Laminated Capacitor Strain Suppression via Segmented Electrodes

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Solution Overview

Problem

Existing laminated capacitor structures fail to effectively reduce both equivalent series inductance (ESL) and acoustic noise, presenting opportunities for improvement.

Innovation Solution

A laminated capacitor design featuring a main electrostatic capacitance portion with a higher number of effective dielectric layers, a strain suppression portion with ineffective dielectric layers, and a specific configuration of internal electrodes and external electrodes to reduce strain vibrations and acoustic noise while minimizing ESL.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a conventional laminated capacitor structure is used, then the manufacturing process is simple, but the acoustic noise cannot be effectively reduced

Engineering Contradiction:

Improveacoustic noiseVSAvoidcapacitor structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The capacitor is segmented into a main electrostatic capacitance portion and a strain suppression portion. The strain suppression portion includes ineffective dielectric layers that do not contribute to capacitance but effectively suppress strain vibrations and acoustic noise, thereby reducing harmful factors without requiring complete structural redesign

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the capacitor are assigned different functions: the main electrostatic capacitance portion uses effective dielectric layers for capacitance generation, while the strain suppression portion uses ineffective dielectric layers specifically for vibration suppression. This local differentiation allows targeted reduction of acoustic noise in specific regions

Inventive Principle:

Principle #3Local quality

2Reliability

If effective dielectric layers are stacked to increase capacitance, then the electrostatic capacitance improves, but the strain vibrations and acoustic noise worsen

Engineering Contradiction:

Improveelectrostatic capacitanceVSAvoidstrain vibrations

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The capacitor structure is divided into functional segments: effective dielectric layers for capacitance generation and ineffective dielectric layers for vibration suppression. This segmentation allows the effective dielectric layers to be stacked to increase capacitance while the ineffective dielectric layers simultaneously suppress the strain vibrations generated by these stacks

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The capacitor uses a composite structure combining effective dielectric layers and ineffective dielectric layers. The effective dielectric layers provide high capacitance, while the ineffective dielectric layers provide vibration damping properties. This composite approach allows simultaneous achievement of high reliability capacitance and reduced strain vibrations

Inventive Principle:

Principle #40Composite materials

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 suppresses strain vibrations and reduces acoustic noise while maintaining a reduced ESL, enhancing the reliability and performance of the laminated capacitor.

Implementation Method 1

a main electrostatic capacitance portion including an effective dielectric layer sandwiched between a pair of the internal electrodes connected to different ones of the external electrodes

Methodology Applied

Scientific EffectElectrostatic capacitance: Capacitance

Implementation Method 2

a first sub-electrostatic capacitance portion sandwiched between the main electrostatic capacitance portion and the second principal surface; the first sub-electrostatic capacitance portion includes a plurality of ineffective dielectric layers

Methodology Applied

Scientific EffectVibration suppression: Damping

Data Source

PatentUS9653214B2Laminated capacitor and laminated capacitor series and laminated capacitor mounted body including capacitor

Publication Date: 2017.05.16 MURATA MFG CO LTD

AI summary

In a laminated capacitor, a distance between an inner internal electrode at a first principal surface side, from a pair of internal electrodes that sandwich an effective dielectric layer located closest to a second principal surface side in a first sub-electrostatic capacitance portion, and a second principal surface is smaller than or equal to a distance between an internal electrode located closest to the second principal surface side in a main electrostatic capacitance portion and the inner internal electrode.