Inkjet Nozzle Liquid Level Stabilization via Pressure Feedback
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Solution Overview
Problem
Inkjet head units used in printing processes on transparent substrates face challenges in maintaining a consistent liquid level at the nozzle, leading to non-jetting or poor jetting due to fluctuations in the internal water level of the reservoir.
Innovation Solution
A substrate treating liquid supply unit is designed with a first reservoir connected to the inkjet head unit, a water level sensor for real-time measurement, and a pressure control module that compensates for pressure variations based on water level changes, ensuring a constant liquid level at the nozzle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If real-time water level measurement and pressure compensation are implemented, then liquid level stability at the nozzle is improved, but device complexity increases
Solution Approach 1:
The system implements a feedback control mechanism where the water level sensor continuously monitors the liquid level in the reservoir and sends signals to the pressure control module. The pressure control module adjusts the internal pressure of the reservoir in real-time based on the water level feedback, compensating for fluctuations and maintaining stable liquid level at the nozzle. This closed-loop feedback system resolves the contradiction by automating the stabilization process, improving liquid level stability while the complexity is managed through integrated control electronics.
Solution Approach 2:
The invention replaces traditional mechanical level control mechanisms with electronic sensing and pressure control systems. Instead of using mechanical float valves or manual adjustment mechanisms, the system employs a water level sensor (electronic detection) and a pressure control module (electronic actuation) to maintain liquid level stability. This substitution reduces mechanical wear and improves response speed, though it introduces electronic components that increase overall device complexity.
2Manufacturing precision
If pressure compensation is continuously adjusted, then jetting quality is improved, but energy consumption increases
Solution Approach 1:
The pressure control module operates using periodic action by adjusting the internal pressure of the reservoir only when water level changes are detected by the sensor. Instead of continuous pressure adjustment, the system monitors the water level and activates pressure compensation only when needed, maintaining stable jetting quality while reducing energy consumption during periods when the liquid level is stable. This on-demand periodic adjustment resolves the contradiction between jetting quality and energy consumption.
Solution Approach 2:
The system implements dynamic pressure control where the pressure compensation is adjusted in real-time based on the actual water level conditions. The pressure control module dynamically responds to water level changes, increasing or decreasing pressure as needed to maintain consistent liquid level at the nozzle. This dynamic adjustment ensures high jetting quality while avoiding unnecessary energy consumption that would result from constant maximum pressure application.
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 solution effectively maintains the liquid level at the nozzle of the inkjet head unit, enhancing jetting quality and extending the lifespan of the inkjet head unit by preventing wetting and drying phenomena.
Implementation Method 1
a pressure control module compensating for a pressure provided to the first reservoir based on an amount variation in the water level of the substrate treating liquid
Implementation Method 2
a water level sensor measuring a water level of the substrate treating liquid stored in the first reservoir
Data Source
AI summary
Provided are a substrate treating liquid supply unit for constantly maintaining a liquid level of a nozzle of an inkjet head unit through real-time water level measurement, and a substrate treating apparatus including the same. The substrate treating liquid supply unit includes: a first reservoir connected to an inkjet head unit for jetting a substrate treating liquid onto a substrate and providing the substrate treating liquid to the inkjet head unit; a water level sensor measuring a water level of the substrate treating liquid stored in the first reservoir; and a pressure control module compensating for a pressure provided to the first reservoir based on an amount variation in the water level of the substrate treating liquid, wherein a liquid level of a nozzle of the inkjet head unit is constantly maintained.