DE3441684A1 - Electro-acoustic transducer - Google Patents

Electro-acoustic transducer

Info

Publication number
DE3441684A1
DE3441684A1 DE19843441684 DE3441684A DE3441684A1 DE 3441684 A1 DE3441684 A1 DE 3441684A1 DE 19843441684 DE19843441684 DE 19843441684 DE 3441684 A DE3441684 A DE 3441684A DE 3441684 A1 DE3441684 A1 DE 3441684A1
Authority
DE
Germany
Prior art keywords
membrane
ceramic body
piezoelectric ceramic
converter according
major
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.)
Ceased
Application number
DE19843441684
Other languages
German (de)
Inventor
Otto 7950 Biberach Bader
Gerhard 7123 Sachsenheim Wagemann
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.)
SWF Auto Electric GmbH
Original Assignee
SWF Auto Electric 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 SWF Auto Electric GmbH filed Critical SWF Auto Electric GmbH
Priority to DE19843441684 priority Critical patent/DE3441684A1/en
Publication of DE3441684A1 publication Critical patent/DE3441684A1/en
Ceased legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/122Devices 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
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K13/00Cones, diaphragms, or the like, for emitting or receiving sound in general

Abstract

An ultrasonic transducer is described which has an elliptical diaphragm and an elliptical piezoelectric ceramic body. Through this shape, which differs from conventional designs, a directional characteristic can be achieved in such a way that a small beamwidth is measured in one plane whereas, in a plane perpendicular to it, a much larger beamwidth of the radiated sound is measured.

Description

PAL/A 12 841 Kubier / sb 15.10.1984PAL / A 12 841 Kubier / sb October 15, 1984

Titel: Elektroakustischer WandlerTitle: Electroacoustic converter

Die Erfindung bezieht sich auf einen elektroakustischen Wandler gemäß den Merkmalen des Oberbegriffes des Anspruchs 1.The invention relates to an electroacoustic transducer according to the features of the preamble of claim 1.

Zur Ermittlung und Anzeige von Abständen zwischen Kraftfahrzeugen und Hindernissen sind Ultraschall-Wandler wünschenswert, die in einer vertikalen Ebene eine Schallabstrahlung trat besonders geringem öffnungswinkel, in einer horizontalen Ebene dagegen eine Schallabstrahlung mit einem verhältnismäßig großen Öffnungswinkel erzeugen. Dadurch sollen einerseits störende Bodenreflektionen vermieden werden, andererseits sollen aber auch seitlich eines Kraftfahrzeugs vorhandene Hindernisse einwandfrei erfasst werden.Ultrasonic transducers are desirable for determining and displaying distances between motor vehicles and obstacles. The sound radiation occurred in a vertical plane with a particularly small opening angle, in a horizontal plane on the other hand, a sound radiation with a relatively large Generate opening angle. This should on the one hand avoid disturbing reflections from the ground, but on the other hand obstacles present on the side of a motor vehicle are also flawless are recorded.

In der DE-OS 31 37 745 ist bereits ein Ultraschall-Wandler beschrieben, der diese Bedingungen erfüllen soll. Dieser bekannte Wandler hat eine kreisförmige Membran, dessen Fläche jedoch nicht voll zur Schallabstrahlung ausgenutzt wird, weil zwei horizontal gegenüberliegende, kreisabschnittsförmige Dämpfungssegmente aus Weichgummi die innere Membranfläche bedecken. Bei dieser Ausführung werden also zusätzliche Teile benötigt und außerdem ist die Baugröße des Wandlers in einer Ebene senkrecht zur Schallabstrahlrichtung wesentlich größer als die wirksame Schallabstrahlfläche der Membran, was in manchen Kraftfahrzeugen Einbauschwierigkeiten mit sich bringt.In DE-OS 31 37 745 an ultrasonic transducer is already described, who should meet these conditions. This known transducer has a circular membrane, but its area is not fully used for sound radiation, because two horizontally opposite, circular segment-shaped damping segments made of soft rubber cover the inner membrane surface. at This version therefore requires additional parts and, moreover, the size of the transducer is perpendicular in a plane to the direction of sound radiation much larger than the effective sound radiation area of the membrane, which is in some motor vehicles Brings installation difficulties.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen elektroakustischen Wandler zu schaffen, der die eingangs erwähnten Forderungen erfüllt, kostengünstig hergestellt werden kann und eine möglichst kleine Raumform aufweist.The present invention is based on the object of creating an electroacoustic transducer which has the aforementioned Requirements met, can be manufactured inexpensively and has the smallest possible spatial shape.

Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the invention with the characterizing Features of claim 1 solved.

Der Erfindung liegt dabei der Gedanke zugrunde, daß allein durch die Formgebung der Membran die erwünschte Richtcharakteristik des abgestrahlten Schalles erreicht wird. Messungen haben ergeben, daß bei einem solchen Wandler der öffnungswinkel des abgestrahlten Schalles in einer Ebene parallel zur großen Hauptachse sehr viel geringer ist als in einer dazu senkrechten Ebene parallel zur kleinen Hauptachse.The invention is based on the idea that the desired directional characteristic is achieved solely through the shape of the membrane of the emitted sound is achieved. Measurements have shown that with such a transducer the opening angle of the radiated sound is much smaller in a plane parallel to the major main axis than in one of it vertical plane parallel to the minor major axis.

Der bei diesem Wandler verwendete piezoelektrische Keramikkörper kann durchaus in der üblichen kreisrunden Form ausgebildet sein, doch wurden besonders günstige Meßergebnisse bei Verwendung eines piezoelektrischen Keramikkörpers mit einem ebenfalls elliptischen Umriss erzielt, wobei dieser Piezokörper nahezu die gesamte Fläche der Membran bedeckte.The piezoelectric ceramic body used in this transducer can certainly be designed in the usual circular shape be, but were particularly favorable measurement results when using a piezoelectric ceramic body with a also achieved an elliptical contour, this piezo body covering almost the entire surface of the membrane.

Durch umfangreiche Versuchsreihen wurden optimale Abmessungen für die Membran ermittelt, auf die in der nachfolgenden Beschreibung des in der Zeichnung dargestellten Ausführungsbeispiels zu der Erfindung hingewiesen wird.Through extensive series of tests, optimal dimensions for the membrane were determined, based on the following description of the embodiment shown in the drawing of the invention is pointed out.

Es zeigen: Figur 1 einen Schnitt durch einen elektroakustischen Wandler,They show: FIG. 1 a section through an electroacoustic transducer,

Figur 2 eine Ansicht in Pfeilrichtung α auf den in Figur 1 dargestellten Wandler undFIG. 2 shows a view in the direction of the arrow α of the converter shown in FIG. 1 and FIG

Figur 3 ein Richtdiagramm.Figure 3 is a directional diagram.

Der in Figur 1 dargestellte Wandler hat ein Gehäuse 10 , das vorzugsweise aus Gummi oder Plastik geformt ist.The converter shown in Figure 1 has a housing 10 which is preferably molded from rubber or plastic.

