WO2010089206A1 - Capteur tactile capacitif - Google Patents

Capteur tactile capacitif Download PDF

Info

Publication number
WO2010089206A1
WO2010089206A1 PCT/EP2010/050728 EP2010050728W WO2010089206A1 WO 2010089206 A1 WO2010089206 A1 WO 2010089206A1 EP 2010050728 W EP2010050728 W EP 2010050728W WO 2010089206 A1 WO2010089206 A1 WO 2010089206A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductive
capacitor electrode
control
evaluation
operating element
Prior art date
Application number
PCT/EP2010/050728
Other languages
German (de)
English (en)
Inventor
Andreas Kramlich
Original Assignee
Preh 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.)
Filing date
Publication date
Application filed by Preh Gmbh filed Critical Preh Gmbh
Priority to CN2010800065294A priority Critical patent/CN102265517A/zh
Publication of WO2010089206A1 publication Critical patent/WO2010089206A1/fr

Links

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
    • 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
    • H03K2217/96015—Constructional details for touch switches
    • H03K2217/96019—Constructional details for touch switches using conductive paint
    • 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
    • H03K2217/96077—Constructional details of capacitive touch and proximity switches comprising an electrode which is floating

Definitions

  • the invention relates to an operating element which has a capacitive proximity sensor.
  • the sensor comprises at least one capacitor electrode for generating a measuring field in an approach area facing the operator to a user interface of the operating element and an evaluation and control circuit which is connected to the capacitor electrode. By means of the evaluation and control circuit, the capacitance defined by the capacitor electrode can be determined.
  • a capacitive proximity sensor or switch is a non-contact sensor - d. H. without direct contact - on approach of a conductive or non-conductive object, but also of liquids, reacted with an electrical switching signal. It uses the thereby changing electrical capacitance of a capacitor electrode to the environment or a reference electrode.
  • Such sensors work with an oscillator whose frequency-determining capacity is partly formed by the medium or environment to be detected.
  • the capacitance change is based on a change in the effective dielectric constant in the area of the measuring field;
  • the achievable switching distance is up to 40 mm, depending on the size of the sensor.
  • the switching distance can increase to approx. 60-80 mm.
  • Capacitive proximity sensors and their control and evaluation unit usually provide a possibility of calibration in order to adapt the sensitivity or the switching thresholds to the conditions of use. With high sensitivity, however, the influence of disturbance variables (eg humidity, dirt) increases.
  • the known proximity sensors have the disadvantage that the switching distance is very much dependent on the environmental properties as well as the nature of the introduced into the measuring field object so the hand of an operator and the approach angle. For example, the switching distance is increased in the case of a moist skin surface.
  • the response capacitive proximity switch by a hysteresis characterized.
  • the electromagnetic field emitted in the direction of the operator can prove to be critical from an EMC point of view and its strength can not be arbitrarily increased.
  • capacitive touch sensors are known.
  • a capacitive touch sensor consists of two adjacent, electrically conductive, plate-shaped electrodes. These form a capacitor whose capacitance is directly proportional to the thickness of the plates and inversely proportional to the distance between them.
  • an additional parallel capacity is added to the self-capacitance of the device. To determine the operation of such a switching element, this capacitance change must be measured.
  • a disadvantage of the contact sensors is that the contacting of the near Bermmobervidnahen electrodes is relatively expensive, and they can be easily disturbed or destroyed by electrostatic discharge.
  • the possibilities regarding the introduction of symbols and their fluoroscopy as well as regarding the surface design are subject to great restrictions due to the mandatory, near-surface arrangement of the electrodes and their contacting.
  • the invention relates to an operating element, which has a capacitive proximity sensor with at least one capacitor electrode for generating a measuring field in an approach region facing the operator to a user interface of the operating element and an evaluation and control circuit.
  • the evaluation and control electrode is connected by means of an electrical conductor to the at least one capacitor electrode.
