Optical Fiber Coating Eccentricity Control via Resin Shear Force
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Solution Overview
Problem
Existing optical fiber manufacturing methods face complexity in reducing the eccentricity of the coating layer due to the need for intricate adjustments of the coating device's position and inclination.
Innovation Solution
An optical fiber manufacturing method and apparatus that coat the outer periphery of a bare optical fiber with resin, where the tension applied upstream and the shear force applied by the resin satisfy the condition t×sin θ > T1×tan θ, with a design maximum deviation amount and contact length between the resin and the fiber, to center the fiber within the die hole, thereby simplifying the configuration and reducing eccentricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the position and inclination of the coating device are adjusted to reduce the eccentricity of the coating layer, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent replaces the mechanical adjustment system (position and inclination adjustment mechanisms) with a force balance approach. By controlling the tension T1 and shear force t to satisfy the relational expression t×sin θ>T1×tan θ, the system achieves automatic centering of the optical fiber without requiring complex mechanical adjustment devices, thus reducing device complexity while maintaining manufacturing precision.
Solution Approach 2:
The patent changes the control parameters from geometric parameters (position and inclination) to physical parameters (tension and shear force). By adjusting the tension T1 applied to the optical fiber and the shear force t generated by the resin, the system achieves precise control of the coating layer eccentricity through force balance rather than mechanical positioning, simplifying the overall apparatus configuration.
2Manufacturing precision
If the tension applied to the bare optical fiber and shear force from resin are optimized to satisfy t×sin θ>T1×tan θ, then the manufacturing precision is improved, but the measurement and control difficulty increases
Solution Approach 1:
The patent incorporates tension measurement units and shear force measurement units that provide real-time feedback on the forces acting on the optical fiber. This feedback mechanism allows the control system to monitor and adjust the tension T1 and shear force t to maintain the relational expression t×sin θ>T1×tan θ, thereby achieving precise control of coating layer eccentricity while managing the measurement and control complexity through systematic monitoring.
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 approach effectively suppresses the eccentricity of the coating layer by ensuring the centering force from the resin exceeds the force resisting centering, allowing for a simpler apparatus configuration and improved manufacturing efficiency.
Implementation Method 1
a shear force applied to the bare optical fiber by the resin in the coating device is set to t (N)
Implementation Method 2
a tension applied to the bare optical fiber in an upstream of the coating device is set to T1 (N)
Data Source
AI summary
An optical fiber manufacturing method includes: coating an outer periphery of a bare optical fiber with a resin before curing by a coating device; and curing the resin with a coating curing device. The following equations are satisfied: t×sin θ>T1× tan θ and θ=tan−1 (d/L), where T1 is a tension in the upstream of the coating device, t is the shear force applied to the bare optical fiber by the resin, d is the design maximum value of a deviation amount of an entry position of the bare optical fiber into the resin in the coating device with respect to the center axis of the die hole of the coating device, and L is the contact length between the resin and the bare optical fiber in the coating device along the center axis.