WO2007144040A2 - Capteur tactile - Google Patents

Capteur tactile Download PDF

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Publication number
WO2007144040A2
WO2007144040A2 PCT/EP2007/003468 EP2007003468W WO2007144040A2 WO 2007144040 A2 WO2007144040 A2 WO 2007144040A2 EP 2007003468 W EP2007003468 W EP 2007003468W WO 2007144040 A2 WO2007144040 A2 WO 2007144040A2
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
sensor
shielding
inner electrode
capacitance
Prior art date
Application number
PCT/EP2007/003468
Other languages
German (de)
English (en)
Other versions
WO2007144040A3 (fr
Inventor
Holger WÜRSTLEIN
Carsten Abert
Thomas Weingärtner
Original Assignee
Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg
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 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg filed Critical Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg
Publication of WO2007144040A2 publication Critical patent/WO2007144040A2/fr
Publication of WO2007144040A3 publication Critical patent/WO2007144040A3/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
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/40—Safety devices, e.g. detection of obstructions or end positions
    • E05F15/42—Detection using safety edges
    • E05F15/46—Detection using safety edges responsive to changes in electrical capacitance
    • 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
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector
    • 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
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • H03K17/975—Switches controlled by moving an element forming part of the switch using a capacitive movable element
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
    • E05Y2900/53—Type of wing
    • E05Y2900/55—Windows
    • 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
    • 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
    • H03K2217/96003—Touch switches using acoustic waves, e.g. ultrasound
    • H03K2217/96011—Touch switches using acoustic waves, e.g. ultrasound with propagation, SAW or BAW
    • 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
    • H03K2217/960765—Details of shielding arrangements
    • 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
    • H03K2217/96078—Sensor being a wire or a strip, e.g. used in automobile door handles or bumpers

