WO2022101417A1 - Configuration d'électrodes pour un agencement de commutateurs capacitifs - Google Patents

Configuration d'électrodes pour un agencement de commutateurs capacitifs Download PDF

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Publication number
WO2022101417A1
WO2022101417A1 PCT/EP2021/081540 EP2021081540W WO2022101417A1 WO 2022101417 A1 WO2022101417 A1 WO 2022101417A1 EP 2021081540 W EP2021081540 W EP 2021081540W WO 2022101417 A1 WO2022101417 A1 WO 2022101417A1
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WO
WIPO (PCT)
Prior art keywords
electrode
touch
electrodes
counter
touch electrodes
Prior art date
Application number
PCT/EP2021/081540
Other languages
German (de)
English (en)
Inventor
Michael Messner
Claus-Michael WEH
Tobias LEIBER
Original Assignee
Marquardt Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Marquardt Gmbh filed Critical Marquardt Gmbh
Publication of WO2022101417A1 publication Critical patent/WO2022101417A1/fr

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • H03K17/9622—Capacitive touch switches using a plurality of detectors, e.g. keyboard
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K2017/9602—Touch switches characterised by the type or shape of the sensing electrodes
    • H03K2017/9604—Touch switches characterised by the type or shape of the sensing electrodes characterised by the number of electrodes
    • H03K2017/9613—Touch switches characterised by the type or shape of the sensing electrodes characterised by the number of electrodes using two electrodes per touch switch
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960705—Safety of capacitive touch and proximity switches, e.g. increasing reliability, fail-safe
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960755—Constructional details of capacitive touch and proximity switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960755—Constructional details of capacitive touch and proximity switches
    • H03K2217/960775—Emitter-receiver or "fringe" type detection, i.e. one or more field emitting electrodes and corresponding one or more receiving electrodes

Definitions

  • the present invention relates to an electrode configuration for a capacitive switch arrangement and a capacitive switch arrangement which has such an electrode configuration with which a reliable electrical connection can be implemented in a simple manner even with complex touch surfaces.
  • Proximity switches such as capacitive switches
  • devices such as interior maps or overhead lights, sunroofs, and various other devices.
  • Capacitive switches typically employ one or more capacitive sensors to generate a sensing activation field and to detect changes in the activation field indicative of a user actuation of the switch or an actuator of the switch, typically caused by a User's finger in close proximity to or in contact with the sensor.
  • capacitive switches are generally designed to detect user actuations based on a comparison of a detected activation field with a threshold.
  • capacitive switches usually have electrodes laid out with circuitry formed on a substrate.
  • Document WO 2013/041520 A1 discloses an operating device, in particular for a vehicle component, which has a front wall with one or more fixed symbol fields on the front and a rear side with a capacitive proximity sensor system that has individual electrodes assigned to the symbol fields, wel - surface are arranged on the back of the front wall, and the back of the front wall facing the support plate, which is arranged at a distance from the front wall, has, wherein the capacitive proximity sensor for identifying that symbol field, which is an object, in particular a hand or the Finger of a hand approaches, having an evaluation unit connected to the electrodes.
  • Electrode carrier elements assigned to the individual symbol fields are arranged between the front wall and the carrier plate electrically connected contact field of the carrier plate is electrically contacted, the electrode end of each electrode carrier element having a protruding contact edge which extends at least partially around a symbol field assigned to the electrode carrier element and bears against the back of the front wall, the electrode running along the contact edge of the electrode denachelements is formed without being electrically connected to the front wall, and each electrode carrier element has an electrically conductive area for the electrical connection of its electrode with its contact end and thus the Has contact field of the support plate.
  • a touch-sensitive user interface which has a plurality of measuring surfaces, a measurement circuit that is coupled to the measuring surfaces and capable of generating output signals, the couplings between a pointing object and corresponding ones of the measurement areas, and a controller capable of receiving the output signals of the measurement circuit, determining from the output signals a combination of the measurement areas which are activated by the presence of the pointing object, to compare the combination of activated measuring areas with at least one predefined combination of the measuring areas, and a selected one of the measuring areas according to an agreement determining mood between the combination of activated sensing areas and one of the at least one predefined combination of sensing areas includes.
