EP0940801B1 - Ultrasonic transducer with moulded centering element - Google Patents
Ultrasonic transducer with moulded centering element Download PDFInfo
- Publication number
- EP0940801B1 EP0940801B1 EP99103792A EP99103792A EP0940801B1 EP 0940801 B1 EP0940801 B1 EP 0940801B1 EP 99103792 A EP99103792 A EP 99103792A EP 99103792 A EP99103792 A EP 99103792A EP 0940801 B1 EP0940801 B1 EP 0940801B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ultrasonic transducer
- foam
- foam molding
- ultrasound transducer
- transducer device
- 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
Links
- 239000006260 foam Substances 0.000 claims description 13
- 238000010097 foam moulding Methods 0.000 claims description 12
- 238000002604 ultrasonography Methods 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 2
- 210000003850 cellular structure Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013017 mechanical damping Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
- B06B1/0662—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element with an electrode on the sensitive surface
- B06B1/067—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element with an electrode on the sensitive surface which is used as, or combined with, an impedance matching layer
Definitions
- the invention relates to an ultrasonic transducer device with a piezoceramic disc and a matching layer disc having ultrasonic transducer, the partial embedded in a housing using a polymer foam is.
- a generic ultrasonic transducer device is from the DE 33 01 848 C2 and DE 37 34 070 C2 are already known. Here are driven or to embed the ultrasonic transducer syntactic foams used. Embedding the ultrasonic transducers has three main functions. It should have a precise and reliable mechanical Bracket of the ultrasonic transducer, a mechanical one Damping effect as well as a visually appealing and opposite Insensitive converter visible surface reached become. The mechanical damping effect takes place in the way that the transducer vibration to achieve high acoustic Sensitivity moderately dampened and reproducible becomes.
- the invention has for its object the above Improve ultrasonic transducer device in such a way that the ultrasonic transducer is centered in a simple manner and at the same time a visually appealing, void-free viewing area is guaranteed.
- the object is achieved in that the adapter layer disc centered on its peripheral surface by a foam molding is.
- Foam molded parts are dimensionally accurate and inexpensive, for example by punching out of foam sheets to let.
- the use of such prefabricated and thus pre-testable centering moldings on the converter face enables series production with very simple and inexpensive devices while minimizing of the committee due to optical defects on the visible surface.
- Modern foams e.g. various cellular rubber materials, Are polyethylene or polyurethane foams mechanically robust and resistant to climatic and chemical influences.
- An advantageous development of the invention consists in that the foam molding is designed as a ring on which the circumferential surface of the adapter layer disc rests. This is a very simple and stable in terms of shape Execution of the foam molding.
- the foam molding is made of a closed cell foam Structure is made. Otherwise it is not to be excluded that when potting the ultrasonic transducer small amounts of pourable foam mass in the cell structure penetrate and thereby harden what vibration damping very adversely affected.
- the ultrasonic transducer 1 shows an ultrasonic transducer device with a Ultrasonic transducer, which is essentially a matching layer disc 1 and a piezoceramic disk 2.
- the ultrasonic transducer 1, 2 here is formed by a centering ring 4 Centered foam molding that is flush with the Transducer visible surface and a cylindrical housing 3 completes.
- the ultrasound transducer is in the interior of the housing 3 1,2 embedded in a foam 5, so that a positive and non-positive mechanical mounting of the ultrasonic transducer 1.2 in the housing 3 results.
- the foam molding 4 guarantees a flawless, void-free Visible surface. Because of the sealing effect of the foam molding 4 can be potted with the foam 5 practically without any device effort can be carried out.
- the further exemplary embodiment according to FIG. 2 shows a minor one Modification of the exemplary embodiment according to FIG. 1.
- This consists in the fact that a further foam molded part 6 as an elastic spacer and sealing ring between the Front surface of the ultrasonic transducer 1,2 and here on the Front 3 inwardly projecting housing 3 is used.
- the foam molding 6 is largely covered by the protrusion of the housing 3, whereby a protective function against mechanical influences is.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measuring Volume Flow (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
Die Erfindung bezieht sich auf eine Ultraschallwandlereinrichtung mit einem eine Piezokeramikscheibe und eine Anpaßschichtscheibe aufweisenden Ultraschallwandler, der teilweise in einem Gehäuse mittels eines Polymer-Schaumstoffs eingebettet ist.The invention relates to an ultrasonic transducer device with a piezoceramic disc and a matching layer disc having ultrasonic transducer, the partial embedded in a housing using a polymer foam is.
