Optical Fiber Ink-Jet Centering for Accurate High-Speed Marking
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Solution Overview
Problem
Existing methods for marking optical fibers are slow, prone to errors, and inefficient due to misalignment of optical fibers with the ink-jet stream, especially at high speeds, and color-based coding schemes are limited in capacity.
Innovation Solution
A high-speed optical fiber marking apparatus with a fiber positioning device that centers the fiber relative to the ink-jet stream using guide members and a controller to maintain precise alignment, allowing for accurate and rapid marking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional ink-jet marking methods are used on moving optical fibers, then marking can be performed, but marking accuracy deteriorates due to fiber misalignment with the ink-jet stream
Solution Approach 1:
A positioning device with guide members is introduced as an intermediary between the moving fiber and the ink-jet stream. The guide members physically guide and center the fiber within the ink-jet stream, ensuring accurate marking without requiring complex active alignment systems. This mediator structure simplifies the operation while maintaining high marking precision.
Solution Approach 2:
The patent replaces complex active mechanical alignment systems (motors, sensors, feedback loops) with a passive mechanical guiding structure. The guide members create a physical constraint that automatically centers the fiber through their geometric arrangement, eliminating the need for complex mechanical alignment mechanisms while maintaining marking accuracy.
2Productivity
If marking speed is increased to improve productivity, then output increases, but marking accuracy deteriorates due to fiber movement and misalignment
Solution Approach 1:
The positioning device with guide members serves as a mediator that maintains fiber alignment with the ink-jet stream even at high speeds. The guide members create a stable geometric relationship between the fiber path and marking location, allowing high-speed operation without sacrificing accuracy because the passive mechanical guidance remains effective regardless of fiber speed.
Solution Approach 2:
The fiber is pre-positioned and centered within the guide members before the marking process begins. This preliminary mechanical alignment ensures that the fiber enters the marking zone already properly positioned, eliminating the need for complex real-time alignment adjustments during high-speed operation and maintaining accuracy throughout the marking process.
3Adaptability or versatility
If color-based coding schemes are used to identify optical fibers, then identification can be performed, but the coding capacity is limited to about eighteen fibers
Solution Approach 1:
Instead of relying on a limited palette of colors, the coding system is segmented into multiple binary digits (bits) per mark. Each mark can represent multiple states (e.g., presence/absence, different positions, different patterns), allowing the system to encode information in segments rather than requiring a large number of distinct colors. This enables identification of hundreds or thousands of fibers using only a limited set of mark variations.
Solution Approach 2:
The coding system transitions from a single-dimensional color spectrum to multiple dimensions of marking variation. Instead of varying only color hue, the system uses multiple dimensions such as mark presence/absence, mark position, mark size, and mark pattern combinations. This dimensional expansion of the coding space dramatically increases the number of distinguishable codes while using the same limited physical marking resources.
4Adaptability or versatility
If markings are applied to the outer surface of optical fibers for identification, then fiber identification is enabled, but markings wear off over time due to normal wear and tear and manual handling
Solution Approach 1:
The patent replaces mechanical/adhesive marking methods (paint, ink, labels) with a non-mechanical approach using permanent visual marks on the fiber coating. These marks are applied in a way that integrates with the fiber's existing coating structure rather than adding separate layers that can peel or wear, significantly improving durability while maintaining identification functionality.
Data Source
Figure 1A
Figure 1B~1C
Figure 2A
AI summary
The apparatus and methods include moving an optical fiber over a fiber path that includes a marking location at which resides a marking unit that dispenses an ink-jet stream. A centering method is performed whereby the optical fiber is incrementally moved in a lateral direction through the path of the ink-stream and the mark number density of marks formed on the optical fiber is measured along with the optical fiber position. A process window is defined by the range of lateral fiber positions over which a target mark number density is formed on a consistent basis. A controller calculates an optimum fiber path position and stores it memory for future reference while also moving the fiber path to the optimum position. The initially wet ink marks are dried and the fiber coated with a transparent protective overcoat to form a coated and marked optical fiber.