Dieses Gehäuse ist in der nur angedeuteten Stoßstange 11 eines Kraftfahrzeuges befestigt. In Abstrahlrichtung ist dieses Gehäuse 10 durch eine Aluminiumkappe 12 abgeschlossen, deren Grundfläche 13 als Membran ausgebildet ist. Auf dieser Membran 13 sitzt ein piezoelektrischer Keramikkörper 14, der auf der der Membran gegenüberliegenden Seite durch eine Schaumstoff schicht 15 abgedeckt ist. Dahinter befindet sich eine
Schicht 16 aus Silikonkautschuk, die mit einem ringförmigen
Ansatz unmittelbar bis zur Membran 13 reicht. Außerdem erkennt man in Figur 1 noch eine Leiterplatte 17, von der die Anschlußdrähte für den piezoelektrischen Keramikkörper ausgehen. Diese Leiterplatte 17 beinhaltet elektrische Elemente einer Signalauswerteschaltung. Eine Steckerplatte 18 schließt das Gehäuse 10 nach hinten ab.
This housing is fastened in the only indicated bumper 11 of a motor vehicle. In the direction of emission, this housing 10 is closed by an aluminum cap 12, the base area 13 of which is designed as a membrane. On this membrane 13 sits a piezoelectric ceramic body 14 which is covered by a foam layer 15 on the side opposite the membrane. Behind it is one
Layer 16 of silicone rubber covered with an annular
Approach extends directly to the membrane 13. In addition, a printed circuit board 17 can be seen in FIG. 1, from which the connecting wires for the piezoelectric ceramic body extend. This circuit board 17 contains electrical elements of a signal evaluation circuit. A connector plate 18 closes the housing 10 from the rear.

Wesentlich für die vorliegende Erfindung ist nun, daß im Gegensatz zu den bisher bekannten Ausführungen der Umriss der Membran 13 in einer Ebene senkrecht zur Schallabstrahlrichtung annähernd elliptisch ausgebildet ist, wie das in Figur 2 ersichtlich ist. Dabei ist die große Hauptachse mit der Länge a in vertikaler Richtung ausgerichtet, während sich die kleine Halbachse mit der Länge b in horizontaler Richtung und damit parallel zur Fahrbahn erstreckt, wichtig für eine optimale Richtcharakteristik ist das Verhältnis zwischen großer Hauptachse und kleiner Hauptachse, das in der Größenordnung zwischen 2 und 3 liegen sollte. Bei einer konkreten Ausführung betrug dieses Verhältnis 2,45, wobei die Membran eine große Hauptachse von a = 27 mm und eine kleine Hauptachse von b = 11 mm aufwies. Diese Werte wurden auf die Schwingfreguenz des piezoelektrischen Keramikkörpers 14
abgestimmt, der auf eine Schwingfrequenz von 41 kHz ausgelegt
war. Die Dicke d der Membran betrug 1,05mm,so daß ein ausreichend hoher Schalldruck gemessen werden konnte.
It is now essential for the present invention that, in contrast to the previously known designs, the outline of the membrane 13 is approximately elliptical in a plane perpendicular to the direction of sound radiation, as can be seen in FIG. The major main axis with the length a is aligned in the vertical direction, while the small semiaxis with the length b extends in the horizontal direction and thus parallel to the roadway the order of magnitude should be between 2 and 3. In a specific embodiment, this ratio was 2.45, the membrane having a major major axis of a = 27 mm and a minor major axis of b = 11 mm. These values were applied to the vibration frequency of the piezoelectric ceramic body 14
tuned, which is designed for an oscillation frequency of 41 kHz
was. The thickness d of the membrane was 1.05 mm, so that a sufficiently high sound pressure could be measured.

A 12 841 ■;- - 6 -A 12 841 ■; - - 6 -

Ansich könnte man durchaus einen kreisrunden Keramikkörper verwenden, doch verbessert sich das Nachschwingverhalten des Wandlers, wenn man gemäß einer vorteilhaften Weiterbildung der Erfindung einen piezoelektrischen Keramikkörper mit ebenfalls elliptischem Umriss verwendet, der - wie Figur 1 zeigt - nahezu die gesamte Fläche der Membran 13 bedeckt.In and of itself, a circular ceramic body could be used, but the post-oscillation behavior is improved of the transducer if, according to an advantageous development of the invention, a piezoelectric ceramic body Also used with an elliptical outline, which - as FIG. 1 shows - almost the entire surface of the membrane 13 covered.

Auch die zur Schwingungsdämpfung dienende SchaumstoffschichtAlso the foam layer used to dampen vibrations

15 hat einen elliptischen Umriss. Diese Schicht deckt den Keramikkörper 14 nicht vollständig ab, so daß der Keramikkörper im Randbereich zwischen der Membran 13 und der Schicht15 has an elliptical outline. This layer does not completely cover the ceramic body 14, so that the ceramic body in the edge area between the membrane 13 and the layer

16 aus Silikonkautschuk eingespannt ist.16 is clamped in silicone rubber.

