Multilayer Ceramic Capacitor Raised Surfaces for Stable Mounting
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Solution Overview
Problem
Multilayer ceramic capacitors with reduced thickness in the lamination direction experience instability during mounting on a board due to thinner outer peripheral regions, leading to potential shifting and unstable posture.
Innovation Solution
The multilayer ceramic capacitor design includes raised portions on the main surfaces, which are thicker towards the outer periphery, stabilizing the posture during mounting by ensuring even thickness distribution and reducing moisture intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness in the lamination direction of the outer peripheral region is reduced, then the capacitance per unit volume is improved, but the mounting posture stability deteriorates
Solution Approach 1:
The patent applies local quality by creating raised portions at specific locations (outer peripheral regions) of the multilayer body while maintaining the overall reduced thickness design. These raised portions are formed by extending the internal electrodes and dielectric layers locally, providing enhanced mechanical support and stable mounting posture only where needed, without increasing the thickness of the entire capacitor body.
2Volume of moving object
If the outer peripheral region thickness is reduced, then the size is reduced, but the structural stability deteriorates
Solution Approach 1:
The patent segments the multilayer body into different thickness regions: a thinner central region for compactness and reduced volume, and thicker raised portions at the outer periphery for structural stability. This segmentation allows the capacitor to achieve both small overall size and sufficient mechanical strength by distributing the thickness non-uniformly across different functional zones.
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including dielectric layers and internal electrodes alternately laminated therein, and two end surfaces opposing each other in a length direction, and two side surfaces opposing each other in a width direction, and two external electrodes respectively on the two end surfaces of the multilayer body. At least one of two opposed main surfaces of the multilayer ceramic capacitor includes raised portions provided respectively on one side and another side with a middle portion of the main surface interposed therebetween. The raised portions are each raised to become thicker in the lamination direction from the middle portion toward an outer periphery of the main surface.