EP1843625B1 - Abgeschirmtes Mikrofon für ein mobiles Kommunikationsgerät - Google Patents

Abgeschirmtes Mikrofon für ein mobiles Kommunikationsgerät Download PDF

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Publication number
EP1843625B1
EP1843625B1 EP06112357A EP06112357A EP1843625B1 EP 1843625 B1 EP1843625 B1 EP 1843625B1 EP 06112357 A EP06112357 A EP 06112357A EP 06112357 A EP06112357 A EP 06112357A EP 1843625 B1 EP1843625 B1 EP 1843625B1
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EP
European Patent Office
Prior art keywords
microphone
circuit board
separator
shielding
electromagnetic shield
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.)
Active
Application number
EP06112357A
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English (en)
French (fr)
Other versions
EP1843625A1 (de
Inventor
Robert Phillips
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.)
BlackBerry Ltd
Original Assignee
Research in Motion Ltd
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 Research in Motion Ltd filed Critical Research in Motion Ltd
Priority to EP06112357A priority Critical patent/EP1843625B1/de
Priority to AT06112357T priority patent/ATE417478T1/de
Priority to DE602006004174T priority patent/DE602006004174D1/de
Priority to CA2583899A priority patent/CA2583899C/en
Publication of EP1843625A1 publication Critical patent/EP1843625A1/de
Application granted granted Critical
Publication of EP1843625B1 publication Critical patent/EP1843625B1/de
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces

