Multilayer Coil Terminal Electrode Overlap Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multilayer coil components, increasing the coil diameter to improve characteristics leads to increased stray capacitance and a risk of terminal electrode defects due to reduced distance between the terminal electrode and the coil, and difficulties in ensuring a stable contact area during manufacturing.
Innovation Solution
The multilayer coil component design features terminal electrodes with overlapping and non-overlapping parts, ensuring a secure contact area with the element body, reducing stray capacitance, and preventing peeling by optimizing the shape and arrangement of electrode layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diameter of the coil is increased to improve characteristics, then the performance of the coil component is improved, but the distance between the terminal electrode and the coil decreases, resulting in increased stray capacitance and deterioration of characteristics
Solution Approach 1:
The terminal electrode is designed with an L-shape configuration, extending in both the vertical direction (along the stacking direction of dielectric layers) and the horizontal direction (perpendicular to the stacking direction). This multi-dimensional arrangement allows the electrode to maintain optimal distance from the coil while ensuring adequate contact area with the element body, thereby reducing stray capacitance without compromising electrical connection.
Solution Approach 2:
Different portions of the terminal electrode have different functional characteristics: the vertical portion ensures adequate distance from the coil to minimize stray capacitance, while the horizontal portion ensures adequate contact area with the element body for reliable electrical connection. This local differentiation of electrode geometry optimizes both competing requirements.
2Strength
If the terminal electrode is exposed on the side surface of the element body to enable solder-based firm fixing, then the bonding strength with the circuit board is improved, but the outermost electrode layer may peel off during manufacturing due to difficulty in ensuring contact area
Solution Approach 1:
The terminal electrode extends in multiple directions (vertical and horizontal dimensions) rather than solely in the vertical direction. This multi-dimensional configuration increases the contact area between the electrode and the element body's external electrode, providing adequate bonding strength for solder fixation while maintaining structural integrity during manufacturing processes.
Solution Approach 2:
The terminal electrode is conceptually divided into multiple electrode layers with different orientations and functions. The vertical electrode layers provide distance from the coil, while the horizontal electrode layers provide contact area with the element body. This segmentation of functional zones within the electrode structure prevents peeling during manufacturing.
Data Source
AI summary
A multilayer coil component includes an element body, a coil, and a pair of terminal electrodes. Each of the pair of terminal electrodes is formed by a plurality of electrode layers having different shapes being stacked in a stacking direction and is exposed on end surfaces, a main surface, and a pair of side surfaces. One electrode part of the terminal electrodes exposed on the side surfaces of the element body and formed by one of the electrode layers has an overlapping part overlapping at least a part of the other electrode part formed by another of the electrode layers adjacent to the one electrode layer in the stacking direction and a non-overlapping part not overlapping the other electrode part when viewed from the stacking direction.