Multilayer Ceramic Capacitor Electrode Retraction Design
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges with low voltage endurance and decreased insulation resistance due to internal electrode exposure and thin insulating layers, which lead to mechanical strength issues and structural defects.
Innovation Solution
A multilayer electronic component design featuring internal electrode layers with varied retraction distances from dielectric layers, preventing contact between electrode layers and enhancing insulation resistance, combined with nonconductive portions and specific materials like Si and Ba in the insulating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the insulating layer becomes thinner to increase use efficiency of electrode materials, then the electrostatic capacity and miniaturization are improved, but the insulation resistance decreases and electric field concentration increases
Solution Approach 1:
The patent applies local quality by creating non-uniform retraction distances of internal electrodes at different positions. Specifically, the retraction distance varies in the thickness direction of the insulating layer, with smaller retraction distances where the insulating layer is thinner and larger retraction distances where the insulating layer is thicker. This localized adjustment prevents electric field concentration and maintains insulation resistance while enabling miniaturization.
2Quantity of substance
If internal electrodes are exposed to side surfaces to increase use efficiency, then the electrostatic capacity is improved, but the voltage endurance decreases
Solution Approach 1:
The patent changes the geometric parameters of internal electrodes by controlling their retraction distances from the side surfaces of the ceramic sintered body. By adjusting the retraction distance parameter, the patent optimizes the balance between electrode material utilization and voltage endurance, preventing electrode exposure that would cause low voltage endurance while maintaining high electrostatic capacity.
3Reliability
If conductive layers intrude uniformly into the inner side from side surfaces to enhance insulation withstand voltage, then the insulation resistance is improved, but the mechanical strength of ceramic layers decreases and structural defects occur
Solution Approach 1:
The patent applies asymmetry by making the retraction distances of internal electrodes non-uniform. Instead of uniform intrusion, the retraction distances vary in the thickness direction of the insulating layer, creating an asymmetric structure that prevents electric field concentration while maintaining mechanical strength and avoiding structural defects like cracks and delamination.
Data Source
AI summary
A multilayer electronic component includes an element body having internal electrode layers and dielectric layers. These are substantially parallel to a plane including a first axis and a second axis and are alternately laminated along a third axis direction. Side surfaces oppositely facing in the first axis direction are respectively equipped with an insulating layer. End surfaces facing each other in the second axis direction are respectively equipped with an external electrode. End portions in the first axis direction of the internal electrode layers are recessed from end portions in the first axis direction of the dielectric layers to an inner side along the first axis direction. The retraction distances are varied at a predetermined range in each layer of the internal electrode layers.