[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

DE2503828A1 - Permanent magnet dynamic electro-acoustic transducer - has toroidal permanent magnet with soft iron core and flange connection - Google Patents

Permanent magnet dynamic electro-acoustic transducer - has toroidal permanent magnet with soft iron core and flange connection

Info

Publication number
DE2503828A1
DE2503828A1 DE19752503828 DE2503828A DE2503828A1 DE 2503828 A1 DE2503828 A1 DE 2503828A1 DE 19752503828 DE19752503828 DE 19752503828 DE 2503828 A DE2503828 A DE 2503828A DE 2503828 A1 DE2503828 A1 DE 2503828A1
Authority
DE
Germany
Prior art keywords
soft iron
iron core
plastic body
permanent magnet
connector tabs
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
DE19752503828
Other languages
German (de)
Other versions
DE2503828C3 (en
DE2503828B2 (en
Inventor
Walter Dipl Ing Gademann
Franz V Kramolin
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.)
Friedrich Reiner Telefonfabrik & Co KG Gadema GmbH
Original Assignee
FRIEDRICH REINER TELEFONFABRIK
GADEMANN WALTER
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 FRIEDRICH REINER TELEFONFABRIK, GADEMANN WALTER filed Critical FRIEDRICH REINER TELEFONFABRIK
Priority to DE19752503828 priority Critical patent/DE2503828C3/en
Publication of DE2503828A1 publication Critical patent/DE2503828A1/en
Publication of DE2503828B2 publication Critical patent/DE2503828B2/en
Application granted granted Critical
Publication of DE2503828C3 publication Critical patent/DE2503828C3/en
Expired legal-status Critical Current

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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/10—Telephone receivers
    • 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
    • H04R1/06—Arranging circuit leads; Relieving strain on circuit leads

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

The transducer is in the form of a capsule, suitable for telephone apparatus, and has a contact pin for insertion into sleeve contacts on connecting wires. The magnetic system consists of a toroidal magnet (1) with a tubular soft iron core (4a), connected to the magnet by a soft iron flange (4b), with a second soft iron flange (4c) it forms the air gap for the voice solenoid coil (8). A plastics element (5a, 5b), inside the soft iron core (4a) carries the contact pins (2) connected with the solenoid coil leads (9). Preferably the plastics element is in two parts, the outer part forming the support for the contact pins and the inner part forming apertures the contact pin ends, coupled to solenoid coil lead ends. Both parts have abutment surfaces for the front edges of the tubular soft iron core. The two parts may be screwed together.

Description

Permanentdynamische elektro-akustische Wandlerkapsel Die Erfindung betrifft eine permanentdynamische elektroakustische Wandlerkapsel, insbesondere für Fernsprech-Handapparate, die mit Steckerlaschen zum Aufstecken von an den Zuleitungsdrähten angeordneten Steckhülsen ausgebildet ist. Permanent dynamic electro-acoustic transducer capsule The invention relates to a permanently dynamic electroacoustic transducer capsule, in particular For telephone handsets that have connector lugs for plugging into the lead wires arranged receptacles is formed.

Eine derartige Wandlsrkapsel ist z. B. in der DT-PS 1 249 934 beschrieben. Such a Wandlsrkapsel is z. B. in DT-PS 1 249 934 described.

Die erfindungsgemäße Wandlerkapsel der vorstehend erläuterten Art ist dadurch gekennzeichnet, dals das Magnetsystem aus einem Ringmagnet mit rohrförmigem Weicheisenkern besteht, der mit dem Ringmagnet über einen Weicheisen-Ringflansch in Verbindung steht und mit einem zweiten mit dem Ringmagnet in Verbindung stehenden Ringflansch den Luftspalt für die Tauchspule bildet, und daß in dem Rohrinnenraum des Weicheisenkerns ein Kunststoffkörper als Träger der mit den Tauchspulenzuführungen verbundenen Steckerlaschen vorgesehen ist. The transducer capsule according to the invention of the type explained above is characterized in that the magnet system consists of a ring magnet with a tubular The soft iron core is connected to the ring magnet via a soft iron ring flange is in communication and with a second with the ring magnet in communication Annular flange forms the air gap for the plunger coil, and that in the pipe interior of Soft iron core a plastic body as a carrier with the Plunger coil feeds connected connector tabs is provided.

