Fluid Ejection Device With Circulation Path
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Solution Overview
Problem
Fluid ejection devices in inkjet printing systems face issues with ink blockage and clogging due to air bubbles and particles, which affect the performance and lead to cross-talk between fluid ejection chambers, and there is a need for efficient fluid circulation to manage drop sizes and maintain print quality.
Innovation Solution
The design incorporates a fluid circulation path with asymmetrical channel portions and object tolerant architectures between fluid ejection chambers, allowing for net fluid flow and preventing objects from entering the circulation channel, while also enabling the ejection of drops of varying sizes through differently sized nozzle openings and corresponding drop ejecting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid circulation path is implemented to prevent ink blockage and clogging, then reliability is improved, but device complexity increases
Solution Approach 1:
The fluid circulation path is merged with the existing fluid ejection chamber structure, allowing the circulation function to be integrated into the printing system without adding separate independent components. The circulation path shares walls and structures with the ejection chambers, reducing overall device complexity while maintaining reliability improvements.
Solution Approach 2:
The fluid circulation path serves multiple functions simultaneously: it prevents ink blockage and clogging by circulating fluid to remove particles and air bubbles, it manages drop sizes through controlled fluid movement, and it maintains print quality by preventing contaminants from entering nozzles. This multi-functionality reduces the need for separate systems for each function.
2Productivity
If asymmetrical channel portions are used to enable net fluid flow, then productivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The channel portions of the fluid circulation path are designed with asymmetrical dimensions, where different channel sections have different cross-sectional areas or lengths. This asymmetry creates a net fluid flow direction from larger to smaller channel portions, enabling effective fluid circulation and particle removal while maintaining manufacturability through deliberate dimensional variations.
3Reliability
If object tolerant architecture is implemented to prevent contaminants from entering circulation channel, then reliability is improved, but device complexity increases
Solution Approach 1:
The object tolerant architecture acts as an intermediary structure between the fluid ejection chambers and the fluid circulation path. It includes features such as filtered openings or mesh structures that allow fluid to pass from the ejection chambers into the circulation path while blocking particles and air bubbles. This intermediary structure protects the circulation system from contaminants without requiring complex filtration systems elsewhere.
4Adaptability or versatility
If differently sized nozzle openings are used to eject drops of varying sizes, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
Different nozzle openings within the same printhead are designed with different local qualities, specifically different opening sizes and shapes. Each nozzle is optimized for its specific function: some nozzles have larger openings for ejecting larger drops, while others have smaller openings for finer drops. This local differentiation allows the system to handle varying drop size requirements while maintaining manufacturing feasibility through standardized fabrication processes.
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 solution effectively reduces ink blockages, enhances drop ejection momentum, and minimizes cross-talk between fluid ejection chambers, ensuring consistent print quality by maintaining fluid flow and preventing contaminants from entering the ejection chambers.
Implementation Method 1
the fluid circulation path includes first and second channel portions between the fluid ejection chambers, each having a different cross-sectional area, such that net fluid flow occurs in the fluid circulation path
Implementation Method 2
object tolerant architectures between fluid ejection chambers, allowing for net fluid flow and preventing objects from entering the circulation channel
Implementation Method 3
thermal resistors or piezoelectric material membranes as actuators within fluidic chambers to eject fluid drops
Data Source
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 communicated with the fluid slot and including a second drop ejecting element, a fluid circulation path communicated with the first fluid ejection chamber and the second fluid ejection chamber, and a fluid circulating element within the fluid circulation path.