Piezoelectric Multi-Layer Component Parasitic Oscillation Suppression

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Solution Overview

Problem

Piezoelectric components operating with thickness oscillations face efficiency issues due to the excitation of parasitic oscillation modes, particularly horizontal oscillations, which are not effectively suppressed by existing technologies, leading to complex and cost-intensive production methods.

Innovation Solution

A piezoelectric multi-layer component is designed using a main body with specific polarization configurations in the input and output regions, featuring layers and partial layers polarized antiparallel and parallel to each other, effectively damping parasitic oscillation modes through mechanical and electrical coupling, allowing production via proven multi-layer technology.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a ring-shaped piezoelectric main body is used to suppress parasitic oscillation modes, then parasitic oscillation suppression is improved, but device complexity and manufacturing cost increase due to incompatible production technologies

Engineering Contradiction:

Improveparasitic oscillation suppressionVSAvoidproduction complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The piezoelectric main body is segmented into multiple plies with alternating polarization directions. This segmentation allows the use of standard multi-layer production technology while achieving parasitic oscillation suppression through the specific polarization configuration of the segmented structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the piezoelectric main body have different polarization configurations. The input region and output region have plies polarized in opposite directions, creating local quality variations that suppress parasitic oscillations while maintaining compatibility with multi-layer production technology.

Inventive Principle:

Principle #3Local quality

2Loss of energy

If a ring-shaped piezoelectric main body is used to suppress parasitic oscillation modes, then parasitic oscillation suppression is improved, but manufacturing cost increases due to complex production technologies

Engineering Contradiction:

Improveparasitic oscillation suppressionVSAvoidmanufacturing cost

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The piezoelectric main body is divided into multiple plies that can be manufactured using standard multi-layer technology. This segmentation enables cost-effective production while achieving parasitic oscillation suppression through the alternating polarization configuration of the segmented plies.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses universal multi-layer production technology that is already established in the industry. By making the piezoelectric main body compatible with this standard technology through proper segmentation and polarization, manufacturing costs are reduced while still achieving parasitic oscillation suppression.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If multi-layer technology is used for production, then ease of manufacture is improved, but parasitic oscillation suppression is worsened without specific polarization configurations

Engineering Contradiction:

Improveproduction easeVSAvoidparasitic oscillation suppression

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The plies in the input region and output region are polarized in opposite directions, creating local quality differences. This specific polarization configuration, combined with multi-layer technology, achieves both ease of manufacture and effective parasitic oscillation suppression.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The piezoelectric main body is constructed as a composite of multiple plies with alternating polarization directions. This composite structure maintains compatibility with multi-layer production technology while achieving parasitic oscillation suppression through the specific arrangement and polarization of the constituent plies.

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 solution effectively suppresses parasitic oscillation modes, increasing the efficiency of the piezoelectric component while enabling cost-effective production using existing multi-layer technology, suitable for radio-frequency applications.

Implementation Method 1

The conversion of the electrical energy into the mechanical energy is effected on the basis of the inverse piezoelectric effect

Methodology Applied

Scientific EffectInverse piezoelectric effect: Piezoelectric Effect

Implementation Method 2

In the output region, the mechanical thickness oscillations are preferably converted back into an electrical signal on the basis of the direct piezoelectric effect

Methodology Applied

Scientific EffectDirect piezoelectric effect: Converse Piezoelectric Effect

Implementation Method 3

The excitation of parasitic oscillation nodes is effectively damped by virtue of the specific type of polarization of the plies

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS9842983B2Piezoelectric multi-layer component

Publication Date: 2017.12.12 TDK ELECTRONICS AG

AI summary

A piezoelectric multi-layer component includes a piezoelectric main body, which has an inlet area and an outlet area. In the outlet area or in the inlet area at least two adjacent layers are polarized antiparallel to each other and at least two adjacent layers are polarized parallel to each other.