Inkjet Head Driving Waveform Suppresses Misting
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Solution Overview
Problem
Inkjet heads using draw-draw driving waveforms often experience misting during ink droplet formation, leading to deteriorated printing quality.
Innovation Solution
An inkjet head with a specific driving waveform that includes an ejection pulse portion where the ink pressure chamber expands and then contracts, with a potential difference between the second and third voltages being greater than that between the third and first voltages, effectively preventing misting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a draw-draw driving waveform is used to eject ink droplets, then ink can be ejected from the nozzle, but ink misting occurs during droplet formation which deteriorates printing quality
Solution Approach 1:
The patent applies dynamics by transitioning from a static, simple voltage waveform to a dynamic, multi-stage voltage waveform that changes over time. The driving waveform includes a first voltage for chamber expansion, a second voltage for controlled contraction, and a third voltage for complete contraction, creating a time-varying pressure profile that dynamically controls ink ejection to prevent misting while maintaining productivity
Solution Approach 2:
The patent employs periodic action through a cyclic driving waveform that repeatedly applies expansion and contraction phases. The waveform periodically switches between different voltage levels (first, second, and third voltages) to create rhythmic pressure changes in the ink pressure chamber, enabling controlled droplet formation and ejection without misting
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 described driving waveform effectively suppresses ink misting during droplet formation, thereby improving printing quality by ensuring clearer and more precise ink droplet ejection.
Implementation Method 1
an actuator that changes the volume of the ink pressure chamber
Implementation Method 2
The driving waveform includes an ejection pulse portion that changes from a first voltage to a second voltage at which the ink pressure chamber expands and then from the second voltage to a third voltage at which the ink pressure chamber contracts
Implementation Method 3
drive actuators, causing changes in volumes of ink pressure chambers in order to eject liquid droplets of ink from nozzles connected to the ink pressure chambers
Data Source
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AI summary
According to an embodiment, an inkjet head includes a nozzle that ejects ink, an ink pressure chamber that connects to the nozzle, an actuator that changes a volume of the ink pressure chamber, and an actuator driving circuit that drives the actuator with a driving waveform. The driving waveform includes an ejection pulse portion that changes from a first voltage to a second voltage at which the ink pressure chamber expands and then changes from the second voltage to a third voltage at which the ink pressure chamber contracts so as to eject the ink from the nozzle. The third voltage is between that of the first and second voltages in potential level. The potential difference between the second and third voltages is greater than the potential difference between the third and first voltages.