Aus dem Diagramm der Richtcharakteristik in Figur 3 geht hervor, daß der öffnungswinkel des abgestrahlten Schalles in einer vertikalen Ebene (dicke Linie) wesentlich geringer ist als in der horizontalen Ebene (dünne Linie).The diagram of the directional characteristic in FIG. 3 shows that the opening angle of the emitted sound is in a vertical plane (thick line) is much smaller than in the horizontal plane (thin line).

- Leerseite -- blank page -

Claims (7)

SVF Auto-Elec'tric GmbH, 7120 Bietigheim-BissingenSVF Auto-Elec'tric GmbH, 7120 Bietigheim-Bissingen PAL/A 12.841 Küblex/Tü 26.10.1984PAL / A 12.841 Küblex / Tü October 26, 1984 Elektroakustischer WandlerElectroacoustic converter P at ent ans prii ehe:P at ent ans prii marriage: hy Elektroakustischer Wandler, insbesondere Ultraschall-Wandler für ein in ein Kraftfahrzeug eingebautes Entfernungsmeßgerät, mit einem auf einer Membran angeordneten piezoelektrischen Keramikkörper, dadurch gekennzeichnet, daß der Umriß der Membran (13) in einer Ebene senkrecht zur Schallabstrahlrichtung annähernd elliptisch ausgebildet ist. hy Electroacoustic transducer, in particular ultrasonic transducer for a distance measuring device built into a motor vehicle, with a piezoelectric ceramic body arranged on a membrane, characterized in that the outline of the membrane (13) is approximately elliptical in a plane perpendicular to the direction of sound emission. 2. Wandler nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis zwischen der großen Hauptachse (a) und der kleinen Hauptachse (b) der Ellipse zwischen zwei und drei, vorzugsweise bei 2,45 liegt.2. Converter according to claim 1, characterized in that the Ratio between the major major axis (a) and the minor major axis (b) of the ellipse between two and three, preferably is 2.45. 3· Wandler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Längen der Achsen der Ellipse auf die Schwingungsfrequenz des piezoelektrischen Keramikkörpers (i4) abgestimmt3 converter according to claim 1 or 2, characterized in that that the lengths of the axes of the ellipse are matched to the oscillation frequency of the piezoelectric ceramic body (i4) vonfrom sind und bei einer Schwingfrequenz Vetwa 40 kHz die große Hauptachse 27 mm und die kleine Hauptachse 11 mm lang ist.are and at an oscillation frequency V about 40 kHz the major main axis 27 mm and the small main axis is 11 mm long. ' ' 4. Wandler nach wenigstens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Membran (13) eine Wandstärke (d) zwischen 0,8 und 1,2, vorzugsweise von 1,05 mm aufweist.4. Converter according to at least one of claims 1 to 3, characterized in that the membrane (13) has a wall thickness (d) between 0.8 and 1.2, preferably 1.05 mm. 5. Wandler nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß auch der piezoelektrische Keramikkörper (i4) annähernd einen elliptischen Umriß aufweist, der nahezu die gesamte Fläche der Membran (13) bedeckt.5. Converter according to at least one of the preceding claims, characterized in that the piezoelectric ceramic body (i4) has an approximately elliptical outline that covers almost the entire surface of the membrane (13). 6. Wandler nach wenigstens einem der Ansprüche 1 bis 5» dadurch gekennzeichnet, daß auf der der Membran gegenüberliegenden Seite der piezoelektrische Keramikkörper (1h) von einer Schaumstoffschicht (15) mit ebenfalls annähernd elliptischem Umriß teilweise abgedeckt ist.6. Transducer according to at least one of claims 1 to 5 »characterized in that on the side opposite the membrane the piezoelectric ceramic body (1 h ) is partially covered by a foam layer (15) also having an approximately elliptical outline. 7. Wandler nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß er in einem Kraftfahrzeug derart eingebaut ist, daß die große Hauptachse der elliptischen Membran wenigstens annähernd in vertikaler Richtung zeigt, während die kleine Hauptachse in horizontaler Richtung und damit etwa parallel zur Fahrbahn ausgerichtet ist.7. Converter according to at least one of the preceding claims, characterized in that it is in a motor vehicle is installed in such a way that the major axis of the elliptical membrane points at least approximately in the vertical direction, while the small main axis is aligned in the horizontal direction and thus approximately parallel to the roadway.
DE19843441684 1984-11-15 1984-11-15 Electro-acoustic transducer Ceased DE3441684A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19843441684 DE3441684A1 (en) 1984-11-15 1984-11-15 Electro-acoustic transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843441684 DE3441684A1 (en) 1984-11-15 1984-11-15 Electro-acoustic transducer

