Liquid Discharge Drive Waveform Abnormality Detection Circuit
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Solution Overview
Problem
Existing liquid discharge devices with piezoelectric elements are prone to damage from liquid leakage, and existing abnormality detection methods are costly and inefficient, lacking effective means to differentiate between normal and abnormal drive waveforms.
Innovation Solution
A liquid discharge device with a drive waveform generation circuit that converts drive waveform voltage data into analog signals, amplifies them through voltage and current amplifiers, and compares outputs to detect abnormalities, allowing for precise monitoring and control of the liquid discharge operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid leakage protection is provided for the drive waveform generation circuit, then the reliability of the circuit is improved, but the device complexity increases due to additional protective components
Solution Approach 1:
The drive waveform generation circuit performs self-diagnosis by monitoring its own output signals. The abnormality detection unit detects leaks by comparing the drive waveform with expected characteristics, allowing the circuit to protect itself without external protective components.
Solution Approach 2:
The system implements feedback by monitoring the drive waveform output and using this information to detect abnormalities. The detection result feeds back to control the operation of the liquid discharge device, creating a closed-loop protection mechanism.
2Reliability
If abnormality detection is implemented to differentiate normal and abnormal drive waveforms, then the reliability is improved, but the device complexity increases due to additional monitoring components
Solution Approach 1:
The abnormality detection unit is integrated into the drive waveform generation circuit, merging the monitoring function with the existing circuit structure. This combination eliminates the need for separate external monitoring equipment while maintaining detection capability.
Solution Approach 2:
The drive waveform generation circuit monitors its own operation through the integrated abnormality detection unit, enabling self-diagnosis without requiring external inspection systems or additional complex monitoring infrastructure.
3Productivity
If the drive waveform generation circuit operates continuously, then the productivity is improved, but the risk of damage from liquid leakage increases
Solution Approach 1:
The system continuously monitors the drive waveform during operation and provides real-time feedback on the health status of the circuit. This enables continuous operation while maintaining awareness of potential issues through the abnormality detection unit.
Solution Approach 2:
The abnormality detection unit identifies potential problems before they cause circuit damage by monitoring drive waveform characteristics. This preliminary detection allows for preventive action, enabling continuous operation while mitigating damage risk through early warning.
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 solution enables effective detection of abnormalities in the drive waveform, allowing for timely intervention and reducing the risk of damage to the drive waveform generation circuit, thereby improving the reliability and efficiency of the liquid discharge process.
Implementation Method 1
a liquid discharge head employing a piezoelectric element (e.g., a piezo actuator)
Data Source
AI summary
A liquid discharge device includes a liquid discharge head to discharge liquid and circuitry configured to generate a drive waveform to drive the liquid discharge head. The circuitry converts, to an analog signal, drive waveform voltage data being a source of the drive waveform; amplifies in voltage the analog signal to generate a drive waveform voltage signal; amplifies in current the drive waveform voltage signal to generate the drive waveform; monitors the drive waveform to detect an abnormality of the drive waveform; controls an operation of the liquid discharge device based on a result of detection of the abnormality of the drive waveform; compares an output of the voltage amplifier and an output of the current amplifier to output a difference between the output of the voltage amplifier and the output of the current amplifier; and outputs a binarized signal based on the difference.