Flexible Cable Capacitor Design for Mobile Terminals
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Solution Overview
Problem
Conventional flexible thin-film capacitors have limited flexibility and complex production processes, making it difficult to create capacitors with high capacitance and suitable for connecting multiple circuit boards in mobile terminals.
Innovation Solution
A flexible cable with a simple structure featuring an elongated flexible substrate and capacitor electrodes on opposite surfaces, allowing for easy production and high flexibility, with the ability to increase capacitance by adjusting the substrate's length and width, and connectors for connecting circuit boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible thin-film capacitor with stacked electrode films and dielectric layers is used, then capacitance can be achieved, but flexibility is reduced and production process becomes complicated
Solution Approach 1:
The capacitor structure is segmented into two separate capacitor electrodes on opposite surfaces of the flexible substrate, eliminating the need for multiple stacked layers. This segmentation simplifies the production process while maintaining capacitance functionality through the parallel plate configuration formed by the two electrodes facing each other across the substrate thickness.
Solution Approach 2:
The invention transitions from a vertical stacking arrangement (multiple layers in the thickness direction) to a planar arrangement (two electrodes on opposite surfaces extending in the surface plane). This dimensional change allows the capacitor to achieve sufficient capacitance through increased electrode area while maintaining flexibility and simplifying manufacturing.
2Reliability
If electrode films and dielectric layers are stacked on one another, then capacitance can be formed, but flexibility is not necessarily high
Solution Approach 1:
The capacitor structure is divided into two separate capacitor electrodes positioned on opposite surfaces of the flexible substrate, eliminating the need for multiple stacked layers. This segmentation maintains flexibility by avoiding rigid interlayer connections while preserving capacitance through the parallel plate configuration.
Solution Approach 2:
The design shifts from vertical stacking to a planar configuration where two electrodes on opposite surfaces face each other. This dimensional transition preserves substrate flexibility while achieving sufficient capacitance through increased electrode area in the planar direction rather than through multiple thin layers.
3Volume of moving object
If the distance between terminals is short, then the structure is compact, but it is difficult to form a capacitor having great capacitance
Solution Approach 1:
The invention resolves the capacitance-distance contradiction by transitioning from a vertical stacking approach to a planar configuration. Capacitance is increased through expanded electrode area in the surface plane rather than through reduced terminal distance, allowing great capacitance values while maintaining compact overall dimensions.
Solution Approach 2:
The flexible substrate serves dual functions as both the structural base and the dielectric medium between the two capacitor electrodes. This merging of functions eliminates the need for separate dielectric layers and terminal connections, achieving great capacitance through the combined area of the two large electrodes on opposite surfaces while maintaining short effective distance through the substrate thickness.
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 flexible cable achieves high flexibility and ease of production while providing a capacitor element with increased capacitance, effectively connecting circuit boards in electronic devices like mobile terminals.
Implementation Method 1
a first capacitor electrode provided on the first surface of the flexible substrate, the first capacitor electrode extending from a first end of the flexible substrate toward a second end of the flexible substrate; a second capacitor electrode provided on the second surface of the flexible substrate
Data Source
AI summary
A flexible cable includes an elongated flexible substrate including first and second surfaces on opposite sides thereof, a first capacitor electrode provided on the first surface side of the flexible substrate, the first capacitor electrode extending from a first end of the flexible substrate toward a second end of the flexible substrate, a second capacitor electrode provided on the second surface side of the flexible substrate, the second capacitor electrode extending from the second end of the flexible substrate toward the first end of the flexible substrate, a first connection portion provided at an end of the first capacitor electrode located at the first end of the flexible substrate, and a second connection portion provided at an end of the second capacitor electrode located at the second end of the flexible substrate.