Re-terminable Fiber Optic Connector Cam Mechanism
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Solution Overview
Problem
Field termination of re-terminable fiber-optic connectors is challenging due to their small size and the risk of accidental de-activation, and existing methods require labor-intensive steps like crimping, which can damage the connection and result in irreversible operations.
Innovation Solution
A re-terminable ST-type fiber-optic connector assembly with an internal cam mechanism that uses a hand-held cam activation tool for simplified field termination, featuring a ferrule holder with an alignment key and cam profiles for secure clamping without crimping, preventing inadvertent de-activation by keeping the cam unexposed when mated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crimping is used to activate the splice or retain the field fiber, then the connector can be activated, but the crimping operation can pull the field fiber and stub fiber apart or damage the signal passing function
Solution Approach 1:
The patent replaces the crimping mechanical system with a cam-based mechanical system. The cam mechanism uses rotational motion to actuate the fiber retention mechanism, eliminating the need for crimping operations that can damage fibers. The cam profile converts rotational input into linear actuation of the retention elements, providing controlled force application without the damaging effects of crimping.
Solution Approach 2:
The patent introduces a cam mechanism as an intermediary between the activation tool and the fiber retention system. This intermediary mechanism allows for controlled actuation of the fiber retention elements through rotational motion, providing a buffer that prevents direct force transmission that could damage the fibers while still achieving secure retention.
2Ease of manufacture
If crimping is used for termination, then the connector can be activated, but the operation is irreversible and the connection must be cutoff if poor quality is found
Solution Approach 1:
The patent employs a dynamic cam mechanism that can be rotated between different positions to control the retention elements. The cam can be rotated to an activated position for termination, a deactivated position for fiber removal, and intermediate positions for adjustment. This dynamic system allows the connector to transition between different operational states, enabling both easy termination and easy repair without irreversible damage.
Solution Approach 2:
The patent changes the operational parameter from irreversible crimping force to reversible rotational position. By using cam rotation angle as the control parameter, the system can be easily adjusted between activated and deactivated states. This parameter change enables the connector to be re-terminated by simply rotating the cam back to the deactivated position, removing the fiber, and re-activating when needed.
3Volume of moving object
If the connector is made small for field portability, then it is easier to transport, but it becomes difficult to terminate in the field
Solution Approach 1:
The patent uses a cam mechanism that converts rotational motion into linear actuation, allowing for compact design. The cam profile enables the small connector to achieve full actuation range through a limited rotation angle, making it easy to operate with one hand in field conditions while maintaining a compact form factor suitable for portable applications.
4Ease of operation
If the cam is exposed during use, then activation is easy, but the connector can be accidentally de-activated
Solution Approach 1:
The patent segments the cam activation function from the general connector operation. The cam is integrated into the fiber retention mechanism rather than being a separate exposed component. This segmentation allows the cam to be actuated only through the specific motion required for fiber retention, preventing accidental de-activation through unrelated connector movements while maintaining ease of intentional activation.
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
Enables rapid, positive, and reversible termination of fiber-optic cables in the field, reducing the risk of damage and allowing for easy re-termination without the need for expensive equipment, thus improving efficiency and reducing waste.
Implementation Method 1
a compression spring positioned within the bayonet and in engagement with the cam to bias the bayonet toward the receptacle
Implementation Method 2
an optically-transparent cam positioned within the backbone and having a cam profile configured to actuate the fiber retention planks in response to rotation of the cam
Data Source
AI summary
A re-terminable, no-crimp ST-type optical connector assembly includes a spring-loaded ferrule holder assembly and a reusable activation system for termination of the assembly. The optical connector can be terminated by a suitable cam activation tool. The connector includes a housing, such as a bayonet, matable to a mating adapter, a backbone retained within a rear of the housing, a ferrule holder provided within the backbone, and a cam provided between the ferrule holder and the backbone. The ferrule holder includes an alignment key exposed to mate with a cam activation tool to lock rotation of the ferrule holder relative to other connector components. The cam includes a cam activation cutout at a front face thereof that mates with a cam activation tool interface to enable rotation of the cam between de-activated and activated positions, the cam activation cutout also receiving the alignment key of the ferrule holder therethrough.