Liquid Ejection Pulse Control for Stable Nozzle Micro-Vibration
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Solution Overview
Problem
Existing liquid ejecting apparatuses face challenges in stabilizing liquid ejection due to inappropriate amplitude settings of micro-vibration pulses, despite corrections to ejection pulses, leading to liquid thickening near nozzles.
Innovation Solution
A driving method and apparatus that include determining and setting the potential change width of micro-vibration pulses based on the maximum potential change width of ejection pulses and an upper limit threshold, ensuring stable liquid ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amplitude of the micro-vibration pulse is corrected in accordance with the correction of the amplitude of the ejection pulse, then the ejection amount can be standardized, but the amplitude of the micro-vibration pulse after correction may not be appropriate and liquid thickening occurs
Solution Approach 1:
The patent applies parameter changes by independently adjusting the amplitude of the micro-vibration pulse from the correction result of the ejection pulse amplitude. Specifically, the micro-vibration pulse amplitude is set to a predetermined value or adjusted based on separate criteria rather than directly following the ejection pulse correction, thereby ensuring both ejection amount standardization and appropriate micro-vibration characteristics to prevent liquid thickening
2Object-generated harmful factors
If the potential change width of the micro-vibration waveform element is increased to strengthen micro-vibration effect, then liquid thickening is reduced, but ejection stability deteriorates
Solution Approach 1:
The patent applies parameter changes by setting the potential change width of the micro-vibration waveform element within a specific range defined by a lower limit threshold value and an upper limit threshold value. This controlled parameter adjustment ensures sufficient micro-vibration effect to prevent liquid thickening while maintaining ejection stability through the upper limit constraint
Solution Approach 2:
The patent implements feedback by determining the waveform shape of the ejection pulse and using this information to set the potential change width of the micro-vibration waveform element. The system continuously monitors and adjusts the micro-vibration parameters based on the ejection pulse characteristics to maintain optimal performance and prevent both liquid thickening and ejection instability
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
Stabilizes liquid ejection by adjusting micro-vibration pulses, preventing liquid thickening and enhancing ejection consistency.
Implementation Method 1
a first ejection pulse having a first ejection waveform element that changes in potential to cause the pressure fluctuation for ejecting the liquid from the first nozzle
Implementation Method 2
a first micro-vibration pulse having a first micro-vibration waveform element that changes in potential to cause the pressure fluctuation without ejecting the liquid from the first nozzle
Data Source
AI summary
There is provided a driving method of a liquid ejecting apparatus in which a liquid ejects from a first nozzle by driving a first driving element with a first driving signal. The first drive signal includes a first ejection pulse having a first ejection waveform element that changes in potential to eject a liquid from a first nozzle, and a first micro-vibration pulse having a first micro-vibration waveform element that changes in potential to not eject the liquid from the first nozzle. The driving method includes: determining the first ejection pulse; and setting a potential change width of the first micro-vibration waveform element based on a maximum potential change width in the first ejection waveform element and a first upper limit threshold value. The first upper limit threshold value is a value of the potential change width with which the ejection of the liquid is stabilized.