Definitions

  • Mobile, handheld communications devices typically contain a miniature microphone such as an electret condenser microphone.
  • the microphone is typically held against a printed circuit board and electrically connects to the circuit board via a pair of small coil springs.
  • Such devices also typically have an antenna in close proximity to the microphone with the attendant possibility that the microphone can undesirably pick up, as noise, electromagnetic energy radiated by the antenna. In the case of mobile telephones, this undesirable noise is sometimes referred to in the industry as "GSM buzz".
  • GSM buzz To shield the microphone against such noise pick-up, a grounded shield (hereinafter alternatively referred to as an “electromagnetic shield”) is typically used to surround or enclose the microphone so as to isolate the microphone, electromagnetically, from such radiation.
  • a number of parts are stacked together and enclosed in a housing.
  • the stack of parts must, when fully assembled, occupy the space defined by the housing of the device.
  • the variability in the size of the parts in the stack and their proper placement during assembly requires that tolerances be factored into the design of the stack of parts.
  • the pressure between the various parts in the stack ultimately depends upon the aggregate size of the parts made to occupy the well-defined space. As excess pressure between the parts may cause undesirable strain and damage thereto, resilient parts capable of absorbing the stack pressure are typically included.
  • a shielded microphone assembly is preferably provided for use in a communications device having a circuit board and a housing and having an antenna or used proximate to an antenna.
  • the microphone is placed inside a conductive, electromagnetic shield (e.g. a shielding can) and a separator (e.g. an o-ring-type) is placed over the shield, forming an assembly configured to co-operate with the housing and the circuit board to electrically connect each of the microphone and the electromagnetic shield to the circuit board.
  • the device housing can then be stacked over the assembly, namely, over the shield to load the separator onto the shield and drive the shield directly against the circuit board, whereby the shield becomes grounded through an electrical connection with the circuit board.
  • the electromagnetic shield when formed as a shielding can, may have a lip whereby the shielding can electrically connects to the circuit board by means of the lip.
  • the separator preferably an electrical insulator
  • when formed as a resilient o-ring preferably surrounds an outside perimeter of the shielding can over the lip.
  • the separator when formed as a resilient disk, is preferably positioned over a ceiling of the shielding can, where the ceiling is configured to be positioned adjacent the housing upon the loading of the housing.
  • the electromagnetic shield may include an outlet for communication of sound waves to the microphone.
  • a further aspect of the invention preferably provides a mobile communications device comprising an antenna and a shielded microphone assembly according to the foregoing.
  • a still further aspect of the invention preferably provides a method of shielding a microphone in such a communications device whereby the microphone is shielded with a conductive, electromagnetic shield; a resilient separator is provided over the electromagnetic shield; and, the shielded microphone and separator are sandwiched between the housing and the circuit board.
  • the shielded microphone and separator are configured to co-operate with the housing and the circuit board to electrically connect each of the microphone and the electromagnetic shield to the circuit board, thereby grounding the electromagnetic shield.
  • the sandwiching produces a loading of the housing onto the separator and the electromagnetic shield onto the circuit board, thereby enclosing the microphone between the circuit board and the electromagnetic shield.
  • the shielded microphone assembly 10 can be used in any suitable communications device 20 having a circuit board 30 (see Fig. 2 ), which may be a printed circuit board, a housing 40 and, in a mobile communications device, an antenna (not shown).
  • the shielded microphone assembly 10 has an electromagnetic shield in the form of a shielding can 50, a microphone 60 and a separator 70.
  • the shielding can 50 is composed of a conductive material and is grounded through an electrical connection with an electrical ground contact of the circuit board 30.
  • the microphone 60 is contained within the enclosure 80 and when installed in a communications device is electrically connected with the circuit board 30.
  • the shielding can 50 and the microphone 60 may be any suitable shape such that the microphone 60 fits within the enclosure; accordingly, the cross-sectional shape of the shielding can 50 may be circular, square, hexagonal or any other suitable shape which co-operates with the shape of the microphone and circuit board.
  • the microphone 60 may be held against the circuit board 30 by the shielding can 50; alternatively, the microphone 60 may be soldered or otherwise affixed to the circuit board 30.
  • the shielding can 50 includes an outlet 90 or other means for communicating sound waves into the shielding can 50 and, thence, to the microphone 60.
  • the separator 70 which is made of a resilient material and may also be insulating (e.g. rubber), is positioned between the shielding can 50 and the housing 40. In this manner, the shielding can 50 shields the enclosed microphone 60 from electromagnetic energy, including electromagnetic energy from a proximate antenna, while the separator 70, being resilient, is springy and able to rebound from, and absorb, pressure between the housing 40 and the shielding can 50.
  • the separator 70 is an o-ring-type separator positioned over the shielding can 50 and apart from the circuit board 30, so as to surround the outside perimeter of the shielding can 50.
  • the shielding can 50 of this embodiment includes a lip 100 over which the separator 70 is positioned such that, when installed in a communications device by stacking these components with the housing 40 positioned there over and the circuit board 30 positioned there under, the lip 100 of the shielding can 50 is pressed into electrical contact with the circuit board 30. By this stacking, the separator 70 is sandwiched between the housing 40 and the lip 100, and the lip 100 is sandwiched between the separator 70 and the circuit board 30.
  • the separator 70 may be a resilient disk positioned over a shielding can 50 which does not include such a lip.
  • the ceiling (top) 55 of the shielding can 50 parallel to the housing 40 is sandwiched between the disk separator 70 and the circuit board 30.
  • the disk separator 70 is aligned over the shielding can 50 by means of an appropriately sized channel 110 formed in the housing 40.
  • the disk separator 70 may include a central aperture 57, as shown, aligned in the stack with the counterpart outlet 90 of the ceiling of the shielding can 50 for communication of sound waves to the microphone 60.
  • the challenges associated with the known methods of assembling a shielded microphone, as discussed above, are overcome by using the method described herein and illustrated by the flowchart of FIG. 4 .
  • the method 120 can be used for the production of any suitable communications device having a circuit board, which may be a printed circuit board, a housing and, for mobiles devices, an antenna.
  • the method 120 is used for assembling a shielded microphone 10 and mounting it onto a circuit board 30, wherein the shielded microphone assembly includes a shielding can 50 and a microphone 60.
  • the shielding can 50 includes means for communicating sound waves into the shielding can 50 to the microphone 60.
  • the shielding can 50 and the microphone 60 are mounted together, the microphone being placed within the shielding can, and positioned 130 on the circuit board 30 so that both the microphone and shielding are in electrical contact with the circuit board 30.
  • a resilient separator 70 is positioned 140 over the shielding can 50.
  • the housing 40 is stacked over and pressed onto 150 the separator 70 so as to load the separator 70, sandwiching it between the housing 40 and the shielding can 50.
  • the shielding can 50 is pressed against the circuit board 30, whereby the shielded microphone assembly becomes mounted on the circuit board 30.
  • the resilience of the separator 70 enables it to absorb (tolerate) the load placed on it by this stacking of the housing 40 onto the shielding can 50 and circuit board 30 there under.
  • the microphone 60 of the shielded microphone assembly may first be mounted onto the circuit board 30 (e.g. by soldering), followed by mounting of the shielding can 50 onto the circuit board 30 so as to cover the microphone 60.
  • the solutions described herein facilitate the manufacturing of such devices while at the same time reducing the overall cost of parts.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Transmitters (AREA)
  • Transceivers (AREA)

Claims (18)

