EP1120996A2 - Transducteur électro-acoustique - Google Patents

Transducteur électro-acoustique Download PDF

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Publication number
EP1120996A2
EP1120996A2 EP01890004A EP01890004A EP1120996A2 EP 1120996 A2 EP1120996 A2 EP 1120996A2 EP 01890004 A EP01890004 A EP 01890004A EP 01890004 A EP01890004 A EP 01890004A EP 1120996 A2 EP1120996 A2 EP 1120996A2
Authority
EP
European Patent Office
Prior art keywords
membrane
electrode
projection
rigid electrode
rigid
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Withdrawn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
EP01890004A
Other languages
German (de)
English (en)
Other versions
EP1120996A3 (fr
Inventor
Richard Dr. Barnert
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 EP1120996A2 publication Critical patent/EP1120996A2/fr
Publication of EP1120996A3 publication Critical patent/EP1120996A3/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Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to an electroacoustic transducer based on the capacitor principle is based, with an essentially rigid electrode and with a membrane flexible electrode, the distance in the center region of the electrodes between the membrane and the rigid electrode is less than in the edge area and optionally with a resonator attachment.
  • Such a converter is known from W082 / 00745 A1.
  • the rigid electrode a convex shape on its side facing the membrane, which means that of radius distance between the membrane and the rigid electrode different from radius is obtained.
  • the rigid electrode is only by individual hooks in the upper area of a insulating housing held between which the air in a behind the fixed membrane trained chamber can flow, whereby the characteristic and in particular the Directional characteristic of the microphone can be adapted to the desired values.
  • a completely different converter is designed as a hydrophone and from the SU 1 784 111 A3 known:
  • a rigid and a vibratory Electrode used, the vibratable electrode from a dome-shaped Teflon plate is made, the edge of which is free outside the rigid electrode on one Protrudes the housing and the apex of which rests on a screw cap whose twisting changes the height of the Teflon dome by elastic deformation and so the radiation characteristics of the hydrophone are adapted to the desired values can.
  • the flexible electrode can consist of plastic and an electrically conductive Material, optionally gold, can be coated, depending on the rigid electrode Type of charge application, made of conductive or insulating material Charge carriers or an electrically conductive coating or layer.
  • the Contact can be made in a variety of ways and is not part of the invention.
  • the frequency response of such transducers is very much influenced by a resonator attachment and its boundary.
  • the resonator attachment is parallel to the two electrodes and generally consists of a film that is significantly thicker than the membrane and has openings around which To allow passage of sound and to influence it at the same time.
  • This resonator attachment is held in the capsule of the converter (converter housing) by a ring, the Height also affects the transducer characteristics.
  • the rigid electrode can be flat or curved and the membrane can be elastic, be partially plastic or plastically deformed.
  • a is in the center region of the rigid electrode at least essentially circular projection, optionally in one piece, to which the flexible electrode rests, for example is glued on. in case of a
  • This center area is preferably free of charge carriers for electret microphones.
  • the membrane in the center region of the resonator attachment an at least essentially circular projection directed towards the membrane, optionally in one piece.
  • the membrane can be attached to this Tab be glued to ensure that they are not pulled towards the rigid electrode and sticks there under the influence of the opposite charges.
  • the flexible electrode (membrane) is preferred pressed on the projection, this in turn preferably by a nipple, which in the The center of the resonator attachment is attached or provided and the flexible electrode presses against the projection with elastic deformation of the resonator attachment.
  • a resonator attachment 4 is arranged on the front side of the membrane 7 and is held by a retaining ring 2 held and in the illustrated embodiment by flanging the edge of the Housing 5 is fixed.
  • the rigid electrode 8 now has an im in its central region essential circular cylindrical projection 9, to which the membrane 7 by means of a Nipples 3 is pressed.
  • the contact pressure stems from the elastic deformation of the Resonator attachment 4, on which the nipple 3 by inserting a projection in a central opening of the resonator attachment is attached.
  • the circular cylindrical projection 9 a height of about 20 ⁇ m to increase the capsule sensitivity by 3 dB (decibels) and still reliably sticking the membrane 7 to the rigid electrode 8 avoid.
  • the electroacoustic transducer works according to the electret principle and the rigid one If the electrode carries the charges, the circular-cylindrical projection 9 remains preferred unloaded, but the charge carriers reach right up to the ledge. If the membrane 7 carries the charges, it is advantageous to bear against the projection 9 Leave the area of the membrane free of charge.
  • the figure also shows openings in the rigid electrode 8 which prevent that the membrane 7 has to vibrate against an air cushion while the openings are not shown in the resonator attachment. Because these are elements of the prior art, further explanation of these details appears in the Description not necessary.
  • the nipple 3 can be made of plastic, for example ABS (acrylonitrile-butadiene-styrene copolymers), consist.
  • ABS acrylonitrile-butadiene-styrene copolymers
  • the dimensions or relations shown in the schematic figure are not as To see to scale, but it has been found that the nipple 3 a cheap noticeably larger (preferably by at least 10%, particularly preferably by at least 20%) in diameter than the projection 9, and that its outer edges are noticeable rounded (radius of curvature preferably at least equal to 1 mm) are what the projection 9 is not important.
  • the projection 9 (with a typical diameter of 5 to 15% of the free electrode diameter) should in turn be cylindrical or at least almost have cylindrical outer surface so as to ensure that the membrane 7th already just radially outside the end face of the projection 9 a relatively large distance from rigid electrode 8.
  • the spacer between the membrane 7 and the resonator attachment 4 may be different (e.g. ring-shaped) and different attached, e.g. be glued.
  • the membrane 7 can also be placed directly on the projection 9 glued or welded to it (ultrasonic welding). It is possible to on the side of the membrane facing away from the projection, a reinforcement plate or to apply a reinforcement ring.
  • the electrodes and the Resonator attachment be at least substantially circular, but are for Special applications also conceivable deviations from the circular shape.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
EP01890004A 2000-01-27 2001-01-08 Transducteur électro-acoustique Withdrawn EP1120996A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT122002000 2000-01-27
AT0012200A AT411513B (de) 2000-01-27 2000-01-27 Elektroakustischer wandler

