Resin-Encapsulated Coil Component for Ferrite Particle Containment
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Solution Overview
Problem
Ferrite particles in a coil component are prone to diffusion, which compromises the reliability of electronic devices due to the fragility of the sintered ferrite material.
Innovation Solution
A coil component design that includes a ferrite sintered body covered by a resin layer on all main and side surfaces, with a coil conductor embedded in the resin layer, effectively suppressing particle diffusion and enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferrite sintered body is used as magnetic material, then high inductance is achieved, but ferrite particles diffuse and reliability deteriorates
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the ferrite sintered body and the external environment. This resin layer acts as a barrier that prevents ferrite particles from detaching and diffusing into surrounding spaces, while allowing the ferrite sintered body to maintain its magnetic functionality. The resin layer thus mediates between the need for high inductance (using ferrite) and the need to prevent particle diffusion (improving reliability).
Solution Approach 2:
The resin layer functions as a flexible protective shell that encapsulates the ferrite sintered body. This thin film structure provides mechanical protection against particle detachment while maintaining the overall compactness of the coil component. The flexible nature of the resin allows it to conform to the ferrite geometry and provide comprehensive coverage without adding excessive rigidity or volume.
2Object-generated harmful factors
If resin layer covers all surfaces of ferrite sintered body, then particle diffusion is suppressed, but manufacturing complexity increases
Solution Approach 1:
The resin layer is applied to cover at least the outer peripheral surface of the ferrite sintered body, which is the critical area where particle diffusion occurs during vibration or handling. While complete coverage of all surfaces would provide maximum protection, the patent implements partial coverage focused on the most vulnerable regions, thereby achieving effective particle suppression without the full manufacturing complexity of complete encapsulation.
3Device complexity
If conventional coil structure is used, then simple design is maintained, but ferrite particles diffuse in electronic device
Solution Approach 1:
The resin layer serves as a simple intermediary addition that integrates into the existing coil structure without fundamentally redesigning the conventional coil architecture. It provides particle diffusion protection as a supplementary protective layer, maintaining the original simple coil design while addressing the harmful particle diffusion issue through minimal structural modification.
Data Source
AI summary
Disclosed herein is a coil component that includes: a ferrite sintered body having a first main surface, a second main surface positioned on an opposite side of the first main surface, and a side surface connecting an outer peripheral edges of the first and second main surfaces; a coil conductor disposed so as to overlap the first main surface of the ferrite sintered body; and a resin layer covering the first and second main surfaces and at least a part of the side surface.