EP3814880A1 - Capteur capacitif pour la reconnaissance tactile - Google Patents

Capteur capacitif pour la reconnaissance tactile

Info

Publication number
EP3814880A1
EP3814880A1 EP19734774.3A EP19734774A EP3814880A1 EP 3814880 A1 EP3814880 A1 EP 3814880A1 EP 19734774 A EP19734774 A EP 19734774A EP 3814880 A1 EP3814880 A1 EP 3814880A1
Authority
EP
European Patent Office
Prior art keywords
sensor
electrode
sensor electrode
evaluation device
signal
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP19734774.3A
Other languages
German (de)
English (en)
Inventor
Matthias Seifert
Christian Brüggemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kostal Automobil Elektrik GmbH and Co KG
Original Assignee
Kostal Automobil Elektrik GmbH and Co KG
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.)
Filing date
Publication date
Application filed by Kostal Automobil Elektrik GmbH and Co KG filed Critical Kostal Automobil Elektrik GmbH and Co KG
Publication of EP3814880A1 publication Critical patent/EP3814880A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04186—Touch location disambiguation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0448—Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a capacitive sensor system for touch detection, with a sensor surface on which at least one sensor electrode is arranged, and with an evaluation device for evaluating an electrical sensor signal of the sensor electrode, which is determined by the position of a sensor electrode
  • Measurement object can be influenced in one direction in the plane of the sensor surface.
  • Capacitive sensor systems of the type mentioned here are called
  • Touch-sensitive controls used on user interfaces, such as in consumer electronics devices or in
  • Illuminated areas of a sensor are either left out or implemented using transparent conductive materials.
  • the sensor signal To detect a touch, the sensor signal must exceed a signal threshold.
  • Sensor areas are smaller or similar in size to the measurement object, i.e. something special like an operating finger.
  • the sensor signal in the plane of the control surface only drops slowly beyond the edge of the sensor surface.
  • a threshold value condition adapted for small fingers can then already become one for large fingers incorrect touch detection a few centimeters outside the control surface.
  • the task was to create a capacitive sensor system
  • a capacitive sensor system for touch detection is already known, with a sensor surface on which at least one sensor electrode is arranged, and with an evaluation device for evaluating an electrical sensor signal of the sensor electrode, which is determined by the position of a measurement object in can be influenced in a direction in the plane of the sensor surface, a first and a second sensor electrode surrounding the sensor surface, the first sensor electrode and the second sensor electrode being parallel to one another
  • the second sensor electrode being surrounded by the first sensor electrode, both electrodes having inputs of the evaluation device are connected, and wherein the evaluation device detects sensor signals of the first and second sensor electrodes, and determines a ratio from the ratio of the difference and the sum of the detected sensor signals and compares them with a threshold value.
  • This previously known sensor system uses a sensor element which is subdivided into at least two sensor surfaces located close to one another, with a first sensor element becoming continuously smaller and a second sensor element continuously increasing in one direction. As a result, the detectable sensor signal changes with the respective location of the actuation.
  • Sensor surfaces are therefore essentially formed by interlocking triangular surfaces.
  • the invention provides for touch detection by means of parallel, non-touching closed conductor loops.
  • FIG. 3 shows a schematically represented evaluation device
  • FIG. 4 shows the diagram of a ratio function
  • Figure 5 is a schematically illustrated sensor arrangement according to the
  • FIG. 5 shows schematically a sensor arrangement according to the prior art.
  • a capacitive touch switch with a rectangular metallic frame as the sensor element is known, for example, from German patent DE 10 2007 044 393 B3.
  • FIG. 6 shows qualitative sensor signal profiles of the sensor arrangement outlined in FIG. 5. The problem leading to the invention is to be explained on the basis of this diagram.
  • FIG. 5 shows a sketch of a sensor electrode E in the form of a
  • a direction coordinate X is shown parallel to a side line of the sensor surface SF, the origin point 0 of which is arbitrarily placed in the center of the associated lateral extension area of the sensor surface SF.
  • the direction coordinate X stands purely by way of example for one of the lateral directions in which the measurement object F can be positioned relative to the sensor surface SF. Lateral positioning of the measurement object F in a direction other than the X direction shown results in a qualitatively similar course. Since the capacitive sensor system specifically detects contact, the
