Multilayer Ceramic Capacitor Electrode Extension Curvature

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Solution Overview

Problem

Multilayer ceramic capacitors face issues with interface peeling during the cutting step, which reduces yield and affects product quality.

Innovation Solution

The design includes internal electrodes with extension portions that have specific slope and bent configurations, ensuring that a virtual connection line intersects the effective layer portion, thereby reducing stress concentrations and preventing interface peeling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If internal electrodes have conventional straight extension portions, then manufacturing is simple, but interface peeling occurs during cutting reducing yield

Engineering Contradiction:

Improveadhesive force between internal electrode and dielectric layerVSAvoidcomplexity of internal electrode configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The extension portion of the internal electrode is designed with a curved configuration including a first slope portion, a bent portion, and a second slope portion, replacing conventional straight extensions. This curvature distributes stress more evenly during cutting, preventing interface peeling between the internal electrode and dielectric layer, thereby improving reliability without excessive complexity

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The extension portion is segmented into distinct functional regions: a first slope portion extending from the counter portion, a bent portion connecting to a second slope portion, and the second slope portion extending toward the end surface. This segmentation allows each portion to manage stress differently, preventing peeling while maintaining manufacturability

Inventive Principle:

Principle #1Segmentation

2Productivity

If conventional internal electrode design is used, then manufacturing process is simple, but interface peeling reduces product yield

Engineering Contradiction:

Improveyield of multilayer ceramic capacitorVSAvoidprecision of internal electrode shape

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The shape parameters of the extension portion are precisely controlled with specific geometric definitions: the first slope portion has a defined angle, the bent portion has a specific curvature radius, and the second slope portion has a defined angle. These parameter specifications ensure consistent stress distribution during cutting, preventing interface peeling and improving yield while maintaining manufacturing precision

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250299880A1Multilayer ceramic electronic component

Publication Date: 2025.09.25 MURATA MFG CO LTD

AI summary

A multilayer ceramic electronic component includes a first extension portion including a bent portion in a cross section. The multilayer body is divided into four regions by a straight line passing through a middle portion of the multilayer body in a lamination direction and a straight line passing through a middle portion of the multilayer body in a length direction, and a region adjacent to a first main surface and a first end surface among the divided four regions is defined as a first reference region, and a regression line derived based on values of x and y with respect to the bent portion in a reference region is defined as a virtual connection line, the virtual connection line intersects an effective layer portion.