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Patent

Driven shielding capacitive proximity sensor

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TLDR
In this article, a capacitive proximity sensing element, backed by a reflector driven at the same voltage as and in phase with the sensor, is used to reflect the field lines away from a grounded robot arm towards an intruding object, thus dramatically increasing the sensor's range and sensitivity.
Abstract
A capacitive proximity sensing element, backed by a reflector driven at the same voltage as and in phase with the sensor, is used to reflect the field lines away from a grounded robot arm towards an intruding object, thus dramatically increasing the sensor's range and sensitivity.

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References
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Electronic warning and monitoring apparatus and electrode arrangement therefor

TL;DR: In this article, the authors propose a monitoring and warning apparatus for automatic processing apparatuses, in particular robots, where Reactance-determining elements are arranged as sensors on the movable parts of the robot and if the robot arm approaches an object, detuning of the sensor circuit occurs.
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Capacitive path sensor with oscillator - has screening electrode between capacitor active and earthing electrodes, at same potential as active electrode

TL;DR: In this paper, a path sensor system has an oscillator, a transmit and reception capacitance, a demodulator and a switching amplifier, with the oscillator comprising an externally influence capacitor (5) with an active electrode (6) and an earthing electrode (7).
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Capacitive proximity detector

Jiri Marek
TL;DR: In this article, a capteur capacitif de proximite comprend deux electrodes mutuellement isolees electriquement connectees a un generateur de signaux and don au moins une est plate.
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Touch actuated electronic switch

TL;DR: In this paper, an electronic switch which has no moving parts and is actuated by the capacitance of an operator providing a connection between earth ground and an input to the electronics associated with the switch is disclosed.
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Automatic control using proximity sensors

TL;DR: In this paper, the difference in signal strength between the two antenna strips exceeds a threshold level and is used to determine the position of the object on one side or another of the antenna strips, where a bootstrap electrode is positioned behind a single antenna strip and is electrically connected to follow the voltage induced on the antenna strip by the received signal.