WO2012171823A2 - Dispositif d'émission et/ou de réception de signaux sonores - Google Patents

Dispositif d'émission et/ou de réception de signaux sonores Download PDF

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Publication number
WO2012171823A2
WO2012171823A2 PCT/EP2012/060510 EP2012060510W WO2012171823A2 WO 2012171823 A2 WO2012171823 A2 WO 2012171823A2 EP 2012060510 W EP2012060510 W EP 2012060510W WO 2012171823 A2 WO2012171823 A2 WO 2012171823A2
Authority
WO
WIPO (PCT)
Prior art keywords
heat
carrier
side electrode
electromechanical
layer
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.)
Ceased
Application number
PCT/EP2012/060510
Other languages
German (de)
English (en)
Other versions
WO2012171823A3 (fr
Inventor
Michael Helmle
Andre Gerlach
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
Publication of WO2012171823A2 publication Critical patent/WO2012171823A2/fr
Publication of WO2012171823A3 publication Critical patent/WO2012171823A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/521—Constructional features
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52004—Means for monitoring or calibrating
    • G01S7/52006—Means for monitoring or calibrating with provision for compensating the effects of temperature
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
    • G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles

Definitions

  • the invention relates to a device for transmitting and / or receiving sound signals
  • Acoustic signals in particular ultrasound, comprising an electromechanical foil, which is connected to at least one front-side electrode and at least one rear-side electrode. Furthermore, the invention also relates to a use of the device. State of the art
  • Ultrasound for example, are used as ultrasonic sensors for environment detection.
  • a signal is sent by a transmitter, which is an object in the
  • Detection range of the sensor is reflected.
  • the reflected echo is from a
  • Receiver received and determined from the runtime the distance to the object.
  • transmitter and receiver or a sensor which first sends a sound pulse and receives the echo after swinging.
  • sensors are also referred to as transceivers.
  • ultrasonic sensors are used, for example, to monitor the surroundings of a motor vehicle, for example for automatic parking systems or for blind spot monitoring.
  • sensors can also be used in robots, for example in driverless transport systems, automatic
  • ultrasonic sensors are currently being built which operate on a piezoelectric basis.
  • electromechanical foils for transmitting and / or receiving sound signals.
  • the construction and production of such films are described, for example, in US 4,654,546. Due to the high frequency of an ultrasonic signal and the associated
  • Movement in the electromechanical foil arises when sending and receiving the signals heat. This leads to an undesirable heating of the sensor. Alternatively, it can also come from the outside to a heat on the sensor element.
  • Ultrasonic sensors are not used because with appropriate heat-dissipating layers, the vibrations of the sensor are attenuated. An appropriate one
  • a device for transmitting and / or receiving sound signals, in particular ultrasound, comprises an electromechanical film which is connected to at least one front-side electrode and at least one rear-side electrode, wherein the electromechanical film is connected to a carrier in a heat-conducting manner.
  • An electromechanical film according to the present invention comprises a membrane of a so-called ferroelectret material.
  • Ferroelektret materials in particular closed-cell polymer foams are referred to, in which at the
  • Interface of individual pores positive and negative electrostatic charges are permanently localized. Due to the impressed electrostatic charges, the individual pores expand upon application of an electrical voltage or contract with reverse polarization. This makes it possible, by appropriate excitation to generate a vibration that can be sent as a sound pulse. Accordingly, upon impact of sound waves by the mechanical change in the size of the pores, a voltage can be generated which can be tapped.
  • fluorine-based polymers for example polytetrafluoroethylene, polyfluoroethylene propylene and
  • Polyvinylidene fluoride Also suitable, for example, polyethylene terephthalate.
  • copolymers of these polymers are also suitable.
  • one side of the film is generally metallized over the entire surface.
  • This layer serves as a ground electrode.
  • On the opposite side of the full metallized side electrodes are applied in each case at the positions at which the respective transmitter and / or receiver are to be located.
  • Both the full-surface ground electrode and the electrodes at the positions, which each serve as transmitter and / or receiver, are applied, for example, by electroless and / or galvanic deposition, chemical deposition methods or physical deposition methods.
  • Particularly suitable for applying the metallization for the electrodes are methods in which the metal is vapor-deposited on the electromechanical film, for example CVD (Chemical Vapor Deposition) method or PVD (Physical Vapor Deposition) method.
