EP1064645A2 - Ultrasonic transducer - Google Patents

Ultrasonic transducer

Info

Publication number
EP1064645A2
EP1064645A2 EP98959707A EP98959707A EP1064645A2 EP 1064645 A2 EP1064645 A2 EP 1064645A2 EP 98959707 A EP98959707 A EP 98959707A EP 98959707 A EP98959707 A EP 98959707A EP 1064645 A2 EP1064645 A2 EP 1064645A2
Authority
EP
European Patent Office
Prior art keywords
ultrasonic transducer
decoupling ring
connecting lines
transducer according
housing
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.)
Granted
Application number
EP98959707A
Other languages
German (de)
French (fr)
Other versions
EP1064645B1 (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

Links

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 cup-like housing with an annular wall and a bottom surface as a membrane, a piezo element being attached to the inside of the bottom surface and being connected to connecting lines.
  • An ultrasonic transducer is known from EP 0 075 302 B1, which has a cup-shaped housing. Such ultrasonic transducers are used, for example, as sensors for distance measuring devices.
  • the object of the present invention is to provide an ultrasonic transducer with stable, assembly-compatible contacting.
  • a first advantageous embodiment of the ultrasonic transducer according to the invention consists in that the decoupling ring essentially fills the housing and is provided with bores for holding the connecting lines.
  • the decoupling ring has a central opening, on the edge of which grooves are arranged for holding the connecting lines. It is advantageous if a part of the interior of the housing, including the central opening, which is not occupied by the decoupling ring is filled with a damping material.
  • the connecting lines are flexible.
  • the connecting lines are formed for example by strands, a simple assembly of the ultrasonic transducer according to the invention is nevertheless possible on a printed circuit board, the connecting lines fitting through the holder into the bores arranged in the respective grid dimension.
  • the connecting lines held in the decoupling ring are rigid and are connected to the piezo element via flexible line pieces. Simple assembly is also ensured here.
  • the decoupling ring has an opening in addition to the bores for holding the connecting lines, and that the opening and a part of the interior of the housing which is not occupied by the decoupling ring are filled with a damping material. In this configuration, the rigid
  • Decoupling ring to keep the position of the connecting lines or their distance exactly, can be provided according to a further development that the connecting lines are held on the surface of the decoupling ring by a preferably annular web.
  • Fig. 2 shows a second embodiment in four views
  • Fig. 3 shows a third embodiment in three views.
  • the figures show the exemplary embodiments in each case in a view from the radiation direction or reception direction (a) and a plan view from the connection side (b) and in each case as a longitudinal section (c) or (d).
  • the illustrated exemplary embodiments each contain a sensor transducer pot 1, for example made of aluminum, to the bottom of which the piezo element 2 is fastened, for example glued, on the inside.
  • a decoupling ring 4, 6, 9 made of elastic material, preferably made of silicone, is provided which covers 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 simply pressing it into a corresponding opening in the body part, not shown.
  • connecting strands 3 are contacted with the piezo element 2.
  • 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 hole running through the entire decoupling ring 6 is provided.
  • two rigid connecting lines 4 are provided, each of which is connected to the piezo element 2 via a flexible line 7.
  • the rigid connecting lines 8 are in turn held in the decoupling ring 9, with an additional web 10 made of low-elasticity additionally fixing the connecting lines 8. 3, the cavities are filled with a damping material 11.

Landscapes

  • 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)

Abstract

The invention relates to an ultrasonic transducer having a cup-like housing (1) with an annular wall and a bottom surface (2) that serves as membrane. A piezoelectric element, fitted on the inside of the bottom surface, is connected to the bonding conductors (3). The side opposite the bottom surface (2) is enclosed by a decoupling ring (4) which is configured as a retainer for the bonding conductors (3).

