WO2010130504A1 - Pot à membrane pour un transducteur à ultrasons et capteur ainsi équipé - Google Patents

Pot à membrane pour un transducteur à ultrasons et capteur ainsi équipé Download PDF

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Publication number
WO2010130504A1
WO2010130504A1 PCT/EP2010/054405 EP2010054405W WO2010130504A1 WO 2010130504 A1 WO2010130504 A1 WO 2010130504A1 EP 2010054405 W EP2010054405 W EP 2010054405W WO 2010130504 A1 WO2010130504 A1 WO 2010130504A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
lacquer layer
membrane
pot
layer
Prior art date
Application number
PCT/EP2010/054405
Other languages
German (de)
English (en)
Inventor
Detlev Schack
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
Publication of WO2010130504A1 publication Critical patent/WO2010130504A1/fr

Links

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
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/20—Sounding members
    • 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 a diaphragm pot for an ultrasonic transducer according to the preamble of the main claim.
  • Ultrasonic sensors for measuring the distance between a motor vehicle and
  • the sensors have a vibratable diaphragm, which is generally excited to resonate via a piezoelectric element.
  • a sound signal generated by the vibration is radiated from the diaphragm of the ultrasonic sensor, reflected by an obstacle, and detected by the same or an adjacent ultrasonic sensor. From the runtime, the distance to the obstacle can be determined.
  • the piezo element is arranged at the bottom of the diaphragm pot and connected to an evaluation electronics such that the entirety of the device forms the corresponding ultrasonic sensor.
  • the diaphragm cups are shaped so that they have a natural frequency in the ultrasonic range used. The resonance frequency is determined by the dimensions and the vibration characteristics of the diaphragm pot, in particular by the layer thickness of the diaphragm.
  • the ultrasonic sensors preferably have an aluminum housing and are usually mounted in the bumpers of the vehicle. So that the sensors are not distracting in the vehicle contour and are protected against environmental influences, it is necessary to provide the sensors with appropriate coatings. Depending on the material, these coatings can not be applied directly to the diaphragm cup. Many materials either do not adhere adequately or have a detrimental effect on sound propagation. The properties of such coatings change the resonance frequency of the diaphragm cup as a whole, so that it may be outside the desired frequency range or the membrane can not be excited in resonance.
  • DE 102004031310 discloses a diaphragm pot for an ultrasonic transducer with a diaphragm pot body and a metal coating galvanically applied thereon, in particular with a chromium layer for the visual appearance.
  • An inventive diaphragm pot with the features of the main claim has the advantage of a diaphragm pot body made of aluminum or aluminum alloy, to which a paint layer of a paint from the group comprising acrylate and paints containing epoxy or acrylate resins, is applied.
  • the lacquer layer is applied to at least one outer side of the diaphragm pot, preferably on the outside of the bottom.
  • the membrane pot body may optionally have received an anodizing treatment.
  • An advantage of the invention is that the paint is applied directly to the aluminum material of the diaphragm pot body without the need for a conversion coating.
  • the membrane cups according to the invention can withstand an increased alkali concentration due to the lacquer layer and are at the same time weather-resistant.
  • lacquer layer has a thickness in the range of 10 .mu.m to 45 .mu.m.
  • a lacquer layer of this thickness offers sufficient protection of the diaphragm pot and, on the other hand, does not adversely affect the sensor properties.
  • An advantage of the paint layer is its suitability for the design of the surface of the diaphragm pot as an optical visible surface.
  • the paint is colored, preferably in the vehicle color or a selected contrast color.
  • Another possibility is the application of a further lacquer layer.
  • Surfaces can be produced by depositing a metal layer in a vacuum, preferably with a thickness in the range 20 nm-5 ⁇ m, whereupon, if desired, a clearcoat layer can be applied.
  • FIG. 1 shows a cross section through a diaphragm pot according to the invention according to a first
  • FIG. 2 shows a cross section through a diaphragm pot according to the invention according to a further embodiment.
  • the membrane pot according to the invention can be used for any applications.
  • an application in a motor vehicle is advantageous because on the one hand a high corrosion resistance to weathering and z. As well as road salt must be given, while on the other hand also an acceptable appearance of the sensor is required.
  • the present invention will therefore be explained below on a diaphragm pot for use in an ultrasonic distance system for a motor vehicle.
  • FIG. 1 shows the cross-section of a membrane pot 1 with a membrane pot body 2 and a coating, wherein a hollow region 3 of the walls 4 of FIG
  • Diaphragm pot is included.
  • the diaphragm pot 1 is bounded on the bottom side by a membrane 5, to which the hollow region 3 facing inside for the transmission and reception of the ultrasonic signal, a piezoelectric element 6 is used, which is only indicated here, and that with a control and evaluation electronics, not shown connected is.
  • the membrane 5 opposite end of the hollow portion 3 of the diaphragm pot 1 is open, so that here leads and / or the control and evaluation electronics can be introduced into the hollow region 3.
  • the membrane 5 is designed substantially thinner than the walls 4, so that the sound generated by the piezoelectric element 6 is transmitted as weak as possible to the walls 4 of the diaphragm pot 1.
  • the walls 4 of the diaphragm cup 1 are provided with a circumferential groove 7, with which the diaphragm cup 1 can be inserted into a suitable holding unit.
  • the diaphragm pot body 2 is made of aluminum or an aluminum alloy. Adjacent to it, on the outside, is a lacquer layer 8 which comprises acrylate lacquer or lacquers containing epoxy or acrylate resins.
  • the lacquer layer 8 has a thickness in the range of 10 .mu.m to 45 .mu.m.
  • the diaphragm cup 1 forms a sensor for Close-range detection system of a vehicle. Another application of such a system is a parking assist system of the vehicle.
  • the diaphragm pot body 2 was manufactured from aluminum or aluminum alloy. Subsequently, the membrane pot body 2 was provided with the varnish layer 8 by means of an electrophoretic dip coating, in particular an anaphoretic dip coating, the varnish comprising acrylate varnish and / or varnishes containing epoxy or acrylate resins. In addition, the paint is designed as a topcoat and colored in the car color.
  • the sensor with the diaphragm pot 1 fulfills the requirements for corrosion and weather protection as well as visual surface properties and is thus ready for use in the vehicle. In a single painting step, a durable lacquer layer with the aforementioned properties was applied.
  • the diaphragm cup 10 has the diaphragm cup body 2 known from FIG. 1, but is coated with a lacquer layer 11, a metal layer 12 and a protective lacquer layer 13.
  • the diaphragm cup body 2 again consists of aluminum or aluminum alloy.
  • the diaphragm cup 10 is coated on the outside with the first lacquer layer 11, which in turn comprises acrylate lacquer or lacquers containing epoxy or acrylate resins.
  • the metal layer 12 is located with a thickness in the range 20 nm - 5 microns. This is the protective lacquer layer 13 of clearcoat.
  • the diaphragm pot body 2 was manufactured from aluminum or aluminum alloy. Subsequently, the membrane pot body 2 was provided with the varnish layer 11 by means of an electrophoretic dip coating, in particular an anaphoretic dip coating, the varnish comprising acrylate varnish and / or varnishes containing epoxy or acrylate resins. Subsequently, the metal layer 12 was deposited by means of vacuum deposition. To protect the metal layer 12, the protective lacquer layer 13 of clear lacquer was applied.
  • the sensor with the diaphragm cup 10 meets the requirements for corrosion and weather protection and a special shiny metallic visual appearance and is ready to use in the vehicle.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un pot à membrane (1) pour un transducteur à ultrasons comportant une paroi (4) pour supporter une membrane (5) qui peut être excitée par des oscillations. Le pot à membrane présente un corps (2) en aluminium ou en alliage d'aluminium. Une couche de peinture (8, 11) choisie dans le groupe comprenant la peinture acrylate et les peintures qui contiennent de la résine époxy ou acrylate est adjacente au corps (2) du pot à membrane.
PCT/EP2010/054405 2009-05-11 2010-04-01 Pot à membrane pour un transducteur à ultrasons et capteur ainsi équipé WO2010130504A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009002983.4 2009-05-11
DE200910002983 DE102009002983A1 (de) 2009-05-11 2009-05-11 Membrantopf für einen Ultraschallwandler und Sensor damit

