Substrate-Mounted MLCC Electrode Layout for Low Height and High Capacitance
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Solution Overview
Problem
Existing substrate-equipped multilayer ceramic capacitors face challenges in reducing height while maintaining high capacitance, particularly due to the increase in height when the number of laminated dielectric ceramic layers and internal electrodes is increased.
Innovation Solution
The design includes a multilayer ceramic capacitor with specific dimensions and external electrodes that overlap the substrate surfaces in a manner that reduces the dimension in the second direction, allowing for a reduction in height while maintaining high capacitance, and a substrate with lands and bonding material to secure the capacitor, minimizing stress transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of laminated dielectric ceramic layers and internal electrodes is increased to achieve high capacitance, then the capacitance is improved, but the height of the multilayer ceramic capacitor increases
Solution Approach 1:
The patent transitions from vertical stacking (increasing layers in the height direction) to horizontal expansion (increasing the area of individual layers in the planar directions). By making the internal electrodes extend further in the first and second directions orthogonal to the lamination direction, the capacitance increases without increasing the height, effectively moving the capacity expansion to another dimension.
Solution Approach 2:
The patent applies different dimensional characteristics to different parts of the capacitor structure. The internal electrodes have extended dimensions in the first and second directions (horizontal expansion) while maintaining controlled height, creating a non-uniform dimensional distribution that optimizes both capacitance and height requirements simultaneously.
2Length of moving object
If the height of the multilayer ceramic capacitor is reduced to meet miniaturization requirements, then the height is improved, but the capacitance decreases
Solution Approach 1:
The patent compensates for reduced height by expanding the internal electrode area in the first and second directions (horizontal dimensions). This dimensional substitution allows the capacitance to be maintained or increased even when the number of layers and overall height are reduced, effectively trading vertical space for horizontal space.
Solution Approach 2:
The patent changes the dimensional parameters of the internal electrodes, specifically increasing their extension in the first and second directions while reducing or controlling the height parameter. This parameter transformation allows the capacitance formula C = εA/d to be optimized by increasing area A through horizontal expansion while keeping height d small.
3Length of moving object
If the external electrodes are made to overlap both first and second substrate surfaces to reduce height, then the height is improved, but stress transmission to the capacitor increases
Solution Approach 1:
The patent creates an asymmetric configuration where the external electrodes have different overlap dimensions with the first and second substrate surfaces. By making the overlap dimension with the first surface smaller than with the second surface, the structure achieves height reduction while asymmetrically distributing stress, with the larger overlap providing better stress isolation for the capacitor.
Data Source
AI summary
A substrate-equipped multilayer ceramic capacitor includes a multilayer ceramic capacitor and a substrate. A dimension in a second direction of a portion of a first external electrode overlapping with a first surface as viewed in a lamination direction is smaller than a dimension in the second direction of a portion of the first external electrode overlapping with a second surface as viewed in the lamination direction. The first surface and the second surface are located on opposite sides with a first substrate surface interposed therebetween.