UV-Excited Fluorescent Ink Printing Defect Detection
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Solution Overview
Problem
In high-level color reproduction printing, waste of sheets and ink occurs due to repeated corrections of output colors, especially when using ultraviolet-excited fluorescent inks, as defects like nozzle clogging are difficult to detect early, leading to unnecessary ink and paper consumption.
Innovation Solution
A liquid discharge apparatus with an integrated ultraviolet irradiation light source and a window allows for early visualization of images printed with ultraviolet-excited fluorescent inks, enabling operators to detect defects and correct them promptly, reducing resource wastage by allowing for real-time monitoring of the printing state without requiring significant changes to the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If printing is performed with ultraviolet-excited fluorescent inks, then high-level color reproduction is achieved, but defects like nozzle clogging are difficult to detect early, leading to waste of ink and paper
Solution Approach 1:
The patent applies preliminary action by introducing an ultraviolet irradiation light source that activates fluorescent inks immediately after they are discharged onto the recording medium. This allows the image to be visualized in real-time during the printing process, enabling early detection of defects such as nozzle clogging before the printing is completed, thus preventing waste of ink and paper while maintaining high-level color reproduction quality
2Difficulty of detecting and measuring
If printing is interrupted to check the printing state, then defects can be detected, but productivity is reduced due to repeated corrections and interruptions
Solution Approach 1:
The patent implements continuity of useful action by enabling continuous visual monitoring of the printing state through real-time fluorescence activation. The ultraviolet irradiation light source continuously illuminates the recording medium during printing, allowing operators to detect defects without interrupting the printing process, thereby maintaining productivity while improving printing state visibility
3Difficulty of detecting and measuring
If a window is added for visual checking, then defect detection is enabled, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the ultraviolet irradiation light source to serve multiple functions: it activates the fluorescent inks for real-time visualization, enables defect detection, and allows continuous monitoring during printing. This multi-functional approach enables image visibility enhancement without significantly increasing device complexity, as the same component performs multiple critical functions
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 enables timely detection and correction of printing defects, thereby saving resources such as ink and paper, and reducing the time required for image checks, while ensuring operator safety through the use of a UV-blocking window.
Implementation Method 1
irradiating a surface of the printing sheet with ultraviolet light to visualize an image
Implementation Method 2
The window is near the liquid discharge head. The image on the recording medium is visually recognizable through the window
Data Source
AI summary
A liquid discharge apparatus includes a liquid discharge head and a window. The liquid discharge head discharges a liquid onto a recording medium to form an image. The window is near the liquid discharge head. The image on the recording medium is visually recognizable through the window.