  • the measurement object F is a human finger.
  • Sensor signals S emitted by the sensor electrode E are fed to an electronic evaluation device AV, which compares the signal S with a signal threshold S_Schwelle. It is shown as an example that the evaluation device AV checks whether the sensor signal S is equal to a predetermined threshold value S_Schwelle. Alternatively, the evaluation device AV can also stipulate that a valid sensor actuation is present when the value of the sensor signal S either falls below or exceeds a signal threshold S_Schwelle. However, setting a suitable signal threshold S_Schwelle is not without problems. In FIG. 6, the dependence of the sensor signal curve S (x) on the position x of a finger F along the direction coordinate X is plotted. As a relevant parameter that the
  • Sensor signal S (x) influenced the size of the finger F touching the sensor surface SF is taken into account.
  • the sensor signal curves S (x) are therefore plotted in FIG. 6 once for a larger finger as the sensor signal curve S (x) _L and once for a smaller finger as the sensor signal curve S (x) _S.
  • the two graphs of the sensor signal profiles S (x) _L and S (x) _S in FIG. 6 show that both a displacement of a larger and a smaller finger F in the positive X direction from the center to the edge of the sensor surface SF Sensor signal curve S (x) initially rises slightly in order to then fall more or less quickly again outside the sensor area SF, ie beyond the conductor section L.
  • These sensor signal profiles S (x) _L and S (x) _S can lead to
  • FIG. 1 shows a schematic
  • Sensor electrodes E1, E2 deliver their own sensor signal S1, S2, both of which are fed to the inputs of an evaluation device AV.
  • Sensor signals S1, S2 as a function of the finger position x in the X direction indicated in FIG. 1 are outlined in FIG. 2, analogously to the illustration in FIG. 6.
  • the graphs drawn in dashed lines represent the sensor signal profiles S1 (x) _S and S1 (x) _L, which result from the signals S1 from the outer sensor electrode E1, while the graphs drawn throughout show the sensor signal profiles S2 (x) _S and S2 (x) Map _L for the signals S2 of the inner sensor electrode E2.
  • the indices _S and _L again serve to differentiate between a smaller or a larger finger as the respective measurement object F.
  • the signal value curves S2 (x) _S, S2 (x) _L of the inner sensor electrode E2 always have larger values than the signal value curves S1 (x) _S, S1 (x) _L of the outer sensor electrode E1, as long as the finger F is within the sensor area SF surrounded by the inner sensor electrode E2 and conversely the outer sensor electrode E1 always delivers larger signal values S1 (x) _S and S1 (x) _L as soon as the finger F is outside of the area surrounded by the outer sensor electrode E1.
  • the sensor signal curves S1 (x) _S and S2 (x) _S as well as S1 (x) _L and S2 (x) _L each take on an equally large value for a finger F of a given size if it is in the range between the first and the second sensor electrode E1, E2, which can be seen from the intersections of the corresponding graphs in FIG.
  • the sensor signal profiles S (x) shown in FIG. 2 are characteristic of a specific, specific embodiment of a sensor arrangement and can therefore in principle be used by the evaluation device AV shown in sketch form in FIG. 1 for comparison with a threshold value. However, these comparisons would also be significant
  • Evaluation device AV forms a ratio variable V, which, apart from any additive or multiplicative constants that may be present, is given by:
  • V: (S2 - S1) / (S1 + S2)
  • the difference between the two sensor signals S2-S1 is a quantity which provides information about the position of a finger F in the plane of the sensor surface SF.
  • the sum of the two sensor signals S1 + S2 corresponds roughly to the signal of an individual sensor electrode E1, E2 and scales with the finger size. It can therefore be used to normalize the difference signal S2-S1.
  • a ratio function V (x) for the dependence of the ratio variable V on the finger position can also be calculated for the ratio variable V:
  • V (x): (S2 (x) - S1 (x)) / (S1 (x) + S2 (x)) which in turn is typical for a given sensor arrangement.
  • the two ratio functions V (x) _L and V (x) _S shown in FIG. 4 show that their function values for fingers F of different sizes have a relatively small fluctuation range.
  • a threshold value V_Schwelle that is also suitable for fingers F of different sizes can be defined for a touch detection.
  • a horizontal dashed line marks a threshold value V_Schwelle of the size - 0.1.
  • the proposed capacitive sensor system thus enables a precise delimitation of the touch detection within large user interfaces, regardless of the size of a finger touching the sensor.
  • the sensitive areas can be adapted to the geometry of the user interface by means of a positionally precise evaluation.
  • the inner free spaces within the double ring-shaped electrode arrangement can be used for additional purposes, for example for the placement of lighting elements.
  • E, E1, E2 sensor electrodes (conductor loops)

