EP1259096A2 - Isolation interne d' une capsule électroacoustique - Google Patents

Isolation interne d' une capsule électroacoustique Download PDF

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Publication number
EP1259096A2
EP1259096A2 EP02450092A EP02450092A EP1259096A2 EP 1259096 A2 EP1259096 A2 EP 1259096A2 EP 02450092 A EP02450092 A EP 02450092A EP 02450092 A EP02450092 A EP 02450092A EP 1259096 A2 EP1259096 A2 EP 1259096A2
Authority
EP
European Patent Office
Prior art keywords
capsule
microphone
teflon
electrode
capsule housing
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.)
Withdrawn
Application number
EP02450092A
Other languages
German (de)
English (en)
Inventor
Gino Dipl.-Ing. Pavlovic
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.)
AKG Acoustics GmbH
Original Assignee
AKG Acoustics 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 AKG Acoustics GmbH filed Critical AKG Acoustics GmbH
Publication of EP1259096A2 publication Critical patent/EP1259096A2/fr
Withdrawn legal-status Critical Current

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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
    • H04R19/00—Electrostatic transducers
    • H04R19/04—Microphones

Definitions

  • the invention relates to electro-acoustic transducers working on an electrostatic basis work as a sound pickup and are housed in a microphone capsule. Such Regardless of their physical mode of operation, transducers have a membrane, which is exposed to the sound field and is excited to vibrate by it.
  • the object of the invention is thus an electrostatic microphone.
  • the electrodes of the electrostatic transducers are an elastic, tensioned membrane and one rigid electrode, which is usually only called the electrode. They both form a capacitor whose electrical capacity changes due to pressure fluctuations in the sound field. There is an electric field between the electrodes of the electrostatic converter is built, it is possible to change the capacity of the converter with the help of a convert downstream amplifier into electrical voltage changes.
  • Electrostatic capsules can vary in terms of how the electrical is applied Field between their electrodes can be divided into two groups:
  • Condenser capsules that contain the charges that cause the electric field With the help of an externally applied voltage (polarization voltage): Condenser capsules.
  • Electrostatic capsules where the electrical charge on the electrode or Membrane is "frozen", making an externally applied voltage obsolete: Electret.
  • Microphone capsules that are used as electrostatic transducers in microphone construction, can be divided into the capsule housing and capsule interior from a structural point of view.
  • the Capsule housing can either be made of an electrically insulating material (plastic) or be made of an electrically conductive material (metal).
  • the task of It is the capsule housing that, on the one hand, mechanically integrates the components inside the capsule as one unit unite and protect, on the other hand electromagnetic interference from the inside of the capsule keep away.
  • Each of the two groups of materials has its advantages and disadvantages.
  • plastic capsule housing The advantages of a plastic capsule housing are in its relatively simple Given the way of production, which also results in very complicated design variants Allows the use of a plastic injection mold once it has been produced.
  • the disadvantage is the inability of a plastic to withstand electromagnetic interference to shield. Therefore, plastic microphone capsules are only in a microphone housing or built-in device made of metal, providing protection against electromagnetic interference is taken over by the device itself.
  • the microphone capsules increasingly in telecommunications devices (mobile and Wireless telephones) with plastic housings play a role in the type of execution of the microphone capsule housing for the electromagnetic compatibility of the device essential role. That is why such devices come with no metal housing exhibit, only the use of microphone capsules with metal housing in question.
  • the electrical conductivity of the capsule housing is desirable, but the electrical Conductivity on the inside is a major disadvantage.
  • the disadvantage is that The fact that the microphone capsule is a voltage source dependent on sound pressure is designed with a very high internal (electrical) resistance. So everyone has to inner components of the microphone capsule from each other and from the inner wall of the Capsule housing are electrically very well insulated.
  • the invention has set itself the task of the microphone capsule housing made of metal improve so that they no longer have the disadvantages mentioned, but at the same time are inexpensive and reliable to manufacture.
  • the invention is characterized in that one for the production of Microphone capsule housing as a starting material at least on one side with Teflon coated sheet metal used.
  • the (or a) coated side of the sheet is in the Thermoformed tool inserted so that it forms the inside of the capsule housing. This is it is possible to approach the insulation pots or insulation strips described above dispense and get a very reliable electrical insulation without a own component must be used and without a separate manufacturing step.
  • the end face of the invention Microphone capsule pot used as a rigid capsule electrode, leading to further Simplification, miniaturization and cheaper overall microphone results.
  • the electrostatic converters have two electrodes.
  • the the membrane is movable and the immobile is simply called the electrode and is usually inside the microphone capsule.
  • the design of the invention provides now that the end face, also called the front, the outside of metal and the inside of the Teflon coating, as Electrode
  • miniaturized capsules can be created in particular which the possibility of dispensing with a separate component - the electrode - what a valuable saving in space and costs.
  • Fig. 1 shows a capsule of an electroacoustic transducer after the electrostatic Principle with a metal housing according to the prior art.
  • the capsule housing 1 usually consists of aluminum sheet and is by means of a Thermoforming process. It has a sound inlet opening 2, which is usually has been punched out in the deep-drawing step, through which the sound is unimpeded and direct can meet the membrane 4.
  • the capsule housing 1 is by means of a Teflon ring or Teflon strip 3 electrically isolated from the components inside the capsule housing. This prevents the individual components of the electrostatic converter from Contact with the capsule housing 1 come to the same potential.
  • the membrane 4 is glued to a membrane ring 5, the distance between the Membrane 4 and the (rigid) electrode 6 are secured by means of a spacer ring 7.
  • the electrode 6 has openings, like the other components following it axially, to allow sound to enter membrane 4 from this side and so on on the one hand to correctly tune the frequency characteristics of the capsule as a whole, on the other hand to come to the intended coordination of the directional characteristic.
  • the electrode 6 is located behind (always in the direction of the main sound system) a so-called acoustic friction pill 8. It is made in a plastic injection molding process manufactured and has at least one opening, which with a porous material 9th is closed or covered. This material mostly consists of open-pore foamed polyurethane. By coordinating their geometric dimensions and the Air permeability size, the above objectives are achieved.
  • the capsule is on its lower side by an electrical component print 10 locked.
  • the print carries a high-resistance circuit for converting the signals of the pair of electrodes with high impedance.
  • the print 10 also has a sound permeable Opening up as mentioned above.
  • FIG. 2 shows a capsule constructed according to the invention.
  • the invention Difference from the prior art, as shown in Fig. 1, lies in the absence of Teflon ring. This waiver is made possible by the fact that according to the invention Capsule housing 11 is covered or coated with a Teflon layer 12.
  • Sheets laminated with a thin layer of Teflon (10 ⁇ m to 50 ⁇ m thick) are worldwide commercially available and their provision is no problem for the specialist.
  • a possible one The source of supply is SUMITOMO.
  • This composite material is used in the prior art for Manufacture of the electrode used for electrostatic microphones or loudspeakers, whereby suitable openings punched into this raw material by the respective device manufacturer and the outer contour of the electrode by a punching process is created. In the prior art, such a material is found, for example, as Electrode 6, as shown in Fig. 1, use.
  • this material is now molded in a deep-drawing process brought the capsule housing 11, wherein in the case shown the one-sided coating the Teflon material 12 must come to rest on the inside. It is only necessary to do that insert sheet metal coated on one side "correctly" into the deep-drawing mold. In case of Use of a sheet coated on both sides must be oriented are of course not respected.
  • the remaining structure of a microphone according to the invention corresponds to that in FIG. 1 shown microphone, only that dispenses with the expensive Teflon strips or Teflon pot can be, which leads to a significant cost reduction. It also happens that by eliminating the Teflon strip, which is part of the automatic production process high clock rate must remain manageable (inherently stable) and therefore over a noticeable thickness has, the entire capsule housing can be made significantly smaller than it according to the state of the art was possible.
  • FIG. 3 A preferred embodiment of the invention, by the still essential Advantages achieved are shown in FIG. 3: This development of the invention enables the electrode 6 (FIG. 1) to be replaced by the inside of the capsule front 36.
  • the capsule housing 31 is, as stated above, laminated with a Teflon layer 32 and thereby able to take on the role of the electrode.
  • the further capsule structure is as follows: A spacer ring 33 holds the membrane 34, which like in the prior art, is glued to a membrane ring 35 at a distance from the Inside of the capsule front, which is the electrode. The rest of the structure corresponds the structure discussed with reference to FIG. 1.
  • the invention is not limited to the illustrated embodiment, but can be modified and changed in various ways. So it is possible the capsule housing 11, 31 made of double-sided coated aluminum sheet (or other sheet or electrically conductive material) if, for example, the capsule exterior should remain galvanically isolated from the environment. Even the use of others thermoformable metal instead of aluminum is conceivable, albeit for cost reasons and technological reasons (best suitability for deep drawing processes) the use of Aluminum is preferred.
  • a friction pill as a separate component to be provided, in particular if the capsule housing is installed at one point on a device on which the capsule holder takes over tasks of the acoustic friction pill can, it is possible to do without this friction cap. Similarly, the The task of the component print 10 can be taken from a print of the device on which the capsule is mounted almost directly.
  • the invention can be used both for electret capsules and for capacitor capsules be used, there is no constructive difference, it is only in in the first case the charges are permanently applied to the electrode or membrane and in second case using an external voltage source while using the capsule.
EP02450092A 2001-05-14 2002-04-17 Isolation interne d' une capsule électroacoustique Withdrawn EP1259096A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT7662001 2001-05-14
AT7662001 2001-05-14

