Capillary Ink Stream Marking for High-Speed Optical Fiber
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Solution Overview
Problem
Ink jet printing for optical fibers is inefficient at high speeds due to fiber vibration, leading to missing or incorrectly formed marks, as it requires precise control of small ink droplets, which becomes challenging at higher speeds.
Innovation Solution
The use of multiple ink streams with different colors, where the optical fiber intersects these streams briefly to form color-coded marks, allowing for high-speed marking without the need for precise control of individual droplets, and a protective overcoat is applied for durability and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ink jet printing is used to form colored markings on optical fiber, then marking can be achieved, but at high fiber speeds the fiber vibrates causing ink droplets to miss the fiber and marking errors occur
Solution Approach 1:
The patent replaces the mechanical ink jet printing system with a capillary action-based ink stream system. Instead of using mechanical droplet ejection that is sensitive to vibration, the invention uses capillary forces to guide continuous ink streams along the fiber path, eliminating the need for precise mechanical droplet placement at high speeds.
Solution Approach 2:
The patent introduces capillary action as an intermediary mechanism between the ink source and the fiber surface. The capillary forces act as a mediator that automatically guides the ink streams along the fiber path without requiring direct mechanical control, thereby resolving the vibration issue at high speeds.
2Productivity
If ink jet printing is used for marking, then colored marks can be formed, but the system is limited to slow fiber speeds (2 m/s or slower)
Solution Approach 1:
The patent replaces the vibration-sensitive mechanical ink jet system with a capillary-driven continuous ink stream system. This substitution enables the marking process to operate reliably at high fiber speeds (greater than 2 m/s) by using capillary forces that are inherently resistant to vibration, thereby improving both productivity and reliability.
Solution Approach 2:
The patent employs continuous ink streams that move along with the fiber path, ensuring uninterrupted marking action. This continuous application method maintains reliable mark formation even at high speeds where intermittent or droplet-based systems would fail due to vibration and timing issues.
3Speed
If multiple ink streams are used to form color-coded marks, then high-speed marking is enabled, but the system complexity increases
Solution Approach 1:
The patent merges multiple capillary ink stream sources into a single integrated marking unit that operates along the fiber path. By combining the functionality of multiple ink streams within a unified system architecture, the invention achieves high-speed multi-color marking without proportionally increasing overall system complexity.
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 method enables high-speed marking with improved mark quality and versatility in ink types, including those with varying viscosities, and provides durable, visible color-coded marks on optical fibers.
Implementation Method 1
The ink streams reside adjacent the fiber path. Color-coded marks are produced on the optical fiber by adjusting the fiber path or the position of two or more adjacent ink streams so that the optical fiber at least partially intersects the two or more adjacent ink streams
Data Source
AI summary
The system and methods for marking an optical fiber with color-coded marks disclosed herein include forming closely spaced multiple ink streams, with at least two of the ink streams having different colors. The optical fiber moves over a fiber path that resides adjacent the ink streams. The fiber path and the ink streams are made to briefly intersect so that the ink streams form on the outer surface of the optical fiber a group of spaced apart individual marks, wherein the group of individual marks constitute a color-coded mark. Repeating this marking process at different times as the fiber moves over the fiber path forms spaced apart color-coded marks along the length of the fiber. Subsequent drying and overcoating of the marks fixes and protects the color-coded marks.