Liquid Ejecting Head Pressure Chamber Supply Unit Ratio
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Solution Overview
Problem
Existing liquid ejecting heads struggle with unstable ejection of liquids with viscosities higher than general ink, leading to flight deflection and shortage of ejection amount due to mismatched structural ratios between pressure chambers and ink supply paths.
Innovation Solution
A liquid ejecting method and apparatus where the liquid ejecting head has nozzles, a pressure chamber, and a supply unit with specific volume and channel length ratios, optimizing the movement of the liquid to stabilize high-viscosity liquid ejection, with the supply unit's volume between 1/5 and 1/2 of the pressure chamber's volume and channel lengths equal to or between 1/2 and twice that of the supply unit's length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an existing liquid ejecting head designed for low-viscosity ink is used to eject high-viscosity liquid, then the head structure can be maintained, but the ejection becomes unstable with flight deflection and shortage of ejection amount
Solution Approach 1:
The invention changes the structural parameters of the liquid ejecting head, specifically setting the supply unit volume to 0.05-0.5 times the pressure chamber volume and the channel length ratio between 0.5-2.0, to optimize performance for high-viscosity liquids while maintaining compatibility with existing head designs
Solution Approach 2:
The invention optimizes the dynamic characteristics of the liquid flow path by adjusting the supply unit volume and channel dimensions, enabling the system to adapt to the higher viscosity of the liquid and maintain stable ejection through improved flow dynamics
2Reliability
If the supply unit volume is increased to improve liquid supply stability, then ejection consistency improves, but the overall head size increases
Solution Approach 1:
The invention establishes optimal parameter ranges for the supply unit volume (0.05-0.5 times pressure chamber volume) and channel dimensions, achieving a balance between ejection consistency and compact head size through systematic parameter optimization
3Manufacturing precision
If the channel length in the pressure chamber is increased to improve liquid flow control, then ejection precision improves, but the ejection speed decreases
Solution Approach 1:
The invention optimizes the channel length ratio between pressure chamber and supply unit to fall between 0.5-2.0, achieving a balance between ejection precision through improved flow control and maintaining adequate ejection speed for practical applications
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
This configuration ensures stable ejection of high-viscosity liquids with consistent droplet amounts, maintaining image quality and printing speed comparable to standard ink ejection systems.
Implementation Method 1
a pressure chamber which applies a pressure variation to the liquid in order to eject the liquid from the nozzles
Data Source
Figure 1
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Figure 2B
AI summary
Provided is a liquid ejecting method, including ejecting a liquid from a liquid ejecting head, wherein: the viscosity of the liquid is in a range from 6 mPa·s to 15 mPa·s, the liquid ejecting head includes: nozzles which eject the liquid; a pressure chamber which applies a pressure variation to the liquid in order to eject the liquid from the nozzles; and a supply unit which communicates with the pressure chamber and supplies the liquid to the pressure chamber, the volume of the supply unit is more than 1/5 of the volume of the pressure chamber and is less than 1/2 of the volume of the pressure chamber, and the channel length of the pressure chamber is equal to or more than the channel length of the supply unit and is equal to or less than twice of the channel length of the supply unit.