Folded Touch Sensor Tail Structure for Low-Resistance Mounting
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Solution Overview
Problem
The firmness of resin films used in touch sensors makes it difficult to incorporate them into electronic devices without degrading workability and increasing wire resistance, which can lower detection accuracy.
Innovation Solution
A touch sensor design featuring a sensor sheet with a protective layer in the folded portion to reduce pressure and heat influence on wires, allowing for easier incorporation and maintaining low resistance values, along with a radial widened portion to reduce noise and air bubble interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the resin film is forcibly bent to incorporate the touch sensor into the electronic device, then the touch sensor can be mounted, but the workability is degraded and the resistance value at the wire portion increases
Solution Approach 1:
The sensor sheet is divided into two distinct portions: an electrode formation portion and an edge portion. The edge portion is pre-bent along a folding line to form a folded portion, while the electrode formation portion remains planar. This segmentation allows the edge portion to be easily incorporated into the electronic device without forcing the entire sensor sheet, thereby maintaining workability and preventing resistance increase in the wires.
Solution Approach 2:
The edge portion of the sensor sheet is pre-bent to form a folded portion before incorporation into the electronic device. This preliminary action of bending the edge portion separately from the electrode formation portion enables easier mounting while preventing the wires from being subjected to excessive bending stress that would increase their resistance and degrade detection accuracy.
2Ease of manufacture
If the resin film is bent to fit the touch sensor into the device, then mounting is achieved, but the firmness of the resin film causes difficulty in incorporation
Solution Approach 1:
The sensor sheet is segmented into an electrode formation portion and an edge portion, allowing the edge portion to be bent independently. This segmentation enables the flexible bending of the edge portion for easy incorporation while maintaining the structural integrity and firmness of the electrode formation portion made of resin film.
Solution Approach 2:
The edge portion of the sensor sheet is designed as a flexible thin film structure that can be bent along a folding line to form a folded portion. This flexible design allows the edge portion to be easily incorporated into the electronic device housing without requiring the entire sensor sheet to be forcibly bent, thereby improving incorporation ease while maintaining the firmness of the main sensor structure.
Data Source
AI summary
A touch sensor includes a sensor sheet that includes a plurality of sensor electrodes, wires that extend from the sensor electrodes, and a connection portion for connection to a substrate. The sensor sheet is formed with a body portion in which the sensor electrodes are formed, and a tail portion that projects from the body portion and that includes a terminal. A protective layer is stacked on at least a part of the tail portion. A folded portion in which the sensor sheet has been bent permanently is formed in the tail portion on which the protective layer is stacked.