Flexible Flat Cable With Adhesion Layer Crack Repair
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Solution Overview
Problem
Flexible flat cables used in vehicles often experience conductivity degradation due to cracks in conductors, especially in areas with high curvature and repetitive motion, leading to signal disruption and reduced lifespan.
Innovation Solution
Incorporating an adhesion layer with metal particles, such as nickel, cobalt, gold, or copper, that reconnects and restores conductivity by melting to fill cracks caused by increased resistance, using a first adhesion layer covering the conductors and a second layer bonding the insulating film, with a manufacturing process involving coating, washing, and applying heat and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the conductor is made thin and flexible to reduce cable volume and improve flexibility, then the cable achieves small volume and high flexibility, but the conductor becomes more susceptible to cracking under repetitive motion and curvature
Solution Approach 1:
Metal particles are pre-dispersed within the adhesion layer during manufacturing, positioned in advance to fill cracks before they occur. This preliminary placement allows the particles to immediately bridge conductor cracks when they form, preventing conductivity loss without requiring the conductor itself to be thicker or more rigid.
2Reliability
If the conductor is made thicker to prevent cracking and maintain conductivity, then conductor integrity is improved, but the cable volume increases and flexibility decreases
Solution Approach 1:
The adhesion layer serves as an intermediary between the conductor and insulating film, containing metal particles that act as mediators to bridge cracks in the conductor. This allows the conductor itself to remain thin and flexible while the metal particles provide the crack-bridging function that would otherwise require a thicker conductor.
3Ease of manufacture
If a standard adhesion layer is used to bond the insulating film to the conductor, then the bonding function is achieved, but the adhesion layer cannot restore conductivity when cracks occur in the conductor
Solution Approach 1:
The adhesion layer is designed to perform multiple functions: it provides mechanical bonding between the insulating film and conductor, and simultaneously contains metal particles that can bridge cracks to restore conductivity. This multi-functionality eliminates the need for separate bonding and crack-repair mechanisms, maintaining ease of manufacture while adding reliability.
4Ease of manufacture
If the cable structure is simplified to reduce manufacturing complexity, then manufacturing ease is improved, but the ability to restore conductivity after cracking is reduced
Solution Approach 1:
The crack-repair function is merged into the existing adhesion layer by dispersing metal particles within it during the coating process. This integration means the same layer that provides mechanical bonding also provides electrical repair capability, eliminating the need for additional separate structures or manufacturing steps while enhancing reliability.
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 solution effectively restores conductivity in cracked conductors, extending the lifespan of flexible flat cables by using metal particles that melt and reconnect at the crack sites, ensuring continuous signal transmission.
Implementation Method 1
When the crack occurs in the conductor the metal particles become molten in the area in which the crack occurs due to the heat generated from an increase in resistance
Data Source
AI summary
A flexible flat cable and a method of manufacturing the flexible flat cable, may include an insulating film forming an external appearance of the flexible flat cable; a conductor disposed inside the insulating film; and an adhesion layer configured to bond the insulating film to the conductor, wherein the adhesion layer contains metal particles, and when a crack occurs in the conductor, the metal particles connect the conductor in which the crack occurs.