Liquid Ejection Head Parallel Laminar Flow Interface
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Solution Overview
Problem
Existing liquid ejection head technologies face challenges in stabilizing ejection performance due to variations in the shape of the inflow portion, which affect the interface between different liquids within the liquid flow passage, leading to inconsistent ejection outcomes.
Innovation Solution
The liquid ejection head stabilizes performance by arranging the first and second liquids in the height direction of the liquid flow passage, using a configuration where the first liquid flows below the second liquid, with controlled flow rates and viscosities to maintain parallel laminar flows and a stable interface, allowing for efficient ejection of droplets with predetermined ratios of the first and second liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first liquid and second liquid are arranged in the height direction of the liquid flow passage, then the ejection performance is stabilized, but the device complexity increases due to precise flow rate and viscosity control requirements
Solution Approach 1:
The patent adjusts the flow rates and viscosities of the first and second liquids as controllable parameters to achieve stable parallel laminar flow and a consistent interface between the liquids. By optimizing these parameters, the system maintains reliable ejection performance without requiring complex mechanical control mechanisms.
2Stability of the object's composition
If a movable separation diaphragm is used to completely isolate the first liquid and second liquid, then the liquid isolation is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the movable separation diaphragm component entirely and replaces it with a passive interface formed by controlling the flow and physical properties of the liquids themselves. This extraction of the complex mechanical isolation component simplifies the device structure and manufacturing process while maintaining effective liquid separation through the natural interface between immiscible liquids.
3Stability of the object's composition
If the first liquid and second liquid are arranged in parallel laminar flow, then the interface stability is improved, but the manufacturing precision requirements increase for maintaining proper flow rates and viscosities
Solution Approach 1:
The patent establishes specific relationships between flow rates and viscosities of the two liquids to achieve stable parallel laminar flow. By controlling these parameters within appropriate ranges and maintaining the proper ratio between them, the system achieves interface stability without requiring extremely high manufacturing precision.
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 ensures stable ejection operations by maintaining a consistent interface and flow dynamics, enabling the precise control of droplet composition and improving printing quality, particularly in inkjet printing applications.
Implementation Method 1
maintain parallel laminar flows and a stable interface
Implementation Method 2
cause the bubbling medium to generate a bubble by using a heat generation element
Data Source
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AI summary
A first inflow port (20) allows a first liquid (31) to flow into a liquid flow passage (13), and a second inflow port (21) allows a second liquid (32) to flow into the liquid flow passage (13). The first and second liquids (31, 32) flow toward a pressure chamber (18). There is a portion satisfying L ≥ W, where L is a length of the first inflow port (20) and W is a length of the liquid flow passage (13) above the first inflow port (20), in a direction orthogonal to a direction of flow of the first liquid (31) in the pressure chamber (18) and to a direction of ejection of the second liquid (32) from an ejection port (11). In a case where the second liquid (32) is ejected from bottom to top, the second liquid (32) flows above the first liquid (31).