WO2015071006A1 - Leiterplatte für die montage eines mikrofonbauteils und mikrofonmodul mit einer derartigen leiterplatte - Google Patents
Leiterplatte für die montage eines mikrofonbauteils und mikrofonmodul mit einer derartigen leiterplatte Download PDFInfo
- Publication number
- WO2015071006A1 WO2015071006A1 PCT/EP2014/069393 EP2014069393W WO2015071006A1 WO 2015071006 A1 WO2015071006 A1 WO 2015071006A1 EP 2014069393 W EP2014069393 W EP 2014069393W WO 2015071006 A1 WO2015071006 A1 WO 2015071006A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit board
- microphone
- printed circuit
- microphone component
- component
- Prior art date
Links
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
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/04—Structural association of microphone with electric circuitry therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/006—Interconnection of transducer parts
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0296—Conductive pattern lay-out details not covered by sub groups H05K1/02 - H05K1/0295
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/111—Pads for surface mounting, e.g. lay-out
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/003—Mems transducers or their use
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09009—Substrate related
- H05K2201/09072—Hole or recess under component or special relationship between hole and component
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10083—Electromechanical or electro-acoustic component, e.g. microphone
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- CONDUCTOR PLATE FOR ASSEMBLING A MICROPHONE COMPONENT AND MICROPHONE MODULE WITH SUCH A CONDUCTOR PLATE
- the invention relates to a printed circuit board for the 2nd-level mounting of a
- Microphone component In at least one surface of this printed circuit board at least one connection opening is formed, which opens into a cavity in the layer structure of the printed circuit board.
- the invention relates to a microphone module with such a printed circuit board.
- a circuit board and a microphone module of the type in question will be
- both connection openings serves as a sound inlet opening, while over the
- Channels are here designed so that it forms an acoustic waveguide or resonator for sound waves of a certain frequency range, in particular for voice signals. This should be a particularly good sound on the
- Microphone component can be achieved.
- the microphone components which are to be used in the context of the invention in question here are at least one MEMS microphone component
- the assembly and connection technology (AVT) of these components is for assembly designed on a circuit board.
- AVT connection technology
- these components of such a microphone component can be arranged and wired in the context of 1 st-level mounting in a common housing. However, they can also be combined in a package with a PCB carrier or at wafer level.
- the microphone sensitivity of such components depends essentially on the size of the back volume behind the microphone diaphragm of the microphone component. This back volume is usually used in the I st-level assembly of the
- Microphone component so in its packaging included. Accordingly, the type of packaging determines and limits the size of the back volume of the microphone component.
- the present invention proposes measures by means of which the back volume of a microphone component can be realized independently of its packaging. These measures allow a reduction in the size of the microphone component without sacrificing the
- a cavity in the layer structure of the circuit board for the 2nd-level mounting of the microphone component is used as a backside volume. This cavity is closed except for the connection opening for the microphone component and the circuit board surface with the connection opening is configured for a sealing mounting of the microphone component above the connection opening.
- the back volume for a microphone component is shifted from the component to the second level printed circuit board. Since the size of the back volume is no longer limited by the structure of the microphone component, the
- Microphone component can be packed much more space-saving.
- Microphone component and the microphone component contributes.
- several components and assemblies with complementary functions are combined to form a functional module on a circuit board of the type in question here. Accordingly, the dimensions of such a printed circuit board are usually significantly larger than the "footprint" of the microphone component.
- the microphone sensitivity can be increased in this case simply by the fact that the cavity in the printed circuit board laterally extends at least in regions beyond the dimensions of the microphone component.
- wall webs and / or support columns are formed within the cavity in the 2nd level printed circuit board. Such structural elements increase the stability of the circuit board and simplify their manufacture.
- the oscillation of resonant internal vibrations of the cavity can be avoided.
- the natural mode modes can be shifted by these measures to higher frequencies, ideally so far that the resonant frequency of the cavity is above the highest useful frequency of the microphone component and in particular above 80kHz.
