Textured Electrode Layout for Higher Electric Field Sensor Sensitivity
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Solution Overview
Problem
The sensitivity of electrodes in electric field measurement systems is low, particularly in systems using solid electrodes, which limits their effectiveness in detecting disturbances caused by objects entering the quasi-static electric field.
Innovation Solution
The electrode arrangement includes a nonconductive substrate with a first and second conductive layer, where the second electrode covers a larger area than the first and is textured to reduce capacitance between them, with options such as hash or hatch textures, grooves, or conductive lines forming a mesh, and the electrodes can be arranged with cut-outs or shielding to optimize signal sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrodes are used in the electric field measurement system, then the structural simplicity is maintained, but the sensitivity of the sensor system is low
Solution Approach 1:
The patent divides the solid electrode into multiple segments or layers, creating a multi-layer electrode structure. This segmentation allows the electrode to maintain structural simplicity while improving sensitivity by enabling better electric field distribution and object detection capability.
Solution Approach 2:
The patent employs composite electrode structures combining different conductive materials or configurations (such as conductive layers on substrates, mesh patterns, or layered arrangements). This composite approach enhances sensitivity by optimizing electric field penetration and interaction with detected objects while maintaining manageable structural complexity.
2Area of stationary object
If the second electrode covers a larger area than the first electrode, then the electric field coverage is improved, but the capacitance between the electrodes increases
Solution Approach 1:
The patent applies different properties to different regions of the electrode. The second electrode has a larger overall area for coverage but incorporates local variations such as textured surfaces, cut-out areas, or non-uniform thickness in specific regions. This allows maintaining large area coverage while locally reducing capacitance to preserve signal sensitivity.
Solution Approach 2:
The patent extracts or removes specific portions from the second electrode (cut-out areas) or applies textured surfaces that effectively reduce the continuous conductive area. This extraction approach allows the electrode to maintain a large footprint for coverage while reducing the actual capacitance-forming surface area, thereby preserving signal sensitivity.
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
This design significantly enhances the sensitivity of the electric field sensor system, allowing for better detection of objects, such as a user's hand, by minimizing capacitance between the transmitting and receiving electrodes, thereby improving signal detection and sensitivity.
Implementation Method 1
the first and/or second electrode is textured to reduce the capacitance between the first and second electrode
Implementation Method 2
an electrode is used as a transmitter to project an electric field outside or in front of a respective device. The field may be generated by a 30-200 kHz, in particular a 70-140 kHz or a 40-115 kHz, signal and thus is quasi-static in the near field
Data Source
AI summary
An electrode arrangement for an electric field sensor device with a transmitting electrode and at least one receiving electrode may have a nonconductive substrate having a first conductive layer and a second conductive layer. A first electrode is arranged within the first conductive layer, wherein the first electrode is a receiving electrode of the electric field sensor device, and a second electrode is arranged within the second conductive layer, wherein the second electrode is a transmitting electrode of the electric field sensor device wherein the second electrode covers a larger area than the first electrode and wherein the second electrode is textured to reduce the capacitance between the first and second electrode.