Piezoelectric Driving Device Multi-Directional Control
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Solution Overview
Problem
Existing piezoelectric driving devices can only drive objects in one direction by combining oscillation modes in the X-axis and Y-axis directions, limiting their directional capability.
Innovation Solution
A piezoelectric driving device with at least two piezoelectric portions arranged on a predetermined plane, sandwiching a driving portion, which is bent when voltages are applied, allowing for frictional contact and movement in one or two directions depending on the configuration of the piezoelectric elements and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two oscillation modes in X-axis and Y-axis directions are combined to drive the object, then the object can be driven in one axial direction, but the device can only drive in one direction and lacks multi-directional capability
Solution Approach 1:
The piezoelectric element is divided into multiple independent piezoelectric portions (first, second, third, and fourth portions) that can be independently controlled. Each portion can be driven to bend in response to applied voltage, enabling independent control of oscillation in different directions without requiring complex combined oscillation modes.
Solution Approach 2:
The patent transitions from controlling oscillation in two separate axial directions (X and Y axes) to controlling bending in multiple dimensions simultaneously. By arranging piezoelectric portions around the driving portion and applying voltages to induce bending, the system achieves multi-directional driving capability through dimensional expansion of the control approach.
2Measurement precision
If piezoelectric portions are arranged to bend when voltages are applied, then precise control over driving direction is achieved, but the structural complexity of the piezoelectric configuration increases
Solution Approach 1:
Different piezoelectric portions are positioned at specific locations around the driving portion (first and second portions on one side, third and fourth portions on the other side). By applying voltage to specific portions, bending is induced locally in the desired direction, enabling precise control of the driving direction without requiring complex overall structural changes.
Solution Approach 2:
The piezoelectric portions are designed to dynamically bend in response to applied voltages. This dynamic bending capability allows the driving direction to be precisely controlled by adjusting which portions receive voltage and the magnitude of the voltage, providing flexible and precise directional control without fixed mechanical constraints.
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
Enables precise control over the movement of objects in one or two directions, enhancing the directional versatility of piezoelectric driving devices.
Implementation Method 1
at least two piezoelectric portions, which are formed integrally with the driving portion, are arranged on a predetermined plane with the driving portion being sandwiched between the at least two piezoelectric portions, and are configured to be bent with respect to the predetermined plane when voltages are applied to the at least two piezoelectric portions
Implementation Method 2
a driving portion to be brought into frictional contact with an object to be driven, which is moved with respect to a fixed body
Data Source
AI summary
A piezoelectric driving device includes: a driving portion to be brought into frictional contact with an object to be driven, which is moved with respect to a fixed body; and at least two piezoelectric portions, which are formed integrally with the driving portion, are arranged on a predetermined plane with the driving portion being sandwiched between the at least two piezoelectric portions, and are configured to be bent with respect to the predetermined plane when voltages are applied to the at least two piezoelectric portions, wherein outer edges of entirety of the at least two piezoelectric portions are fixed to the fixed body.