EP1283516A2 - Ultraschallwandler mit einer zur Schwingung anregbaren Membran und mit einem auf der Membranfläche angeordneten Piezoschwinger - Google Patents
Ultraschallwandler mit einer zur Schwingung anregbaren Membran und mit einem auf der Membranfläche angeordneten Piezoschwinger Download PDFInfo
- Publication number
- EP1283516A2 EP1283516A2 EP02013779A EP02013779A EP1283516A2 EP 1283516 A2 EP1283516 A2 EP 1283516A2 EP 02013779 A EP02013779 A EP 02013779A EP 02013779 A EP02013779 A EP 02013779A EP 1283516 A2 EP1283516 A2 EP 1283516A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ultrasonic transducer
- membrane surface
- constrictions
- membrane
- constriction
- 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
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 80
- 238000013016 damping Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 2
- 238000002604 ultrasonography Methods 0.000 claims 1
- 230000005855 radiation Effects 0.000 description 13
- 238000001514 detection method Methods 0.000 description 5
- 238000003801 milling Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004382 potting 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
- G10K9/125—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 with a plurality of active elements
-
- 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 ultrasonic transducer with a to the vibration excitable membrane, which is a thin formed and elongated membrane surface includes and with at least one arranged on the membrane surface Piezoelectric oscillator. Due to the elongated geometry of the Membrane surface, such ultrasonic transducer a Radiation characteristic in one direction, especially in the horizontal direction, a larger one Beam angle and in another direction, especially in vertical direction, has a smaller angle of radiation.
- the present invention is therefore the task on to develop an ultrasonic sensor, the one Abstrahl characterizing has that no unwanted Owns.
- the ultrasonic sensor should nevertheless in one direction, namely in the horizontal, one have larger viewing angles than in the vertical Direction.
- the thin formed Membrane surface of anti-vibration agents is bounded.
- Vibration-damping agent may be the membrane be provided limiting housing.
- additional media such as vibration-absorbing Potting compound or the like. Be provided.
- the mirror axis runs along the Longitudinal axis and / or the transverse axis of the membrane surface. Due to the symmetrical training can be a very uniform and thus advantageous swinging the Membrane surface can be realized.
- a further embodiment of the invention provides that the constriction or constrictions on the one Longitudinal the constriction or constrictions on the touch the other long side.
- the membrane surface divides in this case in two membrane surface portions, which through the touching constrictions are separated from each other.
- Each membrane surface section here has its own Piezo oscillator on. Due to the spatial proximity of the Membrane surface sections results in an advantageous Radiation.
- a particularly preferred embodiment of the invention characterized in that the membrane surface in the Areas between two adjacent constrictions one has largely round contour. Are only two themselves provided opposite constrictions so extends the round contour of a constriction over the Face area of the membrane surface to the other Constriction.
- a particularly advantageous vibration characteristic of Membrane surface results when the round contour a Circle contour is.
- one piezoelectric oscillator in the middle in each section the membrane surface is arranged, of the Frontal area of the membrane surface and of the two arranged adjacent to this end face area, itself bounded opposite constrictions.
- the Membrane area can be particularly easy in this area too Vibrations are stimulated.
- a Piezo oscillator in the middle between two opposite ones Einhürungen is arranged.
- the ultrasonic transducer a cup-shaped housing, the pot bottom as Membrane surface is formed.
- the membrane surface becomes this advantageously from the walls of the cup-shaped Enclosed enclosure.
- the walls form Here, the vibration-suppressing agents that the Surround membrane area.
- the membrane or the membrane surface and the housing may also be integrally formed.
- the membrane surface by means of Milling or extruding be made, where the housing circular, adjacent, overlapping or not touching round, and in particular circular, cylindrical shapes are formed.
- Such an ultrasonic transducer is particularly realize cost-effective.
- an ultrasonic transducer is each advantageously a piezoelectric vibrator on the Membrane surface in the region of the central longitudinal axis of Cylinder shapes arranged.
