EP2131353B1 - Transducteur ultrasonique - Google Patents

Transducteur ultrasonique Download PDF

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Publication number
EP2131353B1
EP2131353B1 EP09012236A EP09012236A EP2131353B1 EP 2131353 B1 EP2131353 B1 EP 2131353B1 EP 09012236 A EP09012236 A EP 09012236A EP 09012236 A EP09012236 A EP 09012236A EP 2131353 B1 EP2131353 B1 EP 2131353B1
Authority
EP
European Patent Office
Prior art keywords
housing
converter housing
converter
ultrasonic
sensor
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.)
Active
Application number
EP09012236A
Other languages
German (de)
English (en)
Other versions
EP2131353A1 (fr
Inventor
Jürgen Patz
Thomas Merk
Jörg Klaiber
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.)
Leuze Electronic GmbH and Co KG
Original Assignee
Leuze Electronic 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
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Application filed by Leuze Electronic GmbH and Co KG filed Critical Leuze Electronic GmbH and Co KG
Publication of EP2131353A1 publication Critical patent/EP2131353A1/fr
Application granted granted Critical
Publication of EP2131353B1 publication Critical patent/EP2131353B1/fr
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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device

Definitions

  • the invention relates to an ultrasonic transducer.
  • Such ultrasonic transducers are used in particular in ultrasonic sensors which are used for object detection.
  • such an ultrasound sensor as ultrasound transducer has at least one emitter emitting ultrasonic waves and a receiver receiving ultrasound waves.
  • the received signals present at the output of the receiver are evaluated in an evaluation unit. If the ultrasonic sensor operates according to the reflection principle, the proportion of ultrasonic waves emitted by the transmitter, which are reflected back by an object, is determined in the evaluation unit from the received signals.
  • the proportion of ultrasonic waves emitted by the transmitter which penetrate an object structure to be detected, is determined in the evaluation unit from the received signals.
  • multi-layered object structures can be detected in this way.
  • Such an ultrasonic sensor is in the DE 199 21 217 A1 described. This ultrasonic sensor is used to detect labels on carrier materials.
  • the transmitter and the receiver In known ultrasonic sensors of this type, the transmitter and the receiver must each be installed in a sensor housing and aligned during installation within the housing, that is to be adjusted.
  • the transmitter and the receiver also have connection cables that must be contacted to electronic components. In addition, these connection cables must be shielded in order to realize protection against electromagnetic interference.
  • the transmitter and the receiver of such an ultrasonic sensor form in each case an ultrasonic transducer with a piezoelectric element which can generate or receive ultrasonic waves. This piezoelectric element is integrated in a converter housing consisting of metal or hard plastic.
  • the transducer housing must be encased at least with a foam material.
  • the resonance space within the transducer housing of an ultrasonic transducer must be filled with soft filling material.
  • an ultrasonic transducer which comprises a converter housing made of plastic.
  • this converter housing another plastic body is injected, which carries a piezoelectric element.
  • the EP 0 283 823 A1 relates to an ultrasonic head including a device with an ultrasonic vibrator and an electrical signal generator for acting on the ultrasonic transducer of the ultrasonic head with electrical signals so that the electrical signals are converted to radiated ultrasound. Furthermore, an adaptation device for adapting an inserted ultrasound head to the electrical signal generator is provided.
  • the adjustment device comprises an easily replaceable adjustment member, which is assigned to a likewise easily replaceable ultrasonic transducer suitable and interchangeable in the ultrasonic head, when the ultrasonic transducer is replaced.
  • the DE 20 2005 006 831 U1 relates to an ultrasonic sensor having an ultrasonic transmitter emitting ultrasonic waves and an ultrasonic receiver receiving ultrasonic waves, which are integrated in at least one housing.
  • the ultrasonic transmitter and the ultrasonic receiver are each sheathed with a layer of sound-deadening foam-like material which lies in a metal sleeve which can be inserted into an opening of the housing.
  • the invention has for its object to provide an ultrasonic transducer of the type mentioned, which is simple and inexpensive to produce with high functionality.
  • the ultrasonic transducer serves to form a transmitter emitting ultrasonic waves and / or a receiver receiving ultrasonic waves, in particular for an ultrasonic sensor, and has a converter housing made of soft material which forms a means for structure-borne sound decoupling.
  • the ultrasound transducer housing itself forms a means of structure-borne sound decoupling by the formation of soft material
  • the ultrasound transducer thus formed can be mounted without an additional shell of foam material in an external unit, in particular in the sensor housing of the ultrasound sensor.
  • the resonant space in the interior of the converter housing is no longer filled with soft filling material must become. Rather, the interior of the transducer housing can be left as a cavity through which Anschusslitzen a piezoelectric element can be performed.
  • the piezoelectric element itself which forms a medium for transmitting or receiving ultrasonic waves and on which preferably a matching layer is applied, can be mounted on the transducer housing simply by being inserted into a groove of the transducer housing.
  • the pigtails are first inserted into the cavity of the transducer housing and then passed through an opening at the back of the transducer housing, so that the free ends of the pigtails protrude beyond the transducer housing. Then, the piezoelectric element is inserted into the groove so that it closes the open front side of the converter housing tight, that is, no additional sealing means for sealing the converter housing is needed.
  • peripheral wall of the sleeve-shaped converter housing forming the peripheral surface of the converter housing is provided in the circumferential direction of the converter housing and at the rear Ausmündende recess into which a metallic shielding sleeve is inserted.
  • the shielding sleeve serves not only to shield the transducer housing, but also to shield the connecting leads, since the shielding sleeve protrudes beyond the rear end of the transducer housing and thus shields the exposed ends of the connecting leads.
  • the rear, free edge of the shielding sleeve forms an adapter for mounting the ultrasonic transducer to an external unit.
  • the transducer housing and the shielding sleeve of the respective ultrasonic transducer are designed so that they can be inserted precisely into the receptacles of the sensor housing.
  • the connecting leads of the ultrasonic transducers are connected to the printed circuit board directly or via connection lines. Because the converter housing every Ultrasonic transducer itself form the means for structure-borne sound decoupling, no separate means need to be provided for this purpose.
  • the shielding of the ultrasonic transducer forming the receiver is designed so that it can be snapped onto the circuit board.
