EP0678853B1 - Ultraschallwandler mit asymmetrischer Strahlungscharakteristik - Google Patents
Ultraschallwandler mit asymmetrischer Strahlungscharakteristik Download PDFInfo
- Publication number
- EP0678853B1 EP0678853B1 EP95105504A EP95105504A EP0678853B1 EP 0678853 B1 EP0678853 B1 EP 0678853B1 EP 95105504 A EP95105504 A EP 95105504A EP 95105504 A EP95105504 A EP 95105504A EP 0678853 B1 EP0678853 B1 EP 0678853B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pot
- shaped
- bending transducer
- recesses
- segment
- 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
- 230000005855 radiation Effects 0.000 title description 16
- 239000012528 membrane Substances 0.000 claims description 20
- 238000005452 bending Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 2
- 241000446313 Lamella Species 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- 238000013016 damping Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 101100298222 Caenorhabditis elegans pot-1 gene Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001959 radiotherapy Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000002604 ultrasonography Methods 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
- 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
Definitions
- the invention relates to an electroacoustic bending transducer with the features according to the preamble of claim 1.
- the Radiation or reception characteristics of a Ultrasonic transducer is not linearly symmetrical, but asymmetrical.
- a Such field deformation serves, among other things. to the field to the radiotherapy room better.
- This can apply to Monitoring systems, but also for distance warning devices in Motor vehicles.
- the radiation field in the horizontal plane has a large opening angle while it is only a small one in the vertical plane Has opening angle.
- Such, essentially fan-shaped field of a distance warning device reacts less heavily on the ground, not the way of the vehicle hindering bumps, but also increases laterally from the plane of symmetry of the vehicle Obstacles true.
- a A series of proposals aims at the geometric Radiation conditions for the waves to change, for example a funnel-shaped geometry. Such measures are, however only effective if they influence the radiation geometrical areas that are used for shading the Radiation field should be compared to that Wavelength of the radiation are relatively large. The above Measures are for example in DE-OS 32 21 935 and DE-OS 38 12 182.
- EP-OS 048 958 shows a pot converter, in which the radiation geometry of the ultrasonic waves thereby is influenced that a diaphragm is placed in front of the membrane, which part of the membrane is already forward hides emitted waves.
- An ultrasonic transducer is known from US-A-4,437,032, provided with the absorption buffer within the cylinder that act on two circular surfaces of the membrane determine the radiation properties of the transducer.
- the invention is therefore based on a bending transducer according to the EP-A-0 308 899.
- the object of the invention is to develop a new type Specify the form of such a converter, which is relatively simple can be produced and which results in an aging-resistant, asymmetrical shape to be produced with sufficient accuracy the radiation or reception field of an ultrasound transducer leads.
- the invention therefore consists of the radiation surface the membrane is preferably a segment of a circle Take out recess or this recess in the Form membrane.
- the membrane can be attached to one Weight ring (see DE-A-33 01 848) can be coupled.
- the features of the invention are in a further development of The invention is particularly suitable for a bending transducer, however that in the outer lateral surface of the cylindrical side wall a circumferential groove is inserted below the membrane.
- a circumferential groove is inserted below the membrane.
- both limiting to the floor as well as to the top is recommended to provide opposing recesses that each have a circular segment-shaped contour.
- the bending transducer has two symmetrical to each other opposite circular segment-shaped recesses in the Membrane. These can be used, for example, when pouring the pot already be taken into account or in this by cutting Shaping be molded.
- a particularly simple manufacture of the membrane pot results is characterized in that the circular segment-shaped recesses in their depth reach approximately to the circumferential groove. After that can be used in particular for machining relatively wide tolerances are manufactured than that only Recess in their along the central axis of the pot extending depth must extend to the groove.
- the the Recess-limiting end face of the converter pot partially formed by the inner side wall of the groove.
- Aluminum is preferably used as the material for the converter pot used, the converter pot in the casting process, but also can be produced by machining.
- Fig. 3 shows the section through a converter pot 1, which for receiving sealing rings with circumferential grooves 2, 3 and 4 is provided.
- the one acting as a ring-shaped weight Cylinder 5 of the converter 1 is at its bottom with a Membrane 6 closed.
- Fig. 1 shows the view of the transducer 3 seen from the direction R in FIG. 3rd
- two edges 13, 14 are also shown in broken lines, which represent the bottom 15 (see FIG. 3) of the groove 2, up to which the recesses reach 7.8. Further can look at the transducer pot according to FIG. 2 Viewers can still see the groove wall 16 by the Formation of the recesses visible to the viewer becomes. The edge is only shown in broken lines in FIG. 2, since it is not imperative that the recesses 7,8 be as deep are inserted into the cylinder 5. It is also remarkable that by inserting the recesses 7.8 in the 4 to the interior of the converter 1 only a thin wall 20, 21 remains.