- FIG. 1 shows an ultrasonic transducer 10, which is a cup-shaped housing 12, the pot bottom as Membrane surface 14 is formed.
- the longitudinal axis of the membrane surface 14 is with designated by the reference numeral 18. It runs in the installed state of the ultrasonic transducer against the illustration shown vertically.
- the membrane surface has on their longitudinal sides in each case a constriction 20 and 22nd on.
- the constrictions 20 and 22 are in the middle region the respective longitudinal side of the membrane surface 14 is arranged.
- the constrictions 20 and 22 along the Longitudinal axis 18 arranged mirror-symmetrically to each other.
- the Membrane surface 14 is made up of two circular Membrane surface sections 14.1 and 14.2 together, which is in the area between the two constrictions 20 and 22 overlap.
- the membrane surface 14 is thus of two Circular contours bordered, each of a Constriction 20 on the front side regions 24 and 26 too the other constriction 22 extend.
- the constrictions 20, 22 are therefore each one in the direction of the longitudinal axis 18 pointed, two intersecting Circular lines formed contour realized.
- the membrane surface 14 is preferably by end milling or extruding produced from the housing 12 two overlapping cylindrical shapes 34 with one each Mold circle contour.
- Piezo oscillator 28 on the inside of the membrane surface 14th arranged. Due to such an arrangement can be achieved that the membrane surface 14 along its Longitudinal axis 18 excited largely uniformly to vibrate can be. The amplitude is in the range of Midpoints of the two circle contours almost as big as in the membrane center, in which the piezoelectric vibrator 28th is arranged.
- the surrounding the membrane surface 14 walls 16 of the housing 12 have a vibration suppressing effect and thus contribute to one uniform emission characteristics.
- FIG. 11 shows the emission characteristic of the Ultrasonic transducer 10 in the longitudinal and transverse directions of the Membrane surface 14.
- the radiation characteristic in Longitudinal direction is designated by the reference numeral 37.
- the in the transverse direction the reference numeral 30. From Figure 11 is clearly that in the longitudinal as well as in the transverse direction respectively is radiated with a main lobe, without the Abstrahlkeulen have Einsattelungen that the Restrict detection range of the ultrasonic transducer 10.
- FIG. 11 shows that the emission angle in the transverse direction or in the horizontal direction (characteristic 30) is greater than that in the longitudinal direction or vertical Direction (characteristic 32).
- Geometry of the ultrasonic transducer 10 results in a very uniform and steady course of the illustrated Radiation characteristics 30 and 32.
- On the abscissa is the respective beam angles in degrees from -90 ° to + 90 ° specified.
- the ordinate gives the sound level in dB qualitatively again.
- the ultrasonic transducer 40 shown in FIGS. 3 and 4 differs from the ultrasonic transducer according to FIG. 1 and 2 only in that instead of a Piezo oscillator two piezoelectric vibrators 42 are provided, the each in the centers of the circular sections 14.1 and 14.2 of the membrane surface 14 are arranged.
- FIGS 5 and 6 show another Ultrasonic transducer 50, in which the two Constrictions 20 and 22 touch.
- the two Constrictions 20 and 22 thus divide the membrane surface 14 in two separate membrane surface sections 14.1 and 14.2.
- the two membrane surface sections 14.1 and 14.2 each have a circular contour in which Center each one piezoelectric vibrator 42 is arranged.
- the two membrane surface portions 14.1. and 14.2 by means of Extrusions or end mills produced from the Housing 12 two non-touching, side by side arranged cylinder molds 52 form such.
- FIG 7 is another inventive Ultrasonic transducer 60 shown having a membrane surface 14, which along its two longitudinal sides two each opposite constrictions 20 and 22 and 62 and 64 having.
- the membrane surface 14 has between two adjacent constrictions 20, 22, 64, 62 one each circular outline.
- each one Piezo oscillator 42 centered in the respective section of Membrane surface arranged by the respective is surrounded by a circular contour.
