Overmolded Ferrule Boot Assembly for Fiber Alignment
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Solution Overview
Problem
The existing methods for arranging optical fibers into ferrule connectors are labor-intensive and time-consuming, particularly in the process of ribbonization, which involves securing fibers with tape for precise alignment and insertion.
Innovation Solution
An overmolded ferrule boot assembly is created by positioning optical fibers in an alignment fixture, injecting a flowable material, allowing it to cure, and then separating the components to form an integral ferrule boot that aligns and secures the fibers for easy insertion into a ferrule, using either a heat shrink alignment or a mold-based process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional tape-based ribbonization methods are used to arrange optical fibers, then fiber alignment can be maintained, but the process becomes labor-intensive and time-consuming
Solution Approach 1:
The patent replaces the manual mechanical process of applying tape to secure fibers with an automated injection molding process. A flowable material is injected into a mold containing the fibers, and upon curing, forms an integral ferrule boot assembly that secures the fibers without requiring manual tape application. This substitution of manual mechanical operations with automated material injection significantly increases assembly speed while maintaining fiber alignment precision.
Solution Approach 2:
The patent utilizes the parameter change of material state from flowable to cured. The flowable material is injected in a liquid or semi-liquid state, allowing it to flow around and secure the fibers, then upon curing, transforms into a solid structural component that maintains fiber position. This parameter change enables the material to perform both the securing function and the alignment function simultaneously, eliminating the need for separate tape application steps.
2Reliability
If manual tape application is used to secure fibers, then fiber position can be maintained, but the process requires significant human labor and time
Solution Approach 1:
The patent merges multiple functions into a single integrated process: the injection molded ferrule boot simultaneously provides fiber alignment, fiber securing, and structural support. The flowable material is injected directly onto the fibers in a predetermined arrangement, and upon curing, creates an integral structure that performs all these functions at once, eliminating the need for separate tape application and reducing manufacturing complexity.
Solution Approach 2:
The flowable material automatically adapts to the fiber arrangement and secures them in place through the injection and curing process. The material flows around the fibers, fills the mold cavity, and upon curing, forms a custom-fit structure that holds the fibers in their predetermined positions without requiring external securing elements like tape. This self-securing mechanism simplifies the manufacturing process while maintaining fiber position stability.
3Manufacturing precision
If ribbonization with tape is performed, then fibers can be arranged in sequence, but the process is time-consuming and reduces assembly efficiency
Solution Approach 1:
The patent employs preliminary action by pre-arranging the optical fibers in their final predetermined sequence and position within the mold before the flowable material is injected. The fibers are positioned in the mold cavity in the exact arrangement required for the final product, and the injected material then locks them in place. This eliminates the need for time-consuming post-assembly tape application and fiber adjustment, as the preliminary positioning is done during the injection molding process itself.
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 significantly reduces the time and effort required to align and insert optical fibers into ferrule connectors, ensuring precise positioning and efficient assembly by forming an integral ferrule boot that maintains fiber order and alignment.
Implementation Method 1
injecting a flowable material into a port on the alignment fixture, waiting a predetermined time for the flowable material to cure
Implementation Method 2
providing a heat shrink alignment portion to the alignment fixture. Similarly, some embodiments include waiting a first predetermined time for the alignment fixture to cure and after the first predetermined time, removing the heat shrink alignment portion from the plurality of fibers
Data Source
AI summary
Overmolded ferrule assemblies and methods for making the same are disclosed. Some embodiments include positioning a first plurality of fibers in an alignment fixture in a predetermined arrangement such that a predetermined length of the first plurality of fibers extends beyond an end of the alignment fixture. Similarly, some embodiments include positioning a cover portion of the alignment fixture onto the first plurality of fibers, such that corresponding cover recesses on the cover portion align with the corresponding base recesses on the base portion. One method includes the steps of injecting a flowable material into a port on the alignment fixture, waiting a predetermined time for the flowable material to cure, and after the predetermined time, separating the base portion and the cover portion from the first plurality of fibers and the flowable material to create the overmolded ferrule boot.