  • An electrode configuration for a capacitive sensor device is known from the publication DE 10 2011 003 734 B3, which comprises a transmitting electrode and a receiving electrode, wherein the transmitting electrode can be brought into a capacitive coupling with the receiving electrode, wherein the electrode configuration has at least one first sensor area and at least forms a second sensor area, the electrode areas of the transmitting electrode and the receiving electrode in the first sensor area being small in comparison to the electrode areas of the transmitting electrode and the receiving electrode in the second sensor area.
  • a device with a capacitive sensor containing electrodes and a control unit contains a processing unit and a memory, wherein when a logic is executed by the processing unit, the logic being able to select a first subset of electrodes for a measurement and to select one of the electrodes from a second subset of the electrodes as a reference drive electrode, the logic being further able to calculate a difference between a capacitance measurement the first subset and a capacitance measurement of the reference drive electrode, and wherein the logic is also operable to adjust the capacitance measurement of the first electrode based at least in part on the difference.
  • the object of embodiments of the invention is to specify an electrode configuration for a capacitive switch arrangement and a capacitive switch arrangement which has such an electrode configuration, with which a reliable electrically conductive connection can be implemented in a simple manner even with complex touch surfaces.
  • this object is achieved by an electrode configuration for a capacitive switch arrangement which has at least two touch electrodes and at least two counter-electrodes, the touch electrodes and the Counter-electrodes are each arranged in a row in such a way that each of the at least two touch electrodes can be capacitively coupled to one of the at least two counter-electrodes, and wherein a distance between two touch electrodes arranged directly one after the other is selected in each case such that a high resolving power is achieved and at the same time the influence of one touch electrode by other touch electrodes is reduced.
  • the influencing of a touch or transmission electrode by other touch or transmission electrodes is understood here as interference or falsification of a signal supplied by one of the touch electrodes by other touch electrodes.
  • a disturbance or falsification can be caused, for example, by parasitic capacitances or crosstalk.
  • Parasitic capacitance is understood to mean an unwanted and usually disruptive electrical capacitance that exists, for example, between two supply lines or two touch electrodes arranged one after the other, with the actual value of the parasitic capacitance being based, among other things, on the distance between the two directly one after the other arranged touch electrodes.
  • Crosstalk is also commonly referred to as electrical noise or signal interference between conductors. Electrical noise causes several undesired effects.
  • electrical noise can reduce the amplitude of a signal upon actuation of an actuator of a capacitive switch assembly, thereby reducing the accuracy of estimating an actuation location at which the actuator was actuated, and thereby reducing the accuracy of estimating a selected function.
  • the signals for example the amplitude of a detected signal, can be corrupted, which in turn reduces the accuracy of the evaluation of the actuation.
  • the crosstalk therefore leads to undesired signals in the transfer function, which impair the signals and their evaluation.
  • a distance between touch electrodes arranged directly one after the other is selected in such a way that the influencing of signals supplied by one touch electrode by other touch electrodes and thus also the subsequent evaluation of signals in an evaluation unit are reduced as far as possible.
  • the fact that a distance between directly consecutive touch electrodes is also selected in such a way that a high level of resolution is achieved nevertheless also ensures that a difference between two slightly different actuation locations is also reliably detected can be reliably differentiated, for example, between actuations at a first actuation location and actuations at a second actuation location that is slightly spaced apart from the first actuation location.
  • an electrode configuration for a capacitive switch arrangement is thus specified, with which errors in the signal transmission can be avoided, in particular even in the case of complex touch surfaces, and the subsequent evaluation of the signals can be further optimized.
  • the distance between two touch electrodes arranged directly one after the other can be greater than or equal to 1 mm.
  • the distance between two touch electrodes arranged directly one after the other can be greater than or equal to 1 mm.
  • the distance between two touch electrodes arranged directly one after the other can be selected in such a way that the number of touch electrodes arranged in a predetermined area is maximized, with the boundary condition that at the same time the influence of one touch electrode by other touch electrodes is reduced. Because the number of touch electrodes arranged in a predetermined, ie known or determinable area is maximized, the number of actuation locations and associated functions provided in this predetermined area can also be maximized at the same time and thus the resolution capacity can also be maximized will.