  • the evaluation and control circuit serves to determine the capacitance defined by the capacitor electrode, for example with respect to the environment or a counterelectrode, and to carry out a switching or regulating operation when the capacitance changes.
  • proximity sensors are known from the prior art and constructed comparatively space-saving.
  • the operating element according to the invention is characterized in that at least one conductive, electrically insulated layer is arranged in the measuring field, which at least partially forms a contact surface as a user interface.
  • the arrangement of the conductive layer in the measuring field has the advantage that the electromagnetic measuring field generated by the proximity sensor is reduced on the side of the layer facing away from the sensor and thus a shielding is achieved. This reduces the electromagnetic interference caused by the proximity sensor in the operating area.
  • it may also be a non-closed area, for example a grid,
  • the layer will have at least one dimension corresponding to the extent of the proximity sensor
  • the layer can easily meet the optical requirements
  • the layer may be adapted to the appearance of the environment of the operating element in order to be visually inconspicuous or not recognizable.
  • the layer can be relatively large and it does not matter where it is touched, operating errors can be avoided.
  • the layer may have any shapes, may be flat or curved.
  • the area defined by the layer is preferably formed parallel to the area defined by the capacitor electrode, so that the sensitivity of the operating element according to the invention is as little as possible dependent on the contact point on the insulated, conductive layer.
  • the arrangement of the conductive layer in the user interface causes the charge carriers induced thereon to flow off when the layer touches, and the resulting sudden capacitance change can be very well detected by the evaluation and control unit.
  • the reliability of the switching operation can be improved.
  • Ambient and Hystereseeinfladore can be reduced, since at the latest when touching the conductive layer by the associated, relatively large jump change in the capacity of the switching is triggered.
  • the at least one insulated, conductive layer and the control and evaluation unit are designed so that the switching operation is performed only by touching the user interface by the control circuit in order to increase the reliability of operation. This can easily be done, for example, by adjusting the sensitivity of the evaluation unit.
  • the control element according to the invention is not limited to one, ie single, conductive layer, but it may be provided a layer structure of a plurality of conductive, insulated layers.
  • a second, less conductive, the actual user interface forming layer may be applied to a first, more conductive layer.
  • the second layer is achieved by painting with a conductive paint. It depends on the conductivity that a detectable capacitance jump in contact with the respective outer and thus touchable layer can be determined.
  • the conductive, insulated layer or the layer structure is formed as a coating of a diaphragm or cap body of an operating element in order to be able to produce the layer easily and to give it sufficient stability.
  • the diaphragm or cap body is preferably arranged between the proximity sensor and the insulated, conductive layer or layer structure. As a result, the proximity sensor is protected from environmental influences, such as moisture.
  • the proximity sensor is arranged adjacent to the diaphragm or cap body.
  • the cap body of a button or a knob.
  • the control element according to the invention can act alone as a control element, but it is also possible that the controls according to the invention can be provided by combinations with other types of controls with other functionalities.
  • the insulated conductive layer is applied to a movable cap body to manually perform a switching or regulating operation by moving it.
  • the at least one insulated, conductive layer is formed by a conductive lacquer or a conductive PVD coating.
  • the invention further relates to a motor vehicle, which is advantageously characterized by an operating element in one of the previously described embodiments.
  • the control element according to the invention is integrated in a dashboard or a control panel.
  • the invention further relates to a method for producing a control element.
