Inkjet Print Head Controller for Water Head Pressure Compensation
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Solution Overview
Problem
Inkjet printing devices face fluctuations in image density due to variations in the water head difference between the nozzle meniscus and the ink surface, leading to inconsistent ink ejection and print quality.
Innovation Solution
A printing device with a controller that adjusts print data based on ink information correlated with the height of the ink surface in the container, ensuring consistent ink ejection by compensating for changes in water head pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same discharge control is maintained regardless of water head difference changes, then the control system remains simple, but the ink ejection amount varies causing image density fluctuations
Solution Approach 1:
The controller dynamically adjusts discharge control parameters based on detected water head difference changes. When the water head difference varies, the controller modifies the discharge control signal to compensate for the pressure changes, thereby maintaining consistent ink ejection amount and image density while using the same hardware system.
Solution Approach 2:
The system incorporates a feedback mechanism where the water head difference is detected and fed back to the controller. The controller uses this feedback information to adjust the discharge control in real-time, creating a closed-loop system that maintains stable ink ejection despite varying water head conditions.
2Force
If the ink container is positioned higher to increase water head difference, then ink supply pressure improves, but the variation in water head difference causes greater ejection amount fluctuations
Solution Approach 1:
The controller dynamically adjusts discharge control parameters based on detected water head difference changes. When the water head difference varies, the controller modifies the discharge control signal to compensate for the pressure changes, thereby maintaining consistent ink ejection amount and image density while using the same hardware system.
Solution Approach 2:
The system detects water head difference changes in advance and applies compensatory control adjustments before they cause significant ejection amount variations. By anticipating and counteracting the effects of water head changes, the system prevents fluctuations in ink ejection amount.
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 solution stabilizes image density by adjusting ink ejection amounts according to ink surface height, reducing fluctuations and maintaining consistent print quality despite changes in ink level.
Implementation Method 1
a water head difference between a nozzle meniscus and the ink surface in the ink cartridge varies. When the water head difference fluctuates, the pressure at the nozzles changes.
Data Source
AI summary
A printing device is provided with a print head having a plurality of nozzles configured to eject ink droplets therefrom, a supplier configured to supply ink contained in a container to the print head, and a controller. The controller is configured to perform obtaining ink information having correlation with a height of a liquid surface of the ink contained in the container, obtaining subject image data representing an image to be printed, generating print data based on the subject image data, and causing the print head to eject ink droplets based on the print data. The generating includes adjusting the print data in accordance with the ink information.