Piezoelectric Driving Mechanism for Precise Miniature Lens Motion
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Solution Overview
Problem
Conventional motors, such as stepper motors and voice coil motors, fail to meet the requirements for displacement accuracy and miniaturization in electronic devices like smartphones and digital cameras.
Innovation Solution
A driving mechanism utilizing a piezoelectric element with a flexible portion and a contact member, allowing for precise movement along an arc trajectory without traditional coils or magnets, enabling miniaturization and increased driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional motors (stepper motors and voice coil motors) are used to drive lenses or other objects, then the driving mechanism can achieve basic movement functionality, but the displacement accuracy cannot meet certain specific requirements
Solution Approach 1:
The patent replaces the conventional motor system (electromagnetic field-based) 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, magnets, and complex electromagnetic control mechanisms. This substitution achieves higher displacement accuracy while reducing overall device complexity.
Solution Approach 2:
The patent utilizes the piezoelectric effect to change the physical state of the piezoelectric element in response to electrical signals. By applying different voltages, the piezoelectric element expands or contracts with precise control over its dimensional changes, enabling high-precision displacement control that conventional motors cannot achieve.
2Volume of moving object
If conventional motors are used in electronic devices, then the driving function is achieved, but miniaturization cannot be accomplished
Solution Approach 1:
The piezoelectric-driven flexible portion replaces the bulky motor structure with a compact mechanical actuation system. The flexible portion's elastic deformation mechanism allows for miniaturization while maintaining precise displacement control, as it eliminates the need for large electromagnetic components like coils and magnets.
Solution Approach 2:
The patent employs a flexible portion made of elastic material that can deform under piezoelectric actuation. This flexible structure enables compact design and miniaturization while providing controlled displacement through elastic deformation, achieving both small volume and high precision.
3Ease of operation
If the first flexible portion and the driving portion are arranged along the third axis, then the contact member can move along an arc trajectory to drive the movable portion, but the structural complexity increases with multiple connecting portions and surfaces
Solution Approach 1:
The patent introduces an arc-shaped trajectory for the contact member's movement, where the contact member moves along a curved path rather than a straight line. This arc trajectory is achieved through the coordinated deformation of the flexible portion and driving portion, enabling precise angular control and improved ease of operation for rotational or angular positioning applications.
Solution Approach 2:
The patent employs dynamic deformation of the flexible portion and driving portion to achieve the arc trajectory. The elastic material dynamically changes its shape in response to piezoelectric actuation, allowing the contact member to follow a curved path. This dynamic approach converts linear piezoelectric displacement into rotational or angular motion, improving operational precision.
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, capable of driving larger and heavier objects with enhanced precision and efficiency.
Implementation Method 1
driving portion (116) configured to drive the movable portion (1041) to move
Implementation Method 2
The movable portion (1041) is movable relative to the fixed portion (1042) via the first flexible portion (1043)
Data Source
AI summary
A driving mechanism is provided. The driving mechanism includes a fixed portion, a movable portion, and a driving portion. The movable portion is movable relative to the fixed portion. The driving portion is configured to drive the movable portion to move relative to the fixed portion. The movable portion and the driving portion are arranged along a first axis.