DE102007041850A1 - Ultrasonic sensor with a carrier element and a membrane, wherein the membrane is embedded in the carrier element - Google Patents

Ultrasonic sensor with a carrier element and a membrane, wherein the membrane is embedded in the carrier element

Info

Publication number
DE102007041850A1
DE102007041850A1 DE200710041850 DE102007041850A DE102007041850A1 DE 102007041850 A1 DE102007041850 A1 DE 102007041850A1 DE 200710041850 DE200710041850 DE 200710041850 DE 102007041850 A DE102007041850 A DE 102007041850A DE 102007041850 A1 DE102007041850 A1 DE 102007041850A1
Authority
DE
Germany
Prior art keywords
membrane
carrier element
ultrasonic sensor
according
element
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.)
Withdrawn
Application number
DE200710041850
Other languages
German (de)
Inventor
Peter Knoll
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE200710041850 priority Critical patent/DE102007041850A1/en
Publication of DE102007041850A1 publication Critical patent/DE102007041850A1/en
Withdrawn legal-status Critical Current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 hooter, buzzer
    • G10K9/18Details, e.g. bulbs, pumps, pistons, switch, casing
    • G10K9/20Sounding members

Abstract

The invention relates to an ultrasonic sensor having a carrier element with a membrane and having an actuator connected to the membrane, wherein between the carrier element and the membrane, a dilution region for enabling the vibration of the membrane is present, wherein the membrane is embedded in the carrier element. The invention also relates to a method for measuring distances and / or determining the shape and nature of objects spaced from a sensor with an ultrasonic sensor.