Description

Ultraschallwandler Ultrasonic transducer
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 cup-like housing with an annular wall and a bottom surface as a membrane, a piezo element being attached to the inside of the bottom surface and being connected to connecting lines.
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. Such ultrasonic transducers are used, for example, as sensors for distance measuring devices.
Aufgabe der vorliegenden Erfindung ist es, einen Ultraschallwandler anzugeben mit stabiler, montagegerechter Kontaktierung .The object of the present invention is to provide an ultrasonic transducer with stable, assembly-compatible contacting.
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. 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.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 in that the decoupling ring is designed as a holder for the connecting lines. A first advantageous embodiment of the ultrasonic transducer according to the invention consists in that the decoupling ring essentially fills the housing and is provided with bores for holding the connecting lines.
Bei einer zweiten Ausführungsform ist vorgesehen, daß der Entkopplungsring eine zentrale Öffnung aufweist, an deren Rand Nuten zur Halterung der Anschlußleitungen 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, on the edge of which grooves are arranged for holding the connecting lines. It is advantageous if a part of the interior of the housing, including the central opening, which is not occupied by the decoupling ring is filled with a damping material.
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 ultrasonic transducer according to the invention is that the connecting lines are flexible. By holding the flexible connecting lines, which are formed for example by strands, a simple assembly of the ultrasonic transducer according to the invention is nevertheless possible on a printed circuit board, the connecting lines fitting through the holder into the bores arranged in the respective grid dimension.
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 Dämpfungsmaterial ausgefüllt sind. Bei dieser Ausgestaltung können die starrenIn another advantageous embodiment of the ultrasonic transducer according to the invention it is provided that the connecting lines held in the decoupling ring are rigid and are connected to the piezo element via flexible line pieces. Simple assembly is also ensured here. In this embodiment, it is preferably provided that the decoupling ring has an opening in addition to the bores for holding the connecting lines, and that the opening and a part of the interior of the housing which is not occupied by the decoupling ring are filled with a damping material. In this configuration, the rigid
Anschlußleitungenen gerade herausgeführt oder außerhalb des Gehäuses um 90° abgebogen sein.Connection lines straight out or bent 90 ° outside the housing.
Um trotz der elastischen Eigenschaften desDespite the elastic properties of the
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.Decoupling ring to keep the position of the connecting lines or their distance exactly, can be provided according to a further development that the connecting lines are held on the surface of the decoupling ring by a preferably annular web.
Ausführungsbeispiele der Erfindung sind in der Zeichnung anhand mehrerer Figuren dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigt: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 ein erstes Ausführungsbeispiel in vier Ansichten,1 shows a first embodiment in four views,
Fig. 2 ein zweites Ausführungsbeispiel in vier Ansichten undFig. 2 shows a second embodiment in four views
Fig. 3 ein drittes Ausführungsbeispiel in drei Ansichten.Fig. 3 shows 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 provided with the same reference symbols in the figures. The figures show the exemplary embodiments in each case in a view from the radiation direction or reception direction (a) and a plan view from the connection side (b) and in each case 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 einem Teil einer 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 exemplary embodiments each contain a sensor transducer pot 1, for example made of aluminum, to the bottom of which the piezo element 2 is fastened, for example glued, on the inside. For mounting the ultrasonic transducer in a fixed part, for example in a part of a motor vehicle body, a decoupling ring 4, 6, 9 made of elastic material, preferably made of silicone, is provided which covers 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 simply pressing it into a corresponding opening in the body part, not shown.
Bei dem Ausfuhrungsbeispiel 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 are contacted with the piezo element 2. 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 er den gesamten Innenraum des Sensortopfes 1 einnimmt. Für die Anschlußlitzen 3 ist jeweils eine den gesamten Entkopplungsring 6 durchlaufende Bohrung vorgesehen.In the embodiment of FIG. 2, the decoupling ring 6 is designed such that it occupies the entire interior of the sensor pot 1. For the connecting strands 3, a hole running through the entire decoupling ring 6 is provided.
Bei dem Ausführungsbeispiel nach Fig. 3 sind zwei starre Anschlußleitungen 4 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, two rigid connecting lines 4 are provided, each of which is connected to the piezo element 2 via a flexible line 7. The rigid connecting lines 8 are in turn held in the decoupling ring 9, with an additional web 10 made of low-elasticity additionally fixing the connecting lines 8. 3, the cavities are filled with a damping material 11.

