Coil Component Recess Design for Electrode Coupling
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Solution Overview
Problem
As electronic devices are miniaturized, the coupling force between thin-film coil components and external electrodes weakens, leading to reliability issues and compromised inductance characteristics.
Innovation Solution
The design enhances coupling force by distributing stress through specific configurations of lead-out portions, dummy lead-out portions, and connection patterns, increasing the number of coil turns and improving inductance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil component is miniaturized and thinned, then the size is reduced, but the coupling force between the coil and external electrode is weakened
Solution Approach 1:
The patent introduces a third dimension by forming the coil pattern in a recess of the body rather than on the surface. This allows the coil to be positioned deeper within the component structure, enabling better mechanical interlocking with the external electrode while maintaining a compact external footprint. The recess structure provides vertical engagement space that enhances coupling force without increasing the component's external dimensions.
Solution Approach 2:
The body is formed as a composite structure comprising a magnetic composite sheet with embedded conductive particles. This composite material provides both structural support and enhanced electrical conductivity pathways, strengthening the coupling between the coil pattern and external electrode. The magnetic composite sheet also provides mechanical reinforcement that maintains coupling force in miniaturized configurations.
2Reliability
If the number of turns of the coil is increased, then the inductance characteristics are improved, but the area occupied by the coil is increased
Solution Approach 1:
The coil pattern is formed in a recess that extends in the thickness direction of the body, allowing the coil turns to be arranged vertically as well as horizontally. This three-dimensional coil configuration enables a higher number of turns within the same planar footprint, improving inductance characteristics without increasing the component's surface area.
Solution Approach 2:
The coil pattern is nested within the recess of the body structure, utilizing the vertical space created by the recess formation. This nested configuration allows multiple coil turns to be packed into a compact volume by exploiting the depth of the recess, thereby increasing the turn count and inductance without expanding the external dimensions.
Data Source
AI summary
A coil component includes a body having a first surface, a coil including a coil pattern having a plurality of turns, a first and second lead-out portions disposed in the body and connected to one end and the other end of the coil, respectively, a first and second dummy lead-out portions disposed in the body and spaced apart from the coil, a first and second external electrodes disposed on the first surface of the body and connected to the first and second lead-out portions, respectively. A coil pattern closest to the first surface among the coil patterns disposed in a region between the first lead-out portion and the first dummy lead-out portion is connected to the first lead-out portion.