Zweckmäßigerweise ist die Wandlerkapsel so ausgebildet, daß der Kunststoffkörper zweiteilig ist und sein Außenteil der Träger für die Steckerlaschen ist und sein Innenteil Durchtrittsöffnungen für die mit den Tauchspulenzuleitungen verbundenen Enden der Steckerlaschen hat, und daß beide Teile des Kunststoffkörpers Auflageflächen zur Auflage an den Stirnkanten des rohrförmigen Weicheisenkerns aufweisen und mittels einer Eefestigungsschraube miteinander verbunden sind, wobei im Außenteil des Kunststoffkörpers Vertiefungen für die die Kontaktflächen bildenden Abschnitte der Steckerlaschen vorgesehen sein können.The transducer capsule is expediently designed so that the plastic body is in two parts and its outer part is the carrier for the connector tabs and will be Inner part passage openings for those connected to the plunger coil leads Has ends of the connector tabs, and that both parts of the plastic body have bearing surfaces have to rest on the front edges of the tubular soft iron core and by means of a fastening screw are connected to one another, wherein in the outer part of the plastic body Depressions for the sections of the connector tabs that form the contact surfaces can be provided.

Zweckmäßigerweise ist zwischen dem Außenteil und dem Innenteil des Kunststoffkörpers und der Innenrohrwandung des Weicheisenkerns ein akustischer Resonanzraum gebildet, und der Innenteil des Kunststoffkörpers weist in den Resonanzraum führende Luftdurchtrittsöffnungen auf.Appropriately is between the outer part and the inner part of the Plastic body and the inner tube wall of the soft iron core an acoustic resonance chamber formed, and the inner part of the plastic body has leading into the resonance chamber Air passage openings.

Der durch die Erfindung gegenüber dem Stand der Technik erreichte technische Fortschritt liegt in folgendem: Es wird eine raumsparende Konstruktion geschaffen, bei der die zum Aufstecken der Steckhülsen ausgebildeten Steckerlaschen innerhalb des Gesamtprofils der Wandlerkapsel liegen, also nicht der Gefahr eines Verbiegens ausgesetzt sind, wenn eine solche Kapsel von einem Monteur in einer Montagetasche mitgeführt wird. Dies wird dadurch erreicht, daß ein Oxid-Ringkernmagnet verwendet wird, der infolge seines relativ großen Querschnitts ungeachtet seiner nicht extrem hohen Permeabilität die erforderliche Feldstärke im Tauchspulenspalt zu erzielen gestattet. Der Ringmagnet gestattet einen verhältnismäßig großen Querschnitt für den Weicheisenkern, der beim erfindungsgemäßen Wandler rohrförmig ausgebildet ist und Platz für einen Isolierkörper mit entsprechend angeordneten Steckerlaschen bietet.The one achieved by the invention over the prior art Technical progress lies in the following: It is a space-saving construction created in which the connector tabs designed for plugging on the sockets lie within the overall profile of the transducer capsule, so not the risk of a Are exposed to bending when such a capsule by a fitter in an assembly bag is carried. This is achieved by using an oxide toroidal core magnet which is not extreme due to its relatively large cross-section regardless of its high permeability to achieve the required field strength in the moving coil gap allowed. The ring magnet allows one relatively large Cross section for the soft iron core, which is tubular in the converter according to the invention is formed and space for an insulating body with appropriately arranged Connector lugs offers.

Ein Ausführungsbeispiel der Erfindung wird im folgenden an Hand der Zeichnung näher erläutert. Es zeigen: Fig. 1 eine Draufsicht auf eine erfindungsgemäße Wandlerkapsel, von unten gesehen; Fig. 2 einen Querschnitt 2-2 durch die Wandlerkapsel.An embodiment of the invention is described below with reference to the Drawing explained in more detail. The figures show: FIG. 1 a plan view of an inventive device Converter capsule seen from below; 2 shows a cross section 2-2 through the transducer capsule.

