Liquid Ejecting Device Nozzle Velocity Correction
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Solution Overview
Problem
Existing liquid ejecting devices, such as printing apparatuses, face challenges in correcting landing position deviation due to errors in ink ejection velocity, which is not adequately addressed by current techniques, affecting the accuracy of liquid deposition during bi-directional and single-direction printing.
Innovation Solution
A liquid ejecting device that includes a control unit capable of forming ejection velocity test patterns to determine the ejection velocity of the liquid, calculating correction components based on this velocity, and adjusting the ejection timing to correct landing position deviations by setting a correction value, thereby improving the accuracy of liquid deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bi-directional printing correction methods are used, then landing position deviation during bi-directional printing is corrected, but errors in ink ejection velocity are not adequately addressed
Solution Approach 1:
The system performs preliminary measurement of actual ink ejection velocity by ejecting test droplets and detecting their landing positions. Based on this preliminary data, a correction value is calculated and stored before actual printing begins. This preliminary characterization of each nozzle's ejection velocity enables accurate compensation during subsequent printing operations.
Solution Approach 2:
The system uses detected landing positions of test droplets to calculate the actual ejection velocity, compares it with the intended ejection velocity, and generates a correction value. This feedback loop allows the system to automatically compensate for manufacturing variations and characterize each nozzle's actual performance, improving both reliability and precision.
2Manufacturing precision
If individual nozzle ejection velocity measurement is implemented, then landing position accuracy is improved, but measurement and processing time increases
Solution Approach 1:
The ejection velocity measurement and correction value calculation is performed as a preliminary setup process before actual printing begins. By completing this characterization work in advance, the system avoids time-consuming measurements during production printing, thus minimizing time loss while maintaining high accuracy.
Solution Approach 2:
The system automatically performs the ejection velocity measurement, calculation, and correction value generation without requiring external intervention. The control unit autonomously coordinates the test droplet ejection, detects landing positions, calculates actual ejection velocities, and determines correction values, making the process efficient and self-contained.
Data Source
AI summary
A liquid ejecting device includes a supporting unit supporting a medium, an ejecting unit ejecting liquid onto the medium, a scanning driving unit moving the ejecting unit, and a control unit controlling the ejecting unit and the scanning driving unit. The control unit is configured to be capable of performing, a first processing for forming a test pattern, and acquiring an ejection velocity parameter associated with an ejection velocity of the liquid detected from the test pattern, a second processing for calculating the ejection velocity of the liquid from the ejection velocity parameter, calculating a first correction component that depends on the calculated ejection velocity, and setting a correction value including the first correction component, and a third processing for correcting ejection timing of the liquid using the correction value, when the liquid is ejected from the ejecting unit onto the medium as the ejecting unit is moved.