  1. Eine abgeschirmte Mikrofoneinheit (10), bestehend aus einem Mikrofon (60) und einer leitenden, elektromagnetischen Abschirmung (50), für die Verwendung in einem Kommunikationsgerät (20), das eine Leiterplatte (30) und ein Gehäuse (40) aufweist und sich bei der Verwendung in unmittelbarer Nähe einer Antenne befindet, gekennzeichnet durch ein elastisches Trennelement (70) über der elektromagnetischen Abschirmung (50), wobei sich die leitende, elektromagnetische Abschirmung (50) über dem Mikrofon (60) befindet und die Einheit (10) so eingerichtet ist, dass sie mit dem Gehäuse (40) und der Leiterplatte (30) zusammenwirkt, um das Mikrofon (60) und die elektromagnetische Abschirmung (50) jeweils elektrisch mit der Leiterplatte (30) zu verbinden, wenn das Gehäuse (40) auf das Trennelement (70) und die elektromagnetische Abschirmung (50) auf die Leiterplatte (30) aufgesetzt wird, sodass das Mikrofon (60) zwischen der Leiterplatte (30) und der elektromagnetischen Abschirmung (50) eingeschlossen und die elektromagnetische Abschirmung (50) geerdet wird.
  2. Eine abgeschirmte Mikrofoneinheit (10) gemäß Anspruch 1, bei der die elektromagnetische Abschirmung (50) als Abschirmbecher mit einer Umrandung (100) ausgebildet wird, wobei die Abschirmung mittels der Umrandung (100) elektrisch mit der Leiterplatte (30) verbunden werden kann.
  3. Eine abgeschirmte Mikrofoneinheit (10) gemäß Anspruch 2, bei der das Trennelement (70) ein elastischer O-Ring ist, der einen äußeren Umfang des Abschirmbechers über der Umrandung (100) umgibt.
  4. Eine abgeschirmte Mikrofoneinheit (10) gemäß Anspruch 1, bei der die elektromagnetische Abschirmung (50) als Abschirmbecher ausgebildet wird und das Trennelement (70) eine elastische Scheibe ist, die über einer oberen Begrenzung (55) des Abschirmbechers positioniert wird, wobei die obere Begrenzung (55) so eingerichtet ist, dass sie nach dem Aufsetzen des Gehäuses (40) neben dem Gehäuse (40) positioniert wird.
  5. Eine abgeschirmte Mikrofoneinheit (10) gemäß Anspruch 4, bei der die Scheibe nach dem Aufsetzen des Gehäuses (40) mittels eines im Gehäuse (40) ausgebildeten Kanals (110) über dem Abschirmbecher ausgerichtet wird.
  6. Eine abgeschirmte Mikrofoneinheit (10) gemäß einem der vorangehenden Ansprüche, bei der das Trennelement (70) ein elektrisch isolierendes Material umfasst.
  7. Eine abgeschirmte Mikrofoneinheit (10) gemäß einem der vorangehenden Ansprüche, bei der die Leiterplatte (30) eine gedruckte Leiterplatte ist.
  8. Eine abgeschirmte Mikrofoneinheit (10) gemäß einem der vorangehenden Ansprüche, bei der die elektromagnetische Abschirmung (50) einen Ausgang (90) zur Übermittlung von Schallwellen an das Mikrofon (60) umfasst.
  9. Eine abgeschirmte Mikrofoneinheit (10) gemäß Anspruch 4 oder Anspruch 5, bei der die Scheibe eine mittige Öffnung (57) zur Übermittlung von Schallwellen an das Mikrofon (60) umfasst.
  10. Ein mobiles Kommunikationsgerät (20), das eine Antenne und eine abgeschirmte Mikrofoneinheit (10) gemäß einem der Ansprüche 1 bis 9 umfasst.
  11. Ein Verfahren zum Abschirmen eines Mikrofons (60) in einem Kommunikationsgerät (20), das eine Leiterplatte (30) und ein Gehäuse (40) aufweist, wobei das Gerät (20) mit einer Antenne entweder als Teil des Geräts (20) oder in unmittelbarer Nähe des Geräts (20) verwendet wird, wobei das Verfahren das Abschirmen des Mikrofons (60) mit einer leitenden, elektromagnetischen Abschirmung (50) über dem Mikrofon (60) umfasst und durch die folgenden Schritte gekennzeichnet ist:
    das Bereitstellen eines elastischen Trennelements (70) über der magnetischen Abschirmung (50); und
    das Zwischenschichten des abgeschirmten Mikrofons und des Trennelements (70) zwischen dem Gehäuse (40) und der Leiterplatte (30);
    wobei das abgeschirmte Mikrofon und das Trennelement (70) so eingerichtet sind, dass sie mit dem Gehäuse (40) und der Leiterplatte (30) zusammenwirken, um das Mikrofon (60) und die elektromagnetische Abschirmung (50) jeweils mit der Leiterplatte (30) zu verbinden, wobei die elektromagnetische Abschirmung (50) hierdurch geerdet wird, wobei durch das Zwischenschichten ein Aufsetzen des Gehäuses (40) auf das Trennelement (70) und der elektromagnetischen Abschirmung (50) auf die Leiterplatte (30) herbeigeführt wird, wodurch das Mikrofon (60) zwischen der Leiterplatte (30) und der elektromagnetischen Abschirmung (50) eingeschlossen wird.
  12. Ein Verfahren gemäß Anspruch 11, bei dem die elektromagnetische Abschirmung (50) als Abschirmbecher mit einer Umrandung (100) ausgebildet wird, wobei die Abschirmung mittels der Umrandung (100) elektrisch mit der Leiterplatte (30) verbunden werden kann.
  13. Ein Verfahren gemäß Anspruch 12, bei dem das Trennelement (70) ein elastischer O-Ring ist, der zum Umgeben eines äußeren Umfangs des Abschirmbechers bereitgestellt wird.
  14. Ein Verfahren gemäß Anspruch 11, bei dem die elektromagnetische Abschirmung (50) als Abschirmbecher ausgebildet wird und das Trennelement (70) eine elastische Scheibe ist, die über einer oberen Begrenzung (55) des Abschirmbechers bereitgestellt wird, wobei die obere Begrenzung (55) nach dem Aufsetzen des Gehäuses (40) neben dem Gehäuse (40) positioniert wird.
  15. Ein Verfahren gemäß einem der Ansprüche 11 bis 14, bei dem das Trennelement (70) ein elektrisch isolierendes Material umfasst.
  16. Ein Verfahren gemäß einem der Ansprüche 11 bis 15, bei dem die elektromagnetische Abschirmung (50) einen Ausgang (90) zur Übermittlung von Schallwellen an das Mikrofon (60) umfasst.
  17. Ein Verfahren gemäß einem der Ansprüche 11 bis 16, bei dem das Mikrofon (60) an der Leiterplatte (30) befestigt ist und die Leiterplatte (30) eine gedruckte Leiterplatte ist.
  18. Ein Verfahren gemäß einem der Ansprüche 11 bis 17, bei dem das Mikrofon (60) durch die elektromagnetische Abschirmung (50) auf der Leiterplatte (30) festgehalten wird.
EP06112357A 2006-04-07 2006-04-07 Abgeschirmtes Mikrofon für ein mobiles Kommunikationsgerät Active EP1843625B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP06112357A EP1843625B1 (de) 2006-04-07 2006-04-07 Abgeschirmtes Mikrofon für ein mobiles Kommunikationsgerät
AT06112357T ATE417478T1 (de) 2006-04-07 2006-04-07 Abgeschirmtes mikrofon für ein mobiles kommunikationsgerät
DE602006004174T DE602006004174D1 (de) 2006-04-07 2006-04-07 Abgeschirmtes Mikrofon für ein mobiles Kommunikationsgerät
CA2583899A CA2583899C (en) 2006-04-07 2007-04-04 Shielded microphone for mobile communications device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06112357A EP1843625B1 (de) 2006-04-07 2006-04-07 Abgeschirmtes Mikrofon für ein mobiles Kommunikationsgerät

