Multilayer Ceramic Capacitor Impact Absorption Layer

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Solution Overview

Problem

Multilayer ceramic capacitors face challenges in miniaturization and increased capacity demands due to high equivalent series resistance (ESR) and equivalent series inductance (ESL), which hinder their function as bypass capacitors in high-frequency electronic devices.

Innovation Solution

A multilayer ceramic capacitor design featuring a ceramic body with internal electrodes and external electrode layers, where an impact absorption layer with a thermosetting polymer is exposed to prevent increased ESR, and a method of fabrication involving sintered electrode layers and extended electrode and impact absorption layers to maintain low ESR and enhance impact absorption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the capacitor is miniaturized to meet small size demands, then the size is reduced, but the equivalent series resistance increases

Engineering Contradiction:

Improvecapacitor sizeVSAvoidequivalent series resistance

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The external electrode structure is segmented into multiple functional layers: electrode layer, impact absorption layer, and plating layer. This segmentation allows each layer to perform its specific function - the electrode layer provides electrical connection, the impact absorption layer prevents ESR increase during impact, and the plating layer provides solderability - thereby maintaining low ESR in miniaturized capacitors

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode and impact absorption layers are extended from the end surfaces to the main surfaces or side surfaces of the ceramic body, utilizing three-dimensional space more effectively. This dimensional extension increases the effective electrode area without increasing the overall capacitor volume, thus maintaining low ESR in miniaturized designs

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If the capacitor is miniaturized to meet small size demands, then the size is reduced, but the impact absorption rate deteriorates

Engineering Contradiction:

Improvecapacitor sizeVSAvoidimpact absorption rate

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The impact absorption layer is formed in advance on the electrode layer before final assembly. This preliminary formation of the impact absorption layer ensures that when impact occurs during soldering or handling, the damage is already mitigated, preventing ESR increase and maintaining reliability in miniaturized capacitors with limited space for impact protection

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The external electrode uses a composite structure combining conductive materials (electrode layer) with impact-absorbing materials (impact absorption layer containing rubber particles or resin). This composite material approach provides both electrical conductivity and impact absorption capability in the miniaturized capacitor structure

Inventive Principle:

Principle #40Composite materials

3Reliability

If the electrode layer is extended to improve electrical connection, then the electrical connectivity is improved, but the device complexity increases

Engineering Contradiction:

Improveelectrical connectivityVSAvoidelectrode structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The electrode layer and impact absorption layer are formed simultaneously or in sequence as an integrated external electrode structure, merging the electrical connection function and impact protection function into a single unified component. This reduces device complexity while maintaining improved electrical connectivity and impact absorption

Inventive Principle:

Principle #5Merging (Combining)

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 effectively reduces equivalent series resistance, improves impact absorption, and maintains electrical connectivity, ensuring reliable performance in miniaturized and high-capacity applications.

Implementation Method 1

an impact absorption layer formed on the electrode layer so that an edge of the electrode layer is exposed

Methodology Applied

Scientific EffectImpact absorption: Damping

Implementation Method 2

electrode layers formed on the first and second end surfaces of the ceramic body and electrically connected to the plurality of internal electrodes

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

a method of fabrication involving sintered electrode layers

Methodology Applied

Scientific EffectSintering: Sintering

Data Source

PatentUS10163568B2Multilayer ceramic capacitor, method of fabrication thereof and circuit board having electronic component mounted thereon

Publication Date: 2018.12.25 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

There is provided a multilayer ceramic capacitor including a ceramic body including a plurality of dielectric layers and having first and second main surfaces opposing each other, first and second side surfaces opposing each other, and first and second end surfaces opposing each other, a plurality of internal electrodes having the dielectric layer interposed therebetween, electrode layers formed on the first and second end surfaces of the ceramic body and electrically connected to the plurality of internal electrodes, and an impact absorption layer formed on the electrode layer so that an edge thereof is exposed.