Head Module Segmentation for Crosstalk Reduction
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Solution Overview
Problem
The existing head module designs for liquid ejection, such as inkjet printers, suffer from crosstalk issues due to pressure wave propagation, which leads to unstable liquid ejection from nozzle orifices, caused by fluid communication between supply and return manifolds via bypass paths, resulting in amplified pressure waves.
Innovation Solution
The head module is configured with separate island portions for supply and return manifolds, each connected via bypass paths that prevent merging of pressure waves, reducing crosstalk by ensuring that pressure waves from different paths are out of phase, thus minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the supply manifold and return manifold are in fluid communication via a bypass path to enable manifold circulation, then liquid can flow smoothly through the system, but pressure waves from individual channels merge and amplify, causing crosstalk that destabilizes liquid ejection
Solution Approach 1:
The head module is divided into multiple independent island portions, where each island portion contains its own supply manifold and return manifold that are not in fluid communication with each other. This segmentation prevents pressure waves from merging across islands, eliminating crosstalk while maintaining manifold circulation benefits within each isolated island.
2Productivity
If a bypass path connects the supply manifold and return manifold, then liquid circulation is improved, but pressure wave propagation is amplified causing crosstalk phenomenon
Solution Approach 1:
The manifold system is segmented into multiple independent island portions, each with its own bypass path for liquid circulation. This segmentation allows liquid circulation to occur within each island while preventing pressure wave propagation between islands, thereby eliminating crosstalk.
3Loss of energy
If pressure waves travel through the supply manifold and return manifold that are in fluid communication, then the pressure waves merge via the bypass path, but this amplification causes crosstalk that makes liquid ejection unstable
Solution Approach 1:
The head module is segmented into multiple independent island portions that are not in fluid communication with each other. This segmentation causes pressure waves from different channels to dissipate within each isolated island rather than merging and amplifying across the entire manifold system, thereby preventing crosstalk and maintaining ejection stability.
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 stabilizes liquid ejection by reducing the effect of crosstalk, ensuring consistent and reliable droplet formation and ejection from nozzle orifices, enhancing the overall performance of the liquid ejection apparatus.
Implementation Method 1
The first bypass path may provide fluid communication between the first supply manifold and the second return manifold
Implementation Method 2
a pressure wave generated in a pressure chamber of an individual channel may propagate by two routes
Data Source
AI summary
A head module includes first individual channels each including a first nozzle orifice; a first supply manifold being in fluid communication with the first individual channels and configured to allow liquid to flow into the first individual channels therefrom; a first return manifold being in fluid communication with the first individual channels and configured to allow liquid not ejected from the first nozzle orifices to flow thereinto; second individual channels each including a second nozzle orifice; a second supply manifold being in fluid communication with the second individual channels and configured to allow liquid to flow into the second individual channels therefrom; a second return manifold being in fluid communication with the second individual channels and configured to allow liquid not ejected from the second nozzle orifices to flow thereinto; and a first bypass path providing fluid communication between the first supply manifold and the second return manifold.