Piezoelectric Drive Device Multi-Module Vibration Control
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Solution Overview
Problem
Existing piezoelectric drive devices are complex and large due to the need for multiple shafts to control angular velocity, making them unsuitable for miniaturization and simplification in applications like robots, electronic component transport, printers, and projectors.
Innovation Solution
A piezoelectric drive device with multiple vibration modules that perform longitudinal and bending vibrations, allowing for switching between different drive modes to control the moving speed of a driven portion, simplifying the device configuration and enabling miniaturization by all modules abutting on a single driven portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple shafts are provided to control angular velocity, then the angular velocity control capability is improved, but the device complexity and size increase
Solution Approach 1:
The patent merges multiple shaft functions into a single driven portion. Multiple piezoelectric vibration modules (first, second, third modules) all abut on the same driven portion, eliminating the need for separate shafts while maintaining the capability to control angular velocity through coordinated vibration of the modules
Solution Approach 2:
The single driven portion serves multiple functions that previously required separate shafts. By controlling the vibration patterns of different piezoelectric modules, the same driven portion can achieve various angular velocities and rotation directions, making it a universal control element
2Adaptability or versatility
If multiple shafts are provided to control angular velocity, then the angular velocity control capability is improved, but the apparatus size increases
Solution Approach 1:
The patent combines multiple shaft functions into one compact driven portion. All piezoelectric vibration modules concentrate their action on this single element, significantly reducing the spatial footprint compared to having separate shafts for each control function
Solution Approach 2:
The patent transitions from a multi-shaft spatial arrangement to a multi-modal vibration approach. Instead of adding elements in space (more shafts), the solution adds complexity in the vibration domain (different vibration modes and frequencies), achieving the same control capability in a more compact form
3Device complexity
If all piezoelectric vibration modules abut on one driven portion, then the device configuration is simplified and miniaturization is achieved, but the control precision may be affected
Solution Approach 1:
The patent segments the control function across multiple independent piezoelectric vibration modules. Each module can be controlled independently with specific vibration frequencies and amplitudes, allowing precise control of the driven portion's rotation while maintaining a simplified single-point contact configuration
Solution Approach 2:
The patent uses parameter changes in the vibration modules to achieve precise control. By adjusting vibration frequency, amplitude, and phase of individual modules, the system can precisely control the angular velocity and direction of the driven portion without compromising control precision despite the simplified configuration
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 solution allows for high operability, ease of use, and reliability in devices by simplifying the configuration and enabling miniaturization, while maintaining control over the moving speed and torque of the driven portion through mode switching.
Implementation Method 1
a vibration portion 31 and a transmission portion 34 which abuts on a driven portion 2 and transmits longitudinal vibration in an alignment direction in which the vibration portion 31 is aligned with the driven portion 2 and bending vibration which is a composite vibration of the longitudinal vibration and lateral vibration
Data Source
AI summary
A piezoelectric drive device includes piezoelectric vibration modules that each include a vibration portion and a transmission unit abutting a driven portion and transmitting longitudinal vibration in an alignment direction of the vibration portion with the driven portion and bending vibration which is a composite of the longitudinal vibration and lateral vibration of the vibration portion intersecting the alignment direction to the driven portion and a controller controlling the modules. The controller controls the modules in a first drive mode wherein the transmission portions of all the modules are driven to perform the bending vibration in a first direction and a second drive mode wherein the transmission portions of some of the modules are driven to perform the bending vibration in the first direction and the transmission portions of other modules are driven to perform the longitudinal or bending vibrations in a second direction opposite the first direction.