  • the shape of the shielding sleeve is designed so that after latching on the circuit board of the receiver formed by this ultrasonic transducer is in its correct nominal position in the sensor housing.
  • FIG. 1 shows an exemplary embodiment of an ultrasonic sensor 1 for detecting objects.
  • the ultrasonic sensor 1 can be used in particular for the detection of multi-layered object structures. For example, with the ultrasonic sensor 1 labels on carrier materials can be detected. Furthermore, with the ultrasonic sensor 1, a double sheet control such can be made that single sheets of double sheets, that is two superimposed sheets, can be distinguished.
  • the components of the ultrasonic sensor 1 are integrated in a fork-shaped sensor housing 2.
  • the sensor housing 2 is preferably made of plastic.
  • the sensor housing 2 has a housing body 3 and a housing cover 4, wherein the housing cover 4 is connected via a film hinge 5, so that the sensor housing 2 is integrally formed.
  • the sensor housing 2 is fork-shaped and has two parallel spaced-apart fork arms 2a, 2b. A cross section through the sensor housing 2 in the region of the fork arms 2a, 2b is in FIG. 2 shown
  • the ultrasonic sensor 1 has an ultrasonic wave emitting transmitter 6 and an ultrasonic wave receiving receiver 7. Furthermore, a printed circuit board 8 is provided, on which the electronic components of a transmitter are provided.
  • the sensor housing 2 is completed laterally with the housing cover 4. When the housing cover 4 is open, a lateral housing opening of the housing body 3 is exposed. About this housing opening, the components of the ultrasonic sensor 1 are inserted into the housing body 3 and inserted there in recordings that are formed by opening out at the housing opening cavities of the housing body 3, fit.
  • the recordings are designed so that the printed circuit board 8 and in particular the transmitter 6 and receiver 7 are already arranged exactly in their desired positions in the sensor housing 2 after insertion into these recordings, so that no alignment of these components within the sensor housing 2 is required.
  • the printed circuit board 8 with the associated sensor components, that is, the transmitter 6 and receiver 7, is in FIG. 3 presented in a single representation. While the receiver 7 is seated directly on the underside of the circuit board 8 and fixed there, the transmitter 6 via a connecting line 9 with the Printed circuit board 8 connected. At the top of the circuit board 8, the receiver 7 opposite, a shield plate 10 is attached to the receiver 7, in particular the amplifier of the receiver 7, to protect against electromagnetic interference. On the circuit board 8 also sits on a pin header 11 as an electrical connection means. Alternatively, a plug may be provided.
  • FIG. 1 it can be seen that the transmitter 6 is arranged in the lower fork arm 2a opposite the receiver 7 in the upper fork arm 2b, so that their axes A coincide.
  • the axes A of the transmitter 6 and the receiver 7 are inclined by an inclination angle to the perpendicular to the longitudinal axes of the fork arms 2a, 2b.
  • the conveying direction of the objects is perpendicular to the plane of the drawing.
  • the detection of objects takes place in such a way that the transmitter 6 emits ultrasonic waves along the axis A in the direction of the receiver 7, the ultrasonic waves correspondingly being weakened when passing through an object.
  • an object detection signal is generated in response to the received signals and output via an integrated in the connection means output.
  • a threshold value judgment of the received signals becomes a binary object detection signal whose switching states specify whether a single arc or a double arc has been detected.
  • a corresponding binary object detection signal is generated during the detection of labels on carrier materials.
  • the mutually facing sides of the fork arms of the sensor housing 2, at which the exit surfaces of the transmitter 6 and the receiver 7 open convex.
  • these housing surfaces have two peripheral to the center pointed peripheral surfaces. Also rounded training of the housing surfaces are possible. This ensures that the part of the ultrasonic waves emitted by the transmitter 6 penetrates an object to be detected and does not strike the receiver 7 but the adjacent housing wall, is not reflected to the transmitter 6 or from there back to the receiver 7. This prevents erroneous measurements caused by back reflections of the ultrasonic waves.
  • the probability of detection of the ultrasound sensor 1 can be further increased by placing an aperture 12 in front of the transmitter 6 and / or in front of the receiver 7. How out FIG. 2 can be seen, recesses 13 are provided in the fork arms 2a, 2b of the sensor housing 2, so that the panels 12 can be snapped onto the fork arms 2a, 2b.
  • FIG. 4 shows the structure of an ultrasonic transducer 14, which forms the receiver 7 of the ultrasonic sensor 1 in the present case.
  • the transmitter 6 of the ultrasonic sensor 1 is formed by a corresponding ultrasonic transducer 14.
  • the ultrasonic transducer 14 according to FIG. 4 has a transducer housing 15, which consists of soft material, preferably made of soft plastic such as TPE, and thus itself forms a means for structure-borne sound decoupling.
  • the converter housing 15 is sleeve-shaped and has an open front side and a largely closed rear side with a central opening 16 arranged there.
  • the ultrasonic transducer 14 further comprises a piezoelectric element 17 in the form of a metal-coated ceramic. From the metal coating on the back of the piezoelectric element 17 lead wires 18 away. On the front side of the piezoelectric element 17, a matching layer 19 is applied, which ensures an adaptation of the transition between the piezoelectric element 17 and the arranged air layer and thus causes an efficient coupling of the ultrasonic waves to be received.
  • the connecting leads 18 are inserted into the resonant space bounded by the transducer housing 15, which in the present case is a cavity filled only with air, and then passed through the rear opening 16 of the transducer housing 15, so that the free ends of the connecting leads 18 beyond the transducer housing 15 also protrude. Then, the piezoelectric element 17 is locked with the matching layer 19 in a groove 20 which rotates on the inner wall of the converter housing 15 in the region of the open front side of the converter housing 15 in the circumferential direction. By the engagement of the piezoelectric element 17 with the matching layer 19 in the groove 20, the open front side of the transducer housing 15 is completed and the resonance chamber sealed to the outside. To improve the chemical resistance, the matching layer 19 may be coated with a parylene layer or the like.
  • FIG. 4 As can be seen, the rear part of the shielding sleeve projects beyond the transducer housing 15 of the ultrasound transducer 14.
  • the free edge of the shielding sleeve is thereby bevelled so that when the shielding sleeve is placed on the printed circuit board 8 of the ultrasonic sensor 1, the ultrasonic transducer 14, that is to say the receiver 7, is mounted at the correct angle of inclination in the sensor housing 2 is.
  • For fixing to the printed circuit board 8 are from the edge of the shielding sleeve locking lugs out, which can be snapped into holes in the circuit board 8.
  • the protruding over the transducer housing 15 part of the shielding sleeve forms a shield for the connecting wires 18 so that they do not need to be shielded separately.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Claims (3)

