Proximity Sensor Electrode Layout for Sensitive Non-Contact Detection
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Solution Overview
Problem
Non-contact sensing technologies face challenges in accurately detecting targets without contact due to small changes in capacitance and interference from user hands or fingers, leading to decreased sensing sensitivity.
Innovation Solution
A proximity sensor system with a configuration of first, second, and third electrodes, where the second electrode has a larger area than the first, and the third electrode is closer, allowing for improved detection sensitivity by manipulating electric field strength and area to enhance capacitive sensing without contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional proximity sensor with equal area electrodes is used, then the device structure is simple, but the sensing sensitivity is low due to small capacitance changes
Solution Approach 1:
The patent applies asymmetry by configuring the second electrode with a larger area than the first electrode. This asymmetric electrode area ratio creates an optimized electric field distribution that enhances the capacitance change signal when a target approaches, thereby improving sensing sensitivity without requiring complex additional components
Solution Approach 2:
The patent implements local quality by positioning the third electrode closer to the first electrode than to the second electrode. This creates localized regions of different electric field strength, with the stronger field near the first electrode enhancing the detection of capacitance changes while maintaining overall system simplicity
2Measurement precision
If the electrode area is increased to improve detection sensitivity, then the sensing range is improved, but the interference from user hands or fingers increases
Solution Approach 1:
The patent applies local quality by creating distinct electric field regions through the asymmetric electrode configuration. The third electrode is positioned closer to the first electrode, generating a localized strong electric field for sensitive detection, while the larger second electrode provides a broader, more stable reference field that is less susceptible to interference from user hands or fingers
Solution Approach 2:
The patent segments the sensing function into three separate electrodes with different configurations and functions. The first electrode (smaller area) provides focused local detection, the second electrode (larger area) provides stable reference and broader coverage, and the third electrode (closer to first) enhances the detection field, allowing the system to achieve high sensitivity while rejecting interference through differential measurement
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 system enables accurate detection of targets without contact, improving sensitivity and reducing noise interference, allowing for precise touch detection and non-contact operation in display devices.
Implementation Method 1
non-contact sensing technologies face challenges in accurately detecting targets without contact due to small changes in capacitance
Implementation Method 2
allowing for improved detection sensitivity by manipulating electric field strength and area to enhance capacitive sensing without contact
Data Source
AI summary
A proximity sensor is arranged with a first electrode input with a first signal, a second electrode input with a second signal different from the first signal, a third electrode arranged closer to the first electrode than the second electrode, and the second signal has a reverse phase of the first signal.