Flexible Printed Board Vibration Control in Ultrasonic Motors

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Solution Overview

Problem

In vibration-type driving apparatuses, such as linear ultrasonic motors, the bonding of flexible printed boards to piezoelectric elements can suppress bending vibrations, leading to decreased efficiency and variations in vibration characteristics, particularly due to the adhesive's rigidity and weight.

Innovation Solution

A flexible printed board is connected to the piezoelectric element with a bonded region at an antinode and an adjacent non-bonded region at a node of vibration, with a gap between the non-bonded region and the vibrating body, minimizing interference with the bending vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the flexible printed board is bonded to the piezoelectric element with adhesive, then the electrical connection is ensured, but the bending vibration is obstructed and efficiency decreases

Engineering Contradiction:

Improveelectrical connectionVSAvoidvibration efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The flexible printed board is divided into a bonded portion (for electrical connection) and a non-bonded portion (to avoid vibration obstruction). This segmentation allows the board to fulfill both electrical connectivity and vibration efficiency requirements simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the flexible printed board have different bonding characteristics: the bonded portion has adhesive for electrical connection, while the non-bonded portion has no adhesive to minimize vibration interference. This local differentiation resolves the contradiction between connection reliability and vibration efficiency.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the amount of adhesive is increased to increase rigidity and weight of the flexible printed board, then the structural stability is improved, but variations in vibration characteristics increase

Engineering Contradiction:

Improvestructural stabilityVSAvoidvibration characteristics consistency

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The flexible printed board is segmented into bonded and non-bonded portions, controlling adhesive distribution to maintain structural stability only where needed while preserving consistent vibration characteristics in the non-bonded region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Adhesive is applied locally only in the bonded portion for structural stability, while the non-bonded portion remains adhesive-free to ensure consistent vibration characteristics across different units.

Inventive Principle:

Principle #3Local quality

3Reliability

If the flexible printed board is bonded across the entire piezoelectric element, then the electrical connection is enhanced, but the vibration displacement at the boundary causes obstruction to bending vibration

Engineering Contradiction:

Improveelectrical connectionVSAvoidvibration efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The flexible printed board is segmented into a bonded portion for electrical connection and a non-bonded portion to avoid vibration obstruction, optimizing both electrical and mechanical performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The adhesive bonding is extracted from the entire piezoelectric element surface and retained only in the bonded portion, removing the harmful effect of full-surface bonding on vibration while preserving electrical connection functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

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

This configuration reduces variations in vibration characteristics and maintains efficiency by minimizing the suppression of the vibrating body's motion, allowing for effective energy transfer and reduced mechanical interference.

Implementation Method 1

The vibrating body 501 is constituted by a piezoelectric element 505 serving as an electro-mechanical energy conversion element

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

vibrations in a plurality of desired vibration modes are excited by applying a voltage with a particular frequency to a piezoelectric element

Methodology Applied

Scientific EffectUltrasonic vibration: Ultrasonic Vibration

Data Source

PatentUS9065036B2Vibration-type driving apparatus and image pickup apparatus

Publication Date: 2015.06.23 CANON KK

AI summary

Provided is a vibration-type driving apparatus comprising a vibrating body including an electro-mechanical energy conversion element and an elastic body to which the electro-mechanical energy conversion element is joined; and a flexible printed board connected to the electro-mechanical energy conversion element, wherein the flexible printed board includes a first region bonded to at least the location of an antinode portion of vibration of the vibrating body and a second region that is adjacent to the first region and that is not bonded to the electro-mechanical energy conversion element; the boundary portion between the first region and the second region is located at a node portion of the vibration of the vibrating body; and a gap is present between the second region and the vibrating body.