Piezoelectric Driving Mechanism for Precise Miniaturized Motion
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Solution Overview
Problem
Conventional motors, such as stepper motors and voice coil motors, fail to meet the requirements of high displacement accuracy and miniaturization in electronic devices.
Innovation Solution
A driving mechanism utilizing a piezoelectric element and a flexible structure to drive a movable member, which includes a driving body with a movable portion and a contact member, allowing for precise movement along an arc trajectory without traditional coils or magnets, thereby enhancing displacement accuracy and enabling miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional motors (stepper motors and voice coil motors) are used to drive lenses and components, then the driving mechanism can provide sufficient driving force, but the displacement accuracy cannot meet certain specific requirements and the volume is larger
Solution Approach 1:
The patent replaces the conventional motor system (which relies on electromagnetic fields, coils, and magnets) with a piezoelectric-driven mechanical system. The piezoelectric element converts electrical signals directly into mechanical displacement through the piezoelectric effect, eliminating the need for coils and magnets. This substitution enables higher displacement accuracy through precise control of piezoelectric actuation while significantly reducing the overall volume of the driving mechanism.
Solution Approach 2:
The patent employs a flexible driving body with a flexible portion that can deform elastically to transmit motion. This flexible structure allows for compact design and miniaturization while maintaining the necessary mechanical compliance and motion transmission capabilities, thereby reducing the volume of the driving mechanism without compromising displacement accuracy.
2Manufacturing precision
If conventional motors are used, then the driving mechanism can achieve adequate displacement, but the displacement accuracy and miniaturization requirements cannot be simultaneously met
Solution Approach 1:
The patent replaces the complex electromagnetic system of conventional motors with a simpler piezoelectric actuation system. The piezoelectric element, flexible driving body, and contact member form a streamlined mechanical structure that eliminates coils, magnets, and associated electromagnetic components, thereby reducing structural complexity while achieving superior displacement accuracy through direct piezoelectric control.
Solution Approach 2:
The driving body is divided into distinct functional segments: a fixed portion, a flexible portion, and a movable portion. This segmentation allows each component to be optimized for its specific function while simplifying the overall structure. The flexible portion acts as a compliant connector between the fixed and movable portions, enabling precise motion transmission with reduced structural complexity.
3Measurement precision
If piezoelectric element and flexible structure are used, then displacement accuracy is improved and volume is reduced, but the ability to move larger and heavier objects requires greater driving force
Solution Approach 1:
The patent employs an arc-shaped trajectory for the contact member, where the contact member moves along a curved path rather than a straight line. This arc-shaped design allows the contact member to maintain continuous contact with the movable member while distributing the driving force more effectively. The curved trajectory enables the system to generate greater effective driving force for moving larger and heavier objects while maintaining high displacement accuracy through the piezoelectric actuation.
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 driving mechanism achieves improved displacement accuracy and reduces overall volume by eliminating the need for coils and magnets, while providing a greater driving force to move larger and heavier objects.
Implementation Method 1
the driving portion is the piezoelectric element
Implementation Method 2
The elastic member is configured to apply a stabilizing force onto the driving assembly
Implementation Method 3
The first flexible portion has a first flexible portion surface which is perpendicular to a second axis... the movement trajectory of the contact portion is an arc trajectory
Data Source
AI summary
A driving mechanism is provided. The driving mechanism includes a fixed assembly, a movable member, and a driving assembly. The movable member is movable relative to the fixed assembly. The driving assembly is configured to drive the movable member to move relative to the fixed assembly. The driving assembly includes a driving body and a driving portion. The driving portion receives external control signals and then deforms to push the driving body to deform, thereby driving a contact member located on the movable portion to move in a first dimension or a second dimension.