Multilayer Ceramic Capacitor Structure to Minimize Firing Warpage

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Solution Overview

Problem

Existing multilayer ceramic capacitors face issues with warpage during firing, leading to electrical connection failures and mounting defects, and their complex structures result in lower yield and misaligned cut positions.

Innovation Solution

A multilayer ceramic capacitor with a simple and thinner structure is designed, featuring a body with alternately stacked internal and external electrodes, and dummy extensions for enhanced connection reliability, minimizing warpage without compromising mountability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a complex multilayer structure is used to achieve electrical connection, then connectivity is improved, but warpage during firing increases leading to lower yield

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidmultilayer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The capacitor structure is segmented into distinct functional regions: internal electrodes for capacitance, external electrodes for connection, and extension portions for bridging. This segmentation allows each component to be optimized independently, reducing overall structural complexity while maintaining electrical connection reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The extension portions of internal electrodes extend in the thickness direction (first direction) beyond the dielectric layer stack, creating a three-dimensional electrode arrangement. This dimensional transition allows electrical connections to be established without requiring complex lateral routing, thereby reducing warpage during firing.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If extensions are added to internal electrodes to improve connection, then mountability is improved, but structural complexity increases

Engineering Contradiction:

ImprovemountabilityVSAvoidelectrode structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The extension portions are merged with the external electrodes, creating a continuous conductive path from the internal electrode through the dielectric layer to the external electrode. This merging eliminates the need for separate connection structures, improving mountability while actually reducing overall structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250132096A1Multilayer ceramic capacitor and multilayer ceramic capacitor mounting structure

Publication Date: 2025.04.24 KYOCERA CORP

AI summary

A multilayer ceramic capacitor includes a body including first and second internal electrodes alternately stacked in a first direction with a dielectric layer between them and first and second electrodes alternately stacked in the first direction with the dielectric layer between them, first and second external electrodes on the first surface, and third and fourth external electrodes on the second surface. The first internal electrode includes a first portion including a first capacitance portion and first and second extensions. The second internal electrode includes a second portion including a second capacitance portion and third and fourth extensions. The first electrode includes first and second inspection electrodes. The second electrode includes third and fourth inspection electrodes. The first and second extensions are connected to the first and third external electrodes. The third and fourth extensions are connected to the second and fourth external electrodes.