Description

  • The The invention relates to an ultrasonic sensor with a carrier element, with a membrane and with an actuator connected to the membrane wherein, in the support member and the membrane, a dilution region to allow the membrane to swing.
  • State of the art
  • Out In the prior art ultrasonic sensors are known: ultrasonic sensors are used in vehicles to determine the distance to objects.
  • An ultrasonic sensor is about from the US 6 639 339 B1 known. In this case, a membrane is mounted on a porous layer structure and occupied by metallic electrodes. There is a gap between the membrane and the porous layer structure. The membrane rests on the porous layer structure and is connected to it in a conventional manner. The porous layer structure is in turn connected to a carrier structure. In a specific embodiment, a spacing element is present between the membrane and the porous layer structure.
  • Out known in the art ultrasonic sensors, which also as Ultrasonic vibrators are called, have the disadvantage that they only work narrowband, d. H. only in a certain, have a narrow frequency range emitting. Due to appropriate Although it is possible to excite integer multiples of the excitation Using natural frequency when using piezo-ultrasonic sensors, however, it is not possible to have a wide frequency range to use. Piezo ultrasonic sensors have a membrane, on which a piezo element is applied. The piezo elements are usually glued on. A piezo element has the advantage on that it is very fast due to electrical stimulation Movement can result, however, is such a Piezo element very brittle. In case of heavy pressure, especially with strong sudden pressure, like a shock, break these brittle piezo elements frequently, which leads to a total failure of such an ultrasonic sensor.
  • Disclosure of the invention
  • Advantages of the invention
  • There existing ultrasonic sensors usually in a bumper a motor vehicle can be housed in a strong Shock a piezoelectric ultrasonic sensor will be destroyed.
  • One According to the invention, the ultrasonic sensor can detect allow objects to shape and texture, so that in parking systems a more complex environment can be modeled. This allows entry and Ausparkvorgänge for motor vehicles be controlled much better.
  • This is solved generically by the fact that the membrane is embedded in the carrier element. Thereby, that the membrane is embedded in the support element results a larger usable for the actuator Area behind the carrier element. When attaching the support element on a motor vehicle, in particular during execution of the Carrier element as a bumper, leaves attach the actuator on the side facing the motor vehicle, so that it is protected from shocks.
  • advantageous Embodiments are defined in the subclaims claimed and explained in more detail below.
  • So It is advantageous if the actuator is a coil with ferromagnetic Core, wherein the core is so associated with the membrane, that movement of the core causes movement of the membrane. An embodiment of the actuator as a coil with ferromagnetic Although core requires more space than a piezo element, but is much more robust. Furthermore, can be independently from the natural frequency of the actuator different frequencies of the Ultrasonic sensors emit. By an appropriate design it is not necessary to resort to a resonant oscillator the only whole-line multiple of a natural frequency in the ultrasonic sensor can cause.
  • Around transfer the movement of the actuator to the membrane with low loss it is advantageous if the core is connected to the membrane, preferably over a metal plate. The use of a metal plate allows the use of cost-effective Building materials, which are particularly durable.
  • If the dilution range through into the carrier element introduced grooves is so it can be Adjust the swing of the diaphragm to the desired degree. The preparation of the dilution range can not only particularly cost-effective, but also with the help known and numerous existing tools done.
  • If the grooves are made on the top and bottom of the support element, preferably semicircular or circular to realize a circularly symmetrical emission, so can be in a symmetrical manner, the thickness of the Ver simply set the dilution range to a predetermined value.
  • One another advantageous embodiment is then achieved if the grooves on the top and bottom of the support element are executed, preferably circular to Realization of a circularly symmetrical emission characteristic.
  • The Manufacturing times can be significantly reduced if the membrane and the carrier element consist of an integral component.
  • It is also advantageous if between the membrane and the support element ring around the membrane at least the membrane from the support element decoupling decoupling elements are present, which is a transfer of structure-borne noise from the membrane to the carrier element and vice versa. An unwanted vibration of the support element is thereby prevented.
  • The Decoupling elements can then be particularly cost-effective If they are made of rubber and preferably rubber buffer are.
  • If the carrier element is preferably made of plastic Bumper of a motor vehicle is so leaves refrain from additional elements, what the production times reduced and the ease of maintenance increased.
  • Appropriate Advantages are also provided by a method for measuring distances and / or determining the shape and nature of a sensor reaches spaced objects with an ultrasonic sensor, the a carrier element, a membrane and an actuator, which is connected to the membrane, wherein between the carrier element and permitting the membrane to dilute the swinging of the membrane is present, wherein the membrane in the Carrier element is embedded. This can be done a more robust, more durable ultrasonic sensor in one process use that provides more accurate results.
  • Short description of the drawing
  • The The invention will be explained in more detail with the aid of a drawing. Showing:
  • 1 a schematic view of an ultrasonic sensor is the part of a bumper for a motor vehicle.
  • embodiments the invention
  • 1 shows an ultrasonic sensor 1 with a carrier element 2 and a membrane 3 , The carrier element 2 is designed as a bumper of a motor vehicle. The membrane 3 is on all sides of a dilution range 4 surround. The dilution range 4 has semicircular or circular depressions 5 on, which are also referred to as grooves.
  • The wells 5 are on the top and bottom or only on one of the two sides of the support element 2 introduced into this. Between the wells 5 are webs 6 available. On the far side of the dilution area 4 is in the carrier element 2 a damping element available. The damping element is as a decoupling element 7 listed. The decoupling element 7 is, for example, hollow cylindrical in such a way that inside the hollow cylinder of the dilution 4 and the membrane 3 is located. However, it is also possible that two decoupling elements 7 a region of the carrier element 2 so completely from the rest of the carrier element 2 disconnect that within these decoupling elements 7 the two dilution areas 4 and the membrane 3 are located. It is also possible that the dilution ranges 4 are formed separately from each other, so that the membrane 3 from one end of the support element 2 extends to the other, ie in the cutting plane from the front or rear.
  • When mounting the carrier element 2 on a motor vehicle, it is desirable that the membrane 3 pointing to the outside and an actor 8th between the carrier element 2 and the chassis of the motor vehicle is mounted. The actor 8th includes a coil 9 and a ferromagnetic core 10 , The ferromagnetic core 10 is relative to the coil 9 movable. In the illustrated embodiment, the core 10 movable along the arrow A, such that the core 10 in the coil 9 penetrates, and also out of it is designed to be moved out, depending on the application of electrical energy. The ferromagnetic core 10 is with a metal plate 11 connected. Also plates of other material, such as rigid plastic, are usable. Over the metal plate 11 the kinetic energy is transferred to the membrane 3 passed.
  • In the present embodiment, a plastic part is inserted into the outer skin of a bumper. The plastic part is in the present case as a carrier element 2 formed.
  • While in the embodiment according to 1 on both sides of the carrier element 2 a dilution range 4 is formed, so it is also possible, this dilution range 4 only on one side of the support element, ie to install left and right of the membrane on the underside of the support element or on the top of the support element. This makes it possible for the structure of the dilution range 4 is not visible to a viewer looking from the outside on the bumper.
  • The membrane 3 in 1 is movable in the direction of arrow A up and down. This makes it possible to send several tones simultaneously with this structure and also to modulate them in their frequency. It is thus created an ultrasonic sensor, with which the sound emission of a bat can be partially reproduced. In addition, this ultrasonic sensor has some robust mechanical properties and is much better protected against the risk of damage by stone impact than is the case with conventional ultrasonic sensors with a membrane and glued piezo element. It is possible to use a high sound pressure of about 120 dB and at the same time send out three harmonics. Ie. So signals over z. B. three octaves.
  • Furthermore, it is possible to modulate the emitted signals in the sense of chirp signals by first ejecting a CF-FM signal which is subsequently modulated in its frequency. CF-FM signal is understood as meaning constant frequency-frequency modulated signals. By such an ultrasonic transducer, a broadband excitation is possible, which makes it possible to classify complex systems in terms of shape and texture, in particular by density. As background to chirp signals is on the pamphlet DE 42 32 254 A1 directed.
  • about The frequency deviation can also be based on the shape of the detected Object close, being about the different Frequencies find out the nature of the object in the way leaves.
  • About electrical suggestions of the actuator 8th in particular by the movement of the core 10 in the coil 9 , lets a movement of the membrane 3 resulting in the emission of sound signals, in particular of ultrasound signals leads. Their echo can be collected via suitable sensors and determined by determining the duration of the distance to the object.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • - US 6639339 B1 [0003]
    • - DE 4232254 A1 [0027]

