Edge Insulation Structure for Electrical Cable Shielding
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Solution Overview
Problem
Electrical cables face issues with electrical shorts and moisture penetration due to conductive materials at their edges, which can lead to signal interference and damage, especially as the number and speed of interconnected devices increase, requiring effective edge insulation to prevent such issues.
Innovation Solution
The implementation of edge insulation structures using dielectric materials and adhesive layers to create non-conductive edges on electrical cables, which can be applied during cable construction or later, utilizing materials like UV curable compounds, thermoset materials, and conductive shielding films to ensure insulation and prevent shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive materials are used at cable edges for shielding, then electromagnetic shielding performance is improved, but electrical shorts and moisture penetration risk increase
Solution Approach 1:
The cable structure is segmented into distinct functional zones: conductive shielding layers are positioned in cover portions away from edges, while pinched portions at the edges are made non-conductive through the adhesive layer bonding shielding films together, creating electrical isolation at vulnerable edge regions
Solution Approach 2:
Different electrical properties are applied to different locations: the shielding films maintain conductive properties in cover portions for electromagnetic shielding, while the pinched portions at edges are rendered non-conductive through adhesive bonding to prevent shorts and moisture ingress, allowing each region to have optimized properties for its specific function
2Reliability
If edge insulation structures are added to prevent shorts, then cable reliability is improved, but device complexity increases
Solution Approach 1:
The adhesive layer serves multiple functions simultaneously: it bonds the first and second conductive shielding films together to create pinched portions, provides edge insulation to prevent shorts and moisture penetration, and maintains structural integrity, thereby combining insulation and bonding functions into a single integrated element
Solution Approach 2:
The pinched portions of the shielding films serve dual purposes: they provide the necessary adhesive bonding between shielding layers while simultaneously creating non-conductive edge regions that prevent electrical shorts and moisture ingress, eliminating the need for separate insulation components
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
The edge insulation structures effectively prevent electrical shorts and moisture ingress, maintaining signal integrity and cable durability by creating a robust, insulative edge that reduces interference and enhances the cable's mechanical strength.
Implementation Method 1
an adhesive layer bonds the first shielding film to the second shielding film in the pinched portions of the cable
Implementation Method 2
Each insulated conductor includes a central conductor surrounded by a dielectric material
Data Source
AI summary
A cable includes one or more conductor sets, one or more dielectric unitary blocks or reservoirs, first and second conductive shielding films disposed on opposite first and second sides of the conductor sets and the dielectric blocks or reservoirs, and an adhesive layer. The shielding films include cover portions and pinched portions arranged such that, in cross-section, the cover portions of the shielding films in combination substantially surround each conductor set and each unitary block or reservoir, and the pinched portions of the shielding films in combination form pinched portions of the cable on each side of the conductor set and on at least one side of the unitary block or the reservoir. The adhesive layer bonds the first shielding film to the second shielding film in the pinched portions of the cable.