Piezoelectric Actuator Voltage Control for Stable Printing
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Solution Overview
Problem
In known liquid ejecting apparatuses, changing the output voltage value of the driving power source circuit can lead to unstable behavior of the piezoelectric actuator, potentially resulting in unstable printing quality.
Innovation Solution
A printing method and apparatus that simultaneously change the output voltage values of both the driving power source circuit and the high potential power source circuit while printing, maintaining the stability of the piezoelectric actuator and printing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the output voltage value of the driving power source circuit is changed, then the output voltage value can be adjusted to meet different printing requirements, but the difference between the output voltage value of the driving power source circuit and the output voltage value of the high potential power source circuit changes, causing unstable behavior of the piezoelectric actuator and unstable printing quality
Solution Approach 1:
Before changing the output voltage value of the driving power source circuit, the output voltage value of the high potential power source circuit is changed in advance to maintain a constant voltage difference. This preliminary action prevents the piezoelectric actuator behavior from becoming unstable during the voltage adjustment process, thereby maintaining printing quality stability while enabling voltage adaptability.
2Loss of time
If the output voltage value of the driving power source circuit is changed in a stepwise manner, then the output voltage value can be stabilized in a short period of time in each step, but the difference between the output voltage value of the driving power source circuit and the output voltage value of the high potential power source circuit still changes, leading to unstable piezoelectric actuator behavior
Solution Approach 1:
Before performing stepwise voltage changes on the driving power source circuit, the high potential power source circuit's voltage is adjusted in advance to maintain constant voltage difference. This ensures that even during stepwise transitions, the piezoelectric actuator operates under stable voltage conditions, eliminating actuator instability while preserving the time-efficient stepwise voltage adjustment capability.
3Ease of operation
If only the output voltage value of the driving power source circuit is changed, then the voltage adjustment is simple and quick, but the printing quality becomes unstable due to changed piezoelectric actuator behavior
Solution Approach 1:
The voltage adjustment operations of the driving power source circuit and the high potential power source circuit are merged into a coordinated control process. When the driving power source circuit's voltage is adjusted, the high potential power source circuit's voltage is simultaneously adjusted to maintain a constant voltage difference. This combined operation preserves printing quality while enabling simple voltage adjustment through unified control.
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 allows for stable printing quality by maintaining the difference in output voltage values between the driving and high potential power source circuits, thereby stabilizing the behavior of the piezoelectric actuator.
Implementation Method 1
a piezoelectric actuator having an individual electrode, a high potential electrode, and a low potential electrode, and configured to apply pressure to liquid inside the individual channel
Data Source
AI summary
A printing method using a printing apparatus, the printing apparatus including: a liquid ejecting head including: a channel substrate having an individual channel; and a piezoelectric actuator having an individual electrode, a high potential electrode and a low potential electrode and applying pressure to liquid inside the individual channel, a driving power source circuit electrically connected to the individual electrode; a high potential power source circuit electrically connected to the high potential electrode; and a conveyor to convey a medium, the printing method comprising: ejecting the liquid from the liquid ejecting head with respect to the medium conveyed by the conveyor so as to print an image on the medium; and changing an output voltage value of each of the driving power source circuit and the high potential power source circuit while printing the image on the medium.