Fluid Ejection Device With Circulation Path
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Solution Overview
Problem
Fluid ejection devices, such as inkjet printheads, face challenges with ink blockage and clogging due to the sequential operation of thermal resistors or piezoelectric actuators, which can lead to inefficiencies in drop size variation and cross-talk between fluid ejection chambers.
Innovation Solution
Implementing a fluid circulation system with recirculating channels and drop ejecting elements, such as thermal resistors or piezoelectric actuators, that allow for independent operation of fluid ejection chambers and mitigate cross-talk through optimized channel geometries, including U-shaped and straight paths, to enhance fluid flow and prevent particle entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal resistors or piezoelectric actuators are used for sequential fluid ejection, then drop ejection function is achieved, but ink blockage and clogging occur
Solution Approach 1:
The fluid ejection system is divided into multiple independent fluid ejection chambers, each with its own actuator. This segmentation allows independent operation of each chamber, preventing sequential operation issues that cause ink blockage and clogging while maintaining reliable drop ejection functionality.
Solution Approach 2:
The patent implements a fluid circulation system that continuously moves ink through the chambers before ejection. This preliminary circulation action prevents particles from settling and causing blockage, ensuring reliable operation of the thermal resistors or piezoelectric actuators.
2Productivity
If sequential operation of actuators is used, then fluid ejection is achieved, but cross-talk between fluid ejection chambers occurs
Solution Approach 1:
Each fluid ejection chamber is completely isolated with its own actuator and fluid pathway. This segmentation eliminates cross-talk between chambers while maintaining high productivity through parallel operation capability, as each chamber can be actuated independently without affecting others.
Solution Approach 2:
The patent introduces independent fluid circulation pathways as intermediaries between the actuators and nozzles. These separate pathways prevent pressure waves and fluid interactions from transferring between chambers, eliminating cross-talk while preserving efficient fluid ejection.
3Reliability
If fluid circulation system is implemented, then ink blockage is reduced, but device complexity increases
Solution Approach 1:
The fluid circulation pathways are merged with the existing fluid ejection chambers and nozzles structure. The circulation system uses the same physical space and components, adding flow continuity functionality without significantly increasing overall device complexity.
Solution Approach 2:
The fluid circulation system serves multiple functions: it maintains continuous fluid flow to prevent blockage, enables parallel chamber operation, and provides particle removal. This multi-functionality justifies the added complexity by delivering multiple reliability benefits simultaneously.
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 fluid circulation system reduces ink blockage, enables precise control over drop sizes, and minimizes cross-talk between fluid ejection chambers, improving the reliability and efficiency of inkjet printing by maintaining fluid flow and preventing particle interference.
Implementation Method 1
thermal resistors or piezoelectric material membranes as actuators within fluidic chambers to eject fluid drops
Implementation Method 2
thermal resistors or piezoelectric material membranes as actuators within fluidic chambers to eject fluid drops
Data Source
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AI summary
A fluid ejection device includes a fluid slot, a first fluid ejection chamber communicated with the fluid slot and including a first drop ejecting element, a second fluid ejection chamber including a second drop ejecting element, and a fluid circulation path including a first portion communicated with the fluid slot and the second fluid ejection chamber, and a second portion communicated with the first fluid ejection chamber and the second fluid ejection chamber, with the fluid circulation path including a fluid circulating element within the first portion.