  • the electrodes it is also possible to form none of the electrodes over the entire surface, but to make both the front side electrode and the rear side electrode opposite to each other. However, it is preferred to design either the front-side electrode or the rear-side electrode over the entire surface. If the front-side electrode and / or the rear-side electrode is a full-surface metal layer, this can be achieved in a first embodiment according to the invention
  • Embodiment for heat dissipation are connected to the carrier.
  • the electrode formed over the entire area to a portion of the carrier which conducts heat well.
  • an insulating layer is applied to the electromechanical foil and the at least one front-side electrode or the at least one rear-side electrode, and a heat-conductive layer on the insulating layer for heat removal.
  • the applied insulating layer serves in particular as electrical insulation. Suitable materials for the insulating layer are any dielectric materials,
  • Suitable polymers are, for example, polyethylene, polypropylene, polyvinyl chloride, polyamide, polyester, or polyurethanes.
  • a "good heat-conducting" is understood as meaning a material having a thermal conductivity which is so great that during operation of the device a thermal conductivity is achieved
  • Working temperature heated and the sensor element can be operated at substantially constant temperature.
  • the good heat-conducting layer applied to the insulating layer is preferably a metallic layer.
  • the good heat-conducting layer can, as well as the electrodes by electroless and / or galvanic deposition or by chemical or
  • the good heat-conducting layer is thermally conductively connected to the carrier.
  • the good heat-conducting layer are, for example, copper, aluminum, silver, brass or steel.
  • the electrodes in particular if they are used as a heat-conducting layer, are suitable, for example, copper, silver, gold or aluminum.
  • the carrier In order to be able to conduct the heat from the electromechanical film to the carrier, it is preferred for the carrier to contain a material which conducts heat well.
  • the heat from the electromechanical film is then passed through the heat-conductive connection via the good heat-conducting layer to the good heat-conducting material of the carrier. It is both possible that the entire carrier is made of a good heat conducting material or only parts of the carrier of a good heat conducting material and the base of the Carrier made of a poorly heat-conductive material.
  • the electromechanical foil is then connected to the good heat-conducting sections of the carrier.
  • a “poorly heat-conducting" is a
  • Thermal conductivity understood that is so small that the heat generated during operation of a sensor element can not be dissipated and therefore the sensor element heats up.
  • plastics which may also have a low heat transfer coefficient.
  • metallic sections can be used.
  • the carrier for example of a material with a good heat storage capacity.
  • heat is transferred from the sensors to the heat-storing material when the sensors are heated, and heat is transferred from the heat-storing material back to the sensor as the sensors cool.
  • This makes it possible to operate the sensor at a substantially constant temperature.
  • an insulating layer is accommodated between the carrier and the electrode of the electromechanical foil is. Any electrically insulating material is suitable for the insulating layer, in particular plastic materials are suitable.
  • the device according to the invention for transmitting and / or receiving sound signals is suitable, for example, for detecting the surroundings of driver assistance systems in motor vehicles. Furthermore, the device can also be used to detect the environment in autonomously moving systems.
  • autonomously moving systems are, for example, robots, for example, driverless lawnmowers or vacuum cleaners, or even driverless transport systems, such as those used in industry.
  • the carrier is a bumper of the motor vehicle.
  • the electromechanical foil is in this case with the bumper of the motor vehicle connected in such a way that in each case at the positions at which
  • Ultrasonic sensors are to be located, an electrode or an array is formed. Alternatively, it is also possible to apply each foil sections at the positions at which sensors are to be located. These positions have a good connection to
  • Airborne field but need not be in the bumper.
  • either a full-surface electrode of the device is thermally conductively connected to the carrier or the separate provided heat-dissipating layer.
  • Figure 1 A device according to the invention for transmitting and / or receiving
  • Figure 2 A device according to the invention for transmitting and / or receiving
  • a device 1 for transmitting and / or receiving sound signals comprises an electromechanical film 3, which is provided on one side with a metallic coating 5.
  • the metallic coating 5 acts as a ground electrode 7.
  • Coating 5 can, as shown in Figure 1, the full surface on the