  • a distance between a touch electrode and a counter or receiving electrode that can be brought into a capacitive coupling with this touch electrode can be selected in each case in such a way that a coupling quality between a touch electrode and the counter electrode that can be brought into a capacitive coupling with this touch electrode is high in each case.
  • the coupling quality or the coupling factor is dependent on the distance between the touch electrode and the respective counter-electrode. For example, is the touch electrode too close to the one with this touch electrode in a counter-electrode that can be capacitively coupled, the system works in an over-coupled area in which, for example, resonance frequencies split.
  • the touch electrode is located too far away from the counter-electrode that can be brought into a capacitive coupling with this touch electrode, the resulting field strength is too low to still ensure adequate signal transmission.
  • the fact that the coupling quality is high means that the touch electrode and the corresponding counter-electrode are spaced apart from one another in such a way that signal transmission between the touch electrode and the corresponding counter-electrode is as optimal as possible and potential signal attenuation can be kept small.
  • the distance between a touch electrode and a counter-electrode that can be brought into a capacitive coupling with this is selected in each case such that a coupling quality between a touch electrode and a counter-electrode that can be brought into a capacitive coupling with this touch electrode is high in each case Errors in signal transmission can be avoided even better and the subsequent evaluation of the signals can be further optimized.
  • the distance between a touch electrode and a counter-electrode that can be brought into a capacitive coupling with this touch electrode can be greater than or equal to 0.1 mm and less than or equal to 0.3 mm.
  • signal attenuation of the serial coupling quality can be kept small and usually at a distance between a touch electrode and the counter-electrode that can be capacitively coupled to this touch electrode, which is between 0.1 mm and 0.3 mm a high coupling quality can be guaranteed.
  • the electrodes and in particular the at least two touch electrodes can each be transparent electrodes.
  • Transparent electrodes have the advantage that they can be used over a display in order to provide a touch-sensitive screen that displays information to a user or operator, for example in the form of a selection menu, and through touching certain areas of the display the user can react.
  • such transparent electrodes usually have a lower electrical conductivity, so that it is particularly important to keep the distance between the to optimize individual transparent electrodes and in particular the distance between individual transparent touch electrodes, in particular to keep it as small as possible in order to achieve the highest possible resolution to achieve.
  • the corresponding transparent electrode materials can be, for example, films with an indium tin oxide coating (IOT) or films based on polyethylene terephthalate (PET).
  • IOT indium tin oxide coating
  • PET polyethylene terephthalate
  • the material of the transparent electrodes should be selected in such a way that the conductivity of all the electrodes is as high as possible, while at the same time the insulation between individual electrodes should have as high a resistance as possible.
  • a capacitive switch arrangement is also specified, the capacitive switch arrangement having an electrode configuration as described above, an actuator and a flexible printed circuit board, the touch electrodes being mounted on the actuator and the counter electrodes on the flexible circuit board are attached.
  • Such a capacitive circuit arrangement has the advantage that it has an electrode configuration with which an electrically conductive connection can be implemented in a simple manner even with complex touch surfaces, especially since the electrical connection and signal transmission is implemented by a plate capacitor Plates is formed by the touch and the corresponding counter electrodes. Furthermore, errors in the signal transmission can also be avoided and the subsequent evaluation of the signals can be further optimized. A distance between touch or transmission electrodes arranged directly one after the other is selected in such a way that the influence of signals supplied by one touch electrode by other touch electrodes and thus also the subsequent evaluation of signals in an evaluation unit are reduced as far as possible.
  • a distance between directly consecutive touch electrodes is also selected in such a way that a high resolution is achieved nevertheless also ensures that a difference between two slightly different actuation locations can be reliably detected, for example reliably a distinction can be made between actuation of an actuating element at a first actuation location and actuation of the actuating element at a second actuation location, which is slightly spaced apart from the first actuation location.
  • the flexible printed circuit board can be connected to the actuating element by means of an adhesive connection.