  • a capacitive proximity sensor with at least one capacitor electrode for generating a measuring field in an approach area facing the operator to a user interface of the operating element and an evaluation and control circuit connected to the capacitor electrode is conductively connected, mounted under a diaphragm or cap body of the control.
  • the evaluation and control circuit By means of the evaluation and control circuit, the capacitance of the capacitor electrode can be determined.
  • the evaluation and control circuit further performs a switching operation upon detection of a change in the capacitance.
  • the method is further characterized by a coating step, for example a PVD coating, a coating or the like, in which the diaphragm or cap body is at least partially provided with at least one insulated, conductive layer which is arranged in the measuring field of the proximity sensor.
  • a coating step for example a PVD coating, a coating or the like, in which the diaphragm or cap body is at least partially provided with at least one insulated, conductive layer which is arranged in the measuring field of the proximity sensor.
  • Figure 2 shows a particularly preferred embodiment of the invention, but this is not limited thereto. They show schematically:
  • Fig. 1 is a sectional view of a non-inventive control element
  • FIG. 2 shows a sectional view of an operating element according to the invention.
  • FIG. 1 shows a sectional view of a control element not according to the invention
  • the proximity sensor 2, 3, 4 has a capacitor electrode 3, which generates a measuring field directed upward in FIG. By means of the line 4, the capacitor electrode 3 is conductively connected to an evaluation and control unit 2.
  • the proximity sensor 2 has a capacitor electrode 3, which generates a measuring field directed upward in FIG. By means of the line 4, the capacitor electrode 3 is conductively connected to an evaluation and control unit 2.
  • the evaluation and control unit 2 serves to detect a change in capacitance of a capacitor formed by the capacitor electrode 3 to ground.
  • the capacitance change is effected, for example, by the movement, for example, approach of a hand in the measuring field.
  • predetermined switching thresholds By in the evaluation and control unit 2 predetermined switching thresholds, a switching operation can be performed.
  • the proximity sensor 2, 3, 4 has the disadvantage that the predetermined by the switching thresholds switching distance depends very much on the environmental properties as well as the nature of the introduced into the measuring field object so the hand of an operator and the approach angle. For example, the switching distance is increased in the case of a moist skin surface.
  • the response of capacitive proximity switches is characterized by a hysteresis.
  • the electromagnetic field emitted in the direction of the operator can prove to be critical from an EMC point of view and its strength can not be arbitrarily increased. If touch detection is to be carried out with a proximity sensor, this is difficult, since the switching thresholds to be defined are subject to strong fluctuations due to environmental conditions, such as temperature, interference fields.
  • FIG. 2 shows a comparison of a preferred embodiment 10 of the operating element according to the invention.
  • This likewise comprises a proximity sensor 12, 13, 14.
  • the proximity sensor 12, 13, 14 has a capacitor electrode 3 which generates a measuring field directed upward in FIG. By means of the line 14, the capacitor electrode 13 is conductively connected to an evaluation and control unit 12.
  • the proximity sensor 12, 13, 14 is arranged on a surface facing away from the operator surface of a diaphragm or key cap 15.
  • the key cap 15 is provided with a conductive layer structure of a first insulated conductive layer 11 and a second insulated less conductive layer 16 applied over it.
  • the isolated, conductive layers 11, 16 located in the measuring field cause the electromagnetic measuring field generated by the proximity sensor 12, 13, 14 to be greatly reduced on the side of the layers 11, 16 remote from the sensor 12, 13, 14, and thus a shading is reached. As shown, the layers 11, 16 have an extension that exceeds the extent of the capacitor electrode 3.
  • the arrangement and design of the conductive layers 11, 16 as a user interface that upon contact of the layers 11, 16, the charge carriers induced thereon can flow off and the resulting sudden capacitance change can be detected very well by the evaluation and control unit 12.
  • the reliability of the switching operation can be improved.
  • Ambient and hysteresis influences can be reduced because at the latest when touching the conductive layers 11, 16 can be triggered by the concomitant, relatively large jump change in the capacity of the switching operation.