  • Each transducer 9 further comprises a transducer electrode 1 1.
  • the transducer electrode 1 1 is the shape and size of the transducer 9 again. If not the entire surface of the electromechanical film 3 is coated with a metallic coating 5 to form the ground electrode 7, but only the one
  • Ground electrode has the same shape as the transducer electrode 1 1.
  • the ground electrode slightly larger than the transducer electrode 1 1.
  • the converter electrodes 11 are formed on a printed circuit board 13.
  • the circuit board 13 can be made of any known to the expert material for printed circuit boards. It is preferred to form the printed circuit board 13 from a flexible material.
  • an adhesive layer 15 is applied. With the adhesive layer 15, the electromechanical film 3 is attached to the circuit board 13 and the transducer electrodes 1 1.
  • adhesive for the adhesive layer 15 any adhesive with which the electromechanical film 3 can be mounted on the circuit board 13 is suitable. It is important to ensure that an adhesive is used that does not damage the electromechanical film 3.
  • a protective layer 17 is for example a polymer layer with which the device 1 is protected for transmitting and / or receiving sound signals against mechanical effects.
  • the entire device 1 for sending and / or
  • the further protective layer 19 serves to protect the device 1 for transmitting and / or receiving sound signals against external influences, for example against weather influences or mechanical influences. In order to dissipate heat generated during operation of the device 1, which is
  • the heat-dissipating carrier 21 is preferably made of a metallic material that is good heat-conducting. In order to remove the heat from the heat-dissipating carrier 21, this is, for example, when using the device for transmitting and / or
  • the heat-dissipating carrier 21 is preferably thermally connected to the body. This can be done for example by a welded joint.
  • the heat-dissipating carrier 21 is preferably made of a metal, for example steel, aluminum, brass or copper.
  • the heat-dissipating carrier 21, on which the circuit board 13 is fixed to the sound transducers 9, may be, for example, a body component.
  • the further protective layer 19 may be, for example, a vehicle paint in this case, which also represents a protection against environmental influences.
  • the circuit board with the device 1 for transmitting and / or receiving sound signals When the circuit board is made of a flexible material, this has the advantage that the entire device for transmitting and / or receiving sound signals is flexible and can be adapted to the surface on which it is applied.
  • the attachment of the device for transmitting and / or receiving sound signals is effected, for example, by gluing the printed circuit board on the heat-dissipating carrier 21st In addition to sticking any other type of attachment can be selected.
  • Essential in the attachment is a heat-dissipating attachment. When the circuit board is bonded to the heat-dissipating carrier 21, it is particularly advantageous when a thermally conductive adhesive is used.
  • FIG. 2 shows a device for transmitting and / or receiving sound signals in a second embodiment.
  • the device for transmitting and / or receiving sound signals comprises an electromechanical film 3, a ground electrode 7 applied as metallic coating 5 on the electromechanical film 3, two transducer electrodes 1 1, each defining a sound transducer 9.
  • the transducer electrodes 1 1 are formed as conductor tracks on a printed circuit board 13.
  • the electromechanical foil with the applied on it Metallic coating 5 is fixed with an adhesive layer 15 on the circuit board 13 with the transducer electrodes 1 1 applied thereto.
  • the heat dissipating carrier 21 is designed to have a surface whose dimensions are the size of the device 1 for transmitting and / or receiving
  • transducer electrode 1 1 To operate the transducer, a voltage is applied between transducer electrode 1 1 and ground electrode 7. By applying the voltage, the electromechanical film 3 is excited to vibrate by applying electric charges impressed on pores 23 of the electromechanical film by applying the voltage to the electromechanical film
  • the electromechanical film 3 When a sound signal impinges on the sound transducer 9, the electromechanical film 3 begins to vibrate and due to the charges on the pores 23, a voltage is generated. This can be tapped via the conversion electrodes 1 1. Based on the sound propagation time between emitted signal and received echo, the distance to an object can be determined.
  • electromechanical film 3 which can be used for example as ultrasonic sensors as distance sensors on motor vehicles. It is also possible to provide only one transducer electrode 1 1. Furthermore, it is also possible, the heat-dissipating carrier 21 on the side of
  • ground electrode can also be connected in a heat-conducting manner to a carrier and dimensioned such that the ground electrode simultaneously serves as a heat-dissipating carrier.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