Eine gattungsgemäße Ultraschallwandlereinrichtung ist aus der DE 33 01 848 C2 und DE 37 34 070 C2 bereits bekannt. Hier werden zur Einbettung des Ultraschallwandlers getriebene oder syntaktische Schäume verwendet. Die Einbettung der Ultraschallwandler hat im wesentlichen drei Funktionen zu erfüllen. Es sollen eine positionsgenaue und zuverlässige mechanische Halterung des Ultraschallwandlers, eine mechanische Dämpfungswirkung sowie eine optisch ansprechende und gegenüber Umwelteinflüssen unempfindliche Wandlersichtfläche erreicht werden. Die mechanische Dämpfungswirkung erfolgt in der Weise, daß die Wandlerschwingung zur Erzielung hoher akustischer Empfindlichkeit mäßig und reproduzierbar gedämpft wird.A generic ultrasonic transducer device is from the DE 33 01 848 C2 and DE 37 34 070 C2 are already known. Here are driven or to embed the ultrasonic transducer syntactic foams used. Embedding the ultrasonic transducers has three main functions. It should have a precise and reliable mechanical Bracket of the ultrasonic transducer, a mechanical one Damping effect as well as a visually appealing and opposite Insensitive converter visible surface reached become. The mechanical damping effect takes place in the way that the transducer vibration to achieve high acoustic Sensitivity moderately dampened and reproducible becomes.
Bei der Fertigung solcher Ultraschallwandlereinrichtungen ist auf exaktes Positionieren und Zentrieren der Ultraschallwandler zu achten, was üblicherweise mit einem hohem Aufwand unter Anwendung mit speziellen Vorrichtungen verbunden ist. An der Sichtfläche der Ultraschallwandlereinrichtungen treten aufgrund des Schäumens häufig Lunker und Luftblasen auf, die aufwendig nachgebessert oder ausgemustert werden müssen.In the manufacture of such ultrasonic transducer devices for exact positioning and centering of the ultrasonic transducers to pay attention to what is usually expensive using special devices. Step on the visible surface of the ultrasonic transducer devices due to the foaming often blowholes and air bubbles on the have to be laboriously touched up or retired.
Daher liegt der Erfindung die Aufgabe zugrunde, die obengenannte Ultraschallwandlereinrichtung derart zu verbessern, daß der Ultraschallwandler auf einfache Weise zentriert ist und zugleich eine optisch ansprechende, lunkerfreie Sichtfläche gewährleistet ist. Therefore, the invention has for its object the above Improve ultrasonic transducer device in such a way that the ultrasonic transducer is centered in a simple manner and at the same time a visually appealing, void-free viewing area is guaranteed.
Die Aufgabe wird dadurch erreicht, daß die Anpaßschichtscheibe an ihrer Umfangsfläche durch ein Schaumstoff-Formteil zentriert ist. Es besteht hierbei der Vorteil, daß derartige Schaumstoff-Formteile sich maßgenau und kostengünstig, beispielsweise durch Ausstanzen aus Schaumstoffplatten, herstellen lassen. Der Einsatz derartiger vorgefertigter und damit vorprüfbarer Zentrier-Formteile an der Wandlersichtfläche ermöglicht eine Serienfertigung mit sehr einfachen und kostengünstigen Vorrichtungen bei gleichzeitiger Minimierung des Ausschusses aufgrund von optischen Fehlern an der Sichtfläche. Moderne Schaumstoffe, wie z.B. diverse Zellkautschuk-Werkstoffe, Polyethylen- oder Polyurethan-Schaumstoffe sind mechanisch robust und beständig gegenüber klimatischen und chemischen Einflüssen.The object is achieved in that the adapter layer disc centered on its peripheral surface by a foam molding is. There is the advantage that such Foam molded parts are dimensionally accurate and inexpensive, for example by punching out of foam sheets to let. The use of such prefabricated and thus pre-testable centering moldings on the converter face enables series production with very simple and inexpensive devices while minimizing of the committee due to optical defects on the visible surface. Modern foams, e.g. various cellular rubber materials, Are polyethylene or polyurethane foams mechanically robust and resistant to climatic and chemical influences.