Landscapes

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

Abstract

L'invention concerne un élément de commande (10) comportant un capteur d'approche capacitif (12, 13, 14) doté d'au moins une électrode de condensateur (13) pour générer un champ de mesure dans une zone d'approche orientée vers l'utilisateur, sur une interface utilisateur de l'élément de commande (10), ainsi qu'un circuit d'analyse et de commande (12) relié de manière conductrice à l'électrode de condensateur (13), le circuit d'analyse et de commande (12) permettant de déterminer la capacité de l'électrode de condensateur (13) et, en cas de modification de la capacité, d'exécuter une opération de commutation. L'élément de commande (10) est caractérisé en ce qu'au moins une couche (11, 16) conductrice électriquement isolée est disposée dans le champ de mesure, cette couche formant une surface de contact en tant qu'interface utilisateur.
PCT/EP2010/050728 2009-02-06 2010-01-22 Capteur tactile capacitif WO2010089206A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010800065294A CN102265517A (zh) 2009-02-06 2010-01-22 电容接触式传感器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009007917.3 2009-02-06
DE102009007917A DE102009007917A1 (de) 2009-02-06 2009-02-06 Kapazitiver Berührungsensor

Publications (1)

Publication Number Publication Date
WO2010089206A1 true WO2010089206A1 (fr) 2010-08-12

Family

ID=42199516

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/050728 WO2010089206A1 (fr) 2009-02-06 2010-01-22 Capteur tactile capacitif

Country Status (3)

Country Link
CN (1) CN102265517A (fr)
DE (1) DE102009007917A1 (fr)
WO (1) WO2010089206A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110858110A (zh) * 2018-08-23 2020-03-03 普瑞有限公司 具有能在电容式检测表面上移动的手动部和冗余电容电势耦合的输入设备

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI483548B (zh) * 2011-11-15 2015-05-01 Quanta Comp Inc Method of manufacturing proximity sensor module
CN108336989A (zh) * 2017-01-18 2018-07-27 佛山市顺德区美的电热电器制造有限公司 电烹饪器及其感应装置
DE102017111253B4 (de) * 2017-05-23 2020-10-01 Preh Gmbh Verfahren zur kapazitiven Berühr- und Betätigungsdetektion
DE102020122368B4 (de) * 2020-08-26 2024-01-11 Ewellix AB Positionssensor und Herstellungsverfahren sowie Verfahren zur Ermittlung einer Stellung eines Linearaktuators

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054306A1 (fr) * 1980-12-17 1982-06-23 Bosch-Siemens HausgerÀ¤te GmbH Commutateur capacitif à effleurement pour appareils ménagers électriques
GB2156992A (en) * 1984-03-31 1985-10-16 Glaverbel Proximity control switches
DE102004026836A1 (de) * 2004-05-28 2005-12-22 Schott Ag Berührungsschalteinrichtung
DE102004043415A1 (de) * 2004-09-01 2006-03-09 E.G.O. Control Systems Gmbh Sensorvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2027209A (en) * 1978-07-10 1980-02-13 Gen Electric Capacitive touchpad sensors
DE2965704D1 (en) * 1978-09-22 1983-07-28 Kurt Tschannen Circuit arrangement for the contactless switching of electrical equipments
EP1682859A4 (fr) * 2003-08-11 2007-08-22 Analog Devices Inc Capteur capacitif

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054306A1 (fr) * 1980-12-17 1982-06-23 Bosch-Siemens HausgerÀ¤te GmbH Commutateur capacitif à effleurement pour appareils ménagers électriques
GB2156992A (en) * 1984-03-31 1985-10-16 Glaverbel Proximity control switches
DE102004026836A1 (de) * 2004-05-28 2005-12-22 Schott Ag Berührungsschalteinrichtung
DE102004043415A1 (de) * 2004-09-01 2006-03-09 E.G.O. Control Systems Gmbh Sensorvorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110858110A (zh) * 2018-08-23 2020-03-03 普瑞有限公司 具有能在电容式检测表面上移动的手动部和冗余电容电势耦合的输入设备
CN110858110B (zh) * 2018-08-23 2023-05-23 普瑞有限公司 具有能在电容式检测表面上移动的手动部和冗余电容电势耦合的输入设备

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Publication number Publication date
DE102009007917A1 (de) 2010-08-12
CN102265517A (zh) 2011-11-30

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