Shielded Flexible Flat Cable Connection Using a Relay Bus Bar
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Solution Overview
Problem
Conventional methods for connecting flexible flat cables fail to provide effective electromagnetic shielding for the connection member when connecting cables with shielded conductive paths, as the connection member is not enclosed by the shield layer.
Innovation Solution
A structure that includes a flexible flat trunk cable with a signal trunk conductor, ground trunk conductor, trunk shield, and insulating coating, a flexible flat branch cable with a signal branch conductor, ground branch conductor, branch shield, and insulating coating, and a relay bus bar with a shielding member that encloses the relay bus bar to ensure electromagnetic shielding during connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a connection member is inserted in a state in which a plurality of flexible flat cables are vertically placed on each other, then the connection method is simple and easy to implement, but the connection member cannot be electromagnetically shielded because it is not enclosed by the shield layer
Solution Approach 1:
The relay bus bar is nested inside the shielding member, which is itself nested within the shield layers of the flexible flat cables. This nested structure ensures that the connection member (relay bus bar) is enclosed by the shield layer, providing electromagnetic shielding while maintaining the simplicity of the vertical insertion connection method.
Solution Approach 2:
The shielding member acts as an intermediary structure between the relay bus bar and the external environment. It encloses the relay bus bar and connects to the shield layers of the cables, serving as a mediator that transfers electromagnetic shielding protection to the connection member without complicating the connection process.
2Object-affected harmful factors
If a shield layer is added to enclose the conductive path for electromagnetic shielding, then the shield performance is improved, but the connection member remains exposed and unprotected when cables are connected vertically
Solution Approach 1:
The shielding member is nested within the cable shield layers, creating a continuous nested shielding structure. This ensures that the relay bus bar is protected by multiple layers of shielding (cable shields plus shielding member), achieving complete electromagnetic shielding coverage for the connection region.
Solution Approach 2:
The shielding member merges the shielding functions of multiple cable shield layers into a unified protective structure. By connecting the shielding member to the shield layers of both cables, it combines their shielding capabilities to provide comprehensive electromagnetic protection for the relay bus bar.
3Object-affected harmful factors
If the relay bus bar is enclosed by a shielding member, then electromagnetic shielding is achieved, but the structural complexity increases
Solution Approach 1:
The shielding member is designed as a thin-walled structure that flexibly encloses the relay bus bar. This thin-film approach provides effective electromagnetic shielding while minimizing the added structural complexity and maintaining flexibility for vertical insertion connection.
Solution Approach 2:
The shielding member serves multiple functions: it encloses the relay bus bar for electromagnetic shielding, provides mechanical support during connection, and connects to the cable shield layers for continuity. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural complexity.
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 configuration allows for reliable electromagnetic shielding of the relay bus bar, improving the shield performance and enabling the secure connection of signal trunk and branch conductors while preventing electromagnetic interference.
Implementation Method 1
a trunk shield that is electrically connected to the ground trunk conductor and encloses the signal trunk conductor to magnetically shield the signal trunk conductor
Implementation Method 2
a branch shield that is electrically connected to the ground branch conductor and encloses the signal branch conductor to electromagnetically shield the signal branch conductor
Implementation Method 3
a shielding member for enclosing the relay bus bar to electromagnetically shield the relay bus bar
Data Source
AI summary
A trunk cable 12 includes a signal trunk conductor 31 that is electromagnetically shielded by a shield layer 35. A branch cable 13 includes a signal branch conductor 38 that is electromagnetically shielded by a shield layer 42. The signal trunk conductor 31 and the signal branch conductor 38 are electrically connected to each other by a relay bus bar 64 that is electromagnetically shielded by a base shielding member 65 and a cover shielding member 27.