Definitions

  • the invention relates to a tactile sensor, in particular for detecting an obstacle in the path of an actuating element of a motor vehicle, which is based on a capacitive measuring principle.
  • Such a tactile sensor shows a contact, for example, due to a force caused by a contact force or pressure as a measurement signal, a capacitance change, which is detected by a corresponding evaluation circuit.
  • the touch sensitivity of such a sensor is particularly suitable for detecting an obstacle in the opening region of an actuating element of a motor vehicle. If, for example, such a sensor is arranged along the closing edge of an actuating element, then an obstacle detected by the actuating element during the closing operation can be detected by means of the change in capacitance, so that corresponding countermeasures, such as stopping or reversing the drive, can be taken.
  • the control elements of a motor vehicle may be, for example, an electrically operable window, an electrically operated sliding door or an electrically operable tailgate. It is also possible to use a tactile sensor based on the capacitive measuring principle for detecting obstacles in the case of an electrically actuable seat.
  • a tactile sensor of the aforementioned type is known, for example, from EP 1 455 044 A2.
  • a sensor is proposed for detecting an obstacle in the opening region of an actuating element of a motor vehicle, which is constructed essentially of two separated by a materiajmap bubble separated in an elastic insulating material ladders.
  • an electric field is generated on the one hand. This electric field affects the capacitance to be measured between the conductors.
  • An approaching object due to its dielectric constant, leads to a change in the tion of the external electric field and thus to a detectable capacitance change.
  • the sensor described in EP 1 455 044 A2 is very sensitive to interfering external electromagnetic fields.
  • a tactile sensor with an inner electrode which can be placed on a measuring potential, with a shielding electrode spaced from the inner electrode via an elastic, electrically insulating material, which can be laid to a ground potential, and with an evaluation circuit connected to the inner electrode for detecting a Capacity between the inner electrode and the shielding electrode.
  • the invention is based on the consideration that said sensor of the prior art is prone to interference with external electromagnetic fields, because the caused by an approach of the electrodes capacitance change also depends on an external electric field, which is generated in particular by the current-carrying electrodes themselves .
  • this is desirable per se, as this causes the approach of an object on the interaction with the external electric field to a detectable change in capacity.
  • the capacitance change resulting from the approach of the electrodes is thus also easily influenced by an external electric field and thus in particular by interference fields.
  • a tactile capacitive sensor with low susceptibility to external electromagnetic fields can be provided by making the distance-dependent capacitance between the electrodes independent of an external electric field.
  • one of the electrodes forming the capacitance is formed as a shielding electrode, which can be connected to a ground potential, in particular to a ground potential.
  • the second electrode is configured as an inner electrode which can be laid to a measuring potential, a tactile capacitive sensor is thereby created with surprisingly simple means, wherein the intermediate space between inner electrode and shielding electrode is shielded from external electric fields.
  • a shielding electrode is understood to be an electrode which has a shape suitable for shielding the gap from external electromagnetic fields. In this case, the Faraday 's effect is exploited so that, depending on the field of use, the desired sensitivity or the frequency of the fields to be screened, the shielding electrode can completely or only partially cover, surround or enclose the inner electrode for this purpose.
  • the shielding electrode can be designed as a flat conductor with or without openings, as a mesh or as a grid of suitable shape.
  • good shielding can be achieved if the inner electrode is partially enclosed by the shielding electrode, ie if the inner electrode is arranged in a cross section of the sensor between parts or partial areas of the shielding electrode.
  • the contact-sensitive or pressure-dependent capacitance between the inner electrode and the shielding electrode is achieved by the inner electrode being spaced from the shielding electrode by an elastic, electrically insulating material. If the sensor is touched or he gets in contact with a foreign body, as a result of the force caused by the contact or the contact Kraft perspective. Pressure due to the elasticity of the insulating material, the distance between the inner electrode and the shielding electrode. As a result, the capacitance formed between the inner electrode and the shielding electrode changes, which can easily be detected with a correspondingly designed evaluation circuit, for example by applying an alternating voltage to the inner electrode.
  • the capacity In this case, it can be derived from a measured alternating current resistance by means of a measuring bridge, determined from a charging or discharging time, or calculated from the resonance frequency of a resonant circuit with appropriate switching.
  • an elastic and electrically insulating material for example, an elastomeric plastic or a rubber is suitable.
  • a sponge rubber i. an elastic foam of relatively small pore size, or EPDM, i. an ethylene-propylene-diene rubber can be used.
  • the inner electrode is divided into a plurality of separate electrodes, each of which has a separate supply line for connection to the measuring potential.
  • the capacitance formed between the inner and the shielding electrode is reduced, since the entire surface of the inner electrode is divided into a plurality of interrupted individual surfaces of the separate electrodes.
