Multilayer Ceramic Component Asymmetric Electrode Toppling Prevention
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Solution Overview
Problem
Multilayer ceramic electronic components with high capacitance tend to topple over when mounted on a board, leading to increased failure rates and short defects due to their thickness being greater than their width, which existing technologies have not adequately addressed.
Innovation Solution
A multilayer ceramic electronic component design featuring a hexahedral ceramic body with dielectric layers and internal electrodes, where the width of external electrodes is less than the ceramic body and embedded in the main surfaces, ensuring a thickness-to-width ratio greater than 1 and preventing external electrodes on side surfaces, thereby reducing the likelihood of toppling and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of dielectric layers is reduced and the number of stacked layers is increased to achieve high capacitance and miniaturization, then the capacitance increases and size decreases, but the thickness of the component becomes greater than its width, causing it to topple over during mounting
Solution Approach 1:
The patent applies asymmetry by making the external electrodes narrower than the ceramic body in the width direction, creating an asymmetric configuration where the electrodes do not extend to the side surfaces. This asymmetric design shifts the center of gravity and reduces the toppling moment, allowing the component to maintain stability even with a thickness greater than width during mounting processes.
2Reliability
If the external electrodes are made wider to improve electrical connection, then the electrical connection improves, but the component becomes more prone to toppling over
Solution Approach 1:
The patent applies local quality by optimizing the external electrode dimensions to have a width less than the ceramic body width, creating different local characteristics: the electrode width is sufficient for reliable electrical connection to the circuit board but deliberately limited to prevent toppling. This local differentiation allows the component to satisfy both electrical connection requirements and mounting stability requirements simultaneously.
3Reliability
If the number of stacked dielectric layers is increased to achieve high capacitance, then the capacitance increases, but the component thickness increases, leading to a higher risk of short defects during mounting
Solution Approach 1:
The patent applies asymmetry by configuring the external electrodes to be narrower than the ceramic body, creating an asymmetric structure that prevents the electrodes from contacting adjacent components even when the component topples during mounting. This asymmetric configuration allows high capacitance to be achieved through increased layer stacking while mitigating the risk of short defects that would otherwise result from the increased thickness.
Data Source
AI summary
A multilayer ceramic electronic component includes a hexahedral ceramic body including dielectric layers and having first and second main surfaces opposing each other in a thickness direction, first and second end surfaces opposing each other in a length direction, and first and second side surfaces opposing each other in a width direction; first and second internal electrodes stacked to have the dielectric layer interposed therebetween within the ceramic body and alternately exposed through the first and second end surfaces; and first and second external electrodes electrically connected to the first and second internal electrodes, respectively, and including first and second head parts formed on the first and second end surfaces, wherein width of the first and second head parts is less than width of the ceramic body, and when length, width and thickness of the ceramic body are defined as L, W, and T, respectively, T/W>1.0 is satisfied.