Composite Flexible Circuit Planar Cable with Jumping Lines
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Solution Overview
Problem
Conventional flexible flat cables generate electromagnetic interference and static electricity, and are costly due to the need for metal shielding and high-frequency impedance control, making them unsuitable for replacing conventional flexible circuit boards in cost-sensitive applications, especially when extending through small holes or hinges.
Innovation Solution
A composite flexible circuit planar cable combining a standard flexible flat cable with a conventionally etched circuit board, featuring multiple slits for bundle-like structures and jumping lines for wire interconnection, allowing easy extension through small holes and improved electromagnetic shielding and grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard flexible flat cable is used to reduce manufacturing cost, then manufacturing cost is reduced, but electromagnetic noise shielding capability deteriorates
Solution Approach 1:
The patent combines a flexible flat cable with a circuit board to create a composite structure. The circuit board portion includes a grounding pattern that provides electromagnetic noise shielding while maintaining the cost benefits of using a flexible flat cable for signal transmission. This merging allows the system to achieve both cost reduction and electromagnetic shielding capability.
Solution Approach 2:
The invention uses a composite structure consisting of a flexible flat cable and a circuit board with grounding patterns. This composite design integrates the cost-effective flexible flat cable with the electromagnetic shielding properties of the circuit board's grounding system, achieving both economic and technical benefits.
2Device complexity
If a flexible flat cable is used to simplify internal component design, then device complexity is reduced, but signal integrity deteriorates due to high frequency electromagnetic waves
Solution Approach 1:
The patent merges the flexible flat cable with a circuit board that includes grounding patterns. This combination maintains the simplicity of using a flexible flat cable while adding the signal integrity protection of a grounded circuit board structure, thereby preserving both device simplicity and signal reliability.
Solution Approach 2:
The circuit board with grounding patterns acts as an intermediary between the flexible flat cable and the electromagnetic environment. It mediates the signal transmission by providing a controlled impedance path and shielding, ensuring signal integrity while allowing the flexible flat cable to maintain its simple structure.
3Object-affected harmful factors
If a metal shielding layer is coated on the flexible circuit board to shield external electromagnetic noises, then electromagnetic noise shielding is improved, but grounding effectiveness deteriorates
Solution Approach 1:
The patent extracts the shielding function from a separate metal coating and integrates it into the circuit board's grounding pattern design. The grounding pattern itself provides the shielding effect, eliminating the need for additional metal shielding layers and ensuring effective grounding through the existing ground connections.
Solution Approach 2:
The circuit board's grounding pattern serves dual purposes: it provides electromagnetic noise shielding and maintains effective grounding simultaneously. The grounding system is self-sufficient, using its own structure to provide both shielding and grounding functions without requiring separate components.
4Adaptability or versatility
If the flexible flat cable is extended through a small hole or hinge bore to enable movement, then adaptability is improved, but bending durability deteriorates
Solution Approach 1:
The patent segments the flexible flat cable into multiple sections with slits, creating a bundle-like structure. This segmentation allows the cable to flex and bend more easily when extended through small holes or hinge bores, improving adaptability while distributing mechanical stress to maintain durability through tens of thousands of bending cycles.
Solution Approach 2:
The flexible flat cable uses a thin, flexible structure with slits that allows it to pass through small holes and hinge bores. The flexible design with multiple slits enables the cable to accommodate repeated bending movements while maintaining structural integrity and durability.
Data Source
AI summary
A composite flexible circuit planar cable includes a flat cable, a first section, and a second section. The flat cable includes a plurality of straight line like parallel and non-jumping conductor lines. At least one jumping line is formed on the first section to interchangeably connect a selected conductive line of the first section to an another selected conductive line. The second section may also form at least one jumping line to interchangeably connect a selected conductive line of the second section to an another selected conductive line. Through such a jumping line, electrical connection can be formed between signal terminals and corresponding and interchanged signal terminals. The plurality of conductor lines of the flat cable includes at least a pair of differential signal conductor lines, a grounding line, and a power line.