Shield Connector Attachment Structure for Direct Mounting
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Solution Overview
Problem
The existing shield connector designs for direct mounting on a device require strong contact pressure to stabilize the shield circuit, making the attachment process inefficient due to high insertion forces, especially when the connector housing is inserted through a casing opening.
Innovation Solution
The attachment structure includes a non-conductive connector housing with a terminal housing portion and a metal shield shell, where the opening has a diameter-enlarged portion and a contact piece with a tapered surface that contacts the enlarged portion only during bolt fastening, reducing the initial insertion force and enhancing the wedge effect for stable contact pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact piece provides strong elastic force to stabilize the shield circuit, then the shielding reliability is improved, but the insertion force becomes too strong reducing work efficiency
Solution Approach 1:
The contact piece is divided into two functional sections: a first contact section with a tapered surface for initial insertion, and a second contact section for final electrical contact. This segmentation allows the insertion process to be separated into low-force entry and high-force contact establishment phases.
Solution Approach 2:
The tapered surface on the first contact section performs the preliminary action of guiding and facilitating easy insertion into the diameter-enlarged opening. Only after this preliminary insertion is complete does the contact piece engage the second contact section to establish the electrical connection, separating the insertion difficulty from the contact pressure requirement.
2Reliability
If the contact piece is in elastic press-contact with the opening to stabilize the shield circuit, then the electrical connection reliability is improved, but the insertion force required increases making attachment difficult
Solution Approach 1:
Different sections of the contact piece are given different local qualities: the first contact section has a tapered surface geometry optimized for easy insertion, while the second contact section has properties optimized for stable electrical contact. The diameter-enlarged opening also has localized quality changes to accommodate these different functions at different positions.
3Reliability
If strong contact pressure is applied to stabilize the shield circuit, then the shielding effect reliability is improved, but the insertion work becomes difficult
Solution Approach 1:
The contact piece transitions dynamically during insertion: initially engaging with the tapered surface for easy entry, then progressively engaging the second contact section as insertion proceeds. This dynamic engagement sequence allows the system to achieve strong contact pressure for reliable shielding without requiring high insertion force from the beginning.
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 design reduces the insertion force required for attaching the shield connector, increases the efficiency of the insertion process, and provides a stable shielding effect without the need for additional rotation prevention mechanisms.
Implementation Method 1
the contact piece having springiness is pressed against the outer surface of the casing
Implementation Method 2
provides a stable shielding effect without the need for additional rotation prevention mechanisms
Data Source
AI summary
An attachment structure for directly attaching a shield connector to an opening formed in a metal casing is provided. A shield connector for directly mounting on a device is attached to an opening formed in a metal casing. A connector housing is fastened to the casing with bolts from outside the casing. The opening of the metal casing has a diameter-enlarged portion formed in an end portion of the opening in an outside direction of the casing to be enlarged toward the outside direction. The shield shell has a contact piece at an end portion of the shield shell, and the contact piece is housed in and contacts with the diameter-enlarged portion in a state that the shield connector is attached to the opening.