Vibrating Device Dual-Fixing Structure Reduces Vibration Loss

Solution Overview

Problem

Conventional vibrating devices using piezoelectric elements are inefficient in outputting vibrations with long wavelengths due to transmission losses between the piezoelectric element and the vibrating body.

Innovation Solution

A vibrating device design featuring a piezoelectric element and a vibrating body fixed with a dual-fixing structure, where the second fixing portions have a larger deformation tolerance than the first fixing portion, allowing for reduced vibration loss and enhanced vibration range, enabling the output of long-wavelength vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the entire surface of the vibrator is fixed to the vibrating body with high deformation tolerance, then the vibration transmission is stable, but the transmission loss of vibration increases and long-wavelength vibration output is suppressed

Engineering Contradiction:

Improvevibration transmission stabilityVSAvoidvibration transmission loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The fixing portion is divided into multiple fixing regions with different deformation tolerances rather than using a uniform fixing structure. This segmentation allows different parts of the vibrator to have different degrees of freedom, reducing overall vibration transmission loss while maintaining stability at critical locations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the fixing portion are assigned different deformation tolerance characteristics. The first fixing region has low deformation tolerance for stable center fixation, while the second fixing region has high deformation tolerance to reduce edge constraints and minimize vibration transmission loss.

Inventive Principle:

Principle #3Local quality

2Loss of energy

If the deformation tolerance of the fixing portion is increased to reduce vibration loss, then long-wavelength vibration output is improved, but the vibration transmission stability deteriorates

Engineering Contradiction:

Improvevibration transmission lossVSAvoidvibration transmission stability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The fixing portion is divided into multiple fixing regions with different deformation tolerances rather than using a uniform fixing structure. This segmentation allows different parts of the vibrator to have different degrees of freedom, reducing overall vibration transmission loss while maintaining stability at critical locations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the fixing portion are assigned different deformation tolerance characteristics. The first fixing region has low deformation tolerance for stable center fixation, while the second fixing region has high deformation tolerance to reduce edge constraints and minimize vibration transmission loss.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If the second fixing portions are separated from the first fixing portion, then short-wavelength vibration transmission is suppressed, but the device complexity increases

Engineering Contradiction:

Improvelow sound focus capabilityVSAvoidfixing portion structure

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The fixing portion is divided into multiple fixing regions with different deformation tolerances rather than using a uniform fixing structure. This segmentation allows different parts of the vibrator to have different degrees of freedom, reducing overall vibration transmission loss while maintaining stability at critical locations.

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 design effectively suppresses vibration loss and amplifies low-frequency sound output, allowing for improved transmission of long-wavelength vibrations while minimizing short-wavelength transmission, thereby enhancing the device's ability to produce low sound.

Implementation Method 1

a piezoelectric element having transparent electrodes on both surfaces

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS20250018428A1Vibrating device

Publication Date: 2025.01.16 TDK CORP

AI summary

A vibrating device includes a vibrator including a piezoelectric element, and a vibrating body fixed so as to overlap the vibrator via a fixing portion. The fixing portion has a first fixing portion located on a center side and second fixing portions located outside the first fixing portion in plan view of the vibrator and the vibrating body. Deformation tolerance of the vibrator and the vibrating body by the second fixing portions is larger than deformation tolerance of the vibrator and the vibrating body by the first fixing portion.