EP2229242A1 - Ultraschallwandler zur erzeugung asymmetrischer schallfelder - Google Patents
Ultraschallwandler zur erzeugung asymmetrischer schallfelderInfo
- Publication number
- EP2229242A1 EP2229242A1 EP08869632A EP08869632A EP2229242A1 EP 2229242 A1 EP2229242 A1 EP 2229242A1 EP 08869632 A EP08869632 A EP 08869632A EP 08869632 A EP08869632 A EP 08869632A EP 2229242 A1 EP2229242 A1 EP 2229242A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- transducer element
- ultrasonic transducer
- ultrasonic
- transducer
- 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
- 239000000463 material Substances 0.000 claims abstract description 10
- 230000010355 oscillation Effects 0.000 claims abstract description 4
- 239000012528 membrane Substances 0.000 claims description 57
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000005855 radiation Effects 0.000 description 11
- 238000010276 construction Methods 0.000 description 4
- 238000002604 ultrasonography Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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 present invention relates to an ultrasonic transducer for generating asymmetric sound fields, in particular for applications in gaseous media, comprising a housing having an elongate membrane and a plate-shaped transducer element of an electrostrictive material, through which the membrane can be excited to oscillate in the ultrasonic range.
- Ultrasonic transducers which generate asymmetrical sound fields are used, inter alia, in the field of spatial surveillance, for example as parking sensors in motor vehicles.
- Ultrasonic transducers for use in gaseous media, in particular in air, generally generate sound in the range between 20 and 400 kHz.
- conventional ultrasound transducers have a circular diaphragm which, by means of a transducer element made of an electrostrictive material, is attached thereto
- Ultrasonic transducers with a circular diaphragm or aperture generally generate symmetrical sound fields. However, for many applications, particularly where the ultrasonic transducers are located near a ceiling, floor or wall, asymmetric sound fields are desired which have a greater extent along the axis perpendicular to the main propagation direction than along the perpendicular axis. This relates, for example, to ultrasound transducers which are used in parking aid systems of motor vehicles and are intended to have a broader sound radiation in the horizontal with respect to the vertical.
- An asymmetrical sound radiation can be achieved by a correspondingly asymmetrical design of the membrane of the ultrasonic transducer.
- Under the membrane here is the thinned region of the transducer to understand, which is excited by the transducer element to ultrasonic vibrations.
- the shape of the membrane thus also corresponds to the shape of the aperture of the ultrasonic transducer.
- a membrane may be a separate component which is held in a housing or also formed by a thin portion of an otherwise solid component.
- an ultrasonic transducer for generating an asymmetric sound field which comprises a housing with an elongated membrane and a arranged on one side of a main surface of the membrane plate-shaped transducer element of an electro has strict material through which the membrane is excitable to vibrations in the ultrasonic range.
- the membrane formed integrally with the housing in this case has an elongated shape which is obtained by corresponding cutouts or holes in the material block forming the housing.
- the plate-shaped transducer element is glued centrally on the inner surface of the membrane.
- DE 19512417 C2 describes a piezoelectric ultrasonic transducer for transit time measurements, which can also be used for space monitoring.
- the ultrasonic transducer has a plurality of mutually equally spaced, piezoelectric lamellae, which is connected at their respective narrow sides with a continuous one-piece cover plate. Due to the elongated cover plate a correspondingly asymmetric sound radiation is achieved.
- the construction of this converter is complex.
- the object of the present invention is to provide a simply constructed ultrasonic transducer for generating asymmetric sound fields, which can be used in gaseous media and allows a large ratio of the opening angle of the sound radiation.
- the proposed ultrasonic transducer has, in a known manner, a housing with an elongated membrane and a plate-shaped transducer element made of an electrostrictive material, arranged on one side of a main surface of the membrane, through which the membrane oscillates in the
- Ultrasonic range is excitable.
- electrodes are attached to the transducer element in a known manner, via which the transducer element can be excited to oscillate or can be detected via the electrical voltage changes on the transducer element which are caused by the reception of ultrasonic waves.
- the transducer element here preferably consists of a piezoelectric material, for example a piezoelectric ceramic.
- the proposed ultrasonic transducer is characterized in that a gap is formed between the diaphragm and the transducer element and the diaphragm is mechanically coupled to the transducer element only via its edge.
- the mechanical coupling can in this case be realized via a stepped intermediate element between the transducer element and the membrane.
- the proposed ultrasonic transducer has only on one side of the transducer element a membrane in order to achieve the desired sound radiation. Due to the elongated shape of the membrane this forms an elongated aperture for the sound radiation of the
- Ultrasonic transducer so that the ultrasonic transducer generates a correspondingly asymmetric sound field.
- the membrane is driven by the plate-shaped transducer element, which transmits the vibration only at the edge and is not fully connected to the membrane, as is the case in the prior art in this field.
- This embodiment also achieves a lever effect which amplifies the deflection of the membrane and thus enables increased oscillation amplitudes and an increased range of the ultrasonic radiation.
- By coupling the membrane only over its edge with the transducer element can be with appropriate asymmetry of the membrane, i. a corresponding unequal ratio of length to the width of the membrane, readily generate vibration modes that allow a ratio of the opening angle of the sound radiation of 1: 3 or above.
- the membrane has a rectangular basic shape.
- the corners of this rectangular basic shape can also be rounded due to the production.
- Such an ultrasonic transducer can be produced inexpensively and allows a larger ratio of the opening angles of the sound radiation in two mutually perpendicular planes than is possible with the previously known ultrasonic transducers for the present applications.
- the transducer element is not operated in the thickness mode, but in a lateral vibration mode, for example.
- the 3-1 mode It is only essential for the design of the membrane that a geometric axis is substantially longer than the other axis, whereby the elongated shape and thus the asymmetrical sound radiation is achieved.