Claims (11)

  1. Ultrasonic sensor ( 1 ) with a carrier element ( 2 ), with a membrane ( 3 ) and with an actuator ( 8th ) connected to the membrane ( 3 ), wherein between the carrier element ( 2 ) and the membrane ( 3 ) a dilution range ( 4 ) for allowing the membrane to vibrate ( 3 ), characterized in that the membrane ( 3 ) in the carrier element ( 2 ) is embedded.
  2. Ultrasonic sensor ( 1 ) according to claim 1, wherein the actuator ( 8th ) a coil ( 9 ) with ferromagnetic core ( 10 ), where the core ( 10 ) in such a way with the membrane ( 3 ), that movement of the nucleus ( 10 ) a movement of the membrane ( 3 ).
  3. Ultrasonic sensor ( 1 ) according to claim 2, wherein the core ( 10 ) with the membrane ( 3 ), preferably via a metal plate ( 11 ).
  4. Ultrasonic sensor ( 1 ) according to claim 1, 2 or 3, wherein the dilution range ( 4 ) through into the carrier element ( 2 ) introduced grooves.
  5. Ultrasonic sensor ( 1 ) according to claim 4, wherein the grooves on the top and bottom of the support element ( 2 ) are executed, preferably semicircular for the realization of a selective emission characteristic with a narrowed in the vertical emission range to avoid ground echoes.
  6. Ultrasonic sensor ( 1 ) according to claim 4, wherein the grooves on the top and bottom of the support element ( 2 ) are executed, preferably circular for the realization of a circularly symmetrical emission characteristic.
  7. Ultrasonic sensor ( 1 ) according to any one of claims 1 to 6, wherein the membrane ( 3 ) and the carrier element ( 2 ) consist of an integral component.
  8. Ultrasonic sensor ( 1 ) according to any one of claims 1 to 7, wherein between the membrane ( 3 ) and the carrier element ( 2 ) on both sides of the membrane ( 3 ) the membrane ( 3 ) of the carrier element ( 2 ) decoupling decoupling elements ( 7 ), which transmit a structure-borne noise from the membrane ( 3 ) on the carrier element ( 2 ) and vice versa.
  9. Ultrasonic sensor ( 1 ) according to claim 8, wherein the decoupling elements ( 7 ) are made of rubber and are preferably rubber buffers.
  10. Ultrasonic sensor ( 1 ) according to one of claims 1 to 9, insofar as the carrier element ( 2 ) is a preferably made of plastic bumper of a motor vehicle.
  11. Method for measuring distances and / or determining of the shape and nature of objects spaced from a sensor with an ultrasonic sensor according to one of claims 1 to 10th
DE200710041850 2007-09-03 2007-09-03 Ultrasonic sensor with a carrier element and a membrane, wherein the membrane is embedded in the carrier element Withdrawn DE102007041850A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200710041850 DE102007041850A1 (en) 2007-09-03 2007-09-03 Ultrasonic sensor with a carrier element and a membrane, wherein the membrane is embedded in the carrier element

