EP3405984A1 - Ensemble transducteur acoustique et procédé de fabrication d'un ensemble transducteur acoustique - Google Patents

Ensemble transducteur acoustique et procédé de fabrication d'un ensemble transducteur acoustique

Info

Publication number
EP3405984A1
EP3405984A1 EP16810329.9A EP16810329A EP3405984A1 EP 3405984 A1 EP3405984 A1 EP 3405984A1 EP 16810329 A EP16810329 A EP 16810329A EP 3405984 A1 EP3405984 A1 EP 3405984A1
Authority
EP
European Patent Office
Prior art keywords
sound transducer
housing
sealing compound
sealing
transducer elements
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
Application number
EP16810329.9A
Other languages
German (de)
English (en)
Other versions
EP3405984B1 (fr
Inventor
Bernd SCHEUFELE
Guenter 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 EP3405984A1 publication Critical patent/EP3405984A1/fr
Application granted granted Critical
Publication of EP3405984B1 publication Critical patent/EP3405984B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • G10K9/12—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
    • G10K9/125—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 with a plurality of active elements
    • 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
    • G10K9/22—Mountings; Casings

Definitions

  • the invention relates to a sound transducer arrangement and to a method for the
  • Sound transducer arrangement in which the sound transducer elements are arranged in the region of an end face of a housing.
  • the juxtaposed sound transducer elements are separated from each other by web elements made of an elastomer in the region of an opening formed on the end face of the housing. Sound-effective surfaces of the
  • Sound transducer elements in the form of a membrane are each with a
  • Coupled piezoelectric element The membrane is covered on the side facing away from the piezoelectric element with the interposition of an adhesive layer of a protective film, wherein the protective film with the external environment of the
  • Sound transducer assembly is in communication.
  • the spaces between the transducer elements and between the transducer elements and the housing are filled by a plastic to cause an acoustic decoupling of the individual transducer elements and a seal of the housing.
  • the mentioned protective film also serves to seal the housing. Details of a seal of the housing on the
  • the present invention seeks to form a sound transducer assembly such that on the one hand a particularly advantageous embodiment manufacturing technology can be achieved, and on the other hand, the transducer assembly is effectively protected against the entry of media or moisture into the housing.
  • transducer assembly with the features of claim 1 essentially in that between an inner cross section of the housing and the outer cross section of a support device on which the transducer elements are arranged, a
  • the invention is formed on the circumferential side gap that the carrier device is at least indirectly covered by a sealing compound on the side facing away from the transducer elements, and that a sealing element is provided which is adapted to access the sealing compound via said gap in the region of the interior of the housing prevent, in which the sound transducer elements are located.
  • the invention is based, on the one hand, on the idea that by a circumferential gap between a carrier device on which the individual Sound transducer elements are arranged, and the inner cross-section of the housing allows a particularly simple assembly, as the
  • Carrier device or the housing with relatively large tolerances can be produced or the gap simplifies installation. Thus, it does not depend on the exact size of the mentioned gap, but rather by the gap easy axial joining or insertion of the carrier element in the
  • Such a sealing compound has the particular advantage that it fills or bridges gaps on the one hand, and on the other hand in contrast to mechanical
  • Closure elements which are optionally connected by separate fastening means to the housing, also particularly simple with the housing in
  • sealing element which is designed to prevent access of the sealing compound via the gap in the interior of the housing ensures that the sealing compound covers only the rear area of the housing of the housing, but does not completely fill the interior of the housing. In particular, this prevents functional impairments of the sound transducer elements which would otherwise possibly occur if the sealing compound comes into connection with the sound transducer elements. In addition, can be through the sealing element, the amount of
  • this is at least substantially sleeve-shaped or pot-shaped.
  • a carrier device designed as a support plate for the
  • Carrier device in the housing allows.
  • a support plate as a support means that the sound transducer assembly advantageously has the lowest possible height, for example, a total height of the
  • the arrangement of the sealing compound is preferably such that the housing encloses the sealing compound on the circumference with an inner circumference or an inner wall.
  • a seal in the region between the sealing compound and the housing is made possible over the entire casting height of the sealing compound with the housing.
  • the inner circumference of the housing forms a boundary for the potting compound during insertion into the housing.
  • Housing arranged sealing member may be formed in different ways.
  • the sealing element is designed as an elastic sealing element, in particular as a sealing ring, which is arranged in the gap.
  • the use of an elastic sealing element or a sealing ring makes it possible that of
  • Sealing element is this as a in the interior of the housing
  • the housing is designed as a plastic injection molded part. This allows a particularly good adhesion between the housing and the sealing compound, wherein the housing has a low weight and is itself insensitive to corrosion.
  • a further advantageous embodiment of the invention relates to the electrical contacting of the sound transducer elements. It is advantageous if the carrier device on the side remote from the transducer elements side has a plug connection element for electrical contacting, wherein the potting compound surrounds the plug connection element in regions. Such a configuration makes it possible not to arrange the connector element directly to the housing, but to attach in a pre-assembly step to the support means. This allows, for example, a functional test of the carrier device with the arranged thereon
  • Sound transducer elements allow before the unit is inserted or mounted in a housing. In addition, then, for example, no openings, etc. are required for the plug connection to the housing wall. Furthermore, in such a structural design by the
  • Plug connection element encloses at the periphery in areas.
  • a further preferred embodiment relates to a sound transducer arrangement in which some or all sound transducer elements are operated as transmitter elements.
  • a sound transducer arrangement it is necessary for such a sound transducer arrangement to have a transmission transformer or a transformer.
  • this transmission transformer is arranged integrated in the connector element and with this as a structural unit of a polymer (eg
  • Epoxy resin is encapsulated.
  • Transmitter for example, on the opposite of the transducers
  • the sealing compound forms both a protection against the ingress of moisture or media into the interior of the housing, as well as a mechanical and electrical protection of the circuit substrate, so that on other covering or sealing elements, such as a lid o.ä. can be waived.
  • the invention also relates to a method for producing a so far
  • the method according to the invention comprises at least the following steps: In a first step, a carrier device with optionally attached thereto