Publications (2)

Publication Number Publication Date
EP1843625A1 EP1843625A1 (de) 2007-10-10
EP1843625B1 true EP1843625B1 (de) 2008-12-10

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EP06112357A Active EP1843625B1 (de) 2006-04-07 2006-04-07 Abgeschirmtes Mikrofon für ein mobiles Kommunikationsgerät

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EP (1) EP1843625B1 (de)
AT (1) ATE417478T1 (de)
CA (1) CA2583899C (de)
DE (1) DE602006004174D1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115498463B (zh) * 2022-11-18 2023-02-03 深圳市西点精工技术有限公司 一种电磁屏蔽复合组件及高速背板连接器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2809939B2 (ja) * 1992-08-26 1998-10-15 松下電器産業株式会社 マイクロホン装置
FI970409A7 (fi) * 1997-01-31 1998-08-01 Nokia Corp Menetelmä mikrofonin suojaamiseksi ulkoisilta häiriötekijäiltä ja mikrofonin häiriösuojus
US5937361A (en) * 1997-05-09 1999-08-10 Ericsson Inc. Radiotelephones with shielded microphones
US7398072B2 (en) * 2004-08-31 2008-07-08 Research In Motion Limited Mobile wireless communications device with reduced microphone noise from radio frequency communications circuitry

Also Published As

Publication number Publication date
ATE417478T1 (de) 2008-12-15
CA2583899C (en) 2011-03-08
EP1843625A1 (de) 2007-10-10
CA2583899A1 (en) 2007-10-07
DE602006004174D1 (de) 2009-01-22

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