EP1764778A2 - Procédé de fabrication d'un capteur ultrasonique et capteur ultrasonique - Google Patents

Procédé de fabrication d'un capteur ultrasonique et capteur ultrasonique Download PDF

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Publication number
EP1764778A2
EP1764778A2 EP06014432A EP06014432A EP1764778A2 EP 1764778 A2 EP1764778 A2 EP 1764778A2 EP 06014432 A EP06014432 A EP 06014432A EP 06014432 A EP06014432 A EP 06014432A EP 1764778 A2 EP1764778 A2 EP 1764778A2
Authority
EP
European Patent Office
Prior art keywords
membrane
metallic coating
ultrasonic sensor
housing
decoupling
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Withdrawn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
EP06014432A
Other languages
German (de)
English (en)
Other versions
EP1764778A3 (fr
Inventor
Wilhelm Korthals
Stefan-Robert Müller
Jürgen HÖNLE
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.)
Valeo Schalter und Sensoren GmbH
Original Assignee
Valeo Schalter und Sensoren 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 Valeo Schalter und Sensoren GmbH filed Critical Valeo Schalter und Sensoren GmbH
Publication of EP1764778A2 publication Critical patent/EP1764778A2/fr
Publication of EP1764778A3 publication Critical patent/EP1764778A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device

Definitions

  • the invention relates to a method for producing an ultrasonic sensor, comprising a membrane and a decoupling element to be arranged on the membrane.
  • ultrasonic sensors are used, for example, in proximity detection systems of motor vehicles.
  • An initially mentioned ultrasonic sensor is for example from the DE 101 25 272 A1 known.
  • the one mentioned there Decoupling medium is used to decouple the membrane of surrounding components vibrationally.
  • decoupling of the membrane from a housing of the ultrasound sensor can take place and / or from a bumper in which the ultrasound sensor is arranged.
  • ultrasonic sensors in close-range detection systems of motor vehicles has many technical advantages. However, it is desirable for optical reasons that the ultrasonic sensors fit as inconspicuously as possible in the overall appearance of a motor vehicle.
  • the present invention has the object to provide a method for producing an ultrasonic sensor, which makes it possible to integrate an ultrasonic sensor as inconspicuous as possible in its installation environment.
  • This object is achieved in that in the assembled state of membrane and decoupling medium whose surfaces are at least partially provided with a metallic coating.
  • this has the advantage that not only the membrane itself but also the surfaces of the decoupling element visible to a viewer are optically adapted to the installation environment of the ultrasound sensor.
  • a surface portion of the decoupling medium that is color-contrasting from the membrane does not remain.
  • the number of manufacturing steps can be reduced if the order of the metallic coating in the assembled state of membrane and decoupling medium takes place.
  • the application of the metallic coating takes place when the membrane and the decoupling element are mounted in a housing of the ultrasound sensor, so that the decoupling element is arranged between the housing and the membrane.
  • This makes it possible to initially mount an ultrasonic sensor in order to then either supply it to an application in which a metallic coating is not desired or not required or to then provide it with a metallic coating.
  • surface portions of the housing can be at least partially provided with this metallic coating. This ensures on the one hand that even with larger gaps between the ultrasonic sensor and the installation environment of the ultrasonic sensor all visible surface portions are uniformly provided with the metallic coating.
  • a particularly advantageous embodiment of the invention provides that the metallic coating is applied by means of the PVD method.
  • PVD stands for Physical Vapor Deposition.
  • coating material in solid form is introduced into a vacuum coating chamber.
  • the coating material is locally evaporated so that this evaporated material can settle on a substrate to be coated.
  • an ultrasonic sensor can be produced which has an optically perfect metallic coating.
  • the PVD method has the advantage over the previously used for the chrome plating of the membrane galvanic process that even an already fully assembled ultrasonic sensor can be coated, since the PVD process is a "dry" process, which allows the use of to dispense with galvanic baths.
  • the PVD process is environmentally friendly due to the already mentioned waiver of galvanic baths.
  • the use of the sputtering method has proved to be particularly advantageous.
  • the evaporation of the coating material takes place in the vacuum chamber in that the coating material is bombarded with ions.
  • noble gas ions for example argon ions, are advantageously used for this purpose.
  • atoms disposed in the surface layers of the coating material may be dissolved out so that they can settle on the membrane and the decoupling medium.
  • a first paint layer is applied to surface portions of the membrane and / or the decoupling medium and / or the housing prior to application of the metallic coating.
  • a first lacquer layer With such a first lacquer layer, a surface can be created on which the subsequently applied metallic coating is good liable.
  • a suitable composition of the material of the first lacquer layer By means of a suitable composition of the material of the first lacquer layer, a high-gloss effect can also be achieved.
  • the lacquer layer is so thick that unevenness in the surface portions of the membrane and / or the decoupling medium and / or the housing can be compensated.
  • a planar carrier surface can be provided for the subsequent application of the metallic coating.
  • a development of the invention provides that an outer lacquer layer is applied to the metallic coating.
  • the metallic coating can be protected, in particular with regard to corrosion and wear.
  • the corrosion protection is particularly important with regard to aggressive media such as road salt of importance.
  • a wear protection is desirable especially in a front-side installation of an ultrasonic sensor in a motor vehicle in order to avoid damage by stone chipping.
  • the outer lacquer layer may at least partially contain clear lacquer, by means of which a high-gloss surface is simultaneously produced and the metallic coating is protected against mechanical influences.
  • the invention also relates to an ultrasonic sensor.
  • an ultrasonic sensor is designated overall by the reference numeral 2.
  • This has a housing 4, which has a lateral electrical connection region 6 and a cup-shaped receiving region 8.
  • a circular membrane 10 is arranged in the receiving area 8 .
  • the decoupling element 12 is made of an elastic material.
  • the decoupling element 12 has, adjacent to the membrane 10, an end-side annular body 14, to which an approximately cylindrical wall 16 connects in the direction of the receiving area 8. At this wall 16 in turn is followed by a base portion 18 which is received in the receiving area 8 of the housing 4.
  • the components described form surfaces that are visible to a viewer in the installation situation of the ultrasonic sensor 2.
  • This is, for example, a circular surface 20 of the membrane 10.
  • This is also an annular surface 22 which is associated with the front-side annular body 14 of the decoupling element 12. With a generous gap between the ultrasonic sensor and the installation environment, a part of the cylindrical wall 16 or its associated surface 24 is also visible.
  • the base region 18 of the decoupling element 12 has a surface 26 which is arranged parallel to the circular surface 20 of the membrane 10.
  • the housing 4 has a total of 28 designated surface portions. The surface portions 28 are limited at the level of the connection region 6 by uneven boundaries 30 and 32.
  • the surfaces 20, 22, 24, 26 and 28 have a layer structure which is shown in FIG.
  • the membrane 10 is exemplified as a carrier.
  • the layer structure of the decoupling element 12 or of sections of the housing 4 is identical.
  • a first lacquer layer 34 is applied to the membrane. This serves to compensate for unevenness of the carrier material, that is, for example, the membrane 10, the decoupling element 12 or the housing 4.
  • a metallic coating 36 is applied. This is applied advantageously by means of the sputtering method.
  • an outer lacquer layer 38 which contains clearcoat constituents and protects the metallic coating 36 against corrosive and mechanical influences, is arranged on the metallic coating 36.
  • This order can be subject to generous tolerances. It can thus be seen that the metallic coating 36 is unevenly delimited in the region of the connection region 6 of the housing 4 (see limitations 30 and 32). However, since this area remains invisible to a viewer in the installation situation of the ultrasonic sensor 2, it is not necessary to provide this area with the layer structure according to FIG. 2 throughout.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
EP06014432A 2005-09-16 2006-07-12 Procédé de fabrication d'un capteur ultrasonique et capteur ultrasonique Withdrawn EP1764778A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510045306 DE102005045306A1 (de) 2005-09-16 2005-09-16 Verfahren zur Herstellung eines Ultraschallsensors sowie Ultraschallsensor