- the transducer resonance vibration should be so be that over the membrane a half wave of vibration stands, because then the desired one described above with certainty Radiation form occurs.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Description
- Fig. 1
- eine Ansicht von hinten durch das offene Ende des Wandlertopfes in den Wandlertopf,
- Fig. 2
- eine Ansicht auf die Abstrahlungsfläche des Wandlertopfs von vorn gesehen,
- Fig. 3
- einen Schnitt längs der Linie A-A in Fig. 2 durch den Wandler und
- Fig. 4
- einen Schnitt längs der Linie B-B durch den Wandler 1 in Fig. 2.
Claims (8)
- Elektroakustischer Biegewandler (1) in Topfform, mit einem Zylinder (5), der an seinem Boden mit einer Membran (6) aus piezoelektrisch inaktivem Material, die mit einem Blättchen aus piezoelektrischem Material verbunden ist, welches im wesentlichen zentral auf der der Abstrahlungsfläche der Membran gegenüberliegenden Membraninnenfläche angeordnet ist, verschlossen ist, dadurch gekennzeichnet, daß an den Seitenwänden des Zylinders (5) im Randbereich der Abstrahlungsfläche der Membran (6) zumindest eine, vorzugsweise kreissegmentförmige, Ausnehmung (7, 8) vorgesehen ist.
- Biegewandler nach Anspruch 1, dadurch gekennzeichnt, daß in die äußere Mantelfläche der zylinderförmigen Seitenwand unterhalb der Membran (6) eine umlaufende Nut (2) eingefügt ist.
- Biegewandler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß er zwei einander gegenüberliegende Ausnehmungen (7, 8) aufweist, die eine kreissegmentförmige Kontur besitzen.
- Biegewandler nach Anspruch 2 oder Anspruch 2 und 3, dadurch gekennzeichnet, daß die kreissegmentförmigen Ausnehmungen (7, 8) in ihrer Tiefe etwa bis zu der umlaufenden Nut (2) reichen.
- Biegewandler nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Höhe der kreissegmentförmigen Ausnehmungen (7,8) in radialer Richtung kleiner als die Dicke der Zylinderwand des topfförmigen Biegewandlers ist.
- Biegewandler nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die parallel zur Längsachse des Wandlertopfes verlaufenden Seitenwände der Ausnehmungen (7,8) zueinander parallel sind.
- Biegewandler nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß der Wandlertopf etwa 14 mm hoch und die ringförmige Zylinderwand etwa 2,8 mm stark ist und die kreissegmentförmigen Ausnehmungen in radialer Richtung die größte Höhe von 2,3 mm haben, wobei der Außendurchmesser des Wandlertopfes 16,5 mm beträgt.
- Biegewandler nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß der Wandlertopf aus Aluminium gefertigt ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4413894A DE4413894C2 (de) | 1994-04-21 | 1994-04-21 | Biegewandler in Topfform |
DE4413894 | 1994-04-21 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0678853A2 EP0678853A2 (de) | 1995-10-25 |
EP0678853A3 EP0678853A3 (de) | 1997-05-21 |
EP0678853B1 true EP0678853B1 (de) | 2001-07-18 |
Family
ID=6516054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95105504A Expired - Lifetime EP0678853B1 (de) | 1994-04-21 | 1995-04-12 | Ultraschallwandler mit asymmetrischer Strahlungscharakteristik |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0678853B1 (de) |
DE (2) | DE4413894C2 (de) |
ES (1) | ES2158008T3 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19601656B4 (de) * | 1996-01-18 | 2009-07-16 | Valeo Schalter Und Sensoren Gmbh | Bedämpfter Ultraschallwandler |
DE19614885C1 (de) * | 1996-04-16 | 1997-09-04 | Bosch Gmbh Robert | Sensor zum Senden und/oder Empfangen akustischer Signale |