Claims

Ansprüche Expectations
1. 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, dadurch gekennzeichnet, daß der von der Bodenfläche abgewandte Rand von einem Entkopplungsring (4,1. Ultrasonic transducer with a pot-like housing with an annular wall and a bottom surface as a membrane, a piezo element being attached to the inside of the bottom surface and being connected to connecting leads, characterized in that the edge facing away from the bottom surface is separated by a decoupling ring (4,
6, 9) umgeben ist und daß der Entkopplungsring (4, 6, 9) als Halter für die Anschlußleitungen (3, 8) ausgebildet ist.6, 9) and that the decoupling ring (4, 6, 9) is designed as a holder for the connecting lines (3, 8).
2. Ultraschallwandler nach Anspruch 1, dadurch gekennzeichnet, daß der Entkopplungsring (6) das Gehäuse (1) im wesentlichen ausfüllt und mit Bohrungen zur Halterung der Anschlußleitungen (3) versehen ist.2. Ultrasonic transducer according to claim 1, characterized in that the decoupling ring (6) substantially fills the housing (1) and is provided with bores for holding the connecting lines (3).
3. Ultraschallwandler nach Anspruch 1, dadurch gekennzeichnet, daß der Entkopplungsring (4) eine zentrale Öffnung aufweist, an deren Rand Nuten zur Halterung der Anschlußleitungen (3) angeordnet sind.3. Ultrasonic transducer according to claim 1, characterized in that the decoupling ring (4) has a central opening, at the edge of which grooves for holding the connecting lines (3) are arranged.
4. Ultraschallwandler nach Anspruch 3, dadurch gekennzeichnet, daß ein nicht von dem Entkopplungsring (4) eingenommener Teil des Innenraums des Gehäuses (1) einschließlich der zentralen Öffnung mit einem4. Ultrasonic transducer according to claim 3, characterized in that a part of the interior of the housing (1) including the central opening with a not occupied by the decoupling ring (4)
Dämpf ngsmaterial (5) ausgefüllt ist. Damping material (5) is filled.
5. Ultraschallwandler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Anschlußleitungen (3) flexibel ausgebildet sind.5. Ultrasonic transducer according to one of the preceding claims, characterized in that the connecting lines (3) are flexible.
6. Ultraschallwandler nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die in dem Entkopplungsring (9) gehaltenen Anschlußleitungen (8) starr ausgebildet und über flexible Leitungsstücke (7) mit dem Piezoelement (2) verbunden sind.6. Ultrasonic transducer according to one of claims 1 or 2, characterized in that the connecting lines (8) held in the decoupling ring (9) are rigid and are connected to the piezo element (2) via flexible line pieces (7).
7. Ultraschallwandler nach Anspruch 6, dadurch gekennzeichnet, daß der Entkopplungsring (9) außer den Bohrungen zur Halterung der Anschlußleitungen (8) eine Öffnung aufweist und daß die Öffnung und ein nicht von dem Entkopplungsring (9) eingenommener Teil des Innenraums des Gehäuses (1) mit einem Dämpfungsmaterial (11) ausgefüllt sind.7. Ultrasonic transducer according to claim 6, characterized in that the decoupling ring (9) in addition to the bores for holding the connecting lines (8) has an opening and that the opening and a part of the interior of the housing (1) not occupied by the decoupling ring (9) ) are filled with a damping material (11).
8. Ultraschallwandler nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß die starren Anschlußleitungen (8) außerhalb des Gehäuses (1) um 90° abgebogen sind.8. Ultrasonic transducer according to one of claims 6 or 7, characterized in that the rigid connecting lines (8) outside the housing (1) are bent by 90 °.
9. Ultraschallwandler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Anschlußleitungen (8) an der Oberfläche des Entkopplungsringes (9) von einem, vorzugsweise ringförmig ausgebildeten Steg (10) gehalten werden. 9. Ultrasonic transducer according to one of the preceding claims, characterized in that the connecting lines (8) on the surface of the decoupling ring (9) are held by a preferably annular 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
DE19744229A DE19744229A1 (en) 1997-10-07 1997-10-07 Ultrasonic transducer
DE19744229 1997-10-07
PCT/DE1998/002938 WO1999018563A2 (en) 1997-10-07 1998-10-05 Ultrasonic transducer

Publications (2)

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

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Application Number Title Priority Date Filing Date
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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Also Published As

Publication number Publication date
DE19744229A1 (en) 1999-04-29
WO1999018563A3 (en) 1999-06-10
EP1064645B1 (en) 2003-09-24
WO1999018563A2 (en) 1999-04-15
DE59809750D1 (en) 2003-10-30
US6374676B1 (en) 2002-04-23

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