Publications (1)

Publication Number Publication Date
EP1259096A2 true EP1259096A2 (fr) 2002-11-20

Family

ID=3680617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02450092A Withdrawn EP1259096A2 (fr) 2001-05-14 2002-04-17 Isolation interne d' une capsule électroacoustique

Country Status (5)

Country Link
US (1) US20020168080A1 (fr)
EP (1) EP1259096A2 (fr)
JP (1) JP2003009290A (fr)
KR (1) KR20020087361A (fr)
CN (1) CN1386036A (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1585365B1 (fr) * 2004-03-30 2011-08-10 AKG Acoustics GmbH Réglage de la tension de polarisation de microphones
US20080042223A1 (en) * 2006-08-17 2008-02-21 Lu-Lee Liao Microelectromechanical system package and method for making the same
US20080075308A1 (en) * 2006-08-30 2008-03-27 Wen-Chieh Wei Silicon condenser microphone
US20080083957A1 (en) * 2006-10-05 2008-04-10 Wen-Chieh Wei Micro-electromechanical system package
US7894622B2 (en) 2006-10-13 2011-02-22 Merry Electronics Co., Ltd. Microphone
JP5269659B2 (ja) * 2009-03-17 2013-08-21 株式会社オーディオテクニカ コンデンサマイクロホンユニット、コンデンサマイクロホンユニットの製造方法、及びコンデンサマイクロホン
CN102186128B (zh) * 2010-07-30 2014-09-10 惠州Tcl移动通信有限公司 抗静电和抗射频干扰的麦克风及移动终端

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT385386B (de) * 1986-07-24 1988-03-25 Akg Akustische Kino Geraete Elektrostatischer wandler

Also Published As

Publication number Publication date
KR20020087361A (ko) 2002-11-22
CN1386036A (zh) 2002-12-18
US20020168080A1 (en) 2002-11-14
JP2003009290A (ja) 2003-01-10

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