EP1064645B1 - Ultrasonic transducer - Google Patents

Ultrasonic transducer Download PDF

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Publication number
EP1064645B1
EP1064645B1 EP98959707A EP98959707A EP1064645B1 EP 1064645 B1 EP1064645 B1 EP 1064645B1 EP 98959707 A EP98959707 A EP 98959707A EP 98959707 A EP98959707 A EP 98959707A EP 1064645 B1 EP1064645 B1 EP 1064645B1
Authority
EP
European Patent Office
Prior art keywords
housing
ultrasonic converter
converter according
bowl
ring
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.)
Expired - Lifetime
Application number
EP98959707A
Other languages
German (de)
French (fr)
Other versions
EP1064645A2 (en
Inventor
Herbert Arnold
Dieter Karr
Meike Fehse
Peter Rapps
Waldemar Ernst
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1064645A2 publication Critical patent/EP1064645A2/en
Application granted granted Critical
Publication of EP1064645B1 publication Critical patent/EP1064645B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
    • 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
    • G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general

Definitions

  • the invention is based on an ultrasonic transducer with a pot-like housing with an annular wall and a bottom surface as a membrane, with the On the inside of the bottom surface, a piezo element is applied, which has connection lines connected is.
  • An ultrasonic transducer is known from EP 0 075 302 B1, which has a cup-shaped housing having. Such ultrasonic transducers are used, for example, as sensors for Distance measuring devices used.
  • EP 477 575 A1 describes an ultrasonic transducer and a method for producing the Ultrasonic transducer is known, in which with the help of different shapes to one Piezoceramic disc a pourable matching material is arranged, which is a pot formed. The piezoceramic disc is contacted by wires that are connected by a poured damping material run and open into a connector. The In one embodiment, damping material forms a ring for holding.
  • DE 34 41 684 A1 describes an electroacoustic transducer with an aluminum pot and a piezoceramic disk arranged thereon, which is connected via flexible wires a circuit board is contacted. Is on a housing made of an elastic material arranged a connector that leads out of the housing. There is a on the aluminum pot Ring arranged for holding in the elastic material.
  • the object of the present invention is to provide an ultrasonic transducer stable contact for secure mounting.
  • the edge facing away from the bottom surface is surrounded by a decoupling ring and that the decoupling ring is designed as a holder for the connecting lines.
  • the annular wall of the pot-like housing has a contour that is rises above the outside of the annular wall of the pot-like housing, the decoupling ring on the outside corresponding to this contour Has contour for secure attachment of the ultrasonic transducer to an opening.
  • a first advantageous embodiment of the Ultrasonic transducer according to the invention is that the Decoupling ring essentially fills the housing and provided with holes to hold the connecting cables is.
  • the Decoupling ring has a central opening at the Edge grooves arranged to hold the connection lines are. It is advantageous if one of them is not Decoupling part of the interior of the Housing including the central opening with a Damping material is filled.
  • An advantageous embodiment of the invention Ultrasonic transducer is that the connecting lines are flexible.
  • the flexible Connection lines for example formed by strands is still an easy assembly of the Ultrasonic transducer according to the invention on a circuit board possible, the connecting cables through the bracket in the holes arranged in the respective grid dimension fit.
  • the connecting lines held in the decoupling ring rigidly formed and with flexible pipe sections with the Piezo element are connected.
  • this one Design provided that the decoupling ring except the Holes for holding the connection lines an opening and that the opening and one not of that Decoupling part of the interior of the Housing are filled with a damping material.
  • the figures show the exemplary embodiments in one view from the direction of radiation or Receiving direction (a) and a plan view of the Connection side (b) and each as a longitudinal section (c) or (d).
  • the illustrated embodiments each contain one, for example made of aluminum, Sensor transducer pot 1, on the bottom of which the piezo element 2 attached, for example glued.
  • a decoupling ring 4, 6, 9 made of elastic material, preferably made of silicone, provided the edge of the Converter pot 1 includes.
  • a corresponding contour of the transducer pot 1 and on the Outside of the decoupling ring 4, 6, 9 is used for secure attachment by simple Press into a corresponding opening of the body part, not shown.
  • connecting strands 3 with the piezo element 2 contacted.
  • the decoupling ring 4 comprises a central opening, at the edge of which grooves are provided for holding the connecting strands 3.
  • the remaining cavities are filled with a damping material 5, for example with a silicone foam.
  • the decoupling ring 6 is designed such that it occupies the entire interior of the sensor pot 1.
  • a bore running through the entire decoupling ring 6 is provided in each case.