  • the fact that the flexible circuit board can be glued to the actuator has the advantage that even with a complex arrangement of touch surfaces, a electrically conductive connection and a reliable signal transmission can be realized without great effort, without the complex and expensive conversions would be necessary with this touch electrode in a capacitive coupling can be brought into a counter-electrode is high.
  • the fact that the coupling quality is high means in turn that the touch electrode and the corresponding counter-electrode are spaced apart from one another in such a way that signal transmission between the touch electrode and the corresponding counter-electrode is as optimal as possible and potential signal attenuations can be kept small.
  • a further embodiment of the invention also specifies a device which has a capacitive switch arrangement as described above and an evaluation unit coupled to the counter-electrodes for detecting an actuation of the capacitive switch arrangement.
  • Such a device has the advantage that it has an electrode configuration with which an electrically conductive connection can be implemented in a simple manner even with complex touch surfaces, especially since the electrical connection and signal transmission is implemented by a plate capacitor whose plates are connected by the touch and the corresponding counter electrodes are formed. Errors in the signal transmission can also be avoided and the subsequent evaluation of the signals can be further optimized. A distance between touch electrodes arranged directly one after the other is selected such that the influence of signals supplied by one touch electrode by other touch electrodes and thus also the subsequent evaluation of signals in the evaluation unit are reduced as far as possible.
  • a distance between directly consecutive touch electrodes is also selected in such a way that a high resolution is achieved nevertheless also ensures that a difference between two slightly different actuation locations of the capacitive switch arrangement can be reliably detected For example, a reliable distinction can be made between actuations at a first actuation location and actuations at a second actuation location that is slightly spaced apart from the first actuation location.
  • an electrode configuration for a capacitive switch arrangement and a capacitive switch arrangement which has such an electrode configuration, with which a reliable electrically conductive connection can be implemented in a simple manner even with complex touch surfaces.
  • an electrode configuration is specified in which a distance between touch electrodes arranged directly one after the other is selected in such a way that the influence of signals supplied by one touch electrode by other touch electrodes and thus also the subsequent evaluation of signals in an evaluation unit are reduced as far as possible.
  • an electrode configuration for a capacitive circuit arrangement is thus specified with which errors in the signal transmission can be avoided even with complex touch surfaces and the subsequent evaluation of the signals can be further optimized.
  • a flexible printed circuit board having the counter electrodes is connected to the actuating element of the capacitive switch arrangement by an adhesive connection, i.e. the flexible printed circuit board is glued to the actuating element, a reliable electrically conductive connection can be achieved in a simple manner even with complex touch surfaces - binding and signal transmission can be realized.
  • FIG. 1 shows a view of a device according to embodiments of the invention
  • FIG. 2 shows a view of an electrode configuration for a capacitive switch arrangement according to embodiments of the invention
  • FIG. 3A shows a schematic perspective plan view of a top side of an actuating element of a capacitive switch arrangement according to a first embodiment
  • FIG. 3B shows a schematic perspective plan view of an underside of an actuating element of the capacitive switch arrangement according to the first embodiment
  • FIG. 4 shows a cross-sectional view of a capacitive switch arrangement according to embodiments of the invention.
  • FIG. 1 shows a view of a device 1 according to embodiments of the invention.
  • the device has a capacitive switch arrangement 2 .
  • Proximity switches such as capacitive switches
  • devices such as interior maps or overhead lights, sunroofs, and various other devices.
  • Capacitive switches typically employ one or more capacitive sensors to generate a sensing activation field and to detect changes in the activation field indicative of a user actuation of the switch or an actuator of the switch, typically caused by a User's finger in close proximity to or in contact with the sensor.
  • capacitive switches are generally designed to detect user actuations based on a comparison of a detected activation field with a threshold.
  • capacitive switches usually have electrodes laid out with circuitry formed on a substrate.
  • the capacitive switch arrangement 2 has touch electrodes 3 and counter-electrodes 4, each of the touch electrodes 3 being capacitively coupled to one of the counter-electrodes 4, and the device 1 having another one with the counter-electrodes 4 coupled evaluation unit 5, wherein the evaluation unit 5 is designed to detect an actuation of the capacitive switch arrangement 2.