- the membrane is mechanically coupled to the transducer element over a region of the housing.
- the transducer element is preferably inserted into a peripheral recess in a wall region of the housing.
- the recess is arranged, for example, on the rear side opposite the membrane of the housing, that a gap between the membrane and the transducer element is present.
- the membrane may in this case be formed integrally with the housing in a known manner.
- an ultrasonic transducer With such an ultrasonic transducer, a three-dimensional space can be illuminated with ultrasound to detect obstacles or objects.
- the ultrasonic transducer allows a range of several meters and can be due to the asymmetric sound field in the vicinity of reflective surfaces, such as walls, floor or ceiling, use.
- the ultrasonic transducer consists of only a few components and can be inexpensively produce.
- Such an ultrasound transducer can be used, for example, for distance detection, access control or navigation assistance, for example in conjunction with a parking assistance system, although this is of course not an exhaustive list.
- Fig. 1 shows an example of the structure of
- Fig. 2 is a schematic representation of
- Fig. 3 is a plan view of the proposed ultrasonic transducer according to an embodiment in a schematic representation.
- the ultrasonic transducer shown schematically in section in FIG. 1 has a housing 1 in which a membrane 2 is formed by appropriate shaping.
- the housing 1 also has a Auf strictlyung for receiving a piezoceramic plate as a plate-shaped transducer element 3.
- the transducer element 3 can in this case be glued into this recess shown in the figure.
- Housing and membrane are integrally formed of the same material, in the present example of aluminum.
- the plate-shaped transducer element 3 can be formed, for example, from PZT 5H, a piezoceramic.
- the electrodes mounted on both sides of the plate-shaped transducer element 3 are not shown in the figures. The person skilled in the art is familiar with the arrangement of such electrodes on piezoelectric transducer elements.
- the ultrasonic transducer shown in Figure 1 for example, a graded total thickness of about 2mm, a recognizable in the figure width of about 10mm and a length of about 35mm exhibit.
- Transducer element 3 and the membrane 2 formed air gap is about 1.5 mm.
- the width of the membrane is about 8mm.
- the plate-shaped transducer element 3 is not connected directly to the membrane 2. Rather, the mechanical coupling of this transducer element 3 takes place with the membrane 2 only via the housing 1 with the edge of the membrane 2. This construction allows others
- Vibration modes as in full-surface bonding of the transducer element with the membrane so that by suitable elongated geometry of the membrane with a simple Effort significantly more asymmetrical sound fields (ie, with a larger ratio of the opening angle) can be generated, as with the construction according to the prior art described above.
- Figure 2 shows schematically the vibration transmission between the transducer element 3 and the membrane 2.
- a leverage is achieved by the coupling via the housing 1 and the edge of the membrane 2, which advantageously leads to a vibration amplification.
- the membrane 2 carries out larger oscillation amplitudes than the exciting transducer element 3.
- FIG. 3 shows a plan view of such an ultrasonic transducer in a schematic representation.
- the almost rectangular shape of the membrane 2 and the underlying transducer element 3 are indicated by dashed lines.
- the length of the membrane 2 can be scaled almost arbitrarily in order to generate correspondingly different asymmetries of the sound fields.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Surgical Instruments (AREA)
- Electrophonic Musical Instruments (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008003594 | 2008-01-09 | ||
PCT/DE2008/002140 WO2009086805A1 (de) | 2008-01-09 | 2008-12-19 | Ultraschallwandler zur erzeugung asymmetrischer schallfelder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2229242A1 true EP2229242A1 (de) | 2010-09-22 |
EP2229242B1 EP2229242B1 (de) | 2011-05-18 |
Family
ID=40622175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08869632A Not-in-force EP2229242B1 (de) | 2008-01-09 | 2008-12-19 | Ultraschallwandler zur erzeugung asymmetrischer schallfelder |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2229242B1 (de) |
AT (1) | ATE509708T1 (de) |
DE (1) | DE112008003772A5 (de) |
WO (1) | WO2009086805A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010053713A1 (de) * | 2010-12-07 | 2012-06-14 | Continental Automotive Gmbh | Elektroakustische Wandleranordnung und Verfahren zum Betreiben einer elektroakustischen Wandleranordnung |
DE102012201884A1 (de) * | 2012-02-09 | 2013-08-14 | Robert Bosch Gmbh | Schallwandler |
GB201409547D0 (en) * | 2014-05-29 | 2014-07-16 | Gill Instr Ltd | An electroacoustic transducer |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4330747C1 (de) * | 1993-09-10 | 1995-02-16 | Siemens Ag | Ultraschallwandler und Verfahren zu dessen Herstellung |
US6443901B1 (en) * | 2000-06-15 | 2002-09-03 | Koninklijke Philips Electronics N.V. | Capacitive micromachined ultrasonic transducers |
JP3915448B2 (ja) * | 2001-07-30 | 2007-05-16 | 日本ビクター株式会社 | 電気音響変換器 |
DE102006050037A1 (de) * | 2006-10-24 | 2008-04-30 | Robert Bosch Gmbh | Ultraschallwandler |
-
2008
- 2008-12-19 WO PCT/DE2008/002140 patent/WO2009086805A1/de active Application Filing
- 2008-12-19 AT AT08869632T patent/ATE509708T1/de active
- 2008-12-19 EP EP08869632A patent/EP2229242B1/de not_active Not-in-force
- 2008-12-19 DE DE112008003772T patent/DE112008003772A5/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2009086805A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE509708T1 (de) | 2011-06-15 |
EP2229242B1 (de) | 2011-05-18 |
DE112008003772A5 (de) | 2010-12-09 |
WO2009086805A1 (de) | 2009-07-16 |
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