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

Description

Die Erfindung geht aus von einem Ultraschallwandler mit einem topfähnlichen Gehäuse mit einer ringförmigen Wandung und einer Bodenfläche als Membran, wobei an der Innenseite der Bodenfläche ein Piezoelement aufgebracht ist, das mit Anschlussleitungen verbunden ist.The invention is based on an ultrasonic transducer with a pot-like housing with an annular wall and a bottom surface as a membrane, with the On the inside of the bottom surface, a piezo element is applied, which has connection lines connected is.

Aus EP 0 075 302 B1 ist ein Ultraschallwandler bekannt, der ein topfförmiges Gehäuse aufweist. Derartige Ultraschallwandler werden beispielsweise als Sensoren für Abstandsmessgeräte verwendet.An ultrasonic transducer is known from EP 0 075 302 B1, which has a cup-shaped housing having. Such ultrasonic transducers are used, for example, as sensors for Distance measuring devices used.

Aus der EP 477 575 A1 ist ein Ulträschallwandler und ein Verfahren zur Herstellung des Ultraschallwandlers bekannt, bei dem mit Hilfe verschiedener Formen an eine Piezokeramikscheibe ein gießbares Anpassmaterial angeordnet wird, das einen Topf ausbildet. Die Piezokeramikscheibe wird durch Drähte kontaktiert, die durch ein gegossenes Dämpfungsmaterial verlaufen und in einen Anschlussstecker münden. Das Dämpfungsmaterial bildet in einer Ausführungsform einen Kranz zur Halterung aus.EP 477 575 A1 describes an ultrasonic transducer and a method for producing the Ultrasonic transducer is known, in which with the help of different shapes to one Piezoceramic disc a pourable matching material is arranged, which is a pot formed. The piezoceramic disc is contacted by wires that are connected by a poured damping material run and open into a connector. The In one embodiment, damping material forms a ring for holding.

Aus der DE 34 41 684 A1 ist ein elektroakustischer Wandler mit einem Aluminiumtopf und einer daran angeordnete Piezokeramikscheibe bekannt, die über flexible Drähte zu einer Leiterplatte kontaktiert wird. An einem Gehäuse aus einem elastischen Material ist ein Stecker angeordnet, der aus dem Gehäuse hinausführt. An dem Aluminiumtopf ist ein Ring zur Halterung in dem elastischen Material angeordnet.DE 34 41 684 A1 describes an electroacoustic transducer with an aluminum pot and a piezoceramic disk arranged thereon, which is connected via flexible wires a circuit board is contacted. Is on a housing made of an elastic material arranged a connector that leads out of the housing. There is a on the aluminum pot Ring arranged for holding in the elastic material.

Aufgabe der vorliegenden Erfindung ist es, einen Ultraschallwandler anzugeben mit stabiler montagegerechter Kontaktierung zur sicheren Halterung.The object of the present invention is to provide an ultrasonic transducer stable contact for secure mounting.

Diese Aufgabe wird bei dem erfindungsgemäßen Ultraschallwandler dadurch gelöst, dass der von der Bodenfläche abgewandte Rand von einem Entkopplungsring umgeben ist und dass der Entkopplungsring als Halter für die Anschlussleitungen ausgebildet ist. Femer weist die ringförmige Wandung des topfähnlichen Gehäuses eine Kontur auf, die sich über die Außenseite der ringförmigen Wandung des topfähnlichen Gehäuses erhebt, wobei der Entkopplungsring an seiner Außenseite eine dieser Kontur entsprechende Kontur zur sicheren Befestigung des Ultraschallwandlers an einer Öffnung aufweist. This object is achieved in the ultrasonic transducer according to the invention in that the edge facing away from the bottom surface is surrounded by a decoupling ring and that the decoupling ring is designed as a holder for the connecting lines. furthermore the annular wall of the pot-like housing has a contour that is rises above the outside of the annular wall of the pot-like housing, the decoupling ring on the outside corresponding to this contour Has contour for secure attachment of the ultrasonic transducer to an opening.

