EP3343946A1 - Akustische vorrichtung, insbesondere für anwendungen in der automobilindustrie - Google Patents

Akustische vorrichtung, insbesondere für anwendungen in der automobilindustrie Download PDF

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Publication number
EP3343946A1
EP3343946A1 EP17210765.8A EP17210765A EP3343946A1 EP 3343946 A1 EP3343946 A1 EP 3343946A1 EP 17210765 A EP17210765 A EP 17210765A EP 3343946 A1 EP3343946 A1 EP 3343946A1
Authority
EP
European Patent Office
Prior art keywords
acoustic
acoustic conduit
conduit
support
anyone
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
EP17210765.8A
Other languages
English (en)
French (fr)
Other versions
EP3343946B1 (de
Inventor
Matteo De Cesare
Antonio BARBUTO
Nicola TORCOLINI
Federico Monti
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.)
Marelli Europe SpA
Original Assignee
Magneti Marelli SpA
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 Magneti Marelli SpA filed Critical Magneti Marelli SpA
Publication of EP3343946A1 publication Critical patent/EP3343946A1/de
Application granted granted Critical
Publication of EP3343946B1 publication Critical patent/EP3343946B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • H04R1/086—Protective screens, e.g. all weather or wind screens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Definitions

  • the present invention relates to an acoustic device, in particular for applications in the automotive industry.
  • acoustic devices comprising a support; a microphone device connected to the support and having a sensitive area; an acoustic conduit obtained in a housing connected to the support and designed to convey the sound pressure waves generated by an external acoustic source towards the sensitive area of the microphone device.
  • the acoustic device further comprises a membrane interposed between the microphone device and the acoustic conduit to protect the sensitive area from external agents.
  • IP rating ingress protection
  • the ingress protection rating for these applications must be equal to at least 6K7; in other words the device must be protected against the ingress of external objects and dust (the meaning of the first term "6K”) and, at the same time, the device must be protected against the ingress of liquid when immersed at a depth of 1 metre for 30 minutes (meaning of the second term "7").
  • Devices housed in the engine compartment must also meet the standards required by vehicle manufacturers in terms of the so-called specific ingress protection rating for high-pressure jets.
  • the specific ingress protection rating for high-pressure jets must be equal to at least IP6K9K; high-pressure water/air jets are typically directed on the device during cleaning operations using tools capable of generating jets of water/air at a pressure of more than 5 bar.
  • the devices of the type known in the prior art are able to withstand jets of water/air directed on said device at a pressure of between 0.1 and 1 bar.
  • the purpose of the present invention is therefore to provide an acoustic device, in particular for applications in the automotive industry, that overcomes the drawbacks of the prior art.
  • an acoustic device in particular for applications in the automotive industry, as claimed in the appended claims.
  • Figure 1 denoted as a whole by reference numeral 1 is an integrated device 1 comprising a support 2 bearing a microphone device 3 formed by a body 4 typically having a parallelepiped shape provided with a first and a second main face 6, 7 and with a side surface 8.
  • the body 4 is typically formed by a structural layer of semi-conducting material, such as silicon, which may be covered in conducting/insulating layers that are not illustrated.
  • the microphone device 3 is fixed to the support 2 in correspondence of the main face 6 defining an upper surface and is provided with a sensitive area 5.
  • the sensitive area 5 may be formed on the inside or on top of the main face 6 of the body 4.
  • the sensitive area 5 may be a membrane delimited at the bottom by a cavity buried in the body, or by a suspended membrane or comprise one or more layers arranged on top of the main face 6.
  • the support 2 has a parallelepiped shape with an area or base that is greater than the plate 3.
  • the device further comprises a housing 9 fixed on top of the support 2.
  • the support 2 is interposed between the housing 9 and the microphone device 3.
  • the housing 9 is made of a metal material.
  • the housing 9 is partially defined by a moulded body made of a standard moulding material, typically a plastic material, such as resin.
  • the housing 9 internally delimits an acoustic conduit 10 provided with a symmetry axis X.
  • the acoustic conduit 10 is defined by a funnel-shaped upper portion 11 which faces the acoustic source and a lower portion 12.
  • the upper portion 11 is coaxial to the symmetry axis X, and is defined by a truncated cone-shaped surface 13 tapered towards the lower portion 12, which is also coaxial to the symmetry axis X and defined by a cylindrical surface 14.
  • the acoustic conduit 10 is made of a metal material. According to a further embodiment, the acoustic conduit 10 is made of a plastic material.
  • the device 1 further comprises a membrane 15 which is interposed between the support 2 and the lower portion 12 of the acoustic conduit 10.
