Liquid Ejection Head Asymmetric Flow Path Design
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Solution Overview
Problem
Existing liquid ejection heads face challenges in optimizing the flow path configuration, leading to inefficiencies in liquid supply and pressure distribution, which can result in stagnation and clogging, affecting printing quality and the time it takes for the device to become usable after filling.
Innovation Solution
The liquid ejection head incorporates a unique flow path configuration where the first and second individual flow paths are connected to the pressurizing chamber in a manner that reduces pressure differences caused by both pressure loss and gravity, optimizing the liquid flow and filling process by adjusting the connection positions and flow path resistances, thereby minimizing stagnation and enhancing printing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pressurizing chamber and common flow path are connected using two individual flow paths, then the liquid supply is improved, but pressure differences and stagnation may occur affecting printing quality
Solution Approach 1:
The patent applies local quality by making the flow paths asymmetric in their connection to the pressurizing chamber. Specifically, the first flow path connects at a first position while the second flow path connects at a second position that is offset in the flow direction. This asymmetric local configuration ensures that liquid enters the pressurizing chamber from multiple locations with different flow characteristics, preventing stagnation while maintaining efficient supply.
Solution Approach 2:
The patent employs asymmetry by designing the flow paths to connect to the pressurizing chamber at different positions rather than symmetrically. The first and second flow paths have different connection points along the flow direction, creating an asymmetric flow distribution pattern that eliminates dead zones and ensures uniform liquid distribution throughout the pressurizing chamber, thereby preventing clogging and maintaining printing quality.
2Stability of the object's composition
If the connection positions of flow paths are adjusted, then pressure differences are reduced, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the connection positions of the flow paths to specific locations on the pressurizing chamber. By carefully selecting where the first and second flow paths connect (at different positions in the flow direction), the patent optimizes pressure distribution parameters to minimize pressure differences within the chamber, ensuring stable liquid composition and preventing stagnation without requiring complex additional components.
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 configuration improves the efficiency of liquid filling and reduces the time to achieve a usable state, stabilizes ink droplet ejection, and enhances printing quality by minimizing pressure differences and stagnation within the pressurizing chamber.
Implementation Method 1
The pressurizing chamber is pressurized, thereby ejecting the liquid from the ejection hole
Implementation Method 2
a connection position between the first flow path and the fourth flow path is located on a side of the first end portion, compared to a connection position between the second flow path and the fourth flow path
Implementation Method 3
reduces pressure differences caused by both pressure loss and gravity
Data Source
AI summary
A liquid ejection head includes a plurality of pressurizing chambers connected to a plurality of ejection holes, a plurality of first individual flow paths connected to the plurality of pressurizing chambers, a plurality of second individual flow paths and a plurality of third individual flow paths, a first common flow path is connected in common to the plurality of first and second individual flow paths, and a second common flow path is connected in common to the plurality of third individual flow paths. The first and second individual flow paths are connected to the same pressurizing chamber, the first individual flow path is connected to the first common flow path on a side of an opening end portion, compared to the second individual flow path. The first individual flow path is located opposite to a side where the ejection hole is open outward, compared to the second individual flow path.