Publications (1)

Publication Number Publication Date
DE3441684A1 true DE3441684A1 (en) 1986-05-15

Family

ID=6250325

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19843441684 Ceased DE3441684A1 (en) 1984-11-15 1984-11-15 Electro-acoustic transducer

Country Status (1)

Country Link
DE (1) DE3441684A1 (en)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3812182A1 (en) * 1988-04-13 1989-10-26 Swf Auto Electric Gmbh Transducer, particularly ultrasonic transducer for a distance measuring device installed in a motor vehicle
DE3939387A1 (en) * 1989-11-29 1991-06-06 Swf Auto Electric Gmbh Ultrasonic distance warning system esp. for motor vehicles - has aperture covering membrane carrying piezo-plate to eliminate group echos
EP0678853A2 (en) 1994-04-21 1995-10-25 ITT Automotive Europe GmbH Ultrasonic transducer with asymmetric radiation characteristic
DE19528474A1 (en) * 1995-08-03 1997-02-06 Teves Gmbh Alfred Ultrasonic transducer with holder to mounting on motor vehicle shock absorber - has spring for holding transducer at predetermined distance from inner surface of shock absorber
DE19601656A1 (en) * 1996-01-18 1997-07-24 Teves Gmbh Alfred Damped ultrasonic transducer
DE19614885C1 (en) * 1996-04-16 1997-09-04 Bosch Gmbh Robert Sensor for sending and / or receiving acoustic signals
DE19651033A1 (en) * 1996-12-09 1998-06-10 Sennheiser Electronic Electrodynamic converter
DE19714606A1 (en) * 1997-04-09 1998-10-15 Itt Mfg Enterprises Inc Ultra sound transmitter and receiver for motor vehicle distance warning system
WO1999001234A2 (en) * 1997-06-30 1999-01-14 Robert Bosch Gmbh Ultrasonic transducer
WO1999018563A2 (en) * 1997-10-07 1999-04-15 Robert Bosch Gmbh Ultrasonic transducer
WO1999030313A1 (en) * 1997-12-10 1999-06-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Ultrasonic transducer with a cup-shaped support
DE19839598A1 (en) * 1998-08-31 2000-03-09 Itt Mfg Enterprises Inc Mounting sleeve for ultrasonic transducer for inclined attachment to plate, e.g. for vehicle parking aid, has peripheral, essentially annular fitting whose outer surface height varies over its circumference
WO2001005305A1 (en) * 1999-07-21 2001-01-25 Boston Scientific Limited Focused ultrasound transducers and systems
WO2001029820A1 (en) * 1999-10-22 2001-04-26 Thomson Marconi Sonar S.A.S. Underwater broadband acoustic transducer
DE10000924A1 (en) * 2000-01-12 2001-07-19 Volkswagen Ag Ultrasonic sensor, especially for vehicle distance measurement device, has membrane with resonance body mechanically separate from housing with electronics, electrical connecting element
DE10009129A1 (en) * 2000-02-26 2001-08-30 Volkswagen Ag Ultrasonic sensor has pot-shaped vibration element whose floor acts as membrane with at least two disc-shaped piezoelectric transducers attached to membrane and adjacent to each other
DE10153638A1 (en) * 2001-07-02 2003-05-22 Shih Hsiung Li Ultrasonic sensor for distance measurement, has piezoelectric ceramic element which generates specific detecting area according to shape of tapered rectangular chamber
DE10159679A1 (en) * 2001-11-30 2003-06-12 Valeo Schalter & Sensoren Gmbh Ultrasonic sensor unit and manufacturing method
DE19912772C2 (en) * 1998-03-26 2003-07-10 Shih Hsiung Li Ultrasonic sensor for distance measurement
EP1315144A3 (en) * 2001-11-27 2010-03-17 Hydrometer GmbH Ultrasonic transducer and flowmeter
DE102009056268A1 (en) * 2009-12-01 2011-06-09 Techem Energy Services Gmbh Hazard detector and method for detecting objects in the vicinity of the danger detector
ITMO20110053A1 (en) * 2011-03-07 2012-09-08 Meta System Spa PROCEDURE FOR THE CONSTRUCTION OF A SENSOR DEVICE, IN PARTICULAR OF A SENSOR DEVICE THAT CAN BE USED IN CAR PARKING SYSTEMS FOR VEHICLES
US8671762B2 (en) 2008-07-31 2014-03-18 Robert Bosch Gmbh Ultrasonic sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3137745A1 (en) * 1981-09-23 1983-04-07 Egon 5000 Köln Gelhard SENSOR FOR PERFORMING THE DISTANCE MEASUREMENT ACCORDING TO THE ULTRASONIC ECHOPRINZIP

