Piezoelectric Inkjet Head Channel Tuning for Stable High-Speed Ejection
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Solution Overview
Problem
Existing liquid droplet ejecting heads face issues with under-refilling phenomena and residual vibrations during high-speed recording, which affect the ejection characteristics and stability of ink droplets.
Innovation Solution
A liquid droplet ejecting head with a channel resistance R1 of the inflow channel satisfying 3.48×10^13 ≤ R1 ≤ 6.98×10^13 Ω·m^5, and a length and cross-sectional area of the inflow channel within specific ranges, combined with a thin film piezoelectric element, to prevent under-refilling and quickly suppress residual vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving frequency is increased to perform high-speed recording, then the productivity is improved, but the residual vibration inside the individual channel cannot be suppressed quickly and the ejecting characteristic changes
Solution Approach 1:
The patent changes the physical parameters of the individual channel by optimizing the channel resistance R1 to satisfy 3.48×10^13 ≤ R1 ≤ 6.98×10^13 and the cross-sectional area S1 to satisfy 1.50×10^-12 m^2 ≤ S1 ≤ 3.00×10^-12 m^2. These parameter adjustments enable the channel to quickly suppress residual vibrations even at high driving frequencies, maintaining stable ejection characteristics while achieving high-speed recording.
2Quantity of substance
If the channel resistance is adjusted to prevent under-refilling, then the ink supply is improved, but the residual vibration suppression becomes insufficient
Solution Approach 1:
The patent simultaneously optimizes multiple parameters including channel resistance R1 (3.48×10^13 ≤ R1 ≤ 6.98×10^13) and cross-sectional area S1 (1.50×10^-12 m^2 ≤ S1 ≤ 3.00×10^-12 m^2). This multi-parameter adjustment ensures that the channel can both prevent under-refilling of ink and quickly suppress residual vibrations, resolving the trade-off between ink supply and vibration suppression.
3Productivity
If the ejecting period is shortened for high-speed recording, then the productivity is improved, but the residual vibration easily remains inside the individual channel
Solution Approach 1:
The patent adjusts the physical dimensions and resistance of the individual channel, specifically setting the cross-sectional area S1 between 1.50×10^-12 m^2 and 3.00×10^-12 m^2 and the resistance R1 between 3.48×10^13 and 6.98×10^13. These changes enable the channel to rapidly dampen vibrations within the shortened ejecting period, allowing high-speed recording without residual vibration interference.
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
Stable ink droplet ejection is achieved even at high driving frequencies, preventing under-refilling and residual vibrations, ensuring consistent ink supply and high-quality imaging.
Implementation Method 1
a piezoelectric element arranged on the channel member... The piezoelectric element is configured to apply pressure to a liquid inside the pressure chamber to cause a liquid droplet of the liquid to be ejected from the nozzle
Data Source
AI summary
There is provided a liquid droplet ejecting head including: a channel member having a plurality of individual channels and a first common channel communicating with an inlet port of each of the plurality of individual channels; and a piezoelectric element arranged on the channel member. Each of the plurality of individual channels includes a nozzle, a pressure chamber communicating with the nozzle and a first communicating channel having an end which is the inlet port and the other end which communicates with the pressure chamber. The piezoelectric element is configured to apply a pressure to a liquid inside the pressure chamber to cause a liquid droplet of the liquid to be ejected from the nozzle. A channel resistance R1 [N s/m5] of the first communicating channel satisfies a first relational expression: 3.48×1013≤R1≤6.98×1013.