  • the evaluation unit 5 is designed to determine an actuation location at which the capacitive switch arrangement is actuated, and thus also a selected function, from detected signals and in particular from signals tapped off at the counter-electrodes 4 .
  • the device according to FIG. 1 is based on a principle in which a transmitting electrode 3 is supplied with an electrical alternating signal that is provided by a signal generator 6 .
  • the evaluation unit 5 and the signal generator are integrated into a common control unit 7. Furthermore, the evaluation unit and the signal generator can also be designed separately from one another.
  • an alternating electrical field is emitted at the touch electrode 3 .
  • the alternating electric field emitted at the touch electrode 3 is coupled into the counter-electrode via the object, so that a capacitive path is formed between a transmitter and a receiver, in particular between the signal generator 6 and the evaluation unit 5.
  • an electrical signal tapped off at the counter-electrode 4 changes, with the change in the tapped electrical signal being indicative of the actuation of the capacitive switch arrangement 2 .
  • This method is also usually referred to as a transmission method.
  • the two sensor electrodes 3, 4 form what is known as a sensor zone, which is symbolized in FIG
  • the electrically conductive connection of complex devices or complex touch surfaces is often difficult, especially with isolated, transparent touch electrodes, for example due to surface protection, design, coatings, etc. It is important to be able to achieve the highest possible resolution furthermore, it is often also desirable to accommodate a large number of such touch electrodes 3 in a limited area. However, it also proves to be problematic here that errors in the signal transmission, for example crosstalk, can occur if a large number of touch electrodes are arranged within a limited area.
  • the touch electrodes 3 and the counter electrodes 4 are combined in an electrode configuration 9, with the touch electrodes 3 and the counter electrodes 4 being arranged in a row in such a way that each of the touch electrodes 3 is equipped with a counter electrode 4, as described above, can be brought into a capacitive coupling.
  • a distance between two touch electrodes 3 arranged directly one after the other is further selected in such a way that a high resolution capacity is achieved and at the same time the influence of one touch electrode 3 by other touch electrodes 3 is reduced.
  • the distance between touch electrodes 3 arranged directly one after the other is symbolized in FIG. 1 by the arrow provided with the reference symbol dss.
  • the influencing of a touch electrode 3 by other touch electrodes 3 is understood here as interference or falsification of a signal supplied by one of the touch electrodes 3 by other touch electrodes 3 .
  • Such a disturbance or falsification can be caused, for example, by parasitic capacitances or crosstalk.
  • Parasitic capacitance is understood to mean an unwanted and usually disruptive electrical capacitance that exists, for example, between two supply lines or two touch electrodes 3 arranged directly one after the other, with the actual value of the parasitic capacitance being directly dependent on the distance between the two, among other things consecutively arranged touch electrodes 3 based.
  • Crosstalk is also commonly referred to as electrical noise or signal interference between conductors. Electrical noise causes several undesirable effects.
  • electrical noise can reduce the amplitude of a signal when the object approaches the capacitive switch assembly 2 and/or when the capacitive switch assembly 2 is actuated, thereby reducing the accuracy of the estimation of an actuation location at which a Actuator of the capacitive switch arrangement 2 is actuated is reduced.
  • the signals for example the amplitude of a detected signal, can be falsified, which in turn reduces the accuracy of the evaluation and in particular the estimation of the actuation location.
  • the crosstalk therefore leads to unwanted signals in the transfer function, which degrade the signals and their evaluation.
  • a distance between touch electrodes 3 arranged directly one after the other is selected in such a way that influencing of signals supplied by one touch electrode 3 by other touch electrodes 3 and thus also the subsequent evaluation of signals in the evaluation unit 5 be reduced as far as possible.
  • the capacitive switch arrangement 2 thus has an electrode configuration 9 with which errors in the signal transmission can be avoided even with complex touch surfaces and the subsequent evaluation of the signals can be further optimized.
  • a distance between touch electrodes 3 arranged directly one after the other is always the same. Furthermore, the distance between individual touch electrodes arranged directly one after the other can also vary and thus be of different sizes.