Publications (2)

Publication Number Publication Date
EP1120996A2 true EP1120996A2 (fr) 2001-08-01
EP1120996A3 EP1120996A3 (fr) 2008-05-14

Family

ID=3632836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01890004A Withdrawn EP1120996A3 (fr) 2000-01-27 2001-01-08 Transducteur électro-acoustique

Country Status (5)

Country Link
US (1) US6510231B2 (fr)
EP (1) EP1120996A3 (fr)
JP (1) JP2001245393A (fr)
CN (1) CN1320008A (fr)
AT (1) AT411513B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1929699B (zh) * 2005-09-05 2011-03-23 株式会社日立制作所 电声变换元件

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60303189T2 (de) * 2003-09-11 2006-08-24 Akg Acoustics Gmbh Dynamischer elektroakustischer Wandler, insbesondere kleiner Lautsprecher
JP2005098727A (ja) * 2003-09-22 2005-04-14 Hosiden Corp 振動センサ
EP1694094A1 (fr) * 2005-02-18 2006-08-23 AKG Acoustics GmbH Membrane pour convertisseur dynamique
CN101156500B (zh) * 2005-04-19 2011-08-17 星电株式会社 驻极体电容传声器
ATE498978T1 (de) * 2007-11-13 2011-03-15 Akg Acoustics Gmbh Mikrofonanordnung, die zwei druckgradientenwandler aufweist
CN101884224A (zh) * 2007-11-13 2010-11-10 Akg声学有限公司 麦克风装置
EP2262277B1 (fr) * 2007-11-13 2012-01-04 AKG Acoustics GmbH Ensemble de microphones
WO2009105793A1 (fr) * 2008-02-26 2009-09-03 Akg Acoustics Gmbh Ensemble transducteur
TWM395976U (en) * 2010-06-30 2011-01-01 Tsung-Hung Wu Electret electroacoustic transducer
US10201295B2 (en) * 2015-03-13 2019-02-12 Verily Life Sciences Llc User interactions for a bandage type monitoring device
JP7149585B2 (ja) * 2018-12-17 2022-10-07 株式会社オーディオテクニカ 電気音響変換器及び電気音響変換装置
JPWO2021199880A1 (fr) * 2020-03-30 2021-10-07

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE551756C (de) 1928-11-21 1932-06-06 Rudolf Goldschmidt Dr Ing Schalenfoermige Membran (Feder), insbesondere fuer akustische Zwecke
WO1982000745A1 (fr) 1980-08-21 1982-03-04 Kishi K Contre-electrode pour microphone electrostatique et sa structure
US4796725A (en) 1981-09-14 1989-01-10 Matsushita Electric Works, Ltd. Electrostatic transducer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB571778A (en) * 1943-12-10 1945-09-07 Otto Kurt Kolb Improvements relating to condenser microphones
AT323257B (de) * 1973-06-26 1975-07-10 Akg Akustische Kino Geraete Kondensatormikrophon
US3892927A (en) * 1973-09-04 1975-07-01 Theodore Lindenberg Full range electrostatic loudspeaker for audio frequencies
US4016376A (en) * 1975-01-06 1977-04-05 General Signal Corporation Concave diaphragm for electro-acoustic transducer
US5335286A (en) * 1992-02-18 1994-08-02 Knowles Electronics, Inc. Electret assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE551756C (de) 1928-11-21 1932-06-06 Rudolf Goldschmidt Dr Ing Schalenfoermige Membran (Feder), insbesondere fuer akustische Zwecke
WO1982000745A1 (fr) 1980-08-21 1982-03-04 Kishi K Contre-electrode pour microphone electrostatique et sa structure
US4796725A (en) 1981-09-14 1989-01-10 Matsushita Electric Works, Ltd. Electrostatic transducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1929699B (zh) * 2005-09-05 2011-03-23 株式会社日立制作所 电声变换元件

Also Published As

Publication number Publication date
US6510231B2 (en) 2003-01-21
AT411513B (de) 2004-01-26
US20010046306A1 (en) 2001-11-29
ATA1222000A (de) 2003-06-15
CN1320008A (zh) 2001-10-31
EP1120996A3 (fr) 2008-05-14
JP2001245393A (ja) 2001-09-07

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