  • a low overall capacitance between the inner and shield electrodes results in a small capacitance change being easier to detect in relation to the total capacitance.
  • Such a tactile sensor designed in this way also allows the detection of a change in capacitance by means of a multiplex method.
  • the individual electrodes can be controlled by means of the separate supply lines either offset in time (serial) or simultaneously (in parallel).
  • the first, serial control has the advantage that in this case only a single evaluation circuit for capacity change is necessary. However, the time constant must be observed until all electrodes have been switched through one after the other.
  • the second, parallel drive does not have the disadvantageous time delay, it requires a plurality of evaluation electronics for the evaluation, which increases the costs.
  • the inner electrode extends in a longitudinal direction and is divided along the longitudinal direction into the plurality of separate electrodes. This makes it possible to guide the sensor along a Einklemm Kunststoffes. In the longitudinal direction of the inner electrode is in this way at a Serial control of the individual electrodes also allows a spatially resolved detection of the touch or pressure contact.
  • the sensor is designed in the manner of a coaxial cable, wherein the inner electrode is embedded as an inner conductor in the elastic and electrically insulating material, which is circulated by the outside of the shielding electrode.
  • a coaxial cable can also be manufactured in a known manner by extrusion. Since the insulating material surrounding the inner electrode deforms from the outside upon application of force or pressure, resulting in a change in capacitance as a result of the change in distance between the inner and shielding electrodes, the shielding electrode encircling the insulating material must have a certain flexibility or elasticity.
  • the shielding electrode in the form of a conductive elastic plastic, also called flex conductor, be configured.
  • the shielding electrode is expediently designed as a flexible conductive foil or as a mesh of conductive fibers, in particular as a metal mesh.
  • the inner conductor can be drawn into an extruded insulating material which has an outer conductive layer.
  • rubber can be used, the outer layer was electrically conductive by introducing conductive particles such as metal particles or graphite.
  • the senor is designed in the manner of a ribbon cable, wherein the inner electrode and the shielding electrode are each formed as a flat conductor, between which a layer of the elastic, insulating material is arranged.
  • the production of ribbon cables is now common practice, so that the desired and suitable structure of inner and shield electrode can be easily realized.
  • the inner electrode In a subdivision of the inner electrode into a plurality of separate individual electrodes, it is particularly possible to lay the individual leads within the insulating material.
  • the individual lead and the insulating material can be embedded in a flexible substrate of the ribbon cable.
  • the flat conductors of inner electrode and shielding electrode by the flexible insulating material both from each other spaced as this to use as a substrate of the ribbon cable generally.
  • a second shielding electrode for shielding an external electric field can be dispensed with if the ribbon cable is arranged at its later place of use on an external electrode, such as a metal surface, which can be laid on ground potential.
  • the inner electrode is to be provided only with a suitable electrical insulation.
  • This refinement lends itself, for example, to the case in which the tactile sensor for detecting an obstacle along the closing edge of an actuating element of a vehicle is applied, for example by gluing.
  • the body of the vehicle forms a shielding electrode which likewise shields the inner electrode.
  • the elastic, insulating material is also used to space or insulate between the inner electrode and the body. An applied on both sides of the flat conductor of the inner electrode layer of the insulating material increases the at
  • a layer of the elastic material is applied on both sides on the flat electrode forming the inner electrode, which is covered in each case with a flat conductor forming the shielding electrode.
  • the susceptibility to interference of the tactile sensor can be further reduced if the flat electrode forming the inner electrode is also covered on its narrow sides by a further flat conductor which forms part of the shielding electrode. In this way, the inner electrode is completely closed to the outside by a surrounding shielding electrode.
  • the shielding electrode expediently faces a counterelectrode which can be placed on a further measuring potential, wherein the shielding electrode and the counterelectrode are separated from one another by a separating electrode, and wherein the evaluating circuit additionally serves to detect a capacitance between the counterelectrode and the shielding electrode is formed.
  • This embodiment creates a tactile sensor which is additionally designed as a contactless proximity sensor. For this purpose, however, the capacitance formed between the inner and the shielding electrode is not used, but the capacitance formed between the shielding electrode and the counterelectrode is taken into account.
  • the separating electrode introduced between the shielding electrode and the counterelectrode it is achieved that no direct capacitance is formed between the shielding electrode and the counterelectrode. Rather, an electric field extending into the room is generated, the change of which is detectable by changing the small capacitance formed between the shielding and counterelectrode while avoiding the separating electrode.