- the microphone components used in the context of the present invention may be constructed or packaged differently.
- the MEMS microphone component is arranged in a housing in which at least two sound-transparent openings are formed, namely at least one sound inlet opening and at least one mounting-side connection opening. In this case, one side of the
- Microphone structure of the MEMS microphone component via the sound inlet opening in the housing with sound pressure is applied, while the other side of the microphone structure is connected via the connection opening in the housing and the connection opening in the circuit board to the cavity in the circuit board.
- the microphone component is realized in the form of a package with a mounting support for the MEMS microphone component.
- the sound is introduced here via the side facing away from the mounting bracket of the microphone structure, while the other side of the Microphone structure via a through hole in the mounting bracket and the connection opening in the circuit board is connected to the cavity in the circuit board.
- a microphone component in the form of a wafer level package is used.
- the package with a MEMS microphone component is mounted directly above the connection opening in the printed circuit board. Again, the sound is introduced via the side facing away from the circuit board of the microphone structure, while the other side of the microphone structure is connected directly to the connection opening in the circuit board and so to the cavity in the circuit board.
- Equally essential to all embodiments of the invention is that there is an acoustically tight connection between the microphone component and the printed circuit board.
- This is preferably realized in the form of at least one closed sealing ring on the circumference of the connection opening in the printed circuit board and / or in the form of a circumferentially closed sealing ring in the edge region of the mounting surface of the microphone component.
- the compound itself can be easily realized in the form of a solder joint or an adhesive bond.
- FIGS. Fig. 1 a shows a schematic sectional view of a microphone module
- FIG. 1b illustrates the layout of the printed circuit board 10 with reference to a schematic plan view.
- 2 and 3 each show a construction variant of a microphone module according to the invention in a schematic sectional representation.
- the microphone module 100 shown in FIG. 1 a comprises a microphone component 20 which has been mounted on a printed circuit board 10 in the context of the 2nd level mounting.
- a 2nd-level printed circuit board 10 serves as a carrier and interconnection level for a plurality of components with different, complementary functions, which are combined in one module.
- both mounting surfaces for the mechanical fixation of the components created as well as pads and traces for the electrical contacting and interconnection of the components can then be used as a prefabricated module with a certain range of functions in different applications.
- the circuit board 10 in question here is specially configured for mounting a microphone component 20.
- a closed cavity 11 is formed in the layer structure of this printed circuit board 10, which has only one connection opening 12 in the upper side of the printed circuit board 10.
- the microphone component 20 is mounted airtight over the connection opening 12, so that the cavity 11 is acoustically connected to the rear side volume of the microphone component 20.
- wall webs 13 and support pillars 14 are formed within the cavity 11, so that the resonant frequency of the cavity 1 1 is above the highest useful frequency of the microphone component 20 and in particular above 80 kHz.
- the cavity 11 extends within the printed circuit board 10 to beyond the dimensions, i. the base, the microphone component 20 addition.
- the expansion of the cavity 11 and the arrangement of the wall webs 13 and support columns 14 and also the layout of the circuit board upper side with mounting surfaces 15 and connection pads 16 is illustrated in particular by Fig. 1 b.
- the microphone component 20 of the microphone module 100 is a
- MEMS microphone component 21 with a housing that consists of a bottom part 22 and a lid part 24.
- the microphone structure 1 with acoustically active diaphragm and fixed counter element is formed in the front side of the MEMS microphone component 21 and spans an opening 2 in the component rear side.
- the housing bottom part 22 is a 1 st-level printed circuit board with a through hole 23.
- the MEMS microphone component 21 is above this
- the cap-like cover part 24 is disposed above the MEMS microphone component 21 on the bottom part 22 and connected to this circumferentially. Also in the cover part 24, a sound-transparent opening 25 is formed.
