Coaxial Cable Plug Grounding Structure for Stable Contact Length
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Solution Overview
Problem
The existing plug design for coaxial cables, as disclosed in JP 59-65489UM-A, has a shortened contact length due to an annular opening in the recess, leading to increased stress and decreased elasticity limits, compromising stable contact performance.
Innovation Solution
The plug design includes a conductive terminal member with a cylindrical connecting section, an insulating holder, a conductive shell, and a grounding member with circular arc-shaped supports and elastically deformable contacts, featuring a protrusion that fits into a recess to increase contact length and reduce stress at the contact ends, while also incorporating a housing with a packing system to seal against dust and water intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an annular opening is provided in the recess to allow grounding member insertion, then the grounding member can be installed, but the contact length is shortened and stress increases
Solution Approach 1:
The recess is divided into two distinct sections: an upper insertion portion with a larger inner diameter that allows easy grounding member installation, and a lower contact portion with a smaller inner diameter that provides sufficient contact length. This segmentation resolves the contradiction by allowing the grounding member to be installed through the larger opening while maintaining adequate contact length in the lower portion where the contact actually occurs.
Solution Approach 2:
Different sections of the recess are given different diameters to serve different functions. The upper section has a larger diameter for installation accessibility, while the lower section has a smaller diameter to ensure adequate contact length and reduce stress. This local differentiation allows each section to optimize for its specific purpose.
2Length of stationary object
If the recess length is shortened to accommodate the annular opening, then the overall plug size is reduced, but the contact length decreases and elasticity limit decreases
Solution Approach 1:
The recess is segmented into an upper insertion portion and a lower contact portion with different diameters. This allows the overall recess length to be optimized for compact plug size while ensuring the lower contact portion maintains sufficient length for adequate contact performance and elasticity.
Solution Approach 2:
The recess has non-uniform diameter along its length, with the lower contact portion having a smaller diameter than the upper insertion portion. This local quality differentiation allows the contact portion to maintain adequate length for reliability while the overall structure remains compact.
3Reliability
If the contact length is increased to reduce stress, then contact performance stability improves, but the recess length must be increased
Solution Approach 1:
By segmenting the recess into different diameter sections, the lower contact portion can be optimized for adequate contact length to reduce stress and improve reliability, while the upper portion provides installation access without requiring excessive overall length.
Solution Approach 2:
Instead of uniformly increasing the recess length in one dimension, the solution uses dimensional variation in the radial direction (different diameters at different heights) to achieve the desired contact length while controlling overall size.
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 enhances stable contact performance over time by increasing contact length, reducing stress, and sealing against environmental contaminants, thereby ensuring reliable electrical connections.
Implementation Method 1
an elastically deformable contact supported by the pair of supports
Implementation Method 2
the grounding member is electrically connected to the body by the supports increasing in diameter due to elastic force and coming in contact with the inner peripheral surface of the recess
Data Source
AI summary
A plug includes a terminal member having a connecting section connected to an inner conductor of a coaxial cable, an insulating holder externally fitted to the terminal member, a conductive shell externally fitted to the holder, and a conductive grounding member disposed between the shell and the holder. The shell includes a cylindrical inner surface and a protrusion protruding from part of the cylindrical inner surface. The grounding member includes a pair of circular arc-shaped supports connected to the shell and a contact supported by the pair of supports. The pair of supports include a recess formed in a different place from where the contact is disposed. The grounding member is fixed to the shell by the protrusion fitting into the recess.