In-line Hinged Dust Shutter for Fiber Optic Connectors
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Solution Overview
Problem
Fiber optic connectors face issues with debris and dust interference due to the small size of optical fibers, leading to potential damage and signal loss, and existing dust shutter solutions are often lost or not permanently integrated within the adapter system.
Innovation Solution
The design incorporates a dual or single hinged dust shutter plate system within the adapter, biased to close automatically when a connector is removed, forming a barrier to prevent debris ingress and reducing the risk of contact with the ferrule end face, with the option of a living hinge eliminating the need for separate springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate dust cap is used to protect the connector end face, then protection against debris is improved, but the dust cap may be lost or fall off during use
Solution Approach 1:
The dust shutter plate is integrated into the adapter housing as a permanent component rather than a separate removable cap. The hinged assembly is secured to the adapter housing wall, merging the dust protection function with the adapter structure itself, eliminating the risk of loss while maintaining protection capability
2Reliability
If a dust shutter plate is used to protect the ferrule end face, then protection against debris is improved, but the shutter plate may create debris when contacting the ferrule end face
Solution Approach 1:
Instead of the shutter plate contacting the ferrule end face directly, the design inverts the contact sequence by having the connector housing contact the shutter plate first, which then pivots open to allow the ferrule to pass through without contact. This prevents debris generation from direct contact between the shutter plate and ferrule end face
3Reliability
If a hinged dust shutter plate is used to form a barrier against debris, then protection effectiveness is improved, but the device complexity increases
Solution Approach 1:
The dust shutter plate is designed as a thin, flexible component that pivots on a hinge rather than a complex mechanical assembly. This flexible plate design achieves effective debris barrier functionality while minimizing structural complexity and material usage
4Reliability
If the dust shutter plate is biased closed with a spring, then automatic closing protection is improved, but the device complexity and component count increase
Solution Approach 1:
The connector insertion force itself serves to open the shutter plate, and the shutter plate's own weight and friction provide the closing force when the connector is removed. This self-service mechanism eliminates the need for separate springs or complex biasing mechanisms while maintaining automatic closing functionality
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 solution provides effective protection against debris, reduces the risk of damage to optical fibers, and maintains a clean environment for the ferrule end face, ensuring reliable optical connections and minimizing insertion loss.
Implementation Method 1
A separate spring biases closed each dust shutter plate
Implementation Method 2
each dust shutter plate on a hinged assembly secured to a wall or side of an adapter housing
Data Source
AI summary
An in-line dust shutter formed as part an adapter. A hinged dust shutter assembly is secured to an adapter wall. A shutter plate covers an opening formed at either end of the adapter to prevent debris from entering the adapter and distorting the light signal between opposing fiber optic connectors. The shutter plate extends at angle alpha from a rotational axis. The shutter plate is biased closed by a bias spring place about a pin of the rotational axis.