Capacitor Metallic Protection Pattern for Crack Prevention
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Solution Overview
Problem
Multilayer ceramic capacitors in electronic devices face challenges in mechanical strength and moisture resistance, particularly in harsh environments, which can lead to electrical instability and reliability issues.
Innovation Solution
A capacitor component design featuring a stacked structure with dielectric layers, internal and external electrodes, and a metal protection pattern on the cover region to prevent cracks and moisture ingress, ensuring improved mechanical strength and electrical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer ceramic capacitor is designed with standard structure, then it achieves basic electrical function, but it has insufficient mechanical strength and poor moisture resistance in harsh environments
Solution Approach 1:
The patent applies preliminary action by forming a protection pattern on the cover region before the capacitor is subjected to harsh environments. This protection pattern is pre-formed during manufacturing to prevent future moisture ingress and mechanical damage, rather than adding protective measures after failure occurs. The protection pattern includes metallic layers and insulating layers that are deposited in advance to create a barrier against environmental degradation.
Solution Approach 2:
The patent employs composite materials by combining multiple layers with different properties in the protection pattern. The cover region includes a first metallic layer, an insulating layer, and a second metallic layer, creating a composite structure that provides both mechanical strength and moisture resistance. This multi-layer composite approach allows each layer to contribute its specific properties: metallic layers provide mechanical strength and conductivity, while the insulating layer provides electrical isolation and environmental protection.
2Reliability
If the capacitor body is made larger to accommodate more internal electrodes, then capacitance increases, but mechanical strength and moisture proof reliability deteriorate
Solution Approach 1:
The patent applies local quality by providing enhanced protection specifically in the cover region rather than uniformly throughout the entire capacitor body. The protection pattern is localized to the regions most susceptible to moisture ingress and mechanical damage, such as the corners and edges of the cover region. This allows the capacitor to maintain high capacitance through the active region while providing targeted mechanical strength and moisture resistance where needed most, without unnecessarily increasing overall size.
Solution Approach 2:
The patent addresses the contradiction by adding a dimensional layer - the protection pattern is formed as a separate layer structure on top of the cover region, rather than trying to increase the size of the internal electrodes. This vertical addition of protective layers allows the capacitor to maintain its compact footprint while enhancing mechanical strength and moisture resistance through the added dimensional layer, effectively decoupling size from reliability enhancement.
3Reliability
If protection pattern is extended to overlap with internal electrodes of different polarity, then moisture proof reliability improves, but electrical characteristics become unstable
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the metallic protection pattern and the internal electrodes of different polarity. This insulating layer acts as a mediator that allows the protection pattern to extend close to or over the internal electrodes without creating direct electrical contact between opposite polarities. The insulating layer maintains electrical isolation while still allowing the metallic layers to provide mechanical strength and crack prevention, thus resolving the contradiction between crack prevention and electrical stability.
Data Source
AI summary
A capacitor component includes a body including a plurality of dielectric layers having a stacked structure, and first and second internal electrodes which are alternately disposed while having the dielectric layer interposed therebetween; and first and second external electrodes formed on an outer surface of the body, and connected to the first and second internal electrodes, respectively, wherein the body includes an active region having capacity by the first and second internal electrodes and a cover region located above and below the active region, the cover region includes a protection pattern of a metal material connected to the first external electrode or the second external electrode, and the protection pattern does not overlap with the internal electrode having a different polarity among the first and second internal electrodes in a thickness direction of the body.