Die in den Figuren auftretenden Bezugszeichen haben die folgende Bedeutung. 1 ist der Ringmagnet, der aus Oxidmaterial bestehen kann. 2 sind die Steckerlaschen, die in Vertiefungen 3 eines unteren Isolierkörpers 5a angeordnet sind, die Bodenflächen dieser Vertiefungen durchsetzen und Öffnungen in einem oberen Isolierkörper 5b durchsetzen, wo sie mit den Zuleitungen 9 einer Tauchspule 8 verbunden sind.The reference symbols appearing in the figures have the following meaning. 1 is the ring magnet, which can be made of oxide material. 2 are the connector tabs, which are arranged in depressions 3 of a lower insulating body 5a, the bottom surfaces these indentations through and through openings in an upper insulating body 5b, where they are connected to the leads 9 of a plunger coil 8.

Der Luftspalt für die Tauchspule wird durch den rohrförmigen Weicheisenkern 4a und einen Flanschring 4c gebildet, der an der Oberseite mit dem Ringmagnet 1 in Verbindung steht. Der Innenkern 4a hat einen Flansch 4b, der an der unteren Seite in Verbindung mit dem Ringmagnet 1 steht und den magnetischen Kraftfluß vervollständigt.The air gap for the plunger coil is created by the tubular soft iron core 4a and a flange ring 4c is formed, which is connected to the ring magnet 1 communicates. The inner core 4a has a flange 4b on the lower side is in connection with the ring magnet 1 and completes the magnetic flux.

Der Innenteil 5b und der Außenteil 5a des Kunststoffkörpers sitzen mit entsprechenden Schultern auf den Stirnflächen des rohrförmigen Weicheisenkerns 4a auf und werden zweckmäßigerweise mittels einer nicht gezeigten Schraube zusammengehalten. Es bildet sich so zwischen der Innenrohrwand des Weicheisenkerns 4a und dem Außenteil 5a und dem Innenteil 5b des Kunststoffkörpers ein bekannten Zwecken dienender akustischer Resonanzraum 6, zu dem im Innenteil 5b vorgesehene Öffnungen 7 einen Luftdurchtritt bilden.- 10 ist ein Kunststoffkörper. Die Schallmembran ist mit 11 bezeichnet, und 12 ist ein Schutzdeckel.The inner part 5b and the outer part 5a of the plastic body sit with corresponding shoulders on the end faces of the tubular soft iron core 4a and are expediently held together by means of a screw, not shown. It forms between the inner pipe wall of the Soft iron core 4a and the outer part 5a and the inner part 5b of the plastic body are known Purposes serving acoustic resonance chamber 6, for which provided in the inner part 5b Openings 7 form an air passage. 10 is a plastic body. The sound membrane is denoted by 11, and 12 is a protective cover.

Patentansprüche:Patent claims:

Claims (4)