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3137745A1 (en) * 1981-09-23 1983-04-07 Egon 5000 Köln Gelhard SENSOR FOR PERFORMING THE DISTANCE MEASUREMENT ACCORDING TO THE ULTRASONIC ECHOPRINZIP

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Funk Bastler, H.4, 1927, S.50-51 *
Funkschau, H.15, 1957, S.678 *

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3812182A1 (en) * 1988-04-13 1989-10-26 Swf Auto Electric Gmbh Transducer, particularly ultrasonic transducer for a distance measuring device installed in a motor vehicle
DE3939387A1 (en) * 1989-11-29 1991-06-06 Swf Auto Electric Gmbh Ultrasonic distance warning system esp. for motor vehicles - has aperture covering membrane carrying piezo-plate to eliminate group echos
EP0678853A2 (en) 1994-04-21 1995-10-25 ITT Automotive Europe GmbH Ultrasonic transducer with asymmetric radiation characteristic
DE4413894A1 (en) * 1994-04-21 1995-10-26 Teves Gmbh Alfred Ultrasonic transducer with asymmetrical radiation characteristics
EP0678853A3 (en) * 1994-04-21 1997-05-21 Teves Gmbh Alfred Ultrasonic transducer with asymmetric radiation characteristic.
DE4413894C2 (en) * 1994-04-21 2002-12-12 Teves Gmbh Alfred Bending converter in pot form
DE19528474A1 (en) * 1995-08-03 1997-02-06 Teves Gmbh Alfred Ultrasonic transducer with holder to mounting on motor vehicle shock absorber - has spring for holding transducer at predetermined distance from inner surface of shock absorber
DE19528474C2 (en) * 1995-08-03 2002-10-24 Teves Gmbh Alfred Ultrasonic transducer that can be attached to a bumper of a motor vehicle
DE19601656A1 (en) * 1996-01-18 1997-07-24 Teves Gmbh Alfred Damped ultrasonic transducer
DE19601656B4 (en) * 1996-01-18 2009-07-16 Valeo Schalter Und Sensoren Gmbh Steamed ultrasonic transducer
EP0802521A3 (en) * 1996-04-16 1999-09-01 Robert Bosch Gmbh Transducer for sending and/or receiving of acoustic signals
DE19614885C1 (en) * 1996-04-16 1997-09-04 Bosch Gmbh Robert Sensor for sending and / or receiving acoustic signals
EP0802521A2 (en) * 1996-04-16 1997-10-22 Robert Bosch Gmbh Transducer for sending and/or receiving of acoustic signals
DE19651033A1 (en) * 1996-12-09 1998-06-10 Sennheiser Electronic Electrodynamic converter
DE19714606A1 (en) * 1997-04-09 1998-10-15 Itt Mfg Enterprises Inc Ultra sound transmitter and receiver for motor vehicle distance warning system
WO1999001234A3 (en) * 1997-06-30 1999-04-22 Bosch Gmbh Robert Ultrasonic transducer
US6465935B1 (en) 1997-06-30 2002-10-15 Robert Bosch Gmbh Ultrasonic transducer
WO1999001234A2 (en) * 1997-06-30 1999-01-14 Robert Bosch Gmbh Ultrasonic transducer
WO1999018563A2 (en) * 1997-10-07 1999-04-15 Robert Bosch Gmbh Ultrasonic transducer
WO1999018563A3 (en) * 1997-10-07 1999-06-10 Bosch Gmbh Robert Ultrasonic transducer
US6374676B1 (en) 1997-10-07 2002-04-23 Robert Bosch Gmbh Ultrasonic transducer
WO1999030313A1 (en) * 1997-12-10 1999-06-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Ultrasonic transducer with a cup-shaped support
DE19912772C2 (en) * 1998-03-26 2003-07-10 Shih Hsiung Li Ultrasonic sensor for distance measurement