  • the reaching into the space field is formed when using the sensor on a body in particular between the counter electrode and the body. If a dielectric or in general an object with a relative dielectric constant of> 1 enters this field, the capacitance formed by the shielding and counterelectrode thereby changes.
  • an amplifier is expediently provided which, on the input side, terminates via a connecting line with the counterelectrode and on the output side with the isolating electrode in order to supply it with a conductor which is disconnected from the connecting line. guided signal is connected.
  • the senor comprises a suitable material layer for guiding surface waves.
  • a suitable material layer for guiding surface waves This may in particular be a strip of a material of suitable hardness.
  • an electrically insulating material such as plastic, e.g. Plexiglas or the like, to be preferred, since unfavorable shielding effects occur with a conductive material.
  • the surface wave undergoes additional damping during its transmission, which is easily detectable. If the transmission characteristic is observed at several points of the sensor by means of suitable detectors, a spatially resolved detection of an obstacle can also be effected thereby.
  • the tactile sensor can be used in a simple manner for detecting an obstacle in the path of an actuating element of a motor vehicle.
  • the sensor described is guided along contours of the motor vehicle such that it comes to rest between the body or a mounting frame of an actuating element and the movable actuator.
  • An obstacle located in the travel of the control element is then moved or pressed against the sensor during a closing operation of the control element.
  • a detection signal generated thereby by the sensor can then be attracted to the detection of a trapping case, so that appropriate countermeasures can be taken.
  • FIG. 1 shows schematically a side view of a motor vehicle, Fig. 2 in a cross section designed as a coaxial cable tactile sensor,
  • Fig. 3 in a cross section designed as a ribbon cable tactile capacitive sensor
  • FIG. 4 shows a cross section of a multi-sensor designed as a ribbon cable.
  • Fig. 1 shows schematically a side view of a motor vehicle 1, of which the hood 2, the roof 3 and the windshield 4 are visible. Further, a front door 5 and a rear door 6 are shown.
  • the front door 5 has an electrically driven disk 9 as an adjusting element 7.
  • a tactile capacitive sensor 10 is provided, which is designed as a ribbon cable 11.
  • the flat cable 11 are - not shown here - two formed as a flat conductor Ablektroden and one of these by an elastic and electrically insulating material separated inner electrode with - not shown here - a plurality of separate electrodes having separate leads for driving.
  • Fig. 2 the cross section of a coaxial cable designed as a tactile, capacitive sensor 13 is shown.
  • the sensor 13 is shown in Fig. 2a) in a non-contact state and in Fig. 2b) under an external pressure due to contact.
  • the sensor 13 comprises as internal electrode 15 in its interior a continuous electrical conductor and has as shielding electrode 16 an outer shell made of a flexible metal mesh.
  • the shielding electrode 16 is spaced from the inner electrode 15 by an elastic, electrically insulating material 18.
  • EPDM elastic and electrically insulating material.
  • the senor In the non-contact state according to FIG. 2 a), the sensor has a substantially circular cross-section.
  • the capacitance formed between the inner electrode 15 and the shielding electrode 16 or its change is measured.
  • the shielding electrode 16 is set to a ground potential 19, in particular ground potential, so that the capacitance between the inner electrode 15 and the shielding electrode 16 is influenced only slightly or not at all by external electrical interference fields.
  • the measurement of the capacitance itself can be effected in particular by applying an alternating voltage to the inner electrode 15 in relation to the ground potential 19, so that the capacitance can be determined as an alternating current resistance, for example via a measuring bridge.
  • the capacitance formed between the inner electrode 15 and the shielding electrode 16 essentially depends on the radial distance 20 between the inner and shielding electrodes 15 and 16 to each other.
  • the radial distance 20 is fixed, so that the measured capacitance between the inner and outer electrodes 15 and 16 can be regarded as essentially constant.
  • an external force - represented by the force vector 21 - acts on the sensor 13, this results in a deformation of the elastic material 18.
  • the elastic material 18 becomes due to the increased pressure in the direction of the force vector 21 compresses, while it undergoes transverse expansion due to internal pressure compensation, if necessary, an expansion.
  • FIG. 3 another tactile, capacitive sensor 24 is shown in its cross section, which is designed as a ribbon cable.
  • the sensor 24 is shown in Fig. 3a) in its non-contact state and in Fig. 3b) at an external force.
  • this comprises an inner electrode 25 designed as a flat conductor and extending inside, as well as two shielding electrodes 26, also embodied as a flat conductor.
  • a layer of an elastic and electrically insulating material 18 is inserted between each of the outer shield electrodes 26 and the inner electrode 25, a layer of an elastic and electrically insulating material 18 is inserted.
  • a foam rubber i.
  • the inner electrode 25 is additionally covered on its two narrow sides in each case by a further flat conductor 26 ', each forming part of the shielding 26 or with this is electrically contacted.
  • the shielding electrode 26 is set to a ground potential, in particular to ground potential, as previously described in FIG. 2, and the internal electrode 25 is charged with an alternating voltage. With a suitable evaluation circuit, it is easy to measure the forming capacity. If, as shown in FIG. 3 b), a force acts on the sensor 24 in the direction of the illustrated force vector 28 due to an external object, this leads to a compression of the layers of the elastic material 18.