DE19727877A1 (de) | 1997-06-30 | 1999-01-07 | Bosch Gmbh Robert | Ultraschallwandler |
US6322532B1 (en) * | 1998-06-24 | 2001-11-27 | 3M Innovative Properties Company | Sonophoresis method and apparatus |
JP3324593B2 (ja) | 1999-10-28 | 2002-09-17 | 株式会社村田製作所 | 超音波振動装置 |
DE10304001A1 (de) * | 2003-02-01 | 2004-08-12 | Valeo Schalter Und Sensoren Gmbh | Topfförmige Menbrane für einen Sensor, insbesondere einen Ultraschallsensor und Sensor, insbesondere Ultraschallsensor |
EP1906383B1 (de) * | 2006-09-29 | 2013-11-13 | Tung Thih Electronic Co., Ltd. | Ultraschallgerät-Sende-/Empfangsvorrichtung |
DE102008040905A1 (de) * | 2008-07-31 | 2010-02-04 | Robert Bosch Gmbh | Ultraschallsensor |
DE102014219630A1 (de) | 2014-09-26 | 2016-03-31 | Sennheiser Electronic Gmbh & Co. Kg | Elektrodynamischer Schallwandler |
DE102015106240A1 (de) | 2015-04-23 | 2016-10-27 | Valeo Schalter Und Sensoren Gmbh | Ultraschallsensor für ein Kraftfahrzeug mit einer Durchgangsöffnungen aufweisenden Membran, Verkleidungsanordnung sowie Kraftfahrzeug |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU886325A1 (ru) * | 1980-01-04 | 1981-11-30 | Научно-Исследовательский Институт Интроскопии | Пьезопреобразователь |
DE3036081A1 (de) * | 1980-09-25 | 1982-04-29 | Egon Gelhard | Verfahren zur distanzmessung nach dem ultraschall-echoprinzip sowie schaltungsanordnung und geraete insbesondere am kraftfahrzeug |
DE3137745A1 (de) * | 1981-09-23 | 1983-04-07 | Egon 5000 Köln Gelhard | Sensor fuer die durchfuehrung der distanzmessung nach dem ultraschalll-echoprinzip |
DE3221935A1 (de) * | 1982-06-11 | 1984-02-16 | M W Stoelzel Kg Industrievertr | Elektronisches kfz-abstandmessgeraet |
DE3301848C2 (de) * | 1983-01-20 | 1984-11-08 | Siemens AG, 1000 Berlin und 8000 München | Ultraschallwandler |
DE3441684A1 (de) * | 1984-11-15 | 1986-05-15 | SWF Auto-Electric GmbH, 7120 Bietigheim-Bissingen | Elektroakustischer wandler |
DE8712391U1 (de) * | 1987-09-12 | 1987-12-10 | Nauroth, Heinz, Dipl.-Finanzwirt, 5300 Bonn | Ultraschallsende- und Empfangselement einer nach dem Echoprinzip arbeitenden Entfernungsmeßeinrichtung, insbesondere für die Rückfahrüberwachung bei Kraftfahrzeugen |
DE3732410A1 (de) * | 1987-09-25 | 1989-04-13 | Siemens Ag | Ultraschallwandler mit astigmatischer sende-/empfangscharakteristik |
DE3812182C2 (de) * | 1988-04-13 | 1997-05-15 | Teves Gmbh Alfred | Wandler, insbesondere Ultraschallwandler für ein in ein Kraftfahrzeug eingebautes Entfernungsmeßgerät |
DE3826799C2 (de) * | 1988-08-06 | 1995-08-31 | Teves Gmbh Alfred | Ultraschallwandler |
DE3939387A1 (de) * | 1989-11-29 | 1991-06-06 | Swf Auto Electric Gmbh | Abstandswarnanlage, insbesondere fuer kraftfahrzeuge |
DE3941634A1 (de) * | 1989-12-15 | 1991-06-20 | Siemens Ag | Schallisolierte halterung eines ultraschallwandlers |
DE3941933C2 (de) * | 1989-12-19 | 1997-01-30 | Siemens Ag | Ultraschallwandler für Luftströmungsmessung, insbesondere zur Luftmengenmessung bei Verbrennungsmotoren |
-
1994
- 1994-04-21 DE DE4413894A patent/DE4413894C2/de not_active Expired - Fee Related
-
1995
- 1995-04-12 ES ES95105504T patent/ES2158008T3/es not_active Expired - Lifetime
- 1995-04-12 DE DE59509415T patent/DE59509415D1/de not_active Expired - Lifetime
- 1995-04-12 EP EP95105504A patent/EP0678853B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0678853A2 (de) | 1995-10-25 |
DE4413894C2 (de) | 2002-12-12 |
DE59509415D1 (de) | 2001-08-23 |
ES2158008T3 (es) | 2001-09-01 |
EP0678853A3 (de) | 1997-05-21 |
DE4413894A1 (de) | 1995-10-26 |
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