Optical-Electrical Composite Cable Bending Stress Protection
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Solution Overview
Problem
Optical-electrical composite cables integrated with flexible flat wiring boards and optical fibers face issues with bending stress, leading to damage or deformation, and the increased width due to separate power lines and signal lines, which affects the appearance and functionality of slim panel-shaped electrical equipment.
Innovation Solution
The optical-electrical composite cable integrates an optical fiber between two laminated flexible flat wiring boards, with a covering member to protect the fiber from bending stress and maintain a thin profile, allowing for high-speed signal transmission without increasing the cable's width, and includes power lines within the boards to manage current efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an optical fiber is integrated into a flexible flat wiring board to transmit high-speed signals, then signal transmission speed is improved, but the cable becomes susceptible to bending stress and the optical fiber may be damaged or deformed
Solution Approach 1:
The optical fiber is nested within a groove formed in the flexible flat wiring board, providing mechanical protection while maintaining integration. The groove structure allows the optical fiber to be embedded and secured, reducing exposure to bending stress and external damage while preserving high-speed signal transmission capabilities
Solution Approach 2:
A covering member is introduced as an intermediary element to protect the optical fiber integrated into the flexible flat wiring board. This covering member shields the optical fiber from bending stress and external forces, ensuring reliability while maintaining the high-speed signal transmission function
2Adaptability or versatility
If separate power lines and signal lines are integrated into the flexible flat wiring board, then functionality is improved, but the cable width increases affecting appearance and installation
Solution Approach 1:
Power lines and signal lines are arranged in different layers or dimensions within the flexible flat wiring board structure. This multi-layer arrangement allows multiple functions to be integrated without increasing the overall width, maintaining a slim profile while providing both power delivery and high-speed signal transmission capabilities
Solution Approach 2:
Different regions of the flexible flat wiring board are optimized for different functions - signal transmission lines are placed in specific areas for optimal electrical performance, while power lines are positioned in other regions. This localized optimization allows efficient integration of multiple functions without requiring uniform expansion of cable width
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 solution prevents optical fiber deformation, maintains a slim profile, and integrates signal and power lines effectively, enhancing the cable's durability and aesthetic appeal while supporting high-speed signal transmission and power delivery to slim panel-shaped equipment.
Implementation Method 1
an optical fiber to output an optical signal to be converted into a high-speed electrical signal to the electrical equipment
Data Source
AI summary
Provided is an optical-electrical composite cable in which, even if the entire optical-electrical composite cable having an optical fiber routed along flexible flat wiring boards is made thin, the optical fiber is not deformed or damaged by a large bending stress. A pair of the flexible flat wiring boards are disposed on a front surface side and a rear surface side of the optical fiber, and a covering member integrates the entirety thereof. Thus, even if the optical-electrical composite cable is made thin, the cable is not bent with a large curvature without deformation of the optical fiber.