Inkjet Printer Gas Cushion Substrate Flatness Control
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Solution Overview
Problem
Inkjet printing faces precision challenges due to micro-scale deviations in timing, quantity, and rate of print material ejection, as well as imprecision in substrate positioning, leading to printing faults and off-target material deposition.
Innovation Solution
An inkjet printer system with a gas cushion substrate support and proximity sensors to detect and adjust the substrate's distance from the support surface, ensuring precise positioning and flatness control, using a combination of gas ejection and evacuation holes to maintain the substrate at a desired elevation and adjust its position dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If substrate positioning is not precisely controlled, then the printing process is simpler and faster, but the print material arrives off-target and printing precision deteriorates
Solution Approach 1:
The system performs preliminary substrate flatness detection using proximity sensors before the printing process begins. This allows the control system to pre-adjust the substrate position and identify flatness variations ahead of time, ensuring precise positioning during printing without adding complexity to the actual printing operation.
Solution Approach 2:
Proximity sensors continuously detect the distance between the substrate and print head, providing real-time feedback to the control system. This feedback loop enables dynamic adjustment of substrate positioning during printing, maintaining precision without requiring an overly complex mechanical positioning system.
2Manufacturing precision
If substrate distance from print ejectors is not precisely controlled, then the printing process is simpler, but the print material traverses unexpected distance and arrives early or late
Solution Approach 1:
The system replaces complex mechanical substrate positioning mechanisms with a gas cushion support system. This pneumatic system provides smooth, vibration-free substrate elevation control, enabling precise distance maintenance between substrate and print head without the mechanical complexity of traditional positioning systems.
Solution Approach 2:
The system dynamically adjusts the gas cushion pressure to change substrate elevation, thereby controlling the distance between substrate and print ejectors. This parameter-based control allows precise adjustment of print material traversal distance without complex mechanical modifications.
3Manufacturing precision
If gas cushion pressure is increased to raise substrate, then substrate elevation improves, but gas consumption increases and system complexity worsens
Solution Approach 1:
The gas cushion system is divided into multiple independently controllable zones with individual pressure control. This segmentation allows the system to apply gas pressure only where needed to correct local flatness variations, minimizing overall gas consumption while maintaining substrate flatness precision.
Solution Approach 2:
The proximity sensors and control system automatically detect substrate flatness variations and adjust gas cushion pressure without external intervention. This self-regulating system maintains optimal substrate elevation with minimal gas consumption by making only the necessary pressure adjustments.
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 enhances precision in inkjet printing by maintaining precise substrate positioning and flatness, ensuring that print material arrives at the target location on the substrate, thereby improving the accuracy and reliability of the printing process.
Implementation Method 1
A gas cushion substrate support elevates a substrate a controlled distance above a support surface
Implementation Method 2
A proximity sensor in the support surface detects distance to the substrate
Data Source
AI summary
An inkjet printer is described. The inkjet printer has a gas cushion substrate support; a print assembly comprising a dispenser with an ejection surface facing the gas cushion substrate support; and a proximity sensor disposed in a surface of the gas cushion substrate support facing the ejection surface. A method is described that includes disposing a workpiece on a gas cushion support of an inkjet printer; supporting the workpiece on a gas cushion above a surface of the gas cushion support; detecting a distance of the workpiece from the surface of the gas cushion support; determining a difference between the distance and a target distance; comparing the difference to a tolerance; and adjusting the distance of the workpiece from the surface of the gas cushion support based on the comparison.