- the ultrasonic transducer 70 shown in FIG. 8 has a membrane surface 14, the membrane surface 14 of the Ultrasonic transducer 60 is identical. In the Embodiment according to Figure 8, however, are only two Piezo oscillator 28 is provided, between each two opposite constrictions 20, 22 and 62, 64th are arranged.
- FIG. 9 shows a further inventive device Ultrasonic transducer 80, the membrane surface 14 has a contour that of two overlapping, elliptical Lines is formed.
- a piezoelectric vibrator 28th between the two constrictions 20 and 22 are arranged be.
- a piezoelectric vibrator 42 is arranged in the middle of the the elliptical lines formed membrane sections in each case.
- the Piezo oscillators 42 are shown in dashed lines in FIG.
- the membrane surface 14 of the illustrated in Figure 10 Ultrasonic transducer 90 has a rectangular shape, which provides rounded corners. At the two long sides are round trained Constrictions 20 and 22 available. Between the two Constrictions 20 and 22 is a piezoelectric vibrator 28th arranged. Alternatively conceivable is an arrangement of two piezoelectric vibrators 42, dashed in the figure 10 are shown.
- the ultrasonic transducers 10, 40 shown in the figures, 50, 60, 70, 80 and 90 have in common that they are one of the Figure 11 have corresponding emission characteristic.
- the two ultrasonic transducers 60 and 70 are distinguished However, characterized in that the radiation angle in horizontal direction or in the transverse direction of the Membrane surface 14 is greater than that of the Ultrasonic transducers 10, 40 and 50. All ultrasonic transducers have in common that the emitted ultrasonic lobes have no significant Einsattelieux, the Restrict the detection range in an undesirable manner.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
- Figur 1 und 2
- eine erste Ausführungsform eines erfindungsgemäßen Ultraschallwandlers in verschiedenen Ansichten;
- Figur 3 und 4
- eine zweite Ausführungsform eines erfindungsgemäßen Ultraschallwandlers in verschiedenen Ansichten;
- Figur 5 und 6
- eine dritte Ausführungsform eines erfindungsgemäßen Ultraschallwandlers in verschiedenen Ansichten;
- Figur 7 bis 10
- vier weitere erfindungsgemäße Ultraschallwandler; und
- Figur 11
- die Abstrahlcharakteristik der erfindungsgemäßen Ultraschallwandler.
Claims (17)
- Ultraschallwandler (10, 40, 50, 60, 70, 80, 90) mit einer zur Schwingung anregbaren Membran, die eine dünn ausgebildete und längliche Membranfläche (14) umfasst, und mit wenigstens einem auf der Membranfläche angeordneten Piezoschwinger (28, 42), dadurch gekennzeichnet, dass die Membranfläche (14) an ihren Längsseiten jeweils wenigstens eine Einschnürung (20, 22, 62, 64) aufweist.
- Ultraschallwandler (10, 40, 50, 60, 70, 80, 90) nach Anspruch 1, dadurch gekennzeichnet, dass die Membranfläche (14) von schwingungsdämpfenden Mitteln (16) umgrenzt ist.
- Ultraschallwandler (10, 40, 50, 60, 70, 80, 90) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Einschnürung (20) bzw. Einschnürungen (20, 62) an der einen Längsseite zu der Einschnürung (22) bzw. den Einschnürungen (22, 64) an der anderen Längsseite spiegelsymmetrisch ausgebildet ist bzw. sind.
- Ultraschallwandler (10, 40, 50, 60, 70, 80, 90) nach Anspruch 3, dadurch gekennzeichnet, dadurch gekennzeichnet, dass die Spiegelachse entlang der Längsachse (18) und/oder der Querachse der Membranfläche (14) verläuft.
- Ultraschallwandler (50) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Einschnürung (20) bzw. Einschnürungen an der einen Längsseite die Einschnürung (22) bzw. Einschnürungen an der anderen Längsseite berühren.