L'invention concerne un dispositif d'émission et/ou de réception de signaux sonores, en particulier d'ultrasons, comprenant un film électromécanique (3) qui est connecté à au moins une électrode avant (7) et au moins une électrode arrière (11), le film électromécanique (3) étant connecté à un support de manière thermoconductrice. L'invention concerne par ailleurs une utilisation du dispositif en tant que capteur à ultrasons pour la détection d'un environnement, en particulier pour la détection de l'environnement d'un véhicule automobile.
PCT/EP2012/060510 2011-06-15 2012-06-04 Dispositif d'émission et/ou de réception de signaux sonores Ceased WO2012171823A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011077558.7 2011-06-15
DE102011077558A DE102011077558A1 (de) 2011-06-15 2011-06-15 Vorrichtung zum Senden und/oder Empfangen von Schallsignalen

Publications (2)

Publication Number Publication Date
WO2012171823A2 true WO2012171823A2 (fr) 2012-12-20
WO2012171823A3 WO2012171823A3 (fr) 2013-06-27

Family

ID=46354177

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/060510 Ceased WO2012171823A2 (fr) 2011-06-15 2012-06-04 Dispositif d'émission et/ou de réception de signaux sonores

Country Status (2)

Country Link
DE (1) DE102011077558A1 (fr)
WO (1) WO2012171823A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015211539A1 (de) * 2015-06-23 2016-12-29 Bayerische Motoren Werke Aktiengesellschaft Kraftfahrzeug mit einer Ultraschallsensoranordnung
DE102017223089A1 (de) 2017-12-18 2019-06-19 Robert Bosch Gmbh Sensoranordnung zum Senden und/oder Empfangen eines Schallsignals

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4654546A (en) 1984-11-20 1987-03-31 Kari Kirjavainen Electromechanical film and procedure for manufacturing same
DE102007037543A1 (de) 2006-08-15 2008-02-21 Qimonda Ag Gehäuse für eine integrierte Schaltung mit einer Wärmeabgabeeinheit und Verfahren zu dessen Herstellung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2654520B1 (fr) * 1989-11-10 1992-08-14 Midirobots Dispositif de detection d'objets par capteurs ultrasoniques.
US7105986B2 (en) * 2004-08-27 2006-09-12 General Electric Company Ultrasound transducer with enhanced thermal conductivity
EP1825814B1 (fr) * 2004-12-09 2013-02-20 Hitachi Medical Corporation Sonde ultrasonore
JP4843395B2 (ja) * 2006-07-10 2011-12-21 日本電波工業株式会社 超音波探触子

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4654546A (en) 1984-11-20 1987-03-31 Kari Kirjavainen Electromechanical film and procedure for manufacturing same
DE102007037543A1 (de) 2006-08-15 2008-02-21 Qimonda Ag Gehäuse für eine integrierte Schaltung mit einer Wärmeabgabeeinheit und Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
DE102011077558A1 (de) 2012-12-20
WO2012171823A3 (fr) 2013-06-27

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