  • Fig. 1 is a partial longitudinal section through an inventive
  • Fig. 2 is a simplified plan view of a transducer device used in the transducer assembly according to the Fig. 1 with arranged thereon transducer elements and
  • FIG. 3 is a comparison with FIG. 1 modified embodiment of
  • FIG. 1 shows a first sound transducer arrangement 100 according to the invention, as it is used in particular as part of a driver assistance system in a motor vehicle, in particular for distance measurement and recognition of objects during parking operations.
  • Sound transducer assembly 100 is arranged in particular in the region of the front and / or rear bumper of the motor vehicle. Alternatively, the
  • Sound transducer assembly 100 but also by way of example, and not limitation, as part of a 3-D environment sensor, for example, in robots or in industrial trucks serve.
  • the sound transducer arrangement 100 has a housing 11 made of plastic, in particular designed as an injection molded part, which is designed in the shape of a sleeve or cup.
  • a plurality of sound transducer elements 10 are arranged in the interior 12 of the housing 11 .
  • the sound transducer elements 10 are in particular by means of an electrically conductive adhesive 13 with a carrier plate
  • the carrier plate 14 connected.
  • the carrier plate 14 consists of a technical ceramic, which is covered with a metallization layer 16 on the upper side and the lower side and possibly on side surfaces.
  • the sound transducer elements 10 each have an example of aluminum existing support member 18 which is formed in cross-section U-shaped.
  • the recognizable in Fig. 1 side legs 19 of the support member 18 are connected by means of the conductive adhesive 13 with the support plate 14 (rigid).
  • the two side legs 19 interconnecting base portion forms a rectangular, sound-effective surface in the form of a vibratable diaphragm 29.
  • On the support plate 14 facing side of the membrane 29 is by means of a conductive adhesive 28 is not shown on both sides
  • the piezo elements 25 are in turn connected using further conductive adhesive 24 with a common flex foil 22, which serves to forward the piezoelectric signals.
  • the support members 18 protrude with the membranes 29 in an opening 26 of the
  • Housing 11 in the region of a radially inwardly projecting flange 27 of the housing 1 1 and preferably terminate flush with the outer end face 31 of the flange 27 and the housing 11 from.
  • the individual diaphragms 29 or piezoelements 25 of the sound transducer elements 10 are separated from one another or acoustically decoupled by elastomer elements 32.
  • the elastomeric elements 32 have in addition to their acoustically decoupling function at the same time also a sealing against the entry of media into the interior 12 of the housing 11.
  • the damping mass 35 can be, for example, an elastomer in the form of Fermasil or another damping material with or without gas inclusions.
  • the feeding of the damping mass 35 is preferably carried out after the mounting of the carrier plate 14 with sound transducer elements 10 located thereon over at least one arranged in the region of the carrier plate 14
  • the sound transducer elements 10 facing away from the side of the support means 15 and the support plate 14 is interposition of conductive adhesive 37 and the
  • Flex foil 22 at least partially covered by a circuit substrate 38, in particular in the form of a printed circuit board.
  • electronic components 39 such as an ASIC, are arranged on the circuit carrier 38.
  • a connector connecting element 40 which consists in particular of plastic, is connected to the circuit carrier 38.
  • Plug connection element 40 is used for electrical contacting of
  • Sound transducer elements 10 may be arranged parallel to each other. Rather, it can be provided that on the one substantially rectangular contour with rounded corner areas having support plate 14 arranged at 90 ° to each other arranged transducer elements 10 are arranged. Others too
  • the sound transducer elements 10 can serve either as transmitter elements or as receiver elements. In the exemplary embodiment illustrated in FIG. 1, all the sound transducer elements 10 act as receiving elements by way of example.
  • the sound transducer assembly 100 is particularly educated. With reference to FIG. 1, it is explained that between the outer periphery 41 of the carrier device
  • a circumferential gap 45 is formed.
  • a sealing element 46 in the form of a sealing ring 47 is arranged on the side facing the sound transducer elements 10.
  • the interior 12 of the housing 11 is filled with a sealing compound 50 from the side of the carrier device 15 facing away from the sound transducer elements 10.
  • the sealing compound 50 is filled by the (open) rear end face 51 of the housing 1 1 in the inner cross section of the housing 1 1 and fills the interior of the housing 11 up to the level of the sealing member 46.
  • FIG. 1 it can also be seen from FIG. 1 that also the
  • Connector member 40 circumferentially also partially from the
  • Sealing compound 50 is enclosed.
  • the material of the sealing compound 50 the material of the sealing compound
  • the carrier device 15 with optionally attached or mounted sound transducer elements 10 and the plug connection element 40 is introduced from the end face 51 into the housing 11 into an axial end or target position.
  • the sealing compound 50 formed prior to curing as potting compound is introduced or metered into the housing 1 1 from the end face 51 by means of a suitable metering device (for example in the form of a screw or jet dispenser) until the sealing compound 50 leaves the sealing compound Inner cross-section of the housing 11 in the region of the end face 51 fills.
  • the sealing element 46 causes that
  • Sealing compound 50 does not reach into the area of the sound transducer elements 10.
  • the sound transducer assembly 100a shown in FIG. 3 differs from the sound transducer assembly 100 essentially by two features: Firstly, the housing 11 a has a flange acting as an axial stop, from the inner wall 42 of the housing 1 1a radially inwardly projecting
  • housing edge 55 against which the support means 15 and the support plate 14 axially abuts.
  • the housing edge 55 is arranged in partial overlap with the carrier plate 14 or the carrier device 15. Due to the axial contact of the support plate 14 of the housing edge 55 acts simultaneously as
  • the plug connection element 40a has a transmission transformer 60 in the form of a transformer, which is arranged integrally in the plug connection element 40a and surrounded by the material of the plug connection element 40a.
  • the transmitting transformer 60 protrudes beyond the material of the sealing compound 50 on the side facing away from the carrier device 15.
  • the circuit carrier 38 has the plug connection element 40a in one piece on this molded-on pins 61, which in corresponding openings of the
  • Intervene circuit carrier 38 38.
  • the housing 1 1a has an outwardly projecting flange 65 on which, if appropriate, an insert ring 66, which is preferably made of an elastomer, rests axially.
  • the flange 65 and the optionally provided mounting ring 66 serve the installation or integration of the sound transducer assembly 100a in a vehicle or a mounting location.
  • the sound transducer arrangement 100, 100a described so far and / or their production can be modified or modified in many ways without deviating from the idea of the invention. That's the way it works
  • Carrier 15 are brought into the housing 11 to its axial end position. Finally, if necessary, the introduction of the damping mass 35 into the housing 11 and the pouring of the end face 51 of the housing 1 1 with the sealing compound 50 takes place.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Casings For Electric Apparatus (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