- Ultraschallwandler (50) nach Anspruch 3 bis 5, dadurch gekennzeichnet, dass sich jeweils die spiegelsymmetrisch gegenüberliegenden Einschnürungen (20, 22) berühren.
- Ultraschallwandler (10, 40, 50, 60, 70, 80) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Membranfläche (14) in den Bereichen zwischen zwei benachbarten Einschnürungen (20, 22, 64, 62) eine weitgehend runde Kontur aufweist.
- Ultraschallwandler (10, 40, 50, 60, 70) nach Anspruch 7, dadurch gekennzeichnet, dass die runde Kontur eine Kreiskontur ist.
- Ultraschallwandler (40, 50, 60, 80, 90) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass je ein Piezoschwinger (42) mittig in dem jeweiligen Abschnitt der Membranfläche (14) angeordnet ist, der von dem Stirnseitenbereich (24) der Membranfläche und den zwei diesem Stirnseitenbereich (24) benachbart angeordneten, sich gegenüberliegenden Einschnürungen (20, 22; 62, 64) umgrenzt wird.
- Ultraschallwandler (40, 50, 60, 80, 90) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass je ein Piezoschwinger (42) in dem jeweiligen Abschnitt der Membranfläche (14) mittig angeordnet ist, der von je zwei benachbarten (20, 62) und deren gegenüberliegenden Einschnürungen (22, 64) umgrenzt wird.
- Ultraschallwandler (10, 70, 80, 90) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass ein Piezoschwinger (28) mittig zwischen zwei sich gegenüberliegenden Einschnürungen (20, 22; 62, 64) angeordnet ist.
- Ultraschallwandler (10, 40, 50, 60, 70, 80, 90) nach einem der vorhergehenden Ansprüche dadurch gekennzeichnet, dass der Ultraschallwandler ein topfförmiges Gehäuse (12) aufweist, dessen Topfboden als Membranfläche (14) ausgebildet ist.
- Ultraschallwandler (10, 40, 50, 60, 70, 80, 90) nach Anspruch 12, dadurch gekennzeichnet, dass die Membranfläche (14) von den Wänden (16) des topfförmigen Gehäuses (12) umgrenzt ist.
- Ultraschallwandler (10, 40, 50, 60, 70, 80, 90) nach Anspruch 12, dadurch gekennzeichnet, dass die Wände (16) die schwingungsdämpfendenden Mittel nach Anspruch 2 bilden.
- Ultraschallwandler (10, 40, 50, 60, 70, 80, 90) nach Anspruch 12, 13 oder 14, dadurch gekennzeichnet, dass das Gehäuse (12) und die Membran bzw. Membranfläche einstückig ausgebildet ist.
- Ultraschallwandler (10, 40, 50, 60, 70, 80, 90) nach Anspruch 15, dadurch gekennzeichnet, dass die Membranfläche (14) mittels Stirnfräsern oder mittels Fließpressen hergestellt ist, wobei aus dem Gehäuse (12) kreisrunde, aneinander angrenzende, überlappende oder sich nicht berührende runde, insbesondere kreisrunde Zylinderformen (34, 52, 66) ausgeformt sind.