- the microphone component 20 is mounted on the 2nd-level printed circuit board 10 such that the through-opening 23 in the housing bottom part 22 is positioned in alignment with the connection opening 12 on the printed circuit board 10. Between the annular mounting surface 15 in the edge region of the connection opening 12 on the circuit board 10 and the housing bottom part 22 is a circumferential air-tight connection 30, so that the one side of the microphone structure 1 via the passage opening 23 in
- Housing bottom part 22 and the connection opening 12 in the circuit board 10 to the cavity 1 1 is connected within the circuit board 10.
- Lid portion 24 serves as a sound inlet opening, via which the other side of the microphone structure 1 of the MEMS microphone component 21 is acted upon by sound pressure.
- sealing ring connection can be provided which, in addition to the acoustic connection 23, 12, also encloses the electrical contact connections 31 and thus against environmental influences, such as moisture and pollution, protects.
- connection 30 between the microphone component 20 and the 2nd-level printed circuit board 10 and also for the electrical contact 31 of the microphone component 20 are suitable, for example
- Lot or electrically conductive adhesive which in a screen printing process the PCB surface can be applied.
- electrically conductive adhesive which in a screen printing process the PCB surface can be applied.
- different materials such as a non-conductive adhesive for the mechanical connection and copper pillars for electrical contacting.
- the microphone modules 200 and 300 shown in FIGS. 2 and 3 each include a microphone component 220 and 320 mounted on a 2nd level circuit board 10.
- a sealed cavity 11 is formed with only one connection opening 12 in the top of the circuit board 10 within the circuit board 10.
- the second-level printed circuit board 10 here consists of at least two spaced-apart layers of an electrically insulating carrier material, which are connected via a frame-like structured intermediate layer.
- the microphone component 220 or 320 is sealingly mounted over the connection opening 12 in the upper layer of the printed circuit board 10, in such a way that the cavity 11 to the backside volume of the
- Microphone component 220 or 320 is connected. Accordingly, the cavity 11 within the 2nd level circuit board 10 contributes to the backside volume of the microphone component 220 or 320, respectively. In both embodiments, the cavity 1 1 extends over the dimensions, i. the base surface of the microphone component 220 or 320 addition. This way, within the
- the microphone components 220 and 320 both comprise a MEMS microphone component 21 with a microphone structure 1 which is formed in the component front side and spans an opening 2 in the component rear side, they differ in the packaging of this microphone component 21 2 microphone component 220 - in contrast to
- the microphone component 220 has been implemented in stack form, so that its base area corresponds to the chip area of the MEMS microphone component 21.
- the MEMS microphone component 21 was mounted face-down on a mounting support 222 with a through-opening 223, in such a way that the Through opening 223 forms an acoustic connection to the microphone structure 1 of the MEMS microphone component 21.
- the back side of the MEMS microphone component 21 has been provided with a protective membrane 240. This spans the back opening 2 without locking it acoustically.
- a mounting support 222 here is a 1 st-level circuit board, which also as
- Subcarrier for mounting on the 2nd-level circuit board 10 acts. Accordingly, the electrical contacts 3 of the MEMS microphone component 21 are guided by the surface of the MEMS microphone component 21 through the mounting bracket 222. In addition, here an evaluation ASIC 4 is embedded in the mounting carrier 222.
- the microphone component 220 is mounted on the 2nd level printed circuit board 10 such that the through opening 223 in the mounting bracket 222 is positioned in alignment with the connection opening 12 on the printed circuit board 10. Between the annular mounting surface in the edge region of the connection opening 12 on the printed circuit board 10 and the mounting bracket 222 is a circumferential airtight connection 30, so that the one side of the microphone structure 1 via the through hole 223 in the mounting bracket 222 and the connection opening 12 in the circuit board 10 at the cavity 11 is connected within the circuit board 10. The sound absorption of the microphone structure 1 takes place here via the protective membrane 240 and the opening 2 in the rear side of the MEMS microphone component 21.
