Piezoelectric Actuator Reinforcing Plate Bend Vibration

Solution Overview

Problem

Piezoelectric actuators face the challenge of flexible substrate separation due to vibration, leading to potential disconnection from the piezoelectric element during long-term operation.

Innovation Solution

A piezoelectric actuator design incorporating a reinforcing plate with a bend portion attached to the flexible substrate, which absorbs vibration energy and reduces the likelihood of separation by attenuating vibrations, thereby enhancing the substrate's resistance to separation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a flexible substrate is electrically joined to the piezoelectric element, then electrical connection is achieved, but the flexible substrate separates from the piezoelectric element under vibration during long-term operation

Engineering Contradiction:

Improveconnection stabilityVSAvoidsubstrate attachment stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The reinforcing plate is divided into a first region and a second region, with the bend portion located at the boundary between these regions. This segmentation allows the plate to provide reinforcement while accommodating vibration-induced movements without compromising the electrical connection between the flexible substrate and piezoelectric element.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bend portion in the reinforcing plate is designed to absorb and attenuate vibration energy before it can cause separation between the flexible substrate and piezoelectric element. This preemptive cushioning effect prevents the harmful separation that would otherwise occur during long-term vibration operation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If the flexible substrate is made flexible for electrical connection, then electrical conductivity is achieved, but vibration causes separation between the substrate and piezoelectric element

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidvibration-induced separation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The reinforcing plate acts as an intermediary component between the flexible substrate and the piezoelectric element. It provides mechanical reinforcement to the flexible substrate in the region where it overlaps with the piezoelectric element, preventing vibration-induced separation while maintaining the electrical connection functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The bend portion in the reinforcing plate is designed to absorb and attenuate vibration energy before it can cause separation between the flexible substrate and piezoelectric element. This preemptive cushioning effect prevents the harmful separation that would otherwise occur during long-term vibration operation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Duration of action of moving object

If long-term driving operation is performed, then operational duration is extended, but separation of the flexible substrate occurs under vibration influence

Engineering Contradiction:

Improveoperational durationVSAvoidconnection stability

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The bend portion in the reinforcing plate is designed to absorb and attenuate vibration energy before it can cause separation between the flexible substrate and piezoelectric element. This preemptive cushioning effect prevents the harmful separation that would otherwise occur during long-term vibration operation, enabling extended operational duration while maintaining connection stability.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The reinforcing plate is divided into a first region and a second region, with the bend portion located at the boundary between these regions. This segmentation allows the plate to provide reinforcement while accommodating vibration-induced movements without compromising the electrical connection between the flexible substrate and piezoelectric element.

Inventive Principle:

Principle #1Segmentation

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 flexible substrate separation even after long-term driving operations, ensuring stable operation and noise reduction by effectively absorbing and attenuating vibrations.

Implementation Method 1

a piezoelectric element which comprises a stacked body in which internal electrodes 12 and piezoelectric layers 13 are laminated

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

a reinforcing plate 3 fixedly attached to a region of the flexible substrate 2 where the flexible substrate 2 overlaps with the piezoelectric element 10, the reinforcing plate 3 being provided with a bend portion 31

Methodology Applied

Scientific EffectVibration absorption and attenuation: Damping

Data Source

PatentUS9899591B2Piezoelectric actuator, piezoelectric vibration apparatus, and portable terminal

Publication Date: 2018.02.20 KYOCERA CORP

AI summary

There are provided a piezoelectric actuator having reduced noise caused by the vibration of a piezoelectric element is reduced, a piezoelectric vibration apparatus and a portable terminal. A piezoelectric actuator includes a piezoelectric element which includes a stacked body in which internal electrodes and piezoelectric layers are laminated, and a surface electrode disposed on one main surface of the stacked body so as to be electrically connected to the internal electrodes; and a flexible substrate electrically joined to the surface electrode; and a reinforcing plate fixedly attached to a region of the flexible substrate where the flexible substrate overlaps with the piezoelectric element, the reinforcing plate being provided with a bend portion.