Eine erste vorteilhafte Ausführungsform des erfindungsgemäßen Ultraschallwandlers besteht darin, daß der Entkopplungsring das Gehäuse im wesentlichen ausfüllt und mit Bohrungen zur Halterung der Anschlußleitungen versehen ist.A first advantageous embodiment of the Ultrasonic transducer according to the invention is that the Decoupling ring essentially fills the housing and provided with holes to hold the connecting cables is.

Bei einer zweiten Ausführungsform ist vorgesehen, daß der Entkopplungsring eine zentrale Öffnung aufweist, an deren Rand Nuten zur Halterung der Anschluβleitungen angeordnet sind. Dabei ist es vorteilhaft, wenn ein nicht von dem Entkopplungsring eingenommener Teil des Innenraums des Gehäuses einschließlich der zentralen Öffnung mit einem Dämpfungsmaterial ausgefüllt ist.In a second embodiment it is provided that the Decoupling ring has a central opening at the Edge grooves arranged to hold the connection lines are. It is advantageous if one of them is not Decoupling part of the interior of the Housing including the central opening with a Damping material is filled.

Eine vorteilhafte Ausgestaltung des erfindungsgemäßen Ultraschallwandlers besteht darin, daß die Anschlußleitungen flexibel ausgebildet sind. Durch die Halterung der flexiblen Anschlußleitungen, die beispielsweise von Litzen gebildet werden, ist trotzdem eine einfache Montage des erfindungsgemäßen Ultraschallwandlers auf einer Leiterplatte möglich, wobei die Anschlußleitungen durch die Halterung in die im jeweils vorgesehenen Rastermaß angeordneten Bohrungen passen.An advantageous embodiment of the invention Ultrasonic transducer is that the connecting lines are flexible. By holding the flexible Connection lines, for example formed by strands is still an easy assembly of the Ultrasonic transducer according to the invention on a circuit board possible, the connecting cables through the bracket in the holes arranged in the respective grid dimension fit.

Bei einer anderen vorteilhaften Ausgestaltung des erfindungsgemäßen Ultraschallwandlers ist vorgesehen, daß die in dem Entkopplungsring gehaltenen Anschlußleitungen starr ausgebildet und über flexible Leitungsstücke mit dem Piezoelement verbunden sind. Hierbei ist ebenfalls eine einfache Montage gewährleistet. Vorzugsweise ist bei dieser Ausgestaltung vorgesehen, daß der Entkopplungsring außer den Bohrungen zur Halterung der Anschlußleitungen eine Öffnung aufweist und daß die Öffnung und ein nicht von dem Entkopplungsring eingenommener Teil des Innenraums des Gehäuses mit einem Dämpfungsmateriel ausgefüllt sind. In another advantageous embodiment of the Ultrasonic transducer according to the invention is provided that the connecting lines held in the decoupling ring rigidly formed and with flexible pipe sections with the Piezo element are connected. Here is also one easy assembly guaranteed. Preferably this one Design provided that the decoupling ring except the Holes for holding the connection lines an opening and that the opening and one not of that Decoupling part of the interior of the Housing are filled with a damping material.

Bei dieser Ausgestaltung können die starren Anschlußleitungenen gerade herausgeführt oder außerhalb des Gehäuses um 90° abgebogen sein.In this configuration, the rigid Connection lines just led out or outside the Be bent by 90 °.

Um trotz der elastischen Eigenschaften des Entkopplungsringes die Lage der Anschlußleitungen bzw. deren Abstand genau einzuhalten, kann gemäß einer Weiterbildung vorgesehen sein, daß die Anschlußleitungen an der Oberfläche des Entkopplungsringes von einem, vorzugsweise ringförmig ausgebildeten Steg gehalten werden.Despite the elastic properties of the Decoupling ring the position of the connecting lines or their According to further training, it is possible to keep the distance exactly be provided that the connecting lines on the surface the decoupling ring of one, preferably annular trained web are held.

