Piezoelectric Drive Unit Layout to Suppress Interference
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Solution Overview
Problem
Conventional piezoelectric elements experience interference in driving between drive units, leading to variations in operation characteristics.
Innovation Solution
The piezoelectric element is configured with drive units arranged in a staggered manner, alternately disposed in the third direction, and separated by recesses, with dummy electrodes in non-drive regions to maintain uniform thickness and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple drive units are disposed close to each other in the element body, then the device can achieve compact structure and high density, but interference in driving between drive units occurs causing variations in operation characteristics
Solution Approach 1:
The element body is divided into multiple drive regions, with each drive region containing drive units of the same polarity. This segmentation isolates the drive units into distinct functional zones, reducing electromagnetic interference between adjacent drive units while maintaining compact overall structure.
Solution Approach 2:
Different regions of the element body are assigned different drive unit polarities (first drive units with first polarity, second drive units with second polarity). This local differentiation creates alternating polarity patterns that reduce interference effects while allowing dense packing of drive units throughout the element body volume.
2Reliability
If drive units are arranged in alternating polarity pattern to reduce interference, then driving interference is suppressed, but the device complexity increases due to alternating arrangement requirements
Solution Approach 1:
The element body is divided into multiple drive regions, with each drive region containing drive units of the same polarity. This segmentation isolates the drive units into distinct functional zones, reducing electromagnetic interference between adjacent drive units while maintaining compact overall structure.
Solution Approach 2:
Multiple drive units of the same polarity are grouped together within each drive region and connected to common electrode terminals. This merging approach simplifies the electrical connection structure while maintaining the alternating polarity pattern between different drive regions, reducing overall device complexity.
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 effectively suppresses interference between drive units, stabilizes operation characteristics, and ensures uniform stress distribution, allowing for stable output without variations.
Implementation Method 1
a plurality of piezoelectric layers stacked in a first direction... forming a drive unit that causes strain deformation
Data Source
AI summary
An element body of a piezoelectric element contains a drive region in which a drive unit is disposed, the drive unit including a first internal electrode and a second internal electrode facing each other in a first direction with a piezoelectric layer interposed therebetween. The drive unit has a plurality of first drive units arranged in a third direction on one side in a second direction, and a plurality of second drive units arranged in the third direction on the other side in the second direction. In a case where the element body is viewed from the first direction, the first drive unit and the second drive unit are alternately disposed in the third direction.