Liquid Discharge Drive Method for Noise-Free Temperature Detection
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Solution Overview
Problem
In liquid discharge apparatuses, noise from the drive signal for the piezoelectric element interferes with temperature detection signals, leading to decreased accuracy in detecting the temperature of the liquid in the pressure chamber.
Innovation Solution
A method is implemented where a non-printing process is executed between printing processes to detect the potential of a resistor without discharging liquid, ensuring that the resistor's potential is measured when no liquid is being discharged, thus avoiding noise interference from the drive signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature detection is performed during printing process, then continuous monitoring is achieved, but noise from drive signal interferes with detection accuracy
Solution Approach 1:
The patent applies periodic action by executing temperature detection during non-printing periods (when no drive signal is applied to the piezoelectric element) rather than during active printing. This timing-based separation allows temperature measurement without noise interference from the drive signal, while still achieving periodic monitoring of the liquid temperature throughout the printing process
2Measurement precision
If non-printing process is inserted between printing processes, then temperature detection accuracy is improved, but printing throughput may decrease
Solution Approach 1:
The patent maintains continuity of useful action by utilizing the non-printing period (which is already necessary for paper feeding and head repositioning) to perform temperature detection. This approach does not add extra idle time to the printing process but rather performs measurement during existing non-printing intervals, thereby maintaining printing throughput while achieving accurate temperature monitoring
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 approach allows for accurate temperature detection of the liquid in the pressure chamber without interference, improving detection accuracy and preventing throughput decreases.
Implementation Method 1
a piezoelectric element applying a pressure to a liquid in the pressure chamber
Implementation Method 2
a resistor for measuring a temperature of the liquid in the pressure chamber
Data Source
AI summary
There is provided a drive method of a liquid discharge apparatus including a liquid discharge head that includes a nozzle, a pressure chamber, a piezoelectric element, a drive line, and a resistor that is made of the same material as any of the first electrode, the second electrode, and the drive line. The method includes: executing a non-printing process of preventing a liquid from being discharged toward a recording medium after executing a first printing process of printing a first image on the recording medium and before executing a second printing process of printing a second image on the recording medium; and detecting a potential of the resistor when a state of a potential applied to the drive line is in a state of causing no liquid to be discharged from the nozzle during an execution period of the non-printing process.