Coil Component Recessed Shielding and Electrode Design
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Solution Overview
Problem
There is a need for a coil component that is reduced in size and thickness, with an easily formable electrode structure on the lower surface and a shielding structure that minimizes magnetic flux leakage, while maintaining high performance in electronic devices.
Innovation Solution
The coil component features a body with recesses along its edges to expose lead-out portions, external electrodes, and a shielding layer on an insulating layer, which is connected to a connection electrode, allowing for efficient magnetic flux shielding and reduced size without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding can is used to envelop electronic components, then electromagnetic interference shielding is improved, but device size and complexity increase
Solution Approach 1:
The shielding layer is integrated within the coil component structure itself, nested between the coil portion and the external environment. This eliminates the need for separate shielding cans while maintaining EMI shielding effectiveness, thereby reducing overall device size and complexity
Solution Approach 2:
The shielding function is merged with the coil component structure by forming the shielding layer as part of the component's internal architecture. This integration combines multiple functions (coil operation and EMI shielding) into a single structure, reducing the number of separate components needed
2Ease of operation
If electrode structures are formed on lower surfaces, then electrical connection is improved, but manufacturing complexity increases
Solution Approach 1:
Lead-out portions are extended from the coil portion before final assembly, and recesses are pre-formed in the body to receive external electrodes. This preliminary preparation of connection structures simplifies subsequent manufacturing steps and facilitates reliable electrical connections
Solution Approach 2:
The external electrodes serve as intermediary elements that bridge the connection between the internal coil structure and external circuitry. These electrodes are disposed in recesses that provide mechanical support and electrical contact, simplifying the overall connection process
3Volume of moving object
If coil component size is reduced, then device integration is improved, but magnetic flux leakage increases
Solution Approach 1:
The shielding layer is nested within the compact coil component structure, forming an internal barrier that contains magnetic flux. This nested configuration allows effective flux containment within a reduced overall component volume, preventing leakage to surrounding areas
Solution Approach 2:
The shielding layer is strategically positioned in specific locations where magnetic flux leakage is most likely to occur. By concentrating shielding material in critical areas rather than uniformly throughout, the component maintains small size while effectively controlling flux leakage at key interfaces
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces the size and thickness of the coil component while enhancing its ability to shield magnetic flux leakage, improving reliability and performance by increasing the contact area between electrodes and lead-out portions, and maintaining high performance in electronic devices.
Implementation Method 1
A shielding layer is disposed on the external insulating layer and in the opening and is connected to the connection electrode
Data Source
AI summary
A coil component includes a body and a coil portion disposed in the body and including first and second lead-out portions. Recesses are disposed along edges of one surface of the body, and expose the first and second lead-out portions to internal walls and lower surfaces of the recesses. First and second external electrodes are disposed in the recesses, and are connected to the first and second lead-out portions. A third external electrode is disposed in the recesses, and is connected to a connection electrode disposed on side surfaces of the body and on another surface of the body opposite to the one surface. An external insulating layer covers the connection electrode, and has an opening exposing at least a portion of the connection electrode. A shielding layers is disposed on the external insulating layer and in the opening and connects to the connection electrode.