Multilayer Coil Electrode Marking to Suppress Stray Capacitance
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Solution Overview
Problem
Existing multilayer coil components face challenges in reducing stray capacitance while ensuring that the discrimination marks for outer electrode formation are visible, even in cases of cutting misalignment, without increasing stray capacitance.
Innovation Solution
A multilayer coil component design featuring a discrimination mark with a cutout part on the mark conductor pattern, which is large enough to be exposed and positioned on the surface of the multilayer body, allowing for effective automation of outer electrode formation without increasing stray capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the size of the discrimination mark is increased to ensure visibility after cutting misalignment, then the mark can be clearly exposed, but stray capacitance increases
Solution Approach 1:
The discrimination mark is segmented into multiple conductor patterns arranged in a matrix. Each conductor pattern is separated by insulating layers, dividing the overall mark structure into electrically isolated units. This segmentation allows the mark to be large enough for visibility while preventing continuous conductive paths that would increase stray capacitance.
Solution Approach 2:
Different regions of the discrimination mark have different electrical properties. The mark conductor patterns are positioned and sized to provide visual identification, while the spaces between them are filled with insulating material. This creates local variations in conductivity, ensuring the mark is visible without creating excessive capacitive coupling to the coil.
2Object-generated harmful factors
If the outer electrodes are formed only on parts of the end surfaces and side surfaces, then stray capacitance is reduced, but it becomes difficult to discriminate where the outer electrodes are to be formed
Solution Approach 1:
The discrimination mark serves as an intermediary visual indicator that does not directly participate in electrical conduction. It provides clear positional information for outer electrode formation through its conductor patterns, while being electrically isolated by insulating layers. This intermediary structure enables automated detection without requiring the outer electrodes themselves to provide visual cues.
Solution Approach 2:
The discrimination mark with its conductor patterns is formed in advance during the multilayer body fabrication process, before the outer electrodes are applied. This preliminary action establishes clear visual boundaries that guide subsequent outer electrode formation, enabling automated processes to accurately identify where electrodes should be placed without increasing stray capacitance.
Data Source
AI summary
A multilayer coil component includes a multilayer body including plurality of stacked insulating layers, a coil, and first and second connection conductors thereinside; and first and second outer electrodes that are electrically connected to the coil. The coil is configured by electrically connecting a plurality of coil conductors, which are stacked together with the insulating layers, to one another. The multilayer body has first and second end surfaces, which face each other in a length direction, first and second main surfaces, which face each other in a height direction perpendicular to the length direction, and first and second side surfaces, which face each other in a width direction perpendicular to the length and height directions. The first outer electrode covers at least part of the first end surface and extends from the first end surface and cover part of the first main surface.