Multilayer Ceramic Piezoelectric Actuator Electrode Structure
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Solution Overview
Problem
Existing piezoelectric actuators with multilayer ceramic bodies face issues with particle detachment during bending vibration, complicating handling and electrical inspection, and leading to insufficient measurement accuracy due to the lack of electrodes on the lower surface and complex handling requirements.
Innovation Solution
A multilayer ceramic structure with a rectangular-parallelepiped shape, featuring upper and lower surface opposing electrodes, inner opposing electrodes, and side surface electrodes, where the upper surface opposing electrode reaches the side surface and is electrically connected, and inner opposing electrodes are led out to the side surface electrodes, with a slit between the opposing portions to prevent particle detachment and facilitate easy poling and electrical inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multilayer ceramic body is subjected to bending vibration, then piezoelectric actuation is achieved, but particle detachment occurs
Solution Approach 1:
Electrodes are provided in advance on both the upper and lower surfaces of the multilayer ceramic body, creating a protective structure before particle detachment can occur. This prior cushioning through electrode coverage prevents particles from detaching during bending vibration while maintaining piezoelectric actuation functionality
2Device complexity
If electrodes are not provided on the lower surface of the multilayer ceramic body, then the structure is simpler, but particle detachment occurs and measurement accuracy is insufficient
Solution Approach 1:
The electrode structure is segmented into upper surface electrodes, lower surface electrodes, and inner electrodes, with each segment serving specific functions. This segmentation allows the lower surface electrodes to prevent particle detachment while maintaining overall structural organization and avoiding excessive complexity
3Ease of operation
If electrical connections are made using side surfaces of the piezoelectric actuator, then electrical connections are achieved, but handling becomes complicated and measurement accuracy is insufficient
Solution Approach 1:
The electrical connection approach is shifted from the side surface dimension to the upper and lower surface dimensions. By providing electrodes on the upper and lower surfaces that extend to or are connected with side surface electrodes, the patent enables electrical connections and measurements to be performed more accurately through surface contacts rather than side surface contacts, improving both ease of operation and measurement 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 solution effectively prevents particle detachment during operation and allows for accurate electrical characteristic inspection by ensuring the upper and lower surfaces are covered by electrodes, enhancing measurement accuracy and simplifying the handling process.
Implementation Method 1
a plurality of ceramic layers composed of a piezoelectric ceramic are stacked on top of one another... a ceramic layer and an inner electrode are alternately stacked... the active layer is driven and undergoes bending vibration
Data Source
AI summary
A multilayer ceramic structure, which is to be divided into a large number of piezoelectric actuators, includes a rectangular-parallelepiped-shaped multilayer ceramic body. An upper surface opposing electrode is formed on an upper surface, a lower surface opposing electrode is formed on a lower surface and inner opposing electrodes are formed inside the multilayer ceramic body. A silt is provided in the upper surface opposing electrode. Opposing portions are provided where the upper surface opposing electrode, the inner opposing electrodes and the lower surface opposing electrode are superposed with each other when viewed in plan. The slit is provided in the upper surface opposing electrode in a portion of a region between the opposing portion and the first side surface and so as to extend in a first direction linking a first end surface and a second end surface.