Patentanst>rüche Permanentdynamische elektro-akustische Wandlerkapsel, insbesondere für Fernsprech-Handapparate, mit Steckerlaschen zum Aufstecken von an den Zuleitungsdrähten angeordneten Steckhülsen, d a d u r c h g e ke n n z e i c h n e t daß das Magnetsystem aus einem Ringmagnet (1) mit rohrförmigem Weicheisenkern (4a) besteht, der mit dem Ringmagnet (1) über einen Weicheisen-Ringflansch (4b) in Verbindung steht und mit einem zweiten mit dem Ringmagnet (1) in Verbindung stehenden Ringflansch (4c) den Luftspalt für die Tauchspule (8) bildet, und daß in dem Rohrinnenraum des Weicheisenkerns (4a) ein Kunststoffkörper (5a, 5b) als Träger der mit den Tauchspulenzuführungen (9) verbundenen Steckerlaschen (2) vorgesehen ist. Patent application Permanent dynamic electro-acoustic transducer capsule, in particular for telephone handsets, with connector tabs for plugging in receptacles arranged on the supply wires, d u r c h g e k n n z e i c h n e t that the magnet system consists of a ring magnet (1) with a tubular soft iron core (4a), which is connected to the ring magnet (1) via a soft iron ring flange (4b) is in connection and with a second with the ring magnet (1) in connection Annular flange (4c) forms the air gap for the plunger coil (8), and that in the pipe interior of the soft iron core (4a) a plastic body (5a, 5b) as a carrier with the moving coil feeds (9) connected connector tabs (2) is provided. 2. Wandlerkapsel nach Anspruch 1, d a d u r c h g e -k e n n z e i c h n e t , daß der Kunststoffkörper zweiteilig ist, sein Außenteil der Träger für die Steckerlaschen (2) ist und sein Innenteil (5b) Durchtrittsöffnungen für die mit den Tauchspulenzuleitungen (9) verbundenen Enden der Steckerlaschen (2) aufweist, und daß beide Teile (5a, 5b) des Kunststoffkörpers Auflageflächen zur Auflage an den Stirnkanten des rohrförmigen Weicheisenkerns (4a) haben und z.B.2. converter capsule according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that the plastic body is in two parts, its outer part of the carrier for the connector tabs (2) and its inner part (5b) through openings for the having ends of the plug lugs (2) connected to the moving coil leads (9), and that both parts (5a, 5b) of the plastic body support surfaces for support have the front edges of the tubular soft iron core (4a) and e.g. mittels einer Befestigungsschraube miteinander verbunden sind.are connected to one another by means of a fastening screw. 3. Wandlerkapsel nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß der Außenteil (5a) des Kunststoffkörpers Vertiefungen (3) für die die Kontaktflächen bildenden Abschnitte der Steckerlaschen (2) aufweist.3. converter capsule according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the outer part (5a) of the plastic body depressions (3) for the sections of the connector tabs (2) which form the contact surfaces. 4. Wandlerkapsel nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß zwischen dem Außenteil (5a) und dem Innenteil (5b) des Kunststoffkörpers und der Innenrohrwandung des Weicheisenkerns (4a) ein akustischer Resonanzraum (6) gebildet ist und der Innenteil (5b) des Kunststoffkörpers in den Resonanzraum (6) zu ) führende Luftdurchtrittsöffnungen (7) hat.4. converter capsule according to one of the preceding claims, d a d u r c h g e k e n n n z e i c h n e t that between the outer part (5a) and the inner part (5b) of the plastic body and the inner tube wall of the soft iron core (4a) acoustic resonance chamber (6) is formed and the inner part (5b) of the plastic body has air passage openings (7) leading into the resonance chamber (6).
DE19752503828 1975-01-30 1975-01-30 Permanent dynamic electroacoustic transducer capsule Expired DE2503828C3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752503828 DE2503828C3 (en) 1975-01-30 1975-01-30 Permanent dynamic electroacoustic transducer capsule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752503828 DE2503828C3 (en) 1975-01-30 1975-01-30 Permanent dynamic electroacoustic transducer capsule

Publications (3)

Publication Number Publication Date
DE2503828A1 true DE2503828A1 (en) 1976-08-05
DE2503828B2 DE2503828B2 (en) 1979-05-10
DE2503828C3 DE2503828C3 (en) 1983-04-21

Family

ID=5937701

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19752503828 Expired DE2503828C3 (en) 1975-01-30 1975-01-30 Permanent dynamic electroacoustic transducer capsule

Country Status (1)