Publications (1)

Publication Number Publication Date
WO2010130504A1 true WO2010130504A1 (fr) 2010-11-18

Family

ID=42260334

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/054405 WO2010130504A1 (fr) 2009-05-11 2010-04-01 Pot à membrane pour un transducteur à ultrasons et capteur ainsi équipé

Country Status (2)

Country Link
DE (1) DE102009002983A1 (fr)
WO (1) WO2010130504A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013109349A1 (de) * 2013-08-29 2015-03-05 Endress + Hauser Flowtec Ag Ultraschallwandler und Ultraschall-Durchflussmessgerät

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010063442A1 (de) * 2010-12-17 2012-06-21 Robert Bosch Gmbh Schallwellenbasierter Sensor mit einer Schutzschicht zur Umfelddetektion und Verwendung desselben
US20140157894A1 (en) * 2012-12-12 2014-06-12 Tung Thih Electronic Co., Ltd. Transducer Case
CN103900629A (zh) * 2012-12-24 2014-07-02 同致电子企业股份有限公司 传感器外壳

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4330747C1 (de) * 1993-09-10 1995-02-16 Siemens Ag Ultraschallwandler und Verfahren zu dessen Herstellung
JPH07195031A (ja) * 1993-12-29 1995-08-01 Shinko Alcoa Yuso Kizai Kk 成形性と耐疵付性に優れた有機被覆アルミ板材料
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
DE102004031310A1 (de) 2004-06-29 2006-01-19 Robert Bosch Gmbh Membrantopf für einen Ultraschallwandler
DE102006026247A1 (de) * 2005-06-09 2006-12-21 Denso Corp., Kariya Ultraschallsensorvorrichtung und Ultraschallwandler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4330747C1 (de) * 1993-09-10 1995-02-16 Siemens Ag Ultraschallwandler und Verfahren zu dessen Herstellung
JPH07195031A (ja) * 1993-12-29 1995-08-01 Shinko Alcoa Yuso Kizai Kk 成形性と耐疵付性に優れた有機被覆アルミ板材料
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
DE102004031310A1 (de) 2004-06-29 2006-01-19 Robert Bosch Gmbh Membrantopf für einen Ultraschallwandler
DE102006026247A1 (de) * 2005-06-09 2006-12-21 Denso Corp., Kariya Ultraschallsensorvorrichtung und Ultraschallwandler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013109349A1 (de) * 2013-08-29 2015-03-05 Endress + Hauser Flowtec Ag Ultraschallwandler und Ultraschall-Durchflussmessgerät

Also Published As

Publication number Publication date
DE102009002983A1 (de) 2010-11-18

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