Coil Component Marking Embedding for Miniaturization
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Solution Overview
Problem
Existing coil components face challenges in achieving lightness, thinness, and smallness due to protruding marking portions and non-selective insulating layer formation, which increase component size and hinder miniaturization in electronic devices.
Innovation Solution
A coil component design featuring a support substrate with a coil portion, external electrodes, a marking portion on one surface, and a first insulating layer with an opening to expose the marking portion, ensuring the marking portion's thickness is less than or equal to the insulating layer's thickness, and selective insulating layer formation on surfaces without markings, using methods like inkjet printing and spray coating to prevent protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a marking portion is formed using a screen-printing method, then the marking portion can identify the mounting direction, but the marking portion protrudes from the surface and increases the component size
Solution Approach 1:
The insulating layer is formed with a non-uniform thickness: a first insulating layer with greater thickness is provided at the marking portion region, while a second insulating layer with lesser thickness is provided at other regions. This local variation in insulating layer thickness allows the marking portion to be embedded without protruding, while maintaining its identification function
Solution Approach 2:
The marking portion is formed on the substrate before the insulating layer is applied. This preliminary formation allows the insulating layer to be deposited over the marking portion, embedding it within the component structure and preventing protrusion while preserving the marking's visibility for mounting direction identification
2Reliability
If an insulating layer is formed using a spray method, then the insulating layer can cover the body surface, but it extends to the marking portion region and covers the marking portion
Solution Approach 1:
The insulating layer is formed with spatially varying thickness: a first insulating layer with greater thickness at the marking portion region and a second insulating layer with lesser thickness at other regions. This local differentiation ensures the marking portion remains visible while achieving comprehensive surface coverage and insulation
Solution Approach 2:
The insulating layer is segmented into two distinct regions: a first insulating layer region covering the marking portion with greater thickness, and a second insulating layer region covering other surfaces with lesser thickness. This segmentation allows simultaneous achievement of marking visibility and complete insulation coverage
Data Source
AI summary
A coil component includes a support substrate, a coil portion disposed on at least one surface of the support substrate, a body, in which the support substrate and the coil portion are disposed, having one surface and the other surface opposing each other, a first external electrode and a second external electrode disposed on the other surface of the body to be spaced apart from each other and connected to the coil portion, a marking portion disposed on the one surface of the body, and a first insulating layer disposed on the one surface of the body and having an opening exposing the marking portion. The marking portion has a thickness less than or equal to a thickness of the first insulating layer.