Multilayer Ceramic Capacitor Asymmetric Side Gap Design
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Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in achieving a reduction in size and increased capacitance while minimizing interlayer peeling during the cutting process due to variations in side gap dimensions, which can lead to displacement of the cutting blade and separation of printed conductive pastes.
Innovation Solution
The multilayer ceramic capacitor design includes equal or substantially equal dimensions of the inner layer portion in the width direction on both main surfaces, with a second side gap portion that gradually increases from the middle toward one main surface, and oblique alignment of conductive paste ends to accommodate blade deviation, reducing the likelihood of interlayer peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the side gap portion is increased from the upper side to the lower side to tolerate cutting blade displacement, then interlayer peeling is reduced, but the dimension of the internal electrode layer in the width direction becomes small, resulting in reduced capacitance
Solution Approach 1:
The patent applies local quality by making the side gap width non-uniform only on one side (the side where blade displacement occurs) while keeping the other side's side gap width constant. This localized variation tolerates cutting blade displacement in the critical area without unnecessarily reducing the internal electrode layer width across the entire structure, thereby maintaining capacitance while preventing interlayer peeling.
Solution Approach 2:
The patent introduces asymmetry in the side gap dimensions, where the side gap width on one side gradually increases from upper to lower layers to accommodate cutting blade displacement, while the other side maintains equal width. This asymmetric design allows the structure to tolerate displacement in one direction without sacrificing capacitance that would result from symmetric widening on both sides.
2Volume of moving object
If the multilayer body size is reduced to meet miniaturization demands, then device size is decreased, but the dimension of the internal electrode layer becomes smaller, making the structure more susceptible to interlayer peeling during cutting
Solution Approach 1:
The patent applies local quality by concentrating the side gap width variation only on one side of the multilayer body where cutting blade displacement is most likely to occur. This localized approach allows the structure to maintain small overall dimensions for miniaturization while providing enhanced peeling resistance only in the critical cutting zone, rather than requiring uniform dimensional increases throughout the entire device.
Data Source
AI summary
A multilayer ceramic capacitor includes two outer layer portions on sides of an inner layer portion, first and second side gap portions respectively adjacent to first and second lateral surfaces, and external electrodes respectively on first and second end surfaces. A dimension of the inner layer portion in a width direction is equal or substantially equal between first and second main surfaces in a lamination direction. In a cross section of lamination and width directions in a middle portion in a length direction, a dimension of the first side gap portion in the width direction is equal or substantially equal between sides on the first and second main surfaces in the lamination direction, and a dimension of the second side gap portion in the width direction gradually increases from the middle portion in the lamination direction toward the side of the second main surface.