  • the thickness 29 thus changes Since the capacitance of the capacitor comprising the shielding electrode 26 and the inner electrode 25 depends on their spacing and thus on the thickness 29 of the insulating material 18, the force action shown results in a change of the capacitance, so that contact of the sensor 24 becomes detectable. In the case of the sensor 24 extending as a ribbon cable, a locally limited force is sufficient to produce a detectable capacitance change.
  • the internal electrodes 15 and 25 of the sensors 13 and 24, respectively may be subdivided into a plurality of individual electrodes in the cable longitudinal direction.
  • separate supply lines are provided for each of the individual electrodes, so that each capacitance formed respectively from individual inner electrode and shielding electrode 16 or 26 is separately readable or evaluable. Since the formation of individual electrodes reduces the size of the total capacitance, it is easier to detect a capacitance change in comparison to the size of the total capacitance.
  • FIG. 4 shows in a cross section a multisensor configured as a ribbon cable, which is based, in particular, on the capacitive measuring principle.
  • the sensor 30 shown in FIG. 4 initially comprises a basic structure in accordance with the sensor 24 shown in FIG. 3.
  • the two shielding electrodes 26 designed as flat conductors and the flat internal electrode 25 extending between the shielding electrodes 26 can be seen Inner electrode 25, in turn, two flat conductor 26 'are arranged, which are each electrically contacted with the shielding electrodes 26.
  • the shielding electrode 26, 26 'thus formed in its entirety is connected to the ground potential 29, in particular to the ground potential.
  • the inner electrode 26 is divided into a plurality of mutually insulated individual electrodes.
  • Each of these individual electrodes has a separate supply line, via each of which the capacitance between the individual electrode and the inner electrode 25 and the shielding electrode 26 can be measured or evaluated.
  • the separate supply lines 31 are arranged within the insulating and elastic material 18 separating the shielding electrode 26 and the inner electrode 25.
  • the basic unit comprising the shielding electrode 26, 26 ', the inner electrode 25, the feed lines 31 and the layer of elastic material 18 arranged between the electrodes act as a tactile capacitive sensor whose function has already been described with reference to FIG.
  • the senor 30 according to FIG. 4 comprises a counterelectrode 33 again designed as a flat conductor, which is arranged opposite the upper shielding electrode 26. Between the counter electrode 33 and the upper shield electrode 26, a likewise formed as a flat conductor separation electrode 34 is arranged. The electrodes 33 and 34 are embedded in the insulating material 18. In addition, on the surface of the sensor 30, one suitable for propagating surface waves
  • the assembly consisting of upper shield electrode 26, separation electrode 34 and counter electrode 33 operates as a non-contact, based on the capacitive measurement principle proximity sensor, which will be described below.
  • the plastic strip 37 serves to additionally use the sensor 30 as a surface wave sensor.
  • the individual electrodes of the inner electrode 25 are connected via their respective separate leads 31 by means of a connecting line 40 to an evaluation circuit 42.
  • the evaluation circuit 42 registers a change in the capacitance between the shielding electrode 26 and the respective individual electrode of the inner electrode 25. If the distance between the upper and lower shielding electrodes 26 and the inner electrode 25 changes, this results in a capacitance change, which is due to a force or Pressure at the location of the evaluated single electrode indicates.
  • a serial evaluation of the individual electrodes of the inner electrode 25 a spatial resolution of the tactile capacitive sensor 30 can thus be achieved.
  • the counter electrode 33 is acted upon by means of the connecting line 46 with an AC voltage.
  • the alternating voltage is generated here by a signal generator 45 with respect to the ground potential. Furthermore, the separating electrode 34 is acted upon by the connecting line 47 with an alternating voltage which is derived from the alternating voltage fed to the counter electrode 37.
  • a switching means 48 designed as an operational amplifier is inserted between the connecting line 46 and the connecting line 47. In this way it is ensured that the counter electrode 33 and the separation electrode 34 are at the same potential without a time delay.
  • the evaluation circuit 42 To measure the change in capacitance when an obstacle enters the evaluation circuit 42 is connected by means of a connecting line 43 to the counter electrode 3.
  • the evaluation circuit 42 in this case detects the ratio of capacitance change ⁇ C to the capacitance C.
  • either a measuring bridge can be used or the charging constant can be observed.
  • the plastic strip 37 is still suitable as a surface wave sensor.
  • a surface wave is coupled into the plastic strip 37 via a suitable coupling point.
  • the surface of the plastic strip 37 running surface coupled and its signal strength (amplitude, intensity) and attenuation are detected. If there is a contact between the sensor 30 between the coupling-in point and the coupling-out point, the transmission characteristic or the attenuation of the continuous upper layer changes as a result. surface wave.
  • the evaluation circuit 42 may be designed accordingly.
  • the sensor 30 shown in FIG. 4 is therefore a multisensor which combines the functions of a tactile capacitive sensor, a non-contact capacitive sensor and a sensor based on the principle of surface waves.
  • the sensor 30 thus offers a high reliability and is particularly suitable for the safe detection of an obstacle in the closing path of an actuating element of a motor vehicle.
  • Shielding electrode 46 Connecting line elastic, insulating material 47 connecting line

