Duplex Twisted Shielded Cable Structure for Stable Foil Positioning
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Solution Overview
Problem
Existing duplex twisted shielded cables experience deterioration in transmission characteristics due to wrinkles and unstable positioning of the metal foil shield around insulated wires, leading to compromised signal transmission.
Innovation Solution
A duplex twisted shielded cable design featuring two insulated wires twisted together, with a spirally wound film and metal foil shield that overlaps, a metal braid on the outer periphery, and a sheath, where the film and metal foil shield are provided as separate members to prevent wrinkles and stabilize the shield's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal foil shield is wound around two insulated wires, then shielding effectiveness is improved, but wrinkles occur in the gap between wires and transmission characteristics deteriorate
Solution Approach 1:
The metal foil shield is divided into multiple segments that are wound separately around each insulated wire. This segmentation allows the shield to conform to the twisted pair structure without creating wrinkles in the gap between wires, thereby maintaining both shielding effectiveness and transmission characteristics.
Solution Approach 2:
The metal foil shield is wound in a spiral pattern around each wire rather than as a single continuous wrap around both wires. This dimensional change in the winding approach eliminates wrinkles by distributing the shield material evenly around each conductor, preventing contact issues in the inter-wire gap.
2Object-affected harmful factors
If a metal foil shield is wound around insulated wires, then electromagnetic shielding is improved, but the position of the shield becomes unstable
Solution Approach 1:
The shield is segmented into multiple sections, each wound around individual wires. This segmentation provides stable positioning by ensuring each segment is independently secured to its respective wire, preventing relative movement and maintaining consistent shield-to-conductor spacing.
3Object-affected harmful factors
If a continuous metal foil shield is used around twisted wires, then shielding performance is improved, but wrinkles occur causing transmission deterioration
Solution Approach 1:
The continuous metal foil shield is replaced with multiple discrete segments wound around each wire. This segmentation eliminates the wrinkle formation issue that occurs with continuous foils, as each segment can be independently positioned and secured without creating folds or wrinkles in the inter-wire gap.
Solution Approach 2:
The shielding approach transitions from a single continuous wrap to multiple spiral windings around individual conductors. This dimensional change in the shielding configuration prevents wrinkles by eliminating the need for the foil to span the gap between wires, where wrinkles would form.
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 effectively suppresses the deterioration of transmission characteristics by maintaining the stability of the metal foil shield's position and preventing wrinkles, ensuring consistent signal transmission across various frequency ranges and bending conditions.
Implementation Method 1
a film wound spirally on the two insulated wires such that parts of the film overlap each other; a metal foil shield wound spirally on the film such that parts of the metal foil shield overlap each other
Data Source
AI summary
There are provided a duplex twisted shielded cable and a wire harness, the duplex twisted shielded cable including: two insulated wires that are twisted together, each having a conductor and an insulator covering the conductor; a film wound spirally on the two insulated wires such that parts of the film overlap each other; a metal foil shield wound spirally on the film such that parts of the metal foil shield overlap each other; a metal braid provided on an outer periphery of the metal foil shield; and a sheath provided on an outer periphery of the metal braid. The film and the metal foil shield are provided as a separate member.