  1. Transducteur ultrasonique permettant de réaliser un émetteur (6) émettant des ondes ultrasonores et/ou un récepteur (7) recevant des ondes ultrasonores, comportant un boîtier de transducteur (15) et un élément piézoélectrique (17), le boîtier de transducteur (15) étant réalisé dans un matériau souple qui forme un moyen de découplage du bruit solidien, caractérisé en ce que le boîtier de transducteur (15) présente une rainure (20) dans laquelle l'élément piézoélectrique (17) peut être engagé, que le boîtier de transducteur (15) présente la forme d'un manchon avec une ouverture frontale, l'ouverture étant obturée par l'élément piézoélectrique (17), que les segments de paroi du boîtier de transducteur (15) se raccordant à l'élément piézoélectrique (17) renferment une cavité qui forme une chambre de résonance, que dans la chambre de résonance s'étendent des fils de connexion (18) de l'élément piézoélectrique (17), lesquels sortent de celle-ci par une ouverture arrière du boîtier de transducteur (15), qu'il est prévu dans la paroi formant la surface d'enveloppe du boîtier de transducteur (15) en forme de manchon un évidement s'étendant en direction circonférentielle du boîtier de transducteur (15) et débouchant sur sa face arrière, dans lequel un manchon de blindage métallique peut être inséré, le manchon de blindage formant un blindage pour les fils de connexion (18), et que le boîtier de transducteur (15) et le manchon de blindage sont conçus de façon à pouvoir être insérés en parfait ajustement dans les logements d'un boîtier de capteur.
  2. Transducteur ultrasonique selon la revendication 1, caractérisé en ce qu'une couche d'adaptation (19) est prévue sur l'élément piézoélectrique (17), laquelle peut être engagée avec l'élément piézoélectrique (17) dans la rainure (20) du boîtier de transducteur (15).
  3. Transducteur ultrasonique selon la revendication 1 ou 2, caractérisé en ce que le bord libre, dépassant du boîtier de transducteur (15), du manchon de blindage peut être encliqueté sur une carte de circuits imprimés (8) d'un capteur ultrasonique (1), la forme du manchon de blindage étant conçue de façon que l'axe du transducteur ultrasonique (14) soit correctement aligné à l'intérieur du capteur ultrasonique (1) après encliquetage du manchon de blindage sur la carte de circuits imprimés (8) disposée dans le capteur ultrasonique (1).
EP09012236A 2008-05-10 2009-04-15 Transducteur ultrasonique Active EP2131353B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810023187 DE102008023187A1 (de) 2008-05-10 2008-05-10 Ultraschallsensor
EP20090005354 EP2116474B1 (fr) 2008-05-10 2009-04-15 Capteur d'ultrasons

