Piezoelectric Vibration Device Flexible Board Suspension

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Solution Overview

Problem

Conventional piezoelectric vibration devices experience degradation in characteristics due to displacement of the piezoelectric vibrator or fluctuations in the pressing force applied by lead terminals, leading to impaired mechanical vibration and efficiency issues, particularly in piezoelectric transformers.

Innovation Solution

A piezoelectric vibration device design that includes a piezoelectric vibrator, a flexible board, and a case with a securing portion and a ceiling portion, where the piezoelectric vibrator is suspended inside the case using a holding member, and the outer electrode is connected to the element-mounting terminal of the flexible board, minimizing impediment to mechanical vibration and maintaining stable characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If lead terminals are used to press the piezoelectric vibrator for electrical connection, then electrical connection is achieved, but mechanical vibration is impeded and characteristics degrade due to pressing force fluctuations

Engineering Contradiction:

Improvecharacteristic stabilityVSAvoidmechanical vibration impediment

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces a flexible board as an intermediary component between the piezoelectric vibrator and the external circuit. This flexible board provides electrical connection through its conductive patterns while its flexible nature allows it to accommodate vibration without impeding mechanical motion, thus resolving the contradiction between electrical connection and vibration freedom

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the rigid mechanical lead terminal pressing system with a flexible board system that uses elastic deformation and geometric design to achieve electrical connection. The flexible board's conductive patterns are connected to electrodes through controlled elastic deformation rather than continuous mechanical pressing, eliminating vibration impediment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Stability of the object's composition

If the piezoelectric vibrator is rigidly mounted for stable positioning, then mounting position stability is improved, but mechanical vibration is impeded

Engineering Contradiction:

Improvemounting position stabilityVSAvoidmechanical vibration impediment

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The patent employs a flexible board with specific geometric patterns that act as a flexible mounting structure. This flexible board maintains electrical connection while its flexibility allows the piezoelectric vibrator to move freely during vibration, resolving the contradiction between mounting stability and vibration freedom

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent creates a dynamic mounting system where the flexible board can elastically deform to accommodate the vibration motion of the piezoelectric vibrator. The mounting structure transitions from a static rigid connection to a dynamic flexible connection that adapts to vibration requirements

Inventive Principle:

Principle #15Dynamics

3Device complexity

If a simple mounting structure is used, then device complexity is reduced, but mounting precision and characteristic stability deteriorate

Engineering Contradiction:

Improvemounting structure complexityVSAvoidmounting position precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The flexible board serves multiple functions simultaneously: it provides electrical connection through conductive patterns, acts as a mounting structure for the piezoelectric vibrator, and accommodates vibration through elastic deformation. This multi-functionality reduces the need for separate complex mounting components while maintaining precision

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 configuration minimizes variations in characteristics and impediment to mechanical vibration, ensuring stable performance and high power conversion efficiency in piezoelectric transformers by securely mounting the piezoelectric vibrator and maintaining insulation between electrodes.

Implementation Method 1

the piezoelectric vibrator has a piezoelectric element, and an outer electrode provided on a surface of the piezoelectric element

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS11094874B2Piezoelectric vibration device

Publication Date: 2021.08.17 MURATA MFG CO LTD

AI summary

A piezoelectric vibration device is provided that includes a piezoelectric transformer, a flexible board and a case. The flexible board includes an element-mounting terminal connected to an outer electrode of the piezoelectric transformer, and an external connection terminal connected to a wiring board. The case has a securing member that secures the case to the wiring board and a ceiling. When the piezoelectric vibration device is mounted on the wiring board, the securing member defines a space between the ceiling and the wiring board to accommodate the piezoelectric transformer and the flexible board. Moreover, the piezoelectric transformer is suspended to the ceiling of the case by a holding member. This configuration provides a piezoelectric vibration device with which degradation of characteristics due to causes such as displacement of the piezoelectric vibrator or fluctuations in the pressing force applied by lead terminals is minimized.