Inkjet Nozzle Evaluation via Erasable Test Marks
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Solution Overview
Problem
Inkjet printing technologies face challenges in ensuring consistent alignment and stability of nozzles, which affects the quality of deposited materials, particularly in applications like semiconductor-based electronic devices where precise alignment and uniformity are critical.
Innovation Solution
A method and system for evaluating nozzle performance by repeatedly printing test marks on a substrate, acquiring images, and comparing them for consistency and stability, with erasable substrates and wiper systems to ensure accurate alignment and selection of suitable nozzles for printing applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nozzles are repeatedly operated to print test marks on a substrate for evaluation, then nozzle performance can be assessed for alignment and stability, but the substrate becomes contaminated with multiple test marks requiring erasure and reuse
Solution Approach 1:
The substrate is used to print test marks for nozzle evaluation, then the test marks are erased using a wiper system to recover the substrate for repeated use. This allows continuous nozzle testing without discarding the substrate, resolving the contradiction between obtaining measurement data and avoiding substrate contamination.
Solution Approach 2:
The system includes imaging and analysis components that provide feedback on nozzle performance based on the test marks printed on the substrate. This feedback mechanism enables precise evaluation of nozzle alignment and stability while the eraser system resets the substrate for continued testing.
2Stability of the object's composition
If multiple test marks are printed on the same substrate for nozzle evaluation, then nozzle stability can be assessed over time, but the complexity of managing substrate erasure and reuse increases
Solution Approach 1:
The evaluation system combines the printing head, imaging system, and wiper-based erasure system into an integrated setup. The wiper system merges the erasure function with the substrate handling process, allowing multiple test marks to be printed and erased on the same substrate without requiring separate complex subsystems.
Solution Approach 2:
The substrate serves its own purpose of being tested and then reset for retesting. The wiper system provides self-contained erasure capability directly at the printing location, eliminating the need for separate substrate processing equipment and reducing overall system complexity.
3Manufacturing precision
If nozzles are evaluated for alignment by printing test marks at different times, then consistent alignment can be ensured, but the time required for repeated printing and evaluation increases
Solution Approach 1:
The system performs preliminary printing of test marks on the substrate before final nozzle selection for production. By pre-evaluating nozzle alignment and stability through repeated test printing, the system identifies suitable nozzles in advance, ensuring manufacturing precision while reducing time loss through advance preparation.
Solution Approach 2:
The evaluation process maintains continuous useful action by immediately reusing the substrate after erasure without interruption. The wiper system enables continuous cycling of test mark printing, erasure, and reprinting on the same substrate, maximizing the utility of each substrate and minimizing idle time between evaluation cycles.
Data Source
AI summary
A method for evaluating performance of a plurality of nozzles of a printing head includes repeatedly operating each of the nozzles to print test marks on a surface of a substrate, each of the test marks printed by that nozzle being printed at a different time. At least once during the repeated operation of each of the nozzles, at least some of the test marks are erased from the surface. The test marks that were printed by that nozzle are inspected for a feature that is indicative of the performance of that nozzle.