Drop-on-Demand Nozzle Fluid Sensing and Real-Time Parameter Adjustment
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Solution Overview
Problem
Drop-on-demand inkjet printers experience performance shifts due to environmental or usage factors, affecting print consistency and quality over time.
Innovation Solution
A self-contained printing system with a drop-on-demand inkjet print head, sensing system, and controller that adjusts ejection parameters based on real-time sensing of fluid characteristics, ensuring precise control over fluid quantity and quality, and recalibrates nozzles to maintain consistent print performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drop-on-demand inkjet printers operate over time, then productivity is maintained, but print performance consistency deteriorates due to shifts and changes
Solution Approach 1:
The patent implements a feedback mechanism where a sensor detects actual droplet characteristics (size, placement, volume) during printing operations. This detected information is fed back to the controller, which adjusts ejection parameters in real-time to compensate for performance drift, thereby maintaining print consistency over continuous operation
Solution Approach 2:
The system dynamically changes ejection parameters (voltage, pulse duration, frequency) based on detected performance variations. The controller modifies these parameters in response to sensor feedback to compensate for nozzle wear, environmental changes, and other factors that cause performance degradation over time
2Manufacturing precision
If ejection parameters are adjusted to maintain print quality, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The printing system performs self-diagnosis and self-adjustment through the sensor-controller feedback loop. The system automatically detects its own performance deviations and corrects them without external intervention, eliminating the need for manual calibration and reducing operational complexity despite adding sensing components
Solution Approach 2:
The sensor serves multiple functions: detecting droplet placement accuracy, measuring droplet size, monitoring ejection timing, and tracking performance trends over time. This multi-functionality justifies the added complexity by providing comprehensive monitoring and control capabilities from a single sensing system
Data Source
AI summary
Various apparatus and methods relating to determining a quantity measurement of fluid ejected by drop-on-demand nozzles and modifying the ejection parameters based upon the quantity measurement.