Publications (2)

Publication Number Publication Date
EP1764778A2 true EP1764778A2 (fr) 2007-03-21
EP1764778A3 EP1764778A3 (fr) 2007-11-28

Family

ID=37510712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06014432A Withdrawn EP1764778A3 (fr) 2005-09-16 2006-07-12 Procédé de fabrication d'un capteur ultrasonique et capteur ultrasonique

Country Status (2)

Country Link
EP (1) EP1764778A3 (fr)
DE (1) DE102005045306A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013214294B4 (de) * 2013-07-22 2021-06-24 Robert Bosch Gmbh Ultraschallsensor
DE102013022047A1 (de) 2013-12-23 2015-06-25 Valeo Schalter Und Sensoren Gmbh Ultraschallsensor
DE102017202425A1 (de) 2017-02-15 2018-08-16 Robert Bosch Gmbh Membrantropf für einen Ultraschallwandler, Verfahren zum Herstellen eines Membrantopfs und Ultraschallwandler

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001061375A1 (fr) * 2000-02-17 2001-08-23 Volkswagen Aktiengesellschaft Detecteur a ultrasons
DE10023065A1 (de) * 2000-02-12 2001-08-30 Volkswagen Ag Ultraschallsensor für ein Kraftfahrzeug
EP1431957A2 (fr) * 2002-12-19 2004-06-23 Valeo Schalter und Sensoren GmbH Capteur d'ultrasons et méthode de fabrication
WO2005024451A2 (fr) * 2003-08-11 2005-03-17 Valeo Schalter Und Sensoren Gmbh Capteur destine a un systeme de detection de proximite ou d'aide au stationnement d'un vehicule et son procede de production

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19601656B4 (de) * 1996-01-18 2009-07-16 Valeo Schalter Und Sensoren Gmbh Bedämpfter Ultraschallwandler
DE19714606A1 (de) * 1997-04-09 1998-10-15 Itt Mfg Enterprises Inc Ultraschallsensormodul mit Folienwandler
DE10125272A1 (de) * 2001-05-23 2002-11-28 Valeo Schalter & Sensoren Gmbh Verfahren zur Herstellung eines Ultraschallsensors sowie Ultraschallsensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10023065A1 (de) * 2000-02-12 2001-08-30 Volkswagen Ag Ultraschallsensor für ein Kraftfahrzeug
WO2001061375A1 (fr) * 2000-02-17 2001-08-23 Volkswagen Aktiengesellschaft Detecteur a ultrasons
EP1431957A2 (fr) * 2002-12-19 2004-06-23 Valeo Schalter und Sensoren GmbH Capteur d'ultrasons et méthode de fabrication
WO2005024451A2 (fr) * 2003-08-11 2005-03-17 Valeo Schalter Und Sensoren Gmbh Capteur destine a un systeme de detection de proximite ou d'aide au stationnement d'un vehicule et son procede de production

Also Published As

Publication number Publication date
EP1764778A3 (fr) 2007-11-28
DE102005045306A1 (de) 2007-03-29

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