L'invention concerne un ensemble transducteur acoustique (100 ; 100a) qui comprend un dispositif de support (15) servant à la fixation de plusieurs éléments de transducteur acoustique (10), un boîtier (11) délimitant un espace intérieur (12) et destiné à recevoir le dispositif de support (15), un interstice (45) en particulier périphérique étant formé entre la section transversale intérieure du boîtier (11), formée par une paroi intérieure (42), et le pourtour extérieur (41) du dispositif de support (15), le dispositif de support (15) étant recouvert d'un mastic d'étanchéité (50), au moins indirectement, du côté opposé aux éléments de transducteur acoustique (10), et ledit ensemble comprenant un élément d'étanchéité (46) qui est conçu pour empêcher que le mastic d'étanchéité (50) ne pénètre dans l'espace intérieur (12) du boîtier (11), en passant par l'interstice (45), du côté du dispositif de support (15) opposé au mastic d'étanchéité (50).
EP16810329.9A 2016-01-20 2016-12-09 Ensemble transducteur acoustique Active EP3405984B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016200658.4A DE102016200658A1 (de) 2016-01-20 2016-01-20 Schallwandleranordnung und Verfahren zur Herstellung einer Schallwandleranordnung
PCT/EP2016/080451 WO2017125203A1 (fr) 2016-01-20 2016-12-09 Ensemble transducteur acoustique et procédé de fabrication d'un ensemble transducteur acoustique