  • the touch electrodes 3 and the counter-electrodes are also each transparent electrodes 10. Due to the lower electrical conductivity compared to materials for non-transparent electrodes or to non-transparent electrodes based on these materials , it is important to optimize the distance between the individual transparent electrodes and in particular the distance between the individual transparent touch electrodes, in particular to keep it as small as possible in order to achieve the highest possible resolution.
  • the electrodes can each be made of a transparent and conductive material such as indi- tin oxide (IOT), the conductive material! completely covers the surface of the shape of the electrodes. That the conductive material! however, the area of the shape of each electrode completely covered is just an example.
  • the conductive material may cover much less than the full area of the shape of the individual electrodes.
  • the transparent, conductive material can also be any other transparent and electrically conductive material.
  • the material of the transparent electrodes should be selected in such a way that the conductivity of all the electrodes is as high as possible, while at the same time the insulation between the individual electrodes should have as high a resistance as possible.
  • FIG. 2 shows an electrode configuration 11 for a capacitive switch arrangement according to embodiments of the invention.
  • the electrode configuration 11 has at least two touch electrodes 13 and at least two counter-electrodes 14, with two touch electrodes in each case in FIG. 2;
  • the touch electrodes 13 and the counter-electrodes 14 are each arranged in a row, with the touch electrodes 13 and the counter-electrodes
  • each of the touch electrodes 13 can be brought into a capacitive coupling with one of the counter electrodes 14, wherein a distance between two touch electrodes 13 arranged directly one after the other is in turn selected such that a high resolving power is achieved and at the same time the influence of a touch electrode 13 by other touch electrodes 13 is reduced.
  • a distance between touch electrodes 13 arranged directly one after the other is again symbolized in FIG. 2 by the arrow provided with the reference symbol dss .
  • the electrode configuration 11 consists of a sequence of touch electrodes 13 arranged one behind the other in a row and a sequence of counter electrodes 14 arranged one behind the other in a row, with a distance between directly adjacent touch electrodes 13 being selected in such a way that a high resolution is achieved and at the same time an influence on a touch electrode 13 by other touch electrodes 13 is reduced.
  • one touch electrode 13 When one touch electrode 13 is influenced by other touch electrodes 13, this in turn causes a disruption or falsification of one of the touch electrodes 13 signal supplied by other touch electrodes 13 understood.
  • a disturbance or falsification can be caused, for example, by parasitic capacitances or crosstalk.
  • Parasitic capacitance is understood to mean an unwanted and usually disruptive electrical capacitance that exists, for example, between two supply lines or two touch electrodes 13 arranged one after the other, with the actual value of the parasitic capacitance being based, among other things, on the distance between the two touch electrodes 13 arranged directly one after the other based.
  • Electrical noise or signal interference between conductors is also generally referred to as crosstalk. Electrical noise causes several undesirable effects.
  • electrical noise can reduce the amplitude of a signal upon actuation of a capacitive switch assembly, thereby reducing the accuracy of estimating an actuation location at which an actuator of the capacitive switch assembly is actuated.
  • the signals for example the amplitude of a detected signal, can be corrupted, which in turn reduces the accuracy of the evaluation.
  • the crosstalk therefore leads to undesired signals in the transfer function, which degrade the signals and their evaluation.
  • the distance d ss between two touch electrodes 13 arranged directly one after the other is in each case greater than or equal to 1 mm.
  • a distance d ss between two touch electrodes 13 arranged directly one after the other is also selected in each case in such a way that the number of touch electrodes 13 arranged in a predetermined area is maximized, under the boundary condition that one touch electrode is influenced at the same time 13 is reduced by other touch electrodes 13.
  • a distance between a touch electrode 13 and a counter-electrode 14 that can be brought into a capacitive coupling with this touch electrode 13 is further selected in each case in such a way that a coupling quality between a touch electrode 13 and the counter-electrode that can be brought into a capacitive coupling with this touch electrode 13 14 each is high.
