Piezoelectric Layer Composition for High Displacement
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Solution Overview
Problem
Current piezoelectric elements in liquid ejecting heads and actuator devices do not achieve sufficient displacement, limiting their performance in applications such as ink jet recording heads and other apparatuses.
Innovation Solution
A piezoelectric element with a perovskite structure piezoelectric layer containing lead, zirconium, and titanium at both A and B sites, allowing for high displacement characteristics at low driving voltage, achieved by optimizing the composition and crystal structure of the piezoelectric layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional piezoelectric layers are used, then the device structure is simple and manufacturing is easier, but the displacement characteristic is insufficient
Solution Approach 1:
The invention changes the compositional parameters of the piezoelectric layer by incorporating lead, zirconium, and titanium at specific ratios (0.1≤x≤0.5, 0.4≤y≤0.7) to optimize the perovskite structure. This parameter optimization enables large displacement at low driving voltage while maintaining manufacturing feasibility through established thin-film deposition techniques
Solution Approach 2:
The invention uses a composite piezoelectric layer containing multiple elements (lead, zirconium, titanium) in a perovskite structure. This composite material approach combines the advantages of different elements: lead provides high piezoelectric coefficient, zirconium enhances stability, and titanium improves mechanical properties, achieving superior displacement characteristics
2Length of moving object
If higher driving voltage is applied to conventional piezoelectric elements, then displacement can be increased, but power consumption increases
Solution Approach 1:
By optimizing the compositional parameters (x and y ratios of zirconium and titanium) and crystal structure of the piezoelectric layer, the invention achieves high piezoelectric coefficients that produce large displacement at low driving voltage, directly reducing power consumption while maintaining or improving displacement performance
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 enables high displacement characteristics at low power consumption, enhancing the performance of liquid ejecting heads and actuator devices by increasing the in-plane lattice constants and allowing for larger displacement at lower voltages.
Implementation Method 1
a piezoelectric element which includes a first electrode, a piezoelectric layer, and a second electrode and which produces a pressure change in a pressure generating chamber communicating with a nozzle opening
Data Source
AI summary
A liquid ejecting head including a pressure-generating chamber which communicates with a nozzle opening, and a piezoelectric element including a first electrode, a piezoelectric layer formed above the first electrode and having a perovskite structure represented by the general formula ABO3, and a second electrode formed above the piezoelectric layer, wherein the piezoelectric layer, lead, zirconium, and titanium are present at A sites of the perovskite structure, and lead, zirconium, and titanium are present at B sites of the perovskite structure.