DE19839598C2 (en) * 1998-08-31 2001-06-28 Itt Mfg Enterprises Inc Mounting sleeve for a transducer for inclined mounting against a plate
DE19839598A1 (en) * 1998-08-31 2000-03-09 Itt Mfg Enterprises Inc Mounting sleeve for ultrasonic transducer for inclined attachment to plate, e.g. for vehicle parking aid, has peripheral, essentially annular fitting whose outer surface height varies over its circumference
US6287261B1 (en) 1999-07-21 2001-09-11 Scimed Life Systems, Inc. Focused ultrasound transducers and systems
WO2001005305A1 (en) * 1999-07-21 2001-01-25 Boston Scientific Limited Focused ultrasound transducers and systems
EP1723910A3 (en) * 1999-07-21 2007-07-18 Boston Scientific Limited Focused ultrasound transducers and systems
EP1723910A2 (en) * 1999-07-21 2006-11-22 Boston Scientific Limited Focused ultrasound transducers and systems
FR2800229A1 (en) * 1999-10-22 2001-04-27 Thomson Marconi Sonar Sas Surface boat underwater acoustic signal transmitter having flexing piezoelectric strip underside cap section inside air cavity and outer cap face water exposed
WO2001029820A1 (en) * 1999-10-22 2001-04-26 Thomson Marconi Sonar S.A.S. Underwater broadband acoustic transducer
US6617765B1 (en) 1999-10-22 2003-09-09 Thales Underwater Systems S.A.S. Underwater broadband acoustic transducer
DE10000924A1 (en) * 2000-01-12 2001-07-19 Volkswagen Ag Ultrasonic sensor, especially for vehicle distance measurement device, has membrane with resonance body mechanically separate from housing with electronics, electrical connecting element
DE10000924B4 (en) * 2000-01-12 2011-11-24 Volkswagen Ag ultrasonic sensor
DE10009129A1 (en) * 2000-02-26 2001-08-30 Volkswagen Ag Ultrasonic sensor has pot-shaped vibration element whose floor acts as membrane with at least two disc-shaped piezoelectric transducers attached to membrane and adjacent to each other
DE10153638B4 (en) * 2001-07-02 2004-01-29 Shih Hsiung Li Ultrasonic sensor for distance measurement
DE10153638A1 (en) * 2001-07-02 2003-05-22 Shih Hsiung Li Ultrasonic sensor for distance measurement, has piezoelectric ceramic element which generates specific detecting area according to shape of tapered rectangular chamber
EP1315144A3 (en) * 2001-11-27 2010-03-17 Hydrometer GmbH Ultrasonic transducer and flowmeter
DE10159679A1 (en) * 2001-11-30 2003-06-12 Valeo Schalter & Sensoren Gmbh Ultrasonic sensor unit and manufacturing method
US8671762B2 (en) 2008-07-31 2014-03-18 Robert Bosch Gmbh Ultrasonic sensor
DE102009056268A1 (en) * 2009-12-01 2011-06-09 Techem Energy Services Gmbh Hazard detector and method for detecting objects in the vicinity of the danger detector
ITMO20110053A1 (en) * 2011-03-07 2012-09-08 Meta System Spa PROCEDURE FOR THE CONSTRUCTION OF A SENSOR DEVICE, IN PARTICULAR OF A SENSOR DEVICE THAT CAN BE USED IN CAR PARKING SYSTEMS FOR VEHICLES
WO2012120354A1 (en) * 2011-03-07 2012-09-13 Meta System S.P.A. Process for the manufacture of a sensor device, in particular of a sensor device usable in parking-aid systems for vehicles and corresponding sensor device
EP2684186B1 (en) 2011-03-07 2016-05-18 Meta System S.p.A. Process for the manufacture of a sensor device usable in parking-aid systems for vehicles and corresponding sensor device

