Flexible Capacitive Sensor for Curved Surface Approach Detection
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Solution Overview
Problem
Existing capacitive sensors for planar recognition of object approach are rigid and inflexible, limiting their adaptability to non-planar surfaces and increasing the complexity and cost of installation.
Innovation Solution
A capacitive sensor design featuring limp, torsion-flexible electrodes and a dielectric layer, allowing it to be applied on non-planar surfaces and detect object approach without physical contact, using textile layers and flexible electronics for enhanced durability and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rigid capacitive sensors are used for planar recognition, then measurement precision is maintained, but adaptability to non-planar surfaces deteriorates
Solution Approach 1:
The patent applies flexible thin film electrodes and dielectric layers to create a capacitive sensor that can conform to non-planar surfaces. The flexible substrate and thin film structure allow the sensor to adapt to curved surfaces while maintaining its capacitive sensing function, directly resolving the contradiction between adaptability and structural rigidity.
Solution Approach 2:
The sensor design incorporates flexible components that can dynamically adapt to different surface geometries. The flexible electrodes and dielectric layers can deform to match the contour of non-planar surfaces, enabling the sensor to maintain measurement precision across varying surface shapes while preserving structural integrity.
2Adaptability or versatility
If flexible materials are used to enable bending, then adaptability to curved surfaces is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent employs composite material structures combining flexible substrates with conductive layers and dielectric films. This composite approach allows the sensor to achieve both flexibility for curved surface installation and sufficient manufacturing precision, as each layer can be optimized for its specific function while maintaining overall signal integrity.
Solution Approach 2:
The flexible electrode design allows for parameter changes in terms of geometric adaptation to curved surfaces. The sensor can change its physical configuration to match different surface curvatures while maintaining electrical performance through careful design of the flexible circuit patterns and electrode geometries.
3Area of stationary object
If multiple rigid sensors are installed to cover curved surfaces, then detection coverage is improved, but device complexity increases
Solution Approach 1:
The flexible capacitive sensor serves multiple functions: it can be installed on planar and non-planar surfaces, provides wide-area detection coverage, and maintains signal integrity across curved surfaces. This multi-functionality replaces the need for multiple specialized rigid sensors, reducing device complexity while expanding detection coverage.
Solution Approach 2:
The patent transitions from a planar two-dimensional sensor configuration to a three-dimensional flexible structure that can conform to curved surfaces. This dimensional adaptation allows a single sensor to cover areas that would otherwise require multiple rigid sensors, simplifying the overall device architecture while maintaining comprehensive detection coverage.
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 can be easily installed on curved surfaces, providing robust and reliable detection of object approach with reduced material costs and improved signal quality, while maintaining flexibility and adaptability.
Implementation Method 1
The partial electrodes of the second electrode form at least one electrical capacitance... If the capacitance is charged and an object approaches, the field of the capacitance of the partial electrodes is disturbed... so that a change of the value of the capacitance is measurable and the approach is detected.
Implementation Method 2
The field lines of the capacitance extend in the space between the particular partial electrodes, the field lines preferably extending at least partially in the surroundings of the capacitive sensor... air of the surroundings forms a dielectric of the electrical capacitance formed by the partial electrodes.
Data Source
AI summary
A capacitive sensor for a planar recognition of an approach of an object. The capacitive sensor includes a first planar electrode and a second planar electrode, a dielectric being situated between the first electrode and second electrode for spacing. The first electrode and the second electrode being designed to be limp and/or torsion flexible.