Piezoelectric Driving Mechanism for Precise Miniaturized Displacement

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Solution Overview

Problem

Conventional motors, such as stepper motors and voice coil motors, fail to meet specific requirements for displacement accuracy and miniaturization in modern electronic devices.

Innovation Solution

A driving mechanism incorporating a fixed assembly, a movable part, and a driving module with a piezoelectric assembly, where two piezoelectric elements can be independently deformed to drive an elastic member, which in turn moves the driving member relative to the fixed assembly, allowing for precise movement along various axes without the need for conventional coils or magnets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional motors (stepper motors or voice coil motors) are used to drive lenses or other objects, then the device can achieve basic driving function, but the displacement accuracy does not meet certain specific requirements

Engineering Contradiction:

Improvedisplacement accuracyVSAvoidstructure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces conventional motor systems (electromagnetic driving) with a piezoelectric-driven mechanical system. The piezoelectric element converts electrical signals directly into mechanical displacement, eliminating the need for coils, magnets, and complex motor structures. This substitution achieves higher displacement accuracy through direct coupling between the piezoelectric element and the driven component, while simultaneously reducing overall device complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent utilizes the piezoelectric effect where electrical parameters (voltage applied to piezoelectric element) are directly converted into mechanical displacement parameters. By controlling the electrical signals to the piezoelectric element, precise displacement control is achieved without the intermediate conversion steps required in conventional motors, thereby improving displacement accuracy.

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If conventional motors are used to achieve required driving function, then basic operation is possible, but miniaturization cannot be achieved

Engineering Contradiction:

Improvedevice sizeVSAvoiddisplacement accuracy

Core Design Contradiction:

Volume of moving objectVSMeasurement precision

Solution Approach 1:

The patent replaces bulky conventional motor assemblies with compact piezoelectric elements. The piezoelectric element's direct conversion of electrical energy to mechanical motion eliminates the need for large coils, magnets, and associated mechanical components, enabling significant miniaturization while maintaining or improving displacement accuracy through direct actuation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent integrates the piezoelectric element directly with the driving mechanism, merging the actuator and the driven component into a compact unified structure. This integration eliminates the need for separate motor housings, mounting brackets, and transmission mechanisms, achieving miniaturization while ensuring precise force and displacement transmission.

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If additional components are added to improve driving precision, then displacement accuracy can be enhanced, but the device size increases

Engineering Contradiction:

Improvedisplacement accuracyVSAvoiddevice size

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent eliminates the need for additional precision components (such as gear trains, belts, or complex feedback mechanisms) by using the piezoelectric element's inherent precision. The direct coupling between the piezoelectric element and the driven load ensures accurate displacement transmission without requiring extra size-increasing components for precision enhancement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The piezoelectric element inherently provides precise displacement control through its material properties, eliminating the need for additional precision-enhancing components. The system uses the piezoelectric effect's natural characteristics (high resolution, direct coupling) to achieve precision without adding external components that would increase device size.

Inventive Principle:

Principle #25Self-service

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 design enhances displacement accuracy and achieves miniaturization by eliminating the need for additional components, allowing for compact and precise movement in applications like 3D printers and electron microscopes.

Implementation Method 1

a piezoelectric assembly including two piezoelectric elements, the two piezoelectric elements being disposed in the first elastic member and configured to receive a control signal to generate deformation

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS20240255725A1Driving mechanism and driving module

Publication Date: 2024.08.01 ACTUTEK CORP

AI summary

A driving mechanism is provided. The driving mechanism includes a fixed assembly, a movable part, and a driving module. The movable part is movable relative to the fixed assembly. The driving module is configured to drive the movable part to move relative to the fixed assembly. When viewed along the first axis, the driving module is disposed between the fixed assembly and the movable part.