- contact connections 31, ie electrical connections, have been made here as well during the assembly of the microphone component 220 on the second-level printed circuit board 10 in addition to the sealing connection 30
- the MEMS microphone device 21 was provided with only a rear acoustically permeable protective membrane 340 and then mounted directly on the 2nd level circuit board 10.
- the microphone structure 1 was arranged face-down over the connection opening 12 in the circuit board surface. Between the annular mounting surface in the edge region of the connection opening 12 on the circuit board 10 and the top of the MEMS microphone component 21 is a circumferential air-tight connection 30, so that the one side of the microphone structure 1 on the
- Connection opening 12 in the circuit board 10 acoustically to the cavity 11 inside half of the circuit board 10 is connected.
- an electrically conductive connection material such as solder, was used, so that the microphone component 320 and the MEMS
- Microphone component via the mechanically sealed connection 30 is also electrically connected to the 2nd-level circuit board 10.
- Level PCB allow a simplification and a significant reduction of the component structure, regardless of the size of the back volume and thus independent of the microphone performance.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Manufacturing & Machinery (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201480062511.4A CN105993207B (zh) | 2013-11-15 | 2014-09-11 | 用于装配麦克风构件的电路板和具有这种电路板的麦克风模块 |
KR1020167015644A KR20160086383A (ko) | 2013-11-15 | 2014-09-11 | 마이크로폰 부품을 장착하기 위한 인쇄 회로 기판 및 이와 같은 인쇄 회로 기판을 구비하는 마이크로폰 모듈 |
US15/036,678 US10051355B2 (en) | 2013-11-15 | 2014-09-11 | Circuit board for a microphone component part, and microphone module having such a circuit board |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013223359.0 | 2013-11-15 | ||
DE102013223359.0A DE102013223359A1 (de) | 2013-11-15 | 2013-11-15 | Leiterplatte für die 2nd-Level-Montage eines Mikrofonbauteils und Mikrofonmodul mit einer derartigen Leiterplatte |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015071006A1 true WO2015071006A1 (de) | 2015-05-21 |
Family
ID=51542359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/069393 WO2015071006A1 (de) | 2013-11-15 | 2014-09-11 | Leiterplatte für die montage eines mikrofonbauteils und mikrofonmodul mit einer derartigen leiterplatte |
Country Status (6)
Country | Link |
---|---|
US (1) | US10051355B2 (de) |
KR (1) | KR20160086383A (de) |
CN (1) | CN105993207B (de) |
DE (1) | DE102013223359A1 (de) |
TW (1) | TWI646876B (de) |
WO (1) | WO2015071006A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3169082A1 (de) * | 2015-10-20 | 2017-05-17 | Sonion Nederland B.V. | Mikrofonanordnung mit unterdrücktem frequenzgang |
US9878904B1 (en) * | 2016-10-25 | 2018-01-30 | Rosemount Aerospace Inc. | MEMS sensor with electronics integration |
WO2019134146A1 (zh) * | 2018-01-05 | 2019-07-11 | 深圳市沃特沃德股份有限公司 | 语音采集装置和家电设备 |
TWM574274U (zh) * | 2018-08-20 | 2019-02-11 | 和碩聯合科技股份有限公司 | 收音電子裝置及其收音結構 |
CN114885534B (zh) * | 2021-02-05 | 2024-05-28 | 深圳富泰宏精密工业有限公司 | 电子装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5870482A (en) * | 1997-02-25 | 1999-02-09 | Knowles Electronics, Inc. | Miniature silicon condenser microphone |
WO2002045463A2 (en) * | 2000-11-28 | 2002-06-06 | Knowles Electronics, Llc | Miniature silicon condenser microphone and method for producing same |
