Fluid Ejection Circulation via Asymmetric Pump Actuators
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Solution Overview
Problem
Inkjet printing systems face challenges such as ink blockage and clogging due to air bubbles, pigment agglomeration, and evaporation, leading to reduced print quality and increased ownership costs, with existing solutions being cumbersome and costly.
Innovation Solution
Implementing slot-to-slot fluid circulation using fluidic channels with asymmetrically located pump actuators to generate directional fluid flow, reducing ink blockage and clogging by circulating fluid between supply slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inkjet nozzles remain uncapped and exposed to ambient environments, then printing can be performed without capping mechanisms, but ink evaporation causes pigment agglomeration and viscous plug formation that block ink flow
Solution Approach 1:
The system performs preliminary fluid circulation before printing to pre-prevent pigment settling and agglomeration. By continuously circulating the ink through the printhead channels before use, the system maintains ink流动性 and prevents blockage formation in advance, allowing uncapped operation without reliability issues.
Solution Approach 2:
The patent implements continuous fluid circulation through the printhead during idle periods and between printing operations. This continuous action prevents pigment particles from settling and forming viscous plugs, maintaining reliable ink flow without requiring capping mechanisms, thus enabling ease of operation while preserving reliability.
2Reliability
If fluid circulation is implemented to prevent ink blockage, then print quality and reliability improve, but device complexity increases due to additional pump actuators and fluidic channels
Solution Approach 1:
The pump actuators serve dual functions: they enable on-demand ink ejection during printing and simultaneously provide fluid circulation during idle periods to prevent blockage. By making the ejection mechanism multi-functional, the system achieves improved reliability without adding separate dedicated circulation pumps, thus limiting the increase in device complexity.
Solution Approach 2:
The patent merges the ink ejection function and fluid circulation function into a single integrated system using the same pump actuators and fluidic channels. This consolidation achieves the reliability benefits of continuous circulation while avoiding the complexity increase that would result from separate independent circulation systems.
3Manufacturing precision
If pigment-based inks are used to achieve high print quality, then color accuracy improves, but pigment settling and agglomeration occur during storage that impede ink flow
Solution Approach 1:
The system performs preliminary fluid circulation before printing to pre-prevent pigment settling and agglomeration. By continuously circulating the ink through the printhead channels before use, the system maintains ink流动性 and prevents blockage formation in advance, allowing uncapped operation without reliability issues.
Solution Approach 2:
The patent implements continuous fluid circulation through the printhead during idle periods and between printing operations. This continuous action prevents pigment particles from settling and forming viscous plugs, maintaining reliable ink flow without requiring capping mechanisms, thus enabling ease of operation while preserving reliability.
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
Enhances print quality by preventing ink blockage and clogging, allowing for immediate on-demand printing while reducing manufacturing and ownership costs through efficient fluid circulation.
Implementation Method 1
Pump actuators in each closed chamber pump fluid through the channels from slot to slot
Implementation Method 2
passing electrical current through a heating element to generate heat and vaporize a small portion of the fluid within a firing chamber
Implementation Method 3
passing electrical current through a heating element to generate heat
Implementation Method 4
a piezoelectric inkjet printhead uses a piezoelectric material actuator to generate pressure pulses that force ink drops out of a nozzle
Data Source
AI summary
A fluid ejection device may include a discharge port, an energy generating element to discharge liquid through the discharge port, a first liquid supply on a first side of the discharge port, a second liquid supply on a second side of the discharge port opposite the first side, a first liquid flow path extending from the first liquid supply to the discharge port, a second liquid flow path extending from the second liquid supply to the discharge port and a fluid displacement actuator in the first liquid flow path.