Liquid Ejecting Head Unit Dynamic Threshold Adaptation
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Solution Overview
Problem
Existing liquid ejecting systems, such as ink jet printers, face challenges in accurately detecting ejection failures due to drive element deterioration, especially when the manufacturer of the head is different from the printer main body, and require adaptive threshold values for varying ink types in pressure chambers.
Innovation Solution
A liquid ejecting system with a head unit incorporating a pressure chamber, drive element, vibration plate, and nozzle, where an input parameter for detecting ejection failures is input from a server through a network connection, allowing for dynamic adjustment of threshold values based on the degree of drive element deterioration and ink type changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed threshold value is used for detecting ejection failure, then the detection method is simple, but the detection accuracy deteriorates when the drive element deteriorates
Solution Approach 1:
The threshold value is changed from a fixed parameter to a dynamic parameter that automatically adjusts based on the drive element's deterioration state. The system detects residual vibration characteristics and adaptively updates the threshold value to maintain accurate ejection failure detection even as the drive element ages
Solution Approach 2:
The system changes the parameter (threshold value) based on the detected deterioration state of the drive element. By monitoring residual vibration and comparing it against dynamically updated thresholds, the system maintains detection accuracy without requiring complex manual recalibration
2Measurement precision
If the threshold value is adjusted to account for drive element deterioration, then the detection accuracy improves, but the device complexity increases
Solution Approach 1:
The system performs self-adjustment by automatically detecting its own deterioration state through residual vibration analysis and autonomously updating the threshold value. This eliminates the need for external intervention or complex manual calibration procedures
Solution Approach 2:
The system uses feedback from residual vibration detection to continuously monitor the drive element's state and automatically adjust the threshold value accordingly. This closed-loop approach maintains detection accuracy while keeping the system relatively simple
3Ease of operation
If a single threshold value is used for all ink types, then the system is simple to operate, but the detection accuracy deteriorates when ink type changes
Solution Approach 1:
The threshold value dynamically adapts to different ink types based on residual vibration characteristics. The system automatically adjusts the threshold without requiring manual reconfiguration when ink is replaced, maintaining both simplicity and accuracy
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
Enables accurate detection of ejection failures even with deteriorated drive elements and varying ink types, ensuring reliable printing operations by adapting threshold values for improved sensitivity and specificity.
Implementation Method 1
a liquid ejecting apparatus that ejects a liquid from a head by applying a drive pulse to a drive element such as a piezoelectric element
Implementation Method 2
a vibration plate that vibrates by drive of the drive element, and a nozzle through which a liquid is ejected by a pressure applied in the pressure chamber by vibration of the vibration plate
Data Source
AI summary
A liquid ejecting system includes a head unit that includes a pressure chamber, a drive element driven by an applied drive waveform, a vibration plate that vibrates by drive of the drive element, and a nozzle through which a liquid is ejected by a pressure applied in the pressure chamber by vibration of the vibration plate, and an input portion to which an input parameter for detecting an ejection failure of the liquid based on residual vibration of the vibration plate is input from a server through a network connection portion.