US20080157301A1 (en) * | 2007-01-03 | 2008-07-03 | Stats Chippac, Inc. | Leadframe package for mems microphone assembly |
US20120027241A1 (en) * | 2010-07-30 | 2012-02-02 | Turnbull Robert R | Vehicular directional microphone assembly for preventing airflow encounter |
US20120177229A1 (en) * | 2011-01-12 | 2012-07-12 | Research In Motion Limited | Printed circuit board with an acoustic channel for a microphone |
EP2552124A1 (de) * | 2010-06-01 | 2013-01-30 | Funai Electric Co., Ltd. | Substrat mit einem darauf montierten elektroakustischen wandlerelement, mikrofoneinheit und herstellungsverfahren dafür |
EP2592844A1 (de) * | 2010-08-02 | 2013-05-15 | Funai Electric Co., Ltd. | Mikrofoneinheit |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0126783A1 (de) * | 1983-05-25 | 1984-12-05 | Head Stereo GmbH , Kopfbezogene Aufnahme- und Wiedergabetechnik & Co. Messtechnik KG | Ein breitbandiger rauscharmer Kunstkopf mit hoher Dynamik und der Eigenschaft der originalgetreuen Übertragung von Hörereignissen |
US4741035A (en) * | 1983-06-01 | 1988-04-26 | Head Stereo Gmbh | Wide band, low noise artificial head for transmission of aural phenomena |
DE102006042855B4 (de) * | 2006-09-13 | 2016-01-14 | Sennheiser Electronic Gmbh & Co. Kg | Kondensatormikrofon |
TWI370101B (en) * | 2007-05-15 | 2012-08-11 | Ind Tech Res Inst | Package and packaging assembly of microelectromechanical sysyem microphone |
US8102015B2 (en) * | 2008-10-02 | 2012-01-24 | Fortemedia, Inc. | Microphone package with minimum footprint size and thickness |
DE102010040370B4 (de) * | 2010-09-08 | 2016-10-06 | Robert Bosch Gmbh | MEMS-Mikrofon-Package |
-
2013
- 2013-11-15 DE DE102013223359.0A patent/DE102013223359A1/de not_active Withdrawn
-
2014
- 2014-09-11 US US15/036,678 patent/US10051355B2/en not_active Expired - Fee Related
- 2014-09-11 WO PCT/EP2014/069393 patent/WO2015071006A1/de active Application Filing
- 2014-09-11 CN CN201480062511.4A patent/CN105993207B/zh not_active Expired - Fee Related
- 2014-09-11 KR KR1020167015644A patent/KR20160086383A/ko not_active Application Discontinuation
- 2014-11-13 TW TW103139319A patent/TWI646876B/zh not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5870482A (en) * | 1997-02-25 | 1999-02-09 | Knowles Electronics, Inc. | Miniature silicon condenser microphone |
WO2002045463A2 (en) * | 2000-11-28 | 2002-06-06 | Knowles Electronics, Llc | Miniature silicon condenser microphone and method for producing same |
US20080157301A1 (en) * | 2007-01-03 | 2008-07-03 | Stats Chippac, Inc. | Leadframe package for mems microphone assembly |
EP2552124A1 (de) * | 2010-06-01 | 2013-01-30 | Funai Electric Co., Ltd. | Substrat mit einem darauf montierten elektroakustischen wandlerelement, mikrofoneinheit und herstellungsverfahren dafür |
US20120027241A1 (en) * | 2010-07-30 | 2012-02-02 | Turnbull Robert R | Vehicular directional microphone assembly for preventing airflow encounter |
EP2592844A1 (de) * | 2010-08-02 | 2013-05-15 | Funai Electric Co., Ltd. | Mikrofoneinheit |
US20120177229A1 (en) * | 2011-01-12 | 2012-07-12 | Research In Motion Limited | Printed circuit board with an acoustic channel for a microphone |
Also Published As
Publication number | Publication date |
---|---|
TW201532486A (zh) | 2015-08-16 |
CN105993207A (zh) | 2016-10-05 |
TWI646876B (zh) | 2019-01-01 |
US20160295310A1 (en) | 2016-10-06 |
CN105993207B (zh) | 2019-10-18 |
KR20160086383A (ko) | 2016-07-19 |
DE102013223359A1 (de) | 2015-05-21 |
US10051355B2 (en) | 2018-08-14 |
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