Similar Documents

Publication Publication Date Title
DE3441684A1 (en) Electro-acoustic transducer
DE4410895B4 (en) Method and device for concealed installation of an ultrasonic sensor in an outer part of a motor vehicle
DE19917862B4 (en) ultrasonic sensor
DE3137745A1 (en) SENSOR FOR PERFORMING THE DISTANCE MEASUREMENT ACCORDING TO THE ULTRASONIC ECHOPRINZIP
EP0507892B1 (en) Ultrasonic transducer
DE102005017536B4 (en) ultrasonic sensor
DE4238924A1 (en) Electroacoustic transducer
DE102006038598A1 (en) Ultrasound producing device e.g. ultrasonic sensor such as distance sensor, for motor vehicle i.e. passenger car, has ultrasonic transducer mechanically coupled to thin-walled inner side of bumper
DE102007047274A1 (en) ultrasonic sensor
DE102011105013A1 (en) An ultrasonic sensor device for a vehicle and an arrangement with an ultrasonic sensor device
DE102008049081A1 (en) ultrasonic sensor
DE10123612B9 (en) Ultrasonic wave transmitter / receiver
DE3939387A1 (en) Ultrasonic distance warning system esp. for motor vehicles - has aperture covering membrane carrying piezo-plate to eliminate group echos
DE102008017067A1 (en) Electro-acoustic transducer for transducer arrangement, has aluminum housing, where layer is provided for overlaying transducer on surface, and projecting area surrounds inner space according to layer
DE19727877A1 (en) Ultrasonic transducer
US4110727A (en) Method of manufacturing transducer
DE102011121095A1 (en) Arrangement with vehicle component e.g. bumper of motor car, has sensor housing in which ultrasonic transducer is arranged regionally and through which sensor is connected to component partially formed from sound absorbing material
WO2001061375A1 (en) Ultrasonic sensor
EP1038290B1 (en) Ultrasonic transducer with a cup-shaped support
DE10153638B4 (en) Ultrasonic sensor for distance measurement
DE102013211630A1 (en) Electroacoustic transducer
DE102019220204A1 (en) Sound pick-up for the detection of external noises for a vehicle
DE3013684C2 (en) Knock sensor
DE102016101007B4 (en) Ultrasonic sensor for a motor vehicle with a waterproof covering device, driver assistance system and motor vehicle
DE102012014199A1 (en) Device for detecting flooding of motor vehicles, has damping element by which front side of diaphragm is partially covered, where damping element lies at front side, particularly in continuous contact with front side

Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8131 Rejection