Eine vorteilhafte Weiterbildung der Erfindung besteht darin, daß das Schaumstoff-Formteil als Ring ausgebildet ist, an dem die Umfangsfläche der Anpaßschichtscheibe anliegt. Dies ist eine bezüglich der Formgebung sehr einfache und dabei stabile Ausführung des Schaumstoff-Formteils.An advantageous development of the invention consists in that the foam molding is designed as a ring on which the circumferential surface of the adapter layer disc rests. This is a very simple and stable in terms of shape Execution of the foam molding.
Weiterhin hat es sich als vorteilhaft erwiesen, wenn das Schaumstoff-Formteil bündig mit der Abstrahlfläche der Anpaßschichtscheibe abschließt.Furthermore, it has proven to be advantageous if the Foam molded part flush with the radiation surface of the matching layer pane concludes.
Um schädliche Einflüsse durch Feuchtigkeit oder ähnlichem von außen her zu vermeiden, hat es sich als vorteilhaft erwiesen, wenn das Schaumstoff-Formteil aus einem Schaumstoff mit geschlossenzelliger Struktur hergestellt ist. Andernfalls ist nicht auszuschließen, daß beim Verguß des Ultraschallwandlers kleine Mengen an gießbarer Schaummasse in die Zellstruktur eindringen und diese damit verhärten, was die Schwingungsdämpfung sehr nachteilig beeinflußt.To harmful effects from moisture or the like of avoiding the outside, it has proven to be advantageous if the foam molding is made of a closed cell foam Structure is made. Otherwise it is not to be excluded that when potting the ultrasonic transducer small amounts of pourable foam mass in the cell structure penetrate and thereby harden what vibration damping very adversely affected.
Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand einer Zeichnung näher erläutert. Es zeigen:
- FIG 1
- eine Ultraschallwandlereinrichtung mit bündiger Sichtfläche und
- FIG 2
- eine Ultraschallwandlereinrichtung mit einem elastischen Abstandshalter.
- FIG. 1
- an ultrasonic transducer device with a flush visible surface and
- FIG 2
- an ultrasonic transducer device with an elastic spacer.
FIG 1 zeigt eine Ultraschallwandlereinrichtung mit einem
Ultraschallwandler, der im wesentlichen eine Anpaßschichtscheibe
1 und eine Piezokeramikscheibe 2 aufweist. Der Ultraschallwandler
1,2 ist hier durch ein als Zentrierring 4 ausgebildetes
Schaumstoff-Formteil zentriert, das bündig mit der
Wandlersichtfläche und einem zylindrischen Gehäuse 3 abschließt.
Im Innenraum des Gehäuses 3 ist der Ultraschallwandler
1,2 in einem Schaumstoff 5 eingebettet, so daß sich
eine form- und kraftschlüssige mechanische Halterung des Ultraschallwandlers
1,2 im Gehäuse 3 ergibt. Das Schaumstoff-Formteil
4 gewährleistet eine einwandfreie, lunkerfreie
Sichtfläche. Wegen der Dichtungswirkung des Schaumstoff-Formteils
4 kann der Verguß mit dem Schaumstoff 5 praktisch ohne
jeglichen Vorrichtungsaufwand durchgeführt werden.1 shows an ultrasonic transducer device with a
Ultrasonic transducer, which is essentially a matching
Das weitere Ausführungsbeispiel gemäß FIG 2 zeigt eine geringfügige
Abwandlung des Ausführungsbeispiels nach FIG 1.
Diese besteht darin, daß ein weiteres Schaumstoff-Formteil 6
als elastischer Abstandshalter und Dichtungsring zwischen der
Frontfläche des Ultraschallwandlers 1,2 und dem hier auf der
Frontseite nach innen überstehenden Gehäuse 3 eingesetzt ist.
Bei dieser Ausführung ist das Schaumstoff-Formteil 6 weitgehend
durch den Überstand des Gehäuses 3 abgedeckt, wodurch
eine Schutzfunktion gegen mechanische Einwirkungen gegeben
ist.The further exemplary embodiment according to FIG. 2 shows a minor one
Modification of the exemplary embodiment according to FIG. 1.
