Piezoelectric Actuator Common Electrode Segmentation
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Solution Overview
Problem
Piezoelectric actuators face challenges in maintaining uniform electric potential across common electrodes, leading to nonuniform driving characteristics and potential fluctuations, which can affect the reliability and performance of liquid discharge applications.
Innovation Solution
The design incorporates two types of common electrodes with wiring lines connected at multiple separated positions to ensure uniform electric potentials, using a configuration where one connecting wiring straddles the second common electrode, thereby maintaining consistent electric potential across all portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common electrode is used for multiple pressure chambers, then the device complexity is reduced, but the electric potential uniformity deteriorates leading to nonuniform driving characteristics
Solution Approach 1:
The common electrode is divided into multiple separate common electrodes, each corresponding to different pressure chambers. This segmentation allows independent electric potential control for each common electrode, ensuring uniform electric potential distribution across all pressure chambers while maintaining manageable device complexity through modular electrode configuration.
2Manufacturing precision
If wiring lines are connected at multiple separated positions, then the electric potential uniformity is improved, but the device complexity increases
Solution Approach 1:
The wiring configuration is segmented into multiple wiring lines, with each wiring line connected to a specific common electrode at separated positions. This segmentation enables precise electric potential control for each common electrode while distributing the wiring complexity across multiple simple connections rather than one complex connection.
Solution Approach 2:
The wiring lines are arranged in different spatial dimensions and positions on the vibration plate, connecting to different common electrodes at separated locations. This dimensional arrangement allows multiple connection points without creating complex interconnections, as each wiring line operates independently in its own spatial pathway.
3Device complexity
If the common electrode is arranged on the same surface as individual electrodes, then the device structure is simplified, but the electric potential distribution becomes nonuniform
Solution Approach 1:
Multiple common electrodes are arranged on the same surface as individual electrodes, but each common electrode is spatially separated and corresponds to specific pressure chambers. This segmentation maintains structural simplicity while enabling uniform electric potential distribution through independent electrode control.
Solution Approach 2:
Each common electrode is positioned to face specific pressure chambers, creating local quality differences in the electrode arrangement. This localized positioning ensures that electric potential is uniformly distributed to each pressure chamber while maintaining overall structural simplicity on the same surface.
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 uniformizes the electric potentials of the common electrodes, enhancing the reliability and consistency of the piezoelectric actuator's performance by preventing potential fluctuations and ensuring uniform driving characteristics across all pressure chambers.
Implementation Method 1
a piezoelectric layer which is stacked on the vibration plate... individual electrodes which are arranged on one surface of the piezoelectric layer... common electrodes which are arranged on the other surface of the piezoelectric layer... when a voltage is applied between the individual electrodes and the common electrodes, the piezoelectric layer is deformed
Data Source
AI summary
There is provided a head including: a piezoelectric layer; a plurality of individual electrodes located below the piezoelectric layer in an up-down direction; a common electrode located below the piezoelectric layer. The plurality of individual electrodes includes: a first individual electrode array including a plurality of first individual electrodes aligned in a first direction; and a second individual electrode array including a plurality of second individual electrodes aligned in the first direction. The common electrode includes: a plurality of first facing portions which are demarcated to correspond to the plurality of first electrodes, respectively; a plurality of second facing portions which are demarcated to correspond to the plurality of second electrodes, respectively; and a connecting portion located between the plurality of first facing portions and the plurality of second facing portions, and connecting the plurality of first facing portions and the plurality of second facing portions.