Multilayer Ceramic Capacitor Structure for Short-Circuit Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors often experience short circuiting between internal electrode layers due to surface contact issues, which existing technologies have not adequately addressed.
Innovation Solution
Incorporating a segregation of silica (Si) at the ends of internal electrode layers, where the average particle size of dielectric particles is smaller than in the central portion, to prevent moisture penetration and reduce short circuiting, while maintaining high capacitance through controlled dielectric ceramic layer thickness and particle distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of laminated dielectric ceramic layers is increased and thickness is reduced to achieve high capacitance, then capacitance increases, but short circuiting between internal electrode layers becomes more likely
Solution Approach 1:
The patent applies local quality by creating a segregation of Si in the dielectric ceramic layer specifically at the end portions of internal electrode layers in the width direction. This localized modification of particle size and composition at critical areas (ends of electrode layers) provides enhanced insulation where short circuiting is most likely to occur, while maintaining the overall thin-layer structure needed for high capacitance.
2Quantity of substance
If the average particle size of dielectric particles is increased parallel to internal electrode layers to increase capacitance, then capacitance increases, but short circuiting between internal electrode layers becomes more likely
Solution Approach 1:
The patent implements local quality by establishing a spatial variation in dielectric particle size within the dielectric ceramic layer. Specifically, the average particle size at the end portions of internal electrode layers in the width direction is made smaller than in the central portion. This localized particle size control prevents short circuiting at vulnerable end regions while maintaining larger particles in central areas to preserve capacitance.
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including the dielectric ceramic layers and the internal electrode layers which are laminated, and external electrodes connected to the internal electrode layers. The multilayer body includes segregation including Si as a main component in a vicinity of an end of the internal electrode layer in a width direction. An average particle size of the dielectric particles in the vicinity of the end of the internal electrode layer in the width direction in the dielectric ceramic layer is smaller than an average particle size of a dielectric particles in a central portion of the internal electrode layer in the width direction in the dielectric ceramic layer.