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Quality & Reliability (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Position Input By Displaying (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Electronic Switches (AREA)

Abstract

L'invention concerne un système de capteur capacitif pour la reconnaissance tactile, comprenant une surface de capteur sur laquelle est disposée au moins une électrode de capteur et un dispositif d'évaluation pour évaluer un signal de capteur électrique de l'électrode de capteur qui peut être influencé par la position d'un objet de mesure dans une direction dans le plan de la surface du capteur, une première et une seconde électrode de capteur entourant la surface du capteur, la première électrode de capteur et la seconde électrode de capteur ayant des sections conductrices qui sont parallèles l'une à l'autre sans se toucher, la seconde électrode de capteur étant entourée par la première électrode de capteur, les deux électrodes étant connectées aux entrées du dispositif d'évaluation, et le dispositif d'évaluation détectant les signaux des premier et second capteurs, et déterminant un rapport variable du rapport de la différence à la somme des signaux des capteurs détectés et comparant celui-ci à une valeur seuil.
EP19734774.3A 2018-06-30 2019-06-28 Capteur capacitif pour la reconnaissance tactile Ceased EP3814880A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018005248.7A DE102018005248B4 (de) 2018-06-30 2018-06-30 Kapazitives Sensorsystem zur Berührungserkennung
PCT/EP2019/067318 WO2020002594A1 (fr) 2018-06-30 2019-06-28 Capteur capacitif pour la reconnaissance tactile

Publications (1)

Publication Number Publication Date
EP3814880A1 true EP3814880A1 (fr) 2021-05-05

Family

ID=67137946

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19734774.3A Ceased EP3814880A1 (fr) 2018-06-30 2019-06-28 Capteur capacitif pour la reconnaissance tactile

Country Status (5)

Country Link
US (1) US11106313B1 (fr)
EP (1) EP3814880A1 (fr)
CN (1) CN112334868A (fr)
DE (1) DE102018005248B4 (fr)
WO (1) WO2020002594A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112020006640T5 (de) * 2020-01-27 2022-11-17 Alps Alpine Co., Ltd. Eingabevorrichtung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561247A (en) * 1993-03-30 1996-10-01 Honda Motor Co., Ltd. Pressure sensor
DE102004038872A1 (de) * 2004-08-05 2006-03-16 E.G.O. Elektro-Gerätebau GmbH Kapazitiver Berührungsschalter für eine Bedieneinrichtung eines Elektrogeräts, Bedieneinrichtung sowie Verfahren zur Auswertung
US20070247446A1 (en) * 2006-04-25 2007-10-25 Timothy James Orsley Linear positioning input device
DE102007044393B3 (de) 2007-09-18 2009-04-09 BSH Bosch und Siemens Hausgeräte GmbH Kapazitiver Annäherungs- und/oder Berührungsschalter
KR20100100773A (ko) * 2007-10-04 2010-09-15 가부시키가이샤후지쿠라 정전용량형 근접센서 및 근접검지방법
JP5531768B2 (ja) * 2010-05-13 2014-06-25 ソニー株式会社 情報入力装置
DE102011002447B4 (de) * 2011-01-04 2014-07-10 Ident Technology Ag Kapazitiver Annäherungsensor sowie Verfahren zur kapazitiven Annäherungsdetektion
DE102012205126A1 (de) * 2012-03-29 2013-10-02 Robert Bosch Gmbh Kapazitives Ortungsgerät
US9979389B2 (en) * 2012-07-13 2018-05-22 Semtech Corporation Capacitive body proximity sensor system
US20160154507A1 (en) * 2014-12-01 2016-06-02 Cypress Semiconductor Corporation Systems, methods, and devices for touch event and hover event detection

Also Published As

Publication number Publication date
DE102018005248B4 (de) 2024-07-18
CN112334868A (zh) 2021-02-05
US11106313B1 (en) 2021-08-31
DE102018005248A1 (de) 2020-01-02
WO2020002594A1 (fr) 2020-01-02
US20210255754A1 (en) 2021-08-19

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