This consists in the fact that a further foam molded part 6
as an elastic spacer and sealing ring between the
Front surface of the
Claims (4)
- Ultrasound transducer device with a piezoceramic disk (2) and an ultrasound transducer with an adaptor disk (1), that is partially embedded in a housing (3) by means of a polymer foam (5), characterized in that the adapter disk (1) is centered at its circumferential surface by a foam molding (4) .
- Ultrasound transducer device in accordance with claim 1, characterized in that the foam molding is formed as a ring (4) against which the circumferential surface of the adaptor disk (1) lies.
- Ultrasound transducer device in accordance with claim 1, characterized in that the foam molding (4) is flush with the surface of the adaptor disk (1) that radiates ultrasound waves.
- Ultrasound transducer device in accordance with one of the preceding claims, characterized in that the foam molding (4) is manufactured from a foam with a closed cellular structure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19809206A DE19809206C2 (en) | 1998-03-04 | 1998-03-04 | Ultrasonic transducer device with centering molding |
| DE19809206 | 1998-03-04 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0940801A2 EP0940801A2 (en) | 1999-09-08 |
| EP0940801A3 EP0940801A3 (en) | 2001-06-20 |
| EP0940801B1 true EP0940801B1 (en) | 2004-01-21 |
Family
ID=7859664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99103792A Expired - Lifetime EP0940801B1 (en) | 1998-03-04 | 1999-02-26 | Ultrasonic transducer with moulded centering element |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0940801B1 (en) |
| DE (2) | DE19809206C2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19957125A1 (en) * | 1999-11-26 | 2001-06-21 | Siemens Ag | Ultrasound transducer |
| DE102018005540B4 (en) | 2018-07-13 | 2022-06-09 | Pepperl+Fuchs Ag | 1D ultrasonic transducer unit |
| DE102018006139B3 (en) * | 2018-08-03 | 2019-06-19 | Pepperl+Fuchs Gmbh | 1D ultrasonic transducer unit for area monitoring |
| DE102018006127B4 (en) * | 2018-08-03 | 2021-07-08 | Pepperl+Fuchs Ag | 1D ultrasonic transducer unit for material detection |
| DE102018006130B3 (en) | 2018-08-03 | 2019-08-08 | Pepperl + Fuchs Gmbh | 1D ultrasonic transducer unit for hazard detection for a vehicle |
| DE102022200918B3 (en) | 2022-01-27 | 2023-04-27 | Vitesco Technologies Germany Gmbh | Method of manufacturing an ultrasonic sensor and ultrasonic sensor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3234896A1 (en) * | 1982-09-21 | 1984-03-22 | Siemens AG, 1000 Berlin und 8000 München | Ultrasonic transducer |
| DE3301848C2 (en) * | 1983-01-20 | 1984-11-08 | Siemens AG, 1000 Berlin und 8000 München | Ultrasonic transducer |
| DE3734070A1 (en) * | 1987-10-08 | 1989-04-20 | Siemens Ag | Syntactic damping foam |
| DE3823477A1 (en) * | 1988-07-11 | 1990-01-18 | Siemens Ag | Process for producing ultrasonic transducers |
| EP0498015B1 (en) * | 1991-02-07 | 1993-10-06 | Siemens Aktiengesellschaft | Process for manufacturing ultrasonic transducers |
| DE4323134C1 (en) * | 1993-07-10 | 1994-06-16 | Pil Sensoren Gmbh | Ultrasonic oscillator - has oversize matching body resting on support ring for acoustic dampening |
-
1998
- 1998-03-04 DE DE19809206A patent/DE19809206C2/en not_active Expired - Fee Related
-
1999
- 1999-02-26 EP EP99103792A patent/EP0940801B1/en not_active Expired - Lifetime
- 1999-02-26 DE DE59908332T patent/DE59908332D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE19809206C2 (en) | 2001-02-15 |
| EP0940801A3 (en) | 2001-06-20 |
| DE19809206A1 (en) | 1999-09-23 |
| EP0940801A2 (en) | 1999-09-08 |
| DE59908332D1 (en) | 2004-02-26 |
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