Method of multi-zone capacitive sensing, device and apparatus implementing the method
AssigneeQuickstep Technologies LLC
InventorsDidier Roziere, Eric Legros
Life of this patent
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Abstract
A method is provided for capacitive detection, implementing a plurality of electrodes capable of allowing the detection of objects in their proximity by capacitive coupling, and including a step of simultaneous polarization of at least a part of the electrodes with different excitation potentials, the excitation potentials being generated with respect to a reference potential such that the scalar product over a predetermined duration of at least two of these excitation potentials is zero or very much less than the scalar product of one and/or the other of these excitation potentials with itself over the predetermined duration. A device and an appliance implementing the method are also provided.
Claims19
A method for capacitive detection, implementing a plurality of electrodes capable of allowing the detection of one or more objects capacitively coupled to an earth potential and in proximity to the plurality of electrodes by capacitive coupling, the method comprising:
- locating a first group of the plurality of electrodes along a first zone of a device having a reference potential;
- locating a second group of the plurality of electrodes along a second zone of the device;
- polarizing the second group of electrodes on the second zone at a second excitation potential generated by second floating electronics referenced to a second voltage source referenced to the reference potential;
- and
- simultaneously polarizing the first group of electrodes on the first zone at a first excitation potential generated by first floating electronics referenced to a first voltage source referenced to the reference potential wherein a scalar product over a predetermined duration of the first and second excitation potentials is zero.
A device for capacitive detection having a reference potential, comprising:
- a plurality of electrodes capable of allowing the detection of one or more objects capacitively coupled to an earth potential and in proximity to the plurality of electrodes by capacitive coupling;
- at least a first zone and a second zone located on the device, the plurality of electrodes formed along at least the first and second zones, a second group of the plurality of said electrodes on the second zone configured for being polarized at a second excitation potential generated by second floating electronics referenced to a second voltage source referenced to the reference potential;
- and
- a plurality of voltage sources capable of simultaneously polarizing a first group of the plurality of said electrodes on the first zone at a first excitation potential generated by first floating electronics referenced to a first voltage source referenced to the reference potential while polarizing the second group of electrodes at the second excitation potential wherein a scalar product over a predetermined duration of the first excitation potential and the second excitation potential is zero.
An appliance comprising:
- a device for capacitive detection having a reference potential, wherein the device comprises:
- a plurality of electrodes capable of allowing the detection of one or more objects capacitively coupled to an earth potential and in proximity to the plurality of electrodes by capacitive coupling;
- at least a first zone and a second zone located on the device, the plurality of electrodes formed along at least the first and second zones, a second group of the plurality of said electrodes on the second zone configured for being polarized at a second excitation potential generated by second floating electronics referenced to a second voltage source referenced to the reference potential;
- and
- a plurality of voltage sources capable of simultaneously polarizing a first group of the plurality of said electrodes on the first zone at a first excitation potential generated by first floating electronics referenced to a first voltage source referenced to the reference potential while polarizing the second group of electrodes at the second excitation potential wherein a scalar product over a predetermined duration of the first excitation potential and the second excitation potential is zero.
Dependencies are inferred from the claim text.