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP09005354.7 Division 2009-04-15
EP20090005354 Division EP2116474B1 (fr) 2008-05-10 2009-04-15 Capteur d'ultrasons

Publications (2)

Publication Number Publication Date
EP2131353A1 EP2131353A1 (fr) 2009-12-09
EP2131353B1 true EP2131353B1 (fr) 2010-10-06

Family

ID=40863519

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20090005354 Revoked EP2116474B1 (fr) 2008-05-10 2009-04-15 Capteur d'ultrasons
EP09012236A Active EP2131353B1 (fr) 2008-05-10 2009-04-15 Transducteur ultrasonique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20090005354 Revoked EP2116474B1 (fr) 2008-05-10 2009-04-15 Capteur d'ultrasons

Country Status (2)

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EP (2) EP2116474B1 (fr)
DE (3) DE102008023187A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010016425U1 (de) * 2010-05-19 2011-04-07 Leuze Electronic Gmbh + Co. Kg Sensor
DE202010011113U1 (de) * 2010-08-05 2010-11-04 Leuze Electronic Gmbh + Co. Kg Ultraschallsensor
EP3547456A1 (fr) * 2018-03-27 2019-10-02 Leuze electronic GmbH + Co. KG Capteur
CN108502841A (zh) * 2018-05-04 2018-09-07 李扬渊 一种能够实现超声波传感的电子设备及其制造方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3860719D1 (de) 1987-03-20 1990-11-08 Siemens Ag Geraet zur erzeugung und abstrahlung von ultraschall,insbesondre fuer ultraschall-therapie.
FR2783915A1 (fr) 1998-09-28 2000-03-31 Schlumberger Ind Sa Transducteur ultrasonore
DE19921217B4 (de) 1999-05-07 2004-11-25 Leuze Electronic Gmbh + Co Kg Vorrichtung zur Detektion von Etiketten
DE102004051326B4 (de) * 2004-10-21 2007-05-24 Leuze Electronic Gmbh & Co Kg Gehäuse für Lichtschranken, Reflexionslichtschranken, Lichttester oder Distanzsensoren
DE202005006831U1 (de) 2005-04-29 2005-07-07 Leuze Electronic Gmbh & Co Kg Ultraschallsensor
JP4995438B2 (ja) * 2005-06-14 2012-08-08 株式会社キーエンス 反射型光電スイッチ
DE202007002864U1 (de) 2007-02-27 2007-07-05 Pepperl + Fuchs Gmbh Gabelgehäuse, insbesondere für Licht- oder Ultraschallschranken

Also Published As

Publication number Publication date
EP2131353A1 (fr) 2009-12-09
DE502009000016D1 (de) 2010-06-17
EP2116474A1 (fr) 2009-11-11
DE102008023187A1 (de) 2009-11-19
EP2116474B1 (fr) 2010-05-05
DE502009000121D1 (de) 2010-11-18

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