Bubble Dissipating Structure in Inkjet Recirculation Channel
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Solution Overview
Problem
Fluid ejection devices, such as inkjet printheads, face issues with air bubbles and particles disrupting ink drop ejection, leading to print defects and degraded quality due to blockages and clogging in the ejection chambers.
Innovation Solution
Incorporating a bubble dissipating structure within the fluid circulation channel that prevents air bubbles and particles from entering the ejection chambers by dissipating them, allowing fluid to flow around the structure while maintaining chamber functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluid circulation channel is added to recirculate ink, then ink blockage and clogging are reduced, but device complexity increases
Solution Approach 1:
The bubble dissipating structure is integrated directly into the fluid circulation channel, combining two functions (bubble dissipation and fluid circulation) into a single unified component. This eliminates the need for separate bubble removal devices while maintaining ink recirculation, thus reducing device complexity while still preventing ink blockage.
Solution Approach 2:
The bubble dissipating structure serves multiple functions: it dissipates air bubbles, allows fluid circulation, and prevents particles from entering ejection chambers. By incorporating this multi-functional structure into the fluid circulation channel, the patent achieves reliable ink recirculation without adding excessive complexity.
2Reliability
If a bubble dissipating structure is positioned in the fluid circulation channel, then air bubbles are prevented from entering ejection chambers, but the channel flow path is obstructed
Solution Approach 1:
The bubble dissipating structure is designed as a segmented or porous component that divides the fluid flow into multiple pathways. This segmentation allows bubbles to be dissipated in specific zones while maintaining continuous fluid circulation through alternative paths, thus preventing bubble entry into ejection chambers without significantly obstructing overall channel flow.
Solution Approach 2:
The bubble dissipating structure is strategically positioned and designed to affect only local flow characteristics where bubbles are present. The structure allows fluid to pass through while dissipating bubbles in specific localized zones, maintaining overall fluid circulation productivity while achieving reliable bubble prevention in critical areas.
Data Source
AI summary
According to an example, a fluid ejection device may include a fluid feed slot, a plurality of fluid ejection chambers in fluid communication with the fluid feed slot, a plurality of drop ejecting elements, in which a drop ejecting element of the plurality of drop ejecting elements is positioned within each of the plurality of fluid ejection chambers, a fluid circulation channel in fluid communication at a first end of the fluid circulation channel with the fluid feed slot and in fluid communication at multiple second ends of the fluid circulation channel with the plurality of fluid ejection chambers, and a fluid circulating element within the fluid circulation channel. The fluid ejection device may also include a bubble dissipating structure positioned within the fluid circulation channel outside of the plurality of fluid ejection chambers.