.