- Ultraschallwandler (40, 50, 60, 80, 90) nach Anspruch 16, dadurch gekennzeichnet, dass je ein Piezoschwinger (42) auf der Membranfläche (14) im Bereich der Mittellängsachse der Zylinderformen (34, 52, 66) angeordnet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001138892 DE10138892A1 (de) | 2001-08-08 | 2001-08-08 | Ultraschallwandler |
DE10138892 | 2001-08-08 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1283516A2 true EP1283516A2 (de) | 2003-02-12 |
EP1283516A3 EP1283516A3 (de) | 2008-07-30 |
EP1283516B1 EP1283516B1 (de) | 2016-07-06 |
Family
ID=7694766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02013779.0A Expired - Lifetime EP1283516B1 (de) | 2001-08-08 | 2002-06-21 | Ultraschallwandler mit einer zur Schwingung anregbaren Membran und mit einem auf der Membranfläche angeordneten Piezoschwinger |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1283516B1 (de) |
DE (1) | DE10138892A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005064589A1 (de) * | 2003-12-19 | 2005-07-14 | Valeo Schalter Und Sensoren Gmbh | Ultraschallwandlervorrichtung |
WO2007113503A2 (en) * | 2006-03-31 | 2007-10-11 | University Of Strathclyde | Ultrasonic transducer/receiver |
EP2221802A1 (de) * | 2009-02-19 | 2010-08-25 | Tung Thih Electronic Co., Ltd. | Ultraschallwandler mit hantelförmiger Kammer |
US7982366B2 (en) | 2008-12-16 | 2011-07-19 | Tung Thih Electronic Co., Ltd. | Ultrasound transducer with a dumbbell-shaped chamber |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011079646A1 (de) * | 2011-07-22 | 2013-02-07 | Robert Bosch Gmbh | Ultraschallsensorvorrichtung zum Erfassen und/oder Senden von Ultraschall |
DE102015217778B4 (de) | 2015-09-17 | 2019-05-29 | Robert Bosch Gmbh | Akustischer Sensor mit einer Membran und einem elektroakustischen Wandler |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3721209A1 (de) * | 1987-06-26 | 1989-01-05 | Vega Grieshaber Gmbh & Co | Schall-/ultraschallmessgeraet |
DE19507650A1 (de) * | 1995-03-06 | 1996-09-12 | Gregor Verpoorten | Ultraschallsensor mit segmentierter Membrane |
DE19614885C1 (de) * | 1996-04-16 | 1997-09-04 | Bosch Gmbh Robert | Sensor zum Senden und/oder Empfangen akustischer Signale |
US5834877A (en) * | 1995-08-28 | 1998-11-10 | Accuweb, Inc. | Ultrasonic transducer units for web detection and the like |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3732410A1 (de) * | 1987-09-25 | 1989-04-13 | Siemens Ag | Ultraschallwandler mit astigmatischer sende-/empfangscharakteristik |
-
2001
- 2001-08-08 DE DE2001138892 patent/DE10138892A1/de not_active Withdrawn
-
2002
- 2002-06-21 EP EP02013779.0A patent/EP1283516B1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3721209A1 (de) * | 1987-06-26 | 1989-01-05 | Vega Grieshaber Gmbh & Co | Schall-/ultraschallmessgeraet |
DE19507650A1 (de) * | 1995-03-06 | 1996-09-12 | Gregor Verpoorten | Ultraschallsensor mit segmentierter Membrane |
US5834877A (en) * | 1995-08-28 | 1998-11-10 | Accuweb, Inc. | Ultrasonic transducer units for web detection and the like |
DE19614885C1 (de) * | 1996-04-16 | 1997-09-04 | Bosch Gmbh Robert | Sensor zum Senden und/oder Empfangen akustischer Signale |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005064589A1 (de) * | 2003-12-19 | 2005-07-14 | Valeo Schalter Und Sensoren Gmbh | Ultraschallwandlervorrichtung |
WO2007113503A2 (en) * | 2006-03-31 | 2007-10-11 | University Of Strathclyde | Ultrasonic transducer/receiver |
WO2007113503A3 (en) * | 2006-03-31 | 2008-02-28 | Univ Strathclyde | Ultrasonic transducer/receiver |
US7982366B2 (en) | 2008-12-16 | 2011-07-19 | Tung Thih Electronic Co., Ltd. | Ultrasound transducer with a dumbbell-shaped chamber |
EP2221802A1 (de) * | 2009-02-19 | 2010-08-25 | Tung Thih Electronic Co., Ltd. | Ultraschallwandler mit hantelförmiger Kammer |
Also Published As
Publication number | Publication date |
---|---|
DE10138892A1 (de) | 2003-02-20 |
EP1283516A3 (de) | 2008-07-30 |
EP1283516B1 (de) | 2016-07-06 |
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