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE200710041850 DE102007041850A1 (en) 2007-09-03 2007-09-03 Ultrasonic sensor with a carrier element and a membrane, wherein the membrane is embedded in the carrier element
DE200850001428 DE502008001428D1 (en) 2007-09-03 2008-07-21 Ultrasonic sensor with a carrier element and a membrane, wherein the membrane is embedded in the carrier element
EP20080104810 EP2031580B1 (en) 2007-09-03 2008-07-21 Ultrasound sensor with a holding element and a membrane, wherein the membrane is embedded into the holding element
CN200810214862.9A CN101384101B (en) 2007-09-03 2008-09-03 Ultrasound sensor and a method using the sensor

Publications (1)

Publication Number Publication Date
DE102007041850A1 true DE102007041850A1 (en) 2009-03-05

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DE200710041850 Withdrawn DE102007041850A1 (en) 2007-09-03 2007-09-03 Ultrasonic sensor with a carrier element and a membrane, wherein the membrane is embedded in the carrier element
DE200850001428 Active DE502008001428D1 (en) 2007-09-03 2008-07-21 Ultrasonic sensor with a carrier element and a membrane, wherein the membrane is embedded in the carrier element

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE200850001428 Active DE502008001428D1 (en) 2007-09-03 2008-07-21 Ultrasonic sensor with a carrier element and a membrane, wherein the membrane is embedded in the carrier element

Country Status (3)

Country Link
EP (1) EP2031580B1 (en)
CN (1) CN101384101B (en)
DE (2) DE102007041850A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8806930B2 (en) * 2009-08-31 2014-08-19 Michelin Recherche Et Technique S.A. Method and apparatus for determining the depth of a metal feature in a rubber or elastomeric material
DE102010049820A1 (en) 2010-10-27 2012-05-03 Valeo Schalter Und Sensoren Gmbh Arrangement such as bumper and/or decorative trim mounted in motor vehicle, has a cover which is connected to outer lining element and partially formed of injection molding material
DE102010049818A1 (en) 2010-10-27 2012-05-03 Valeo Schalter Und Sensoren Gmbh Arrangement with an outer lining element and a holding device, vehicle with an arrangement and method for producing an arrangement
DE102012208059A1 (en) * 2012-05-14 2013-11-14 Robert Bosch Gmbh Sensor assembly for measuring distance in vehicle, has membrane, which is positively integrated as separate component or in form of fiber mat in support element, and damping material is applied on vibratable portion of membrane
EP2829841A1 (en) * 2013-07-22 2015-01-28 Voestalpine Stahl GmbH Device and method for contactless positioning a sensor and/or actuator device
DE102018105268B3 (en) 2018-03-07 2019-04-25 Valeo Schalter Und Sensoren Gmbh Device for ultrasonic conversion

Citations (2)

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Publication number Priority date Publication date Assignee Title
DE4232254A1 (en) 1992-07-21 1994-04-07 Siemens Ag Ultrasonic testing method for locating material defects - driving ultrasonic transducer with FM chirp signal with instantaneous frequency variation matched to transmission path transfer function
US6639339B1 (en) 2000-05-11 2003-10-28 The Charles Stark Draper Laboratory, Inc. Capacitive ultrasound transducer

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US5728089A (en) * 1993-06-04 1998-03-17 The Regents Of The University Of California Microfabricated structure to be used in surgery
JP3501860B2 (en) * 1994-12-21 2004-03-02 日本碍子株式会社 Piezoelectric / electrostrictive film type element and manufacturing method thereof
GB9704486D0 (en) * 1997-03-04 1997-04-23 New Transducers Ltd Acoustic devices etc
US6028389A (en) * 1998-05-26 2000-02-22 The Charles Stark Draper Laboratory, Inc. Micromachined piezoelectric transducer
DE10360800B4 (en) * 2003-12-23 2006-03-23 Bayerische Motoren Werke Ag Distance sensor for use with parking aids in motor vehicles
WO2006130731A2 (en) * 2005-05-31 2006-12-07 Unison Products Optimized piezo design for a mechanical-to-acoustical transducer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232254A1 (en) 1992-07-21 1994-04-07 Siemens Ag Ultrasonic testing method for locating material defects - driving ultrasonic transducer with FM chirp signal with instantaneous frequency variation matched to transmission path transfer function
US6639339B1 (en) 2000-05-11 2003-10-28 The Charles Stark Draper Laboratory, Inc. Capacitive ultrasound transducer

Also Published As

Publication number Publication date
CN101384101B (en) 2014-04-30
DE502008001428D1 (en) 2010-11-11
CN101384101A (en) 2009-03-11
EP2031580B1 (en) 2010-09-29
EP2031580A1 (en) 2009-03-04

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R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20140401