Multilayer Ceramic Capacitor With Overlapping Electrodes
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in miniaturization and high-frequency noise removal due to high equivalent series inductance (ESL), which hinders their performance as bypass capacitors in modern electronic devices.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic body with dielectric layers, internal electrodes, an oxide film, and external electrodes, where the oxide film covers overlapped insulating lead-out portions to form composite metal oxide regions, reducing ESL and increasing capacitance, and an insulating layer is optionally included to enhance mounting and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the multilayer ceramic capacitor is miniaturized to meet electronic product size requirements, then the device size is reduced, but the capacitance decreases and equivalent series inductance increases
Solution Approach 1:
The patent introduces an additional overlapping dimension by extending internal electrodes beyond dielectric layer boundaries to create overlapping regions. This dimensional extension allows capacitance to be increased without proportionally increasing device volume, as the overlapping electrodes generate additional capacitive coupling in the overlapping region while maintaining compact overall dimensions.
Solution Approach 2:
The patent applies composite material structures by forming composite metal oxide regions at the edges of internal electrodes through reaction with oxide films. These composite regions at the electrode edges reduce equivalent series inductance by improving current distribution and reducing edge effects, thereby enhancing high-frequency performance without increasing device size.
2Ease of manufacture
If conventional internal electrode structures are used, then the manufacturing process is simple, but equivalent series inductance is high which hinders high frequency noise removal
Solution Approach 1:
The patent modifies the geometric parameters of internal electrodes by extending them beyond dielectric layer boundaries to create overlapping regions. This parameter change increases capacitance and reduces equivalent series inductance, improving high-frequency noise removal capability while maintaining compatibility with conventional manufacturing processes through standard printing and firing techniques.
Solution Approach 2:
The patent applies local quality enhancement by forming composite metal oxide regions specifically at the edge portions of internal electrodes where they overlap with oxide films. This localized treatment at critical electrode edges reduces equivalent series inductance without requiring changes to the overall manufacturing process, thereby improving high-frequency performance while maintaining manufacturing simplicity.
3Reliability
If internal electrodes are extended beyond dielectric layers to increase capacitance, then capacitance increases, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by forming oxide films on dielectric layer surfaces before forming internal electrodes that extend beyond the dielectric layers. The oxide films are prepared in advance to define the boundaries and properties of the overlapping regions, which guides subsequent electrode formation and ensures proper alignment without requiring high-precision positioning during electrode fabrication.
Solution Approach 2:
The patent uses oxide films as intermediary layers between dielectric layers and internal electrodes. These oxide films serve as mediators that facilitate controlled interaction between extending electrodes and dielectric surfaces, enabling precise formation of composite metal oxide regions at electrode edges while reducing the need for high-precision electrode alignment during manufacturing.
4Reliability
If oxide film is formed on dielectric layer surfaces, then ESL is reduced, but the device complexity increases
Solution Approach 1:
The patent applies multi-functionality to oxide films by assigning them multiple roles: (1) serving as a base layer for forming composite metal oxide regions at electrode edges, (2) directly contributing to capacitance through overlapping with extended internal electrodes, and (3) reducing equivalent series inductance through the composite regions. This multi-functional use of oxide films reduces ESL without requiring additional separate structural elements, thereby avoiding increased device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves low equivalent series inductance, enhances capacitance, and improves mounting efficiency on circuit boards, effectively addressing the need for miniaturization and high-frequency noise removal in electronic components.
Implementation Method 1
having a composite metal oxide region formed in an exposed edge portion thereof
Implementation Method 2
overlapped with the first insulating lead-out portion to form additional capacitance
Data Source
AI summary
A multilayer ceramic electronic component includes: a ceramic body including dielectric layers; an oxide film formed on one surface of the ceramic body; first and second external electrodes formed on both sides of the oxide film on one surface of the ceramic body; a first internal electrode formed on the dielectric layer and including a first electrode lead-out portion exposed to the first external electrode and a first insulating lead-out portion exposed to the oxide film and having a composite-metal-oxide region formed in an exposed edge portion thereof; a second internal electrode facing the first internal electrode, having the dielectric layer interposed therebetween, and including a second electrode lead-out portion exposed to the second external electrode and a second insulating lead-out portion exposed to the oxide film, having a composite-metal-oxide region formed in an exposed edge portion thereof, and overlapped with the first insulating lead-out portion to form additional capacitance.