Liquid Ejecting Head Dual Resistance Flow Paths
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Solution Overview
Problem
Liquid ejecting heads face a trade-off between nozzle refilling performance and residual vibration attenuation, as high flow path resistance is needed for stable droplet ejection but can hinder quick refilling, and low resistance aids refilling but increases residual vibration.
Innovation Solution
The design incorporates first and second communication paths with different flow path resistances, where the first paths have higher resistance to attenuate pressure vibration and the second paths have lower resistance for efficient refilling, along with inertance and flexible compliance plates to manage pressure vibrations and prevent crosstalk between nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow path resistance is increased to attenuate residual vibration, then droplet ejection stability is improved, but nozzle refilling performance deteriorates
Solution Approach 1:
The flow path is divided into multiple segments with different resistance characteristics. The first communication path has higher flow path resistance to attenuate residual vibration, while the second communication path has lower flow path resistance to enable quick refilling. This segmentation allows each path to optimize for its specific function without compromising the other.
Solution Approach 2:
Different parts of the flow path system are given different resistance properties according to their specific functional requirements. The first communication path is designed with higher resistance locally to suppress vibration, while the second communication path is designed with lower resistance locally to facilitate rapid refilling, creating local quality optimization throughout the system.
2Productivity
If flow path resistance is decreased to improve nozzle refilling performance, then refilling speed is improved, but residual vibration increases
Solution Approach 1:
The refilling function is separated from the vibration attenuation function through distinct communication paths. The second communication path provides low resistance for rapid refilling, while the first communication path provides high resistance for vibration attenuation, allowing both functions to operate simultaneously without interference.
Solution Approach 2:
The first communication path acts as an intermediary element that mediates between the pressure chamber and the liquid chamber. It provides vibration attenuation while allowing the second communication path to handle the refilling function, thus protecting the refilling process from vibration interference.
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 approach enhances nozzle refilling performance while reducing residual vibration, leading to more stable and efficient ink droplet ejection by effectively managing pressure vibrations and preventing adverse effects on ejection characteristics.
Implementation Method 1
flow path resistance in the first communication paths is higher than flow path resistance in the second communication paths
Implementation Method 2
flow path resistance in the second communication paths is lower than flow path resistance in the first communication paths
Implementation Method 3
pressure generating sections such as piezoelectric elements that cause pressure vibration in the liquid in the pressure chambers
Data Source
AI summary
A liquid ejecting head includes nozzles configured to eject liquid, pressure chambers communicating with the nozzles, the pressure chambers being configured to generate pressure for ejecting the liquid, a first liquid chamber configured to store the liquid to be supplied to the pressure chambers, a second liquid chamber configured to store the liquid that passed through the pressure chambers, first communication paths communicating with the pressure chambers from the first liquid chamber, second communication paths respectively communicating with the second liquid chamber from between the pressure chambers and the nozzles in which flow path resistance in the first communication paths is higher than flow path resistance in the second communication paths.