  • the coupling quality or the coupling factor depends on the Distance between the touch electrode 13 and the respective counter-electrode 14. If the touch electrode is, for example, too close to the counter-electrode that can be capacitively coupled with this touch electrode, the system works in an over-coupled range in which, for example, resonance frequencies split.
  • the touch electrode is too far away from the counter-electrode that can be capacitively coupled to this touch electrode, the resulting field strength is too low to still ensure adequate signal transmission.
  • the fact that the coupling quality is high means that the touch electrode 13 and the corresponding counter-electrode 14 are spaced apart from one another in such a way that signal transmission between the touch electrode 13 and the corresponding counter-electrode 14 is as optimal as possible and potential signal attenuation can be kept small.
  • the distance between a touch electrode 13 and a counter-electrode 14 that can be brought into a capacitive coupling with this touch electrode 13 is symbolized in FIG. 2 by the arrow provided with the reference symbol d SE .
  • a distance between a touch electrode 13 and a counter-electrode 14 that can be capacitively coupled thereto is always the same. Furthermore, the distance between individual touch electrodes and corresponding counter-electrodes that can be brought into a capacitive coupling with these can also vary and thus be of different sizes.
  • the distance d SE between a touch electrode 13 and a counter-electrode 14 that can be brought into a capacitive coupling with this touch electrode 13 is in particular greater than or equal to 0.1 mm and less than or equal to 0.3 mm .
  • signal attenuation of the serial coupling quality can be kept small and a high coupling quality can be guaranteed.
  • the touch electrodes 13 are arranged on a surface 12 of an actuating member 16 and the counter-electrodes 14 are arranged on a flexible printed circuit board 10 .
  • the flexible printed circuit board 10 has on one surface 15 an adhesive material, not shown in FIG. 2, by means of which the flexible printed circuit board is bonded to the actuating element can be.
  • the flexible printed circuit board can be glued to the actuator using a double-sided adhesive film.
  • a double-sided adhesive film can be used in the manner of a double-sided adhesive tape.
  • the double-sided adhesive film is of particular advantage since it can be pre-cut to a predefined size before application to the flexible circuit board and/or the actuator. There are also advantages when storing the double-sided adhesive film, since it can be supplied in rolls.
  • Figures 3A and 3B show the application of such an electrode configuration 20 to a correspondingly complex actuating member 21.
  • FIG. 3A shows a schematic perspective plan view of an upper side 22 of an actuating member 21 according to a first embodiment.
  • the actuator is in particular a monolith, for example a monolith made of aluminum.
  • a first edge 23 of the electrode configuration 20 and in particular corresponding contact edges of the individual touch electrodes 24 are on a lateral edge 25 of the upper side 22 of the Actuator 21 glued.
  • the corresponding touch electrodes 24 extend, starting from the lateral edge 25 of the upper side 22 of the actuating element 21, over a lateral surface 26 of the actuating element 21 to an underside of the actuating element 21 opposite the upper side 22 .
  • a distance between touch electrodes 24 arranged directly one after the other is again chosen such that a high resolution is achieved and at the same time the influence of one touch electrode by other touch electrodes is reduced.
  • FIG. 3B shows a schematic perspective plan view of an underside 27 of the actuating member 21 according to the first embodiment. It can be seen here that the electrode configuration 20 is attached to the actuating member 21 in such a way that a second edge of the touch electrodes 24 is glued to the underside 27 . In particular, these are coupling regions 28 of the touch electrodes 24 that can be brought into a capacitive coupling with the corresponding counter-electrodes (not shown in FIG. 3B).
  • corresponding fitting elements 29 which can be inserted into corresponding recesses in the device, ie by means of which the actuating member 21 with the applied electrode configuration 20 can be connected to the complex device.
  • FIG. 4 shows a cross-sectional view of a capacitive switch arrangement 2 according to embodiments of the invention.
  • Components and parts with the same function or construction as in FIG. 1 or FIG. 2 have the same reference numbers and are not explained separately.
  • the capacitive switch arrangement 2 has an actuating element 16 on which the touch electrodes are applied.
  • the touch electrodes can be glued or screwed onto the actuating element, for example.
