Liquid Ejection Head With Supported Gas-Permeable Film
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Solution Overview
Problem
Existing liquid ejection heads face instability due to the difficulty in effectively discharging bubbles through permeable partitions with large thickness, leading to inefficiencies in liquid ejection.
Innovation Solution
A liquid ejection head design incorporating a pressure chamber with a gas permeable film, a depressurization chamber, and a deformation suppression unit to manage bubbles, allowing for efficient bubble removal and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a permeable partition with large thickness is used, then the structural strength is improved, but the bubble discharge efficiency deteriorates
Solution Approach 1:
The invention divides the single thick permeable partition into multiple thin permeable partitions arranged in sequence. This segmentation allows bubbles to be discharged through each thin partition sequentially, maintaining high discharge efficiency while the cumulative structure provides sufficient structural strength.
Solution Approach 2:
Instead of increasing thickness in one dimension, the invention uses multiple thin partitions arranged in a sequential path, effectively using dimensional arrangement to achieve both structural integrity and functional efficiency.
2Ease of manufacture
If a thick permeable partition is used, then the manufacturing simplicity is improved, but the liquid ejection stability deteriorates
Solution Approach 1:
The invention segments the bubble discharge path into multiple thin partition stages, allowing each partition to be manufactured with standard thickness while collectively achieving the required liquid ejection stability through sequential bubble removal.
Solution Approach 2:
Different regions of the partition structure have different functions: thin regions for bubble discharge efficiency and multiple staged regions for overall stability, allowing each local area to be optimized for its specific purpose.
3Productivity
If a large pressure difference is applied to discharge bubbles, then the bubble removal speed is improved, but the energy consumption increases
Solution Approach 1:
The invention uses periodic pressure application across multiple staged partitions, where each partition handles a portion of the pressure difference requirement. This periodic, staged approach achieves effective bubble removal while distributing energy consumption across multiple lower-pressure stages rather than requiring one large pressure jump.
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 design enhances the stability and efficiency of liquid ejection by effectively managing bubbles, ensuring consistent and reliable operation.
Implementation Method 1
a gas permeable film capable of letting a gas permeate therethrough
Implementation Method 2
a pressure difference between the liquid reservoir chamber and the depressurization chamber
Data Source
AI summary
An object is to provide a liquid ejection head achieving improved stability of use. The liquid ejection head includes: an ejection port for ejecting the liquid; a pressure chamber provided with an energy generation element configured to generate an energy for ejecting the liquid from the ejection port; and a unit configured to remove a bubble from the liquid to be supplied to the pressure chamber. The unit has: a liquid reservoir chamber fluidly communicating with one end of the pressure chamber and capable of holding the liquid; a gas permeable film capable of letting a gas permeate therethrough; a depressurization chamber adjoining the liquid reservoir chamber with the gas permeable film therebetween; and a deformation suppression unit configured to contact the gas permeable film to suppress deformation of the gas permeable film.