Piezoelectric Element Buffer Layer Orientation Control
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Solution Overview
Problem
Current piezoelectric elements used in inkjet printers and other devices lack high enough piezoelectric constants and stability, limiting their ability to achieve higher nozzle density and faster printing speeds.
Innovation Solution
A piezoelectric element with a buffer layer and barrier layer of Pb((Zr1-xTix)1-yNby)O3 and a relaxor material piezoelectric film, where x is between 0 and 1, and y is between 0.05 and 0.3, providing a dense thin film with controlled orientation for enhanced piezoelectric characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional piezoelectric materials are used in inkjet recording heads, then the basic printing function is achieved, but the piezoelectric constant is insufficient to enable higher nozzle density and faster printing speeds
Solution Approach 1:
The patent uses a composite structure consisting of a buffer layer made of Pb((Zr1-xTix)1-yNby)O3 and a piezoelectric film made of relaxor material. This composite material system combines the orientation control capability of PZTN with the high piezoelectric properties of relaxor materials to achieve both high productivity and reliability
Solution Approach 2:
The patent optimizes the compositional parameters of the buffer layer by controlling the ratios of Zr, Ti, and Nb elements (where x is in range 0≦x≦1 and y is in range 0.05≦y≦0.3). This parameter optimization enables the buffer layer to provide appropriate lattice matching and orientation control for the piezoelectric film, thereby improving the overall piezoelectric constant and stability
2Manufacturing precision
If the piezoelectric constant is increased to achieve higher nozzle density, then printing resolution is improved, but the stability and reliability of the piezoelectric element deteriorates
Solution Approach 1:
The buffer layer made of Pb((Zr1-xTix)1-yNby)O3 acts as an intermediary between the base substrate and the piezoelectric film. It provides lattice matching and orientation control, mediating the interface properties to ensure both high piezoelectric constant in the film and overall stability of the piezoelectric element structure
Solution Approach 2:
The patent applies different material compositions and properties to different layers: the buffer layer is optimized for orientation control and lattice matching, while the piezoelectric film is optimized for high piezoelectric constant. This local optimization of quality in each layer contributes to both high nozzle density capability and overall stability
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 results in a piezoelectric element with improved piezoelectric constants and stability, enabling higher nozzle density and faster printing speeds while maintaining reliable performance.
Implementation Method 1
a piezoelectric element that uses a piezoelectric film... a piezoelectric element with a buffer layer and barrier layer of Pb((Zr1-xTix)1-yNby)O3 and a relaxor material piezoelectric film
Data Source
AI summary
A piezoelectric element includes a base substrate, a buffer layer formed above the base substrate, a piezoelectric film formed above the buffer layer, and a barrier layer formed above the piezoelectric film, wherein the buffer layer and the barrier layer are formed of Pb((Zr1-xTix)1-yNby)O3 of a perovskite type, where x is in a range of 0≦x≦1, and y is in a range of 0.05≦y≦0.3, and the piezoelectric film is formed of a relaxor material of a perovskite type.