Piezoelectric Element Voltage Path Control for Response Speed
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Solution Overview
Problem
Piezoelectric elements used in ink-jet printers face challenges in enhancing response performance due to large remanent polarization, making it difficult to change polarization direction near zero voltage, which limits their speed and efficiency.
Innovation Solution
A piezoelectric element design with specific electrode configurations and voltage paths that allow electric current to change through distinct paths, reducing remanent polarization and facilitating easier polarization direction changes, thereby improving deformation response to drive voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a piezoelectric element with large remanent polarization is used, then the polarization stability is improved, but the response speed deteriorates because it is difficult to change polarization direction near zero voltage
Solution Approach 1:
The patent changes the electrical parameters of the piezoelectric element by controlling the electric current paths during voltage application. By making the electric current increase and decrease through specific paths (first path: increase, second path: decrease, third path: increase, fourth path: decrease), the patent optimizes the polarization characteristics to achieve both stability and fast response speed.
2Ease of operation
If the voltage changes between positive and negative, then the piezoelectric element can drive liquid ejection, but the deformation response performance deteriorates due to difficulty in polarization direction change near zero voltage
Solution Approach 1:
The patent optimizes the electrical parameters by defining specific voltage application patterns that control electric current flow through different paths. This ensures rapid polarization direction changes during voltage transitions, improving deformation response performance while maintaining liquid ejection capability.
3Speed
If remanent polarization is reduced to improve response speed, then the polarization direction change near zero voltage is facilitated, but the electric charge saturation capability may deteriorate
Solution Approach 1:
The patent applies dynamic control of electric current paths based on the applied voltage state. By switching between different current paths (first, second, third, fourth paths) depending on whether voltage is increasing or decreasing and whether it is positive or negative, the patent dynamically optimizes both response speed and electric charge saturation capability.
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 design enhances the piezoelectric element's performance by allowing for higher deformation response to voltage changes, improving speed and efficiency, and stabilizing electric current, addressing the limitations of existing piezoelectric elements.
Implementation Method 1
a piezoelectric body disposed between the first electrode and the second electrode
Data Source
AI summary
An electric current based on electric charge produced on the piezoelectric body changes by going through a first path, a second path, a third path, and a fourth path in this order. On the first path, the electric current becomes larger as the voltage becomes higher. On the second path, the electric current becomes smaller as the voltage becomes higher. On the third path, the electric current becomes larger as the voltage becomes higher. On the fourth path, the electric current becomes smaller as the voltage becomes higher.