Sensor system for generating signals that are indicative of the position or change of position of limbs
First Claim
1. A sensor system for generating electrical signals indicating the position and/or the movement of limbs with respect to a reference area, the system comprising:
- a transmitter electrode,a voltage generator for applying an alternating voltage to the transmitter electrode and thereby creating an electric field around the transmitter electrode,a first receiver electrode in the field,a second receiver electrode in the field, anda detection circuit comprising high impedance inputs coupled with said first and second receiver electrode and being operable to detect a field-bridging effect caused by a hand or finger gesture and effective on the receiver electrodes, anda shielding electrode generally shielding the transmitter or the receiver electrode with respect to the detection circuit from the electric field, wherein a signal is fed to the shielding electrode which only differs in amplitude with respect to the alternating voltage applied to the transmitter electrode.
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Accused Products
Abstract
The invention relates to a sensor device for generating electronic signals which as such provide information on a position in space, and/or the movement of limbs, especially of the hand of a user in relation to the sensor device. Said electronic signals can be used to carry out input processes in data processing devices, communication devices and other electric devices. The aim of the invention is to devise ways of generating, in an especially advantageous manner, signals that are indicative of the position and/or the movement of limbs. A sensor device for generating electrical signals which as such provide information on the position or movement of limbs in relation to a reference area comprises a transmitter electrode device (G1, G1a, G1b), a voltage generator for supplying the transmitter electrode device (G1, G1a, G1b) with an alternating voltage of a first receiver electrode device, a second receiver electrode device, and a measurement circuit for detecting a field bridging effect towards the receiver electrode devices, said effect being correlated with a movement of the hand or the finger, a screening electrode device (S) at least substantially screening the transmitter electrode device (G1, G1a, G1b) and/or the receiver electrode device (M1, M2) from the measurement circuit with respect to field electrical effects.
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Citations
10 Claims
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1. A sensor system for generating electrical signals indicating the position and/or the movement of limbs with respect to a reference area, the system comprising:
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a transmitter electrode, a voltage generator for applying an alternating voltage to the transmitter electrode and thereby creating an electric field around the transmitter electrode, a first receiver electrode in the field, a second receiver electrode in the field, and a detection circuit comprising high impedance inputs coupled with said first and second receiver electrode and being operable to detect a field-bridging effect caused by a hand or finger gesture and effective on the receiver electrodes, and a shielding electrode generally shielding the transmitter or the receiver electrode with respect to the detection circuit from the electric field, wherein a signal is fed to the shielding electrode which only differs in amplitude with respect to the alternating voltage applied to the transmitter electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification