Pressure Sensor Helical Electrodes Elliptical Cross-Section
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Solution Overview
Problem
Conventional pressure sensitive sensors face challenges when bent at a small radius, leading to improper actuation due to contact between electrode wires, especially in complex layouts.
Innovation Solution
A pressure sensitive sensor with a cylindrical shape body featuring a hollow portion formed in an elliptical shape in cross-section and electrode wires arranged helically, preventing contact between adjacent wires when bent, and utilizing a production method that eliminates the need for a spacer to enhance flexibility and reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pressure sensitive sensor is bent at a small radius to accommodate complex layouts, then the adaptability to complex installations is improved, but the electrode wires come into contact with each other causing improper actuation
Solution Approach 1:
The inner peripheral surface of the cylindrical body is formed with an asymmetric cross-sectional shape where portions between adjacent electrode wires are recessed inward relative to a circular reference. This asymmetric geometry creates additional clearance between electrode wires when bent, preventing contact while maintaining flexibility for complex layouts.
Solution Approach 2:
The solution moves from a conventional circular cross-section to a non-circular cross-section with radially inward recesses. This dimensional change in the cross-sectional geometry provides additional spatial separation between electrode wires without increasing the overall sensor diameter, enabling small bending radius installation while preventing wire contact.
2Ease of manufacture
If a conventional circular cross-section is used, then the manufacturing simplicity is improved, but the electrode wires contact each other when bent causing improper actuation
Solution Approach 1:
The inner peripheral surface is formed with an asymmetric cross-sectional shape where portions between adjacent electrode wires are recessed inward. This design maintains manufacturing feasibility while effectively preventing electrode wire contact during bending operations, resolving the contradiction between manufacturing simplicity and reliability.
3Reliability
If the inner peripheral surface is formed with recessed portions, then the clearance between electrode wires is increased preventing contact, but the manufacturing complexity increases
Solution Approach 1:
The recessed portions are strategically positioned only at specific locations on the inner peripheral surface where they provide maximum clearance between adjacent electrode wires. This localized modification achieves the reliability goal without requiring complex structural changes throughout the entire sensor body.
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 sensor effectively resists improper actuation when bent at a small radius and allows for longer, cost-effective production of pressure sensitive sensors without the use of spacers, improving manufacturing efficiency and reducing the risk of wire damage.
Implementation Method 1
a cylindrical shape elastic electrical insulating member including therein a hollow portion
Data Source
AI summary
A pressure sensitive sensor is composed of a cylindrical shape body including therein an inner peripheral surface and a hollow portion along a longitudinal direction of that cylindrical shape body, and being made of an elastic electrical insulating member, and a plurality of electrode wires arranged in a helical shape along the inner peripheral surface of the cylindrical shape body, and arranged in such a manner as to have no contact with each other. In the pressure sensitive sensor, in a cross-sectional view perpendicular to the longitudinal direction of the cylindrical shape body, at least some part of the inner peripheral surface of the cylindrical shape body lying between adjacent ones of the plurality of the electrode wires on the inner peripheral surface of the cylindrical shape body is formed in an inner side in radial directions of a circle passing through centers of the plurality of the electrode wires.