Ausführungsbeispiele der Erfindung sind in der Zeichnung anhand mehrerer Figuren dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigt:

Fig. 1
ein erstes Ausführungsbeispiel in vier Ansichten,
Fig. 2
ein zweites Ausführungsbeispiel in vier Ansichten und
Fig. 3
ein drittes Ausführungsbeispiel in drei Ansichten.
Exemplary embodiments of the invention are shown in the drawing using several figures and are explained in more detail in the following description. It shows:
Fig. 1
a first embodiment in four views,
Fig. 2
a second embodiment in four views
Fig. 3
a third embodiment in three views.

Gleiche Teile sind in den Figuren mit gleichen Bezugszeichen versehen. Die Figuren zeigen die Ausführungsbeispiele in jeweils einer Ansicht aus der Abstrahlrichtung bzw. Empfangsrichtung (a) und einer Draufsicht von der Anschlußseite (b) und jeweils als Längsschnitt (c) bzw. (d).Identical parts are given the same reference symbols in the figures Mistake. The figures show the exemplary embodiments in one view from the direction of radiation or Receiving direction (a) and a plan view of the Connection side (b) and each as a longitudinal section (c) or (d).

Die dargestellten Ausführungsbeispiele enthalten jeweils einen, beispielsweise aus Aluminium bestehenden, Sensorwandlertopf 1, an dessen Boden innen das Piezoelement 2 befestigt, beispielsweise eingeklebt ist. Zur Montage des Ultraschallwandlers in einem feststehenden Teil, beispielsweise in einen Teil eine Kraftfahrzeugkarosserie, ist ein Entkopplungsring 4, 6, 9 aus elastischem Material, vorzugsweise aus Silikon, vorgesehen, der den Rand des Wandlertopfes 1 umfasst. Eine entsprechende Kontur des Wandlertopfes 1 sowie an der Außenseite des Entkopplungsringes 4, 6, 9 dient zur sicheren Befestigung durch einfaches Eindrücken in eine entsprechende Öffnung des nicht dargestellten Karosserieteils.The illustrated embodiments each contain one, for example made of aluminum, Sensor transducer pot 1, on the bottom of which the piezo element 2 attached, for example glued. To assemble the Ultrasonic transducer in a fixed part, for example in a part of a motor vehicle body, is a decoupling ring 4, 6, 9 made of elastic material, preferably made of silicone, provided the edge of the Converter pot 1 includes. A corresponding contour of the transducer pot 1 and on the Outside of the decoupling ring 4, 6, 9 is used for secure attachment by simple Press into a corresponding opening of the body part, not shown.

Bei dem Ausführungsbeispiel nach Fig. 1 sind Anschlusslitzen 3 mit dem Piezoelement 2 kontaktiert. Der Entkopplungsring 4 umfasst eine zentrale Öffnung, an deren Rand Nuten zur Halterung der Anschlusslitzen 3 vorgesehen sind. Die verbleibenden Hohlräume sind mit einem Dämpfungsmaterial 5, beispielsweise mit einem Silikonschaum, ausgefüllt.In the exemplary embodiment according to FIG. 1, connecting strands 3 with the piezo element 2 contacted. The decoupling ring 4 comprises a central opening, at the edge of which grooves are provided for holding the connecting strands 3. The remaining cavities are filled with a damping material 5, for example with a silicone foam.

Bei dem Ausführungsbeispiel nach Fig. 2 ist der Entkopplungsring 6 derart ausgebildet, dass erden gesamten Innenraum des Sensortopfes 1 einnimmt. Für die Anschlusslitzen 3 ist jeweils eine den gesamten Entkopplungsring 6 durchlaufende Bohrung vorgesehen.2, the decoupling ring 6 is designed such that it occupies the entire interior of the sensor pot 1. For the stranded wires 3 a bore running through the entire decoupling ring 6 is provided in each case.