Landscapes

  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
  • Push-Button Switches (AREA)

Abstract

L'invention concerne un capteur capacitif tactile (11,13,24,30), notamment destiné à détecter un obstacle dans la course d'un élément de réglage (7) d'un véhicule automobile (1), qui comprend une électrode interne (15,25) pouvant être placée sur un potentiel de mesure, une électrode antiparasitage (16, 26) pouvant être placée sur un potentiel de base, écartée de l'électrode interne (15,25) par une matière élastique à isolation électrique (18), et un circuit d'évaluation (42) relié à l'électrode interne (15,25) pour détecter une capacité entre l'électrode interne (15, 25) et l'électrode antiparasitage (16,26). Un capteur de ce type présente une faible sensibilité aux champs parasites extérieurs.
PCT/EP2007/003468 2006-06-12 2007-04-20 Capteur tactile WO2007144040A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200620009189 DE202006009189U1 (de) 2006-06-12 2006-06-12 Taktiler Sensor
DE202006009189.0 2006-06-12

Publications (2)

Publication Number Publication Date
WO2007144040A2 true WO2007144040A2 (fr) 2007-12-21
WO2007144040A3 WO2007144040A3 (fr) 2008-03-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/003468 WO2007144040A2 (fr) 2006-06-12 2007-04-20 Capteur tactile

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Country Link
DE (1) DE202006009189U1 (fr)
WO (1) WO2007144040A2 (fr)

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Publication number Priority date Publication date Assignee Title
DE102007001914A1 (de) * 2007-01-12 2008-07-17 Webasto Ag Vorrichtung zum Überwachen eines Bereiches mit Einklemmgefahr
DE202007016734U1 (de) * 2007-11-30 2009-04-09 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt Einklemmsensor
DE202010011656U1 (de) * 2010-08-21 2011-11-30 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt Kapazitiver Abstandssensor
DE102013104967A1 (de) * 2013-05-14 2014-12-04 Cooper Standard GmbH Schaltleiste, Sicherheitssensorleiste und deren Herstellungsverfahren sowie Einklemmschutz
DE102013019246A1 (de) * 2013-11-15 2015-05-21 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt Vorrichtung zur berührungslosen Betätigung eines Fahrzeugteils

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