  • the membrane 15 is rather thin and is designed to protect the sensitive area 5 and is oilproof, waterproof and dustproof.
  • the membrane 15 is made of a plastic material.
  • the lower portion 12 is L-shaped. In other words, the lower portion 12 is divided into a section 12A in communication with the upper portion 11 and coaxial to the symmetry axis X and a section 12B provided with an axis Y that is substantially orthogonal to the symmetry axis X and in communication with the sensitive area 5.
  • the membrane 15 is not directly exposed to the impact of any objects that enter the inside of the acoustic conduit 10 or of a high-pressure jet of water/air directed on the device 1.
  • the elbow bend in the lower portion 12 thus makes it possible to protect the membrane 15 against impacts with any objects that enter the inside of the acoustic conduit 10 and enables the energy of a high-pressure jet of water/air directed on the device 1 to be dissipated.
  • the diameter ⁇ guide of the inner surface 14 of the lower portion 12 is at maximum one third of the minimum wavelength ⁇ MIN of the sound pressure waves coming from the external acoustic sources.
  • the minimum wavelength ⁇ MIN of the sound pressure waves coming from the external acoustic sources is at least three times larger than the diameter ⁇ guide of the inner surface 14 of the lower portion 12.
  • the minimum wavelength ⁇ MIN of the sound pressure waves for dimensioning the diameter ⁇ guide (and, thus, the diameter ⁇ guide ) is determined at the end of a test phase as a function of the external acoustic sources that generate the pressure waves that hit the microphone device 3.
  • the acoustic conduit 10 does not introduce significant distortions up to the characteristic frequency.
  • the diameter ⁇ guide of the inner surface 14 of the portion 12 is constant.
  • the section 12A and the section 12B have the same inside diameter ⁇ guide .
  • the diameter ⁇ guide of the inner surface 14 of the portion 12 is variable.
  • the section 12A and the section 12B have different diameters; in particular, the section 12B has a smaller diameter than the section 12A.
  • the upper funnel-shaped portion 11 is made to convey and amplify the sound pressure waves coming from the external acoustic sources towards the lower portion 12.
  • the diameter of the cylindrical surface 14 and the angle that is formed between the truncated cone-shaped surface 13 and the cylindrical surface 14 are determined so as to progressively amplify the sound waves, as the frequency increases, without introducing distortions in the range of frequencies typical of the sound field (e.g., between 50Hz and 10kHz).
  • the microphone device 3 is connected to the outside via a through hole 16 made through the support 2 and is in communication with the acoustic conduit 10.
  • the through hole 16 is vertically superimposed on the sensitive area 5 and thus on the acoustic conduit 10, but it could be laterally offset or arranged in any suitable position and configuration.
  • the support 2 may be of any known type.
  • the support 2 may consist of a printed circuit board (PCB) made of an organic material or other organic multilayer substrate (such as, for instance, a Bismaleimide Triazine (BT) layer) for example of the land grid array (LGA) or ball grid array (BGA) type.
  • PCB printed circuit board
  • BT Bismaleimide Triazine
  • LGA land grid array
  • BGA ball grid array
  • the support 2 may, in turn, consist of a supporting plate made of a semi-conducting material, typically silicone.
  • the device 1 further comprises a heating element 17 that is arranged close to the acoustic conduit 10.
  • the heating element 17 is arranged close to the L-shaped bend in the lower portion 12.
  • the heating element 17 is arranged in correspondence of the connection between the upper portion 11 and the lower portion 12 of the acoustic conduit 10. The heating element 17 is controlled so as to heat the surface 13 and the surface 14, so that any deposits of particles or oil on such surfaces 13, 14 evaporate without undermining the transfer of the sound waves towards the sensitive area 5.
  • the microphone device 3 is fixed to the support 2 in correspondence of the main face 7 defining a lower surface and is interposed between the housing 9 and the support 2. In this case, the microphone device 3 is directly facing the acoustic conduit 10 and there is no need to provide the through hole 16 through the support 2.
  • the device described above achieves several advantages. Firstly, it is simple and economical to produce and the L-shaped bend in the lower portion 12 of the acoustic conduit 10 and the presence of the membrane 15 result in an effective solution that is able to meet the stringent standards required in terms of the ingress protection rating and of the specific ingress rating for high-pressure jets.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
EP17210765.8A 2016-12-27 2017-12-27 Akustische vorrichtung, insbesondere für anwendungen in der automobilindustrie Active EP3343946B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102016000131334A IT201600131334A1 (it) 2016-12-27 2016-12-27 Dispositivo acustico, in particolare per applicazioni in ambito automotive