Bei dem Ausführungsbeispiel nach Fig. 3 sind zwei starre Anschlussleitungen 8 vorgesehen, die über jeweils eine flexible Leitung 7 mit dem Piezoelement 2 verbunden sind. Die starren Anschlussleitungen 8 werden wiederum in dem Entkopplungsring 9 gehalten, wobei ein zusätzlicher Steg 10 aus werkstoffgeringer Elastizität die Anschlussleitungen 8 zusätzlich fixiert. Auch bei dem Ausführungsbeispiel nach Fig. 3 sind die Hohlräume mit einem Dämpfungsmaterial 11 ausgefüllt.3 are two rigid connecting lines 8 provided, each connected to the piezo element 2 via a flexible line 7 are. The rigid connecting lines 8 are in turn in the decoupling ring 9 held, with an additional web 10 of low material elasticity Connection lines 8 additionally fixed. Also in the embodiment according to FIG. 3 the cavities are filled with a damping material 11.

Claims (10)

  1. Ultrasonic converter with a bowl-like housing (1) having an annular wall and a bottom surface as a diaphragm, there being attached to the inside of the bottom surface a piezoelectric element (2) which is connected to junction leads (3, 7, 8), that edge of the bowl-like housing which faces away from the bottom surface being framed by an uncoupling ring (4, 6, 9), the uncoupling ring (4, 6, 9) being designed as a holder for the junction leads (3, 8), characterized in that the annular wall of the bowl-like housing (1) has a contour which is elevated beyond the outside of the annular wall of the bowl-like housing (1), and in that the uncoupling ring (4, 6, 9) has on its outside a contour corresponding to this contour for the secure fastening of the ultrasonic converter in an orifice.
  2. Ultrasonic converter according to Claim 1, characterized in that the bowl-like housing consists of aluminium.
  3. Ultrasonic converter according to one of the preceding claims, characterized in that the uncoupling ring (6) essentially fills the housing (1) and is provided with bores for holding the junction leads (3).
  4. Ultrasonic converter according to one of Claims 1 and 2, characterized in that the uncoupling ring (4) has a central orifice, at the edge of which are arranged grooves for holding the junction leads (3).
  5. Ultrasonic converter according to Claim 4, characterized in that a part of the interior of the bowl-like housing (1) which is not occupied by the uncoupling ring (4), including the central orifice, is filled with a damping material (5).
  6. Ultrasonic converter according to one of the preceding claims, characterized in that the junction leads (3) are of flexible design.
  7. Ultrasonic converter according to one of Claims 1 or 2, characterized in that the junction leads (8) held in the uncoupling ring (9) are of rigid design and are connected to the piezoelectric element (2) via flexible lead pieces (7).
  8. Ultrasonic converter according to Claim 7, characterized in that the uncoupling ring (9) has an orifice, in addition to the bores, for holding the junction leads (8) , and in that the orifice and a part of the interior of the bowl-shaped housing (1) which is not occupied by the uncoupling ring (9) are filled with a damping material (11).
  9. Ultrasonic converter according to one of Claims 7 or 8, characterized in that the rigid junction leads (8) are bent through 90° outside the bowl-shaped housing (1).
  10. Ultrasonic converter according to one of the preceding claims, characterized in that the junction leads (8) are held on the surface of the uncoupling ring (9) by a preferably annularly designed web (10).
EP98959707A 1997-10-07 1998-10-05 Ultrasonic transducer Expired - Lifetime EP1064645B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19744229 1997-10-07
DE19744229A DE19744229A1 (en) 1997-10-07 1997-10-07 Ultrasonic transducer
PCT/DE1998/002938 WO1999018563A2 (en) 1997-10-07 1998-10-05 Ultrasonic transducer

Publications (2)

Publication Number Publication Date
EP1064645A2 EP1064645A2 (en) 2001-01-03
EP1064645B1 true EP1064645B1 (en) 2003-09-24

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EP98959707A Expired - Lifetime EP1064645B1 (en) 1997-10-07 1998-10-05 Ultrasonic transducer

Country Status (4)

Country Link
US (1) US6374676B1 (en)
EP (1) EP1064645B1 (en)
DE (2) DE19744229A1 (en)
WO (1) WO1999018563A2 (en)

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Publication number Publication date
DE19744229A1 (en) 1999-04-29
US6374676B1 (en) 2002-04-23
WO1999018563A3 (en) 1999-06-10
WO1999018563A2 (en) 1999-04-15
DE59809750D1 (en) 2003-10-30
EP1064645A2 (en) 2001-01-03

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