Multilayer Capacitor Electrostrictive Vibration Suppression

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Solution Overview

Problem

Multilayer capacitors using ferroelectric ceramic materials experience electrostrictive vibration due to electrostriction, which can transmit unwanted noise, and existing solutions either restrict material choices or complicate manufacturing, limiting their effectiveness in suppressing vibrations across various structures.

Innovation Solution

A multilayer capacitor design featuring a capacitor area and a suppression area with specific thickness ratios and internal electrode arrangements to reduce electrostriction, allowing for effective noise suppression without material constraints, and including marking electrodes for accurate positioning and mounting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If electrode connection parts are added to separate the board from the capacitor's main body, then vibration transmission is reduced, but manufacturing cost increases and manufacturing processes become complicated

Engineering Contradiction:

Improvevibration transmissionVSAvoidmanufacturing process complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent extracts the vibration transmission problem from the overall capacitor structure by creating a specific separation between the capacitor body and board through electrode lead arrangement, eliminating the need for additional vibration isolation components

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The electrode leads serve multiple functions: electrical connection and vibration isolation. The ordinary electrode leads are designed to provide both electrical connectivity and mechanical separation from the board, combining two functions into a single component

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If electrode connection parts are added to separate the board from the capacitor's main body, then vibration transmission is reduced, but manufacturing cost increases

Engineering Contradiction:

Improvevibration transmissionVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention uses the existing electrode leads, which are inexpensive and already part of the capacitor structure, to achieve vibration isolation without requiring expensive additional components

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Object-affected harmful factors

If material constraints are imposed to suppress electrostrictive vibration, then vibration suppression is achieved, but material selection flexibility is reduced

Engineering Contradiction:

Improveelectrostrictive vibrationVSAvoidmaterial selection flexibility

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent introduces the electrode leads as an intermediary element between the capacitor body and the board. This mediator provides vibration isolation through its mechanical arrangement rather than through material property modification, allowing any ferroelectric material to be used

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention replaces material-based vibration suppression (which would require changing the ferroelectric material properties) with a mechanical arrangement of electrode leads that provides vibration isolation through physical separation and damping

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 electrostrictive vibration and noise across various structures, including general-purpose designs, without material restrictions, ensuring accurate placement and reduced manufacturing complexity.

Implementation Method 1

When an electric field is applied to such ferroelectric ceramic material, mechanical distortion, namely, electrostriction, occurs in the material. Accordingly, when electric voltage is applied to a multilayer capacitor made of ferroelectric ceramic material, the capacitor vibrates due to electrostriction.

Methodology Applied

Scientific EffectElectrostriction: Electrostriction

Data Source

PatentUS8947850B2Multilayer capacitor

Publication Date: 2015.02.03 TDK CORP

AI summary

A multilayer capacitor that can suppress electrostrictive vibration without material constraint and with applicability to various structures, including general-purpose structures. A multilayer capacitor has: an element body formed of dielectric ceramic; and a plurality of internal electrodes disposed inside the element body such that the internal electrodes are stacked with ceramic layers sandwiched therebetween. The multilayer capacitor is provided with a capacitor area which includes the plurality of internal electrodes and a first suppression area and a second suppression area for reducing electrostriction caused by the plurality of internal electrodes so as to suppress noise. The first suppression area is adjacent to the capacitor area and the thickness of the second suppression area is determined according to the arrangement of the plurality of internal electrodes.