Piezoelectric Drive Device Electrode Separation for Noise Reduction
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Solution Overview
Problem
Existing piezoelectric drive devices suffer from reduced accuracy in detecting vibration amplitude and phase due to noise interference from common electrodes, which affects the precision of the potential difference waveform.
Innovation Solution
The piezoelectric drive device features a design where the drive electrodes and detection electrodes are separated on opposite surfaces of the piezoelectric material, with individual electrodes for driving and detection, reducing noise interference and enhancing signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common foundation electrode is used for both drive and detection, then device complexity is reduced, but measurement precision deteriorates due to noise interference
Solution Approach 1:
The patent divides the electrode system into separate drive electrodes (first and second electrodes) and detection electrodes (third and fourth electrodes). This segmentation eliminates the common foundation electrode configuration, preventing noise from the drive current from interfering with the detection signal, thereby resolving the contradiction between device simplicity and measurement precision.
2Measurement precision
If drive and detection electrodes are separated, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent combines multiple electrode functions into an integrated piezoelectric element structure. The first and second electrodes are arranged on opposite surfaces of the piezoelectric element, as are the third and fourth electrodes. This merging approach achieves separate drive and detection pathways while maintaining a compact, unified device structure, thus improving measurement precision without excessive complexity increase.
3Device complexity
If noise is superimposed on detection waveform, then signal accuracy decreases, but this configuration simplifies electrode arrangement
Solution Approach 1:
The patent extracts the detection electrodes (third and fourth electrodes) from the common foundation electrode configuration and positions them separately on the piezoelectric element. This extraction removes the noise source from the detection pathway, eliminating the superimposition of drive current noise on the detection waveform, thereby improving signal accuracy while maintaining manageable electrode arrangement.
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 configuration improves the accuracy of detection signals, allowing for more precise control and stability in the operation of the piezoelectric drive device, enabling better performance in applications such as robotics and printing.
Implementation Method 1
a piezoelectric material having a first surface and a second surface in a front-back relation, a drive electrode having a first electrode arranged at the first surface and a second electrode arranged at the second surface, and vibrating the piezoelectric material when a drive signal from the control unit is input to the second electrode
Implementation Method 2
a detection electrode having a third electrode arranged at the first surface and a fourth electrode arranged at the second surface, and outputting a detection signal according to the vibration of the piezoelectric material to the control unit via the fourth electrode
Data Source
AI summary
A piezoelectric drive device includes a vibrating part, and a control unit that controls vibration of the vibrating part, wherein the vibrating part includes a piezoelectric material having a first surface and a second surface in a front-back relation, a drive electrode having a first electrode arranged at the first surface and a second electrode arranged at the second surface, and vibrating the piezoelectric material when a drive signal from the control unit is input to the second electrode, and a detection electrode having a third electrode arranged at the first surface and a fourth electrode arranged at the second surface, and outputting a detection signal according to the vibration of the piezoelectric material to the control unit via the fourth electrode, and the first electrode and the third electrode are separated on the first surface, and the second electrode and the fourth electrode are separated on the second surface.