Multilayer Coil Pad Layout for Connection Reliability and Compactness
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Solution Overview
Problem
Existing multilayer coil components face challenges in maintaining desired characteristics and compactness while ensuring reliable electrical connections, particularly due to the exposure of pad portions during manufacturing and the reduction in inner diameter.
Innovation Solution
The design includes coil conductors with overlapping regions and inclined pad portions that overhang away from the coil axis, ensuring contact area with connecting conductors and maintaining distance from the element body, thereby preserving the inner diameter and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area of the pad portion is increased to ensure reliable electrical connection, then the reliability of electrical connection between the pad portion and connecting conductor is improved, but the inner diameter of the coil is reduced due to pad portion overhang
Solution Approach 1:
The pad portion is designed to overhang in the radial direction (away from the coil axis) rather than extending in the axial direction. This dimensional change allows the pad portion to achieve sufficient contact area with the connecting conductor while maintaining the axial length and inner diameter of the coil, thus resolving the contradiction between connection reliability and coil dimensions
Solution Approach 2:
The pad portion is configured with different geometric characteristics in different regions: it has a larger area for contact with the connecting conductor while its overhang is directed radially outward. This local quality differentiation allows the pad portion to fulfill both the electrical connection requirement and the dimensional constraint simultaneously
2Volume of moving object
If the distance between the side surface of the element body and the coil conductor is reduced to make the component compact, then the compactness of the multilayer coil component is improved, but the pad portion may be exposed from the side surface during manufacturing
Solution Approach 1:
The pad portion overhangs radially outward from the coil conductor rather than extending axially toward the side surface of the element body. This dimensional reorientation allows the pad portion to be accessible for connection while remaining protected from exposure during manufacturing, enabling compact design without compromising manufacturing precision
Data Source
AI summary
In a multilayer coil component, a plurality of coil conductors are stacked in a coil axis direction. A connecting conductor connects the coil conductors adjacent to each other in the coil axis direction. First, second, and third coil conductors are arranged in order in the coil axis direction. A main body portion extends in a circumferential direction of the coil axis. Pad portions are connected to the main body portion, are connected to the first coil conductor via the connecting conductor, overhang from the third coil conductor in a direction away from the coil axis when viewed from the coil axis direction, and are inclined with respect to a virtual plane orthogonal to the coil axis direction.