Publications (2)

Publication Number Publication Date
EP3405984A1 true EP3405984A1 (fr) 2018-11-28
EP3405984B1 EP3405984B1 (fr) 2022-03-16

Family

ID=57544425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16810329.9A Active EP3405984B1 (fr) 2016-01-20 2016-12-09 Ensemble transducteur acoustique

Country Status (5)

Country Link
EP (1) EP3405984B1 (fr)
KR (1) KR20180105172A (fr)
CN (1) CN108496256B (fr)
DE (1) DE102016200658A1 (fr)
WO (1) WO2017125203A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3107878A1 (de) * 1981-03-02 1982-09-16 Honeywell-Elac-Nautik Gmbh, 2300 Kiel Unterwasser-schallwandler
KR20060129198A (ko) * 2003-11-25 2006-12-15 코닌클리즈케 필립스 일렉트로닉스 엔.브이. 전자 음향 변환기를 포함하는 전자 음향 장치
DE102009046144A1 (de) * 2009-10-29 2011-05-19 Robert Bosch Gmbh Ultraschallwandler zum Einsatz in einem fluiden Medium
DE102010030189A1 (de) * 2010-06-16 2011-12-22 Robert Bosch Gmbh Verfahren zur Herstellung eines Ultraschallwandlers zum Einsatz in einem fluiden Medium
DE102010062990A1 (de) 2010-12-14 2012-06-21 Robert Bosch Gmbh Schallwandler mit zumindest einem Piezoelement
ITMO20110053A1 (it) * 2011-03-07 2012-09-08 Meta System Spa Procedimento per la realizzazione di un dispositivo sensore, in particolare di un dispositivo sensore impiegabile in sistemi di assistenza al parcheggio per veicoli
DE102012222015B4 (de) * 2012-11-30 2019-07-18 Infineon Technologies Ag Feuchtigkeitsdichtes Halbleitermodul und ein Verfahren zu dessen Herstellung
DE102013213493A1 (de) 2013-07-10 2015-01-15 Robert Bosch Gmbh Schallwandleranordnung

Also Published As

Publication number Publication date
WO2017125203A1 (fr) 2017-07-27
DE102016200658A1 (de) 2017-07-20
EP3405984B1 (fr) 2022-03-16
CN108496256A (zh) 2018-09-04
CN108496256B (zh) 2022-09-23
KR20180105172A (ko) 2018-09-27

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