  • a flexible printed circuit board 10 can also be seen, which is connected to the actuating element 16 by an adhesive connection.
  • the flexible printed circuit board 10 is glued to the actuating member 16 in such a way that the coupling quality between a touch electrode and the counter-electrode that can be brought into a capacitive coupling with this touch electrode is high in each case.
  • the fact that the coupling quality is high means in turn that the touch electrode and the corresponding counter-electrode are spaced apart from one another in such a way that signal transmission between the touch electrode and the corresponding counter-electrode is as optimal as possible and potential signal attenuations can be kept small.
  • an electrically conductive connection can thus be implemented in a simple manner even with complex touch surfaces, especially since the electrical connection and signal transmission are carried out by a plate capacitor is realized, the plates of which are each formed by the touch and the corresponding counter electrodes.
  • the adhesive connection can also be a connection formed by a dielectric adhesive material.
  • the flexible printed circuit board 10 can have an evaluation unit for evaluating signals picked up by the counter-electrodes.

Landscapes

  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

L'invention concerne une configuration d'électrodes pour un agencement de commutateurs capacitifs présentant au moins deux électrodes tactiles (3, 13, 24) et au moins deux contre-électrodes (4, 14), lesdites deux électrodes tactiles (3, 13, 24) et lesdites deux contre-électrodes (4, 14) étant chacune agencées en série de sorte que chacune desdites deux électrodes tactiles (3, 13, 24) peut être mise en couplage capacitif avec une contre-électrode respective parmi lesdites deux contre-électrodes (4, 14), et une distance entre deux électrodes tactiles (3, 13, 24) agencées directement en succession étant sélectionnée de sorte qu'une capacité de résolution élevée est obtenue et, en même temps, une influence sur une électrode tactile (3, 13, 24) provenant d'autres électrodes tactiles (3, 13, 24) est réduite.
PCT/EP2021/081540 2020-11-13 2021-11-12 Configuration d'électrodes pour un agencement de commutateurs capacitifs WO2022101417A1 (fr)

Applications Claiming Priority (2)

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DE102020214333.1A DE102020214333A1 (de) 2020-11-13 2020-11-13 Elektrodenkonfiguration für eine kapazitive Schalteranordnung
DE102020214333.1 2020-11-13

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WO2022101417A1 true WO2022101417A1 (fr) 2022-05-19

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112007001643T5 (de) 2006-07-10 2009-05-20 QRG Ltd., Eastleigh Berührungsempfindliche Benutzerschnittstelle
DE102011003734B3 (de) 2011-02-07 2012-06-14 Ident Technology Ag Elektrodenkonfiguration für eine kapazitive Sensoreinrichtung sowie kapazitive Sensoreinrichtung zur Annäherungsdetektion
WO2013041520A1 (fr) 2011-09-22 2013-03-28 Behr-Hella Thermocontrol Gmbh Dispositif de commande, par exemple interface homme-machine, en particulier pour un composant de véhicule
DE102014212250A1 (de) 2013-06-27 2014-12-31 Atmel Corp. Abschirmungsfreie rauschunterdrückung in berührungssensoren
EP2983067A1 (fr) * 2013-04-04 2016-02-10 Sony Corporation Dispositif d'entrée et appareil électronique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112007001643T5 (de) 2006-07-10 2009-05-20 QRG Ltd., Eastleigh Berührungsempfindliche Benutzerschnittstelle
DE102011003734B3 (de) 2011-02-07 2012-06-14 Ident Technology Ag Elektrodenkonfiguration für eine kapazitive Sensoreinrichtung sowie kapazitive Sensoreinrichtung zur Annäherungsdetektion
WO2013041520A1 (fr) 2011-09-22 2013-03-28 Behr-Hella Thermocontrol Gmbh Dispositif de commande, par exemple interface homme-machine, en particulier pour un composant de véhicule
EP2983067A1 (fr) * 2013-04-04 2016-02-10 Sony Corporation Dispositif d'entrée et appareil électronique
DE102014212250A1 (de) 2013-06-27 2014-12-31 Atmel Corp. Abschirmungsfreie rauschunterdrückung in berührungssensoren

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