Publications (2)

Publication Number Publication Date
EP3343946A1 true EP3343946A1 (de) 2018-07-04
EP3343946B1 EP3343946B1 (de) 2021-03-24

Family

ID=58609897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17210765.8A Active EP3343946B1 (de) 2016-12-27 2017-12-27 Akustische vorrichtung, insbesondere für anwendungen in der automobilindustrie

Country Status (3)

Country Link
EP (1) EP3343946B1 (de)
CN (1) CN108243373B (de)
IT (1) IT201600131334A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021113507A1 (de) 2021-05-26 2022-12-01 Paragon Gmbh & Co. Kgaa Außenmikrofon
DE102022205148B3 (de) 2022-05-24 2023-09-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Geschlossener Schallaufnehmer mit schalldurchlässiger Grenzfläche

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013099068A1 (ja) * 2011-12-28 2013-07-04 Ｎｅｃカシオモバイルコミュニケーションズ株式会社 携帯型電子機器
US20140198932A1 (en) * 2013-01-11 2014-07-17 Red Tail Hawk Corporation Microphone Environmental Protection Device
US20160234594A1 (en) * 2013-10-15 2016-08-11 Panasonic Intellectual Property Management Co., Ltd. Microphone

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CN2463914Y (zh) * 2001-01-17 2001-12-05 黄石矛 一种拾远音麦克风
CN1856179A (zh) * 2005-04-23 2006-11-01 珠海精准电子有限公司 麦克风
CN2834066Y (zh) * 2005-10-09 2006-11-01 深圳市豪恩电声科技有限公司 传声器固定连接器
CN200966132Y (zh) * 2006-09-30 2007-10-24 美律实业股份有限公司 全面板按键式麦克风
JP5356734B2 (ja) * 2008-06-20 2013-12-04 日本ゴア株式会社 音響部品及びその製造方法
CN201278576Y (zh) * 2008-06-26 2009-07-22 中兴通讯股份有限公司 一种防水电子设备
CN101917651A (zh) * 2010-08-06 2010-12-15 海能达通信股份有限公司 一种电声器件的防尘防水网
CN104254039A (zh) * 2014-09-03 2014-12-31 王远云 一种防水胶套
FR3026997B1 (fr) * 2014-10-10 2018-02-09 Cera Tsc Appui-tete de siege de vehicule automobile
WO2016095107A1 (zh) * 2014-12-16 2016-06-23 华为技术有限公司 麦克风套件及电子装置
CN106162394B (zh) * 2015-04-28 2023-07-25 钰太芯微电子科技（上海）有限公司 一种防水麦克风单体
CN205213006U (zh) * 2015-12-18 2016-05-04 歌尔声学股份有限公司 防水麦克风产品
CN105681988B (zh) * 2015-12-30 2019-01-22 临境声学科技江苏有限公司 一种线性阵列拾音器及控制方法

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WO2013099068A1 (ja) * 2011-12-28 2013-07-04 Ｎｅｃカシオモバイルコミュニケーションズ株式会社 携帯型電子機器
US20140198932A1 (en) * 2013-01-11 2014-07-17 Red Tail Hawk Corporation Microphone Environmental Protection Device
US20160234594A1 (en) * 2013-10-15 2016-08-11 Panasonic Intellectual Property Management Co., Ltd. Microphone

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021113507A1 (de) 2021-05-26 2022-12-01 Paragon Gmbh & Co. Kgaa Außenmikrofon
DE102022205148B3 (de) 2022-05-24 2023-09-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Geschlossener Schallaufnehmer mit schalldurchlässiger Grenzfläche

Also Published As

Publication number Publication date
CN108243373A (zh) 2018-07-03
EP3343946B1 (de) 2021-03-24
CN108243373B (zh) 2022-03-04
IT201600131334A1 (it) 2018-06-27

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