Coil Component Layered Ferrite Distribution for Crack Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing coil components face a trade-off between high frequency characteristics and strength, as reducing ferrite content in the magnetic portion improves high frequency performance but degrades the strength of the element assembly, leading to potential cracking during mounting.
Innovation Solution
A coil component design with a magnetic portion structured into three layers, where the first and third layers have ferrite contents of 40% or more by volume, and the second layer has a lower ferrite content, enhancing ferrite-to-ferrite coupling and strength, while maintaining good high frequency characteristics by optimizing the ferrite distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ferrite content in the magnetic portion is decreased, then the high frequency characteristics are improved, but the strength of the element assembly degrades
Solution Approach 1:
The magnetic portion is divided into three portions (first, second, and third portions) with different ferrite contents. The first and third portions have high ferrite content (40% or more by volume) to provide strength and prevent cracking, while the second portion has lower ferrite content to improve high frequency characteristics. This local differentiation of material properties resolves the contradiction between strength and high frequency performance.
Solution Approach 2:
The magnetic portion is segmented into three distinct portions with different ferrite content ratios. This segmentation allows each portion to fulfill different functional requirements: the outer portions (first and third) provide mechanical strength and crack prevention, while the inner portion (second) optimizes high frequency characteristics. The conductor portion is embedded primarily in the second portion to maximize the benefit of lower ferrite content for high frequency performance.
Data Source
AI summary
A coil component including an element assembly that includes a magnetic portion and a coil-like conductor portion embedded in the magnetic portion and outer electrodes disposed on an outer surface of the element assembly, wherein the outer surface has a mounting surface parallel to the central axis of a coil, the magnetic portion includes a first portion, a second portion, and a third portion, the first portion and the third portion contain glass and ferrite and have ferrite contents of 40 percent by volume or more, the second portion contains glass and ferrite and has a ferrite content smaller than the ferrite contents in the first portion and the third portion, and each of the first portion and the third portion has a covered region that is covered with the outer electrode and an exposed region that is not covered with the outer electrode on the mounting surface.