Liquid Ejecting Head Filter Protrusions Reduce Flow Resistance
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Solution Overview
Problem
The flow-passage resistance in liquid ejecting heads is high due to the presence of filters in the liquid flow passages, which hinders efficient ink supply to individual nozzles.
Innovation Solution
A liquid ejecting head design featuring a filter with protruding portions in the common flow passage that do not contact the wall surfaces, reducing flow-passage resistance while effectively catching air bubbles, and allowing smooth ink supply to individual nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is provided in the common flow passage to remove air bubbles, then air bubble removal capability is improved, but flow-passage resistance increases
Solution Approach 1:
The filter is designed with protruding portions that are distributed at specific locations within the common flow passage rather than forming a continuous barrier. This local quality approach allows the filter to capture air bubbles at multiple points along the flow path while maintaining open channels that reduce overall flow resistance.
Solution Approach 2:
The filter structure is segmented into multiple discrete protruding portions rather than a single continuous element. Each protruding portion acts as an independent bubble-trapping element, and the spacing between them creates flow channels that minimize resistance while maintaining effective air bubble removal throughout the flow passage.
2Reliability
If a filter with protruding portions is provided in the common flow passage, then air bubble catching capability is improved, but turbulence and pressure changes increase
Solution Approach 1:
The protruding portions are strategically positioned at specific locations where air bubbles are most likely to accumulate, rather than uniformly distributed throughout the flow passage. This localized approach maximizes bubble catching efficiency while minimizing disruption to the overall flow pattern and reducing turbulence.
Solution Approach 2:
The protruding portions extend only partially into the flow passage rather than reaching the opposite wall. This partial extension is sufficient to trap air bubbles while leaving adequate flow channels open, thereby reducing the harmful effects of turbulence and pressure fluctuations compared to a more aggressive filter design.
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 design reduces flow-passage resistance and enhances air bubble catching capability, enabling efficient ink supply and improved print quality by minimizing turbulence and pressure changes.
Implementation Method 1
a filter comprised of a plurality of protruding portions protruding from a first wall surface among a plurality of wall surfaces of the first common flow passage is provided in the first common flow passage
Data Source
AI summary
A liquid ejecting head includes a plurality of individual flow passages and a first common flow passage. The plurality of individual flow passages is provided correspondingly to a plurality of nozzles from which a liquid is ejected. The first common flow passage is in shared communication with the plurality of individual flow passages and supplies a liquid to the plurality of individual flow passages. A filter is provided in the first common flow passage. The filter is comprised of a plurality of protruding portions protruding from a first wall surface among a plurality of wall surfaces of the first common flow passage. The plurality of protruding portions is not in contact with any of the plurality of wall surfaces of the first common flow passage, except for the first wall surface.