Country Link
DE (1) DE2503828C3 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017434B1 (en) * 1979-04-07 1983-03-23 Mardon Illingworth Limited Cup-shaped containers and method and apparatus for manufacturing them
EP0821861A1 (en) * 1995-04-18 1998-02-04 Harman International Industries Incorporated Dual coil drive with multipurpose housing
WO1999014980A2 (en) * 1997-09-17 1999-03-25 Frank Albert Bilan A loudspeaker with lead wires extending through the magnetic assembly and integrated with an amplifier
US6072886A (en) * 1997-02-28 2000-06-06 U.S. Philips Corporation Electroacoustic transducer comprising spring contacts formed with at least one bend
US6385328B1 (en) * 1999-08-23 2002-05-07 Microtech Corporation Electro-acoustic micro-transducer having three-mode reproduction feature
CN102200529A (en) * 2011-03-24 2011-09-28 北京工业大学 Ultrasonic transducer for detecting by insertion into stainless steel corrugated pipe
JP2014187712A (en) * 2014-06-04 2014-10-02 Genelec Oy Wiring arrangement for wiring litz wire of drive unit and drive unit with wiring arrangement
EP2770745A3 (en) * 2009-12-17 2014-11-26 Genelec OY A wiring arrangement for wiring litz wires of a loudspeaker drive unit and a drive unit comprising the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2852176C2 (en) * 1978-12-02 1985-06-05 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Arrangement for leveling the frequency curve in an electroacoustic transducer
DE2936965C2 (en) * 1979-09-13 1982-04-01 Standard Elektrik Lorenz Ag, 7000 Stuttgart Permanent dynamic electroacoustic transducer capsule
DE2940367C2 (en) * 1979-10-05 1986-07-31 Fernsprech- und Signalbau KG Schüler & Vershoven, 4300 Essen Dynamic earpiece
WO1998038832A1 (en) * 1997-02-28 1998-09-03 Koninklijke Philips Electronics N.V. Electroacoustic transducer comprising spring contacts formed with at least one bend

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE836497C (en) * 1945-12-03 1952-04-15 Philips Nv Vibration system provided with a membrane, in particular electrodynamic system, e.g. for microphones, loudspeakers, vibration sensors, etc.
DE856614C (en) * 1940-12-31 1952-11-24 Guenther Wurdel Electrodynamic earphone capsule
DE1219521B (en) * 1964-01-08 1966-06-23 Standard Elektrik Lorenz Ag Electrodynamic converter in telecommunications technology
DE1240127B (en) * 1965-09-28 1967-05-11 Siemens Ag Electrodynamic converter
DE2032051B1 (en) * 1970-06-29 1971-11-18 Standard Elektrik Lorenz Ag, 7000 Stuttgart Electrodynamic converter
DE2248023B1 (en) * 1972-09-29 1973-12-20 Krone Gmbh Carbon microphone built into the microphone capsule, in particular a telephone handset

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE856614C (en) * 1940-12-31 1952-11-24 Guenther Wurdel Electrodynamic earphone capsule
DE836497C (en) * 1945-12-03 1952-04-15 Philips Nv Vibration system provided with a membrane, in particular electrodynamic system, e.g. for microphones, loudspeakers, vibration sensors, etc.
DE1219521B (en) * 1964-01-08 1966-06-23 Standard Elektrik Lorenz Ag Electrodynamic converter in telecommunications technology
DE1240127B (en) * 1965-09-28 1967-05-11 Siemens Ag Electrodynamic converter
DE2032051B1 (en) * 1970-06-29 1971-11-18 Standard Elektrik Lorenz Ag, 7000 Stuttgart Electrodynamic converter
DE2248023B1 (en) * 1972-09-29 1973-12-20 Krone Gmbh Carbon microphone built into the microphone capsule, in particular a telephone handset

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017434B1 (en) * 1979-04-07 1983-03-23 Mardon Illingworth Limited Cup-shaped containers and method and apparatus for manufacturing them
EP0821861A4 (en) * 1995-04-18 2000-01-05 Harman Int Ind Dual coil drive with multipurpose housing
EP0821861A1 (en) * 1995-04-18 1998-02-04 Harman International Industries Incorporated Dual coil drive with multipurpose housing
US6072886A (en) * 1997-02-28 2000-06-06 U.S. Philips Corporation Electroacoustic transducer comprising spring contacts formed with at least one bend
US6243472B1 (en) * 1997-09-17 2001-06-05 Frank Albert Bilan Fully integrated amplified loudspeaker
WO1999014980A3 (en) * 1997-09-17 1999-06-03 Frank Albert Bilan A loudspeaker with lead wires extending through the magnetic assembly and integrated with an amplifier
WO1999014980A2 (en) * 1997-09-17 1999-03-25 Frank Albert Bilan A loudspeaker with lead wires extending through the magnetic assembly and integrated with an amplifier
US6385328B1 (en) * 1999-08-23 2002-05-07 Microtech Corporation Electro-acoustic micro-transducer having three-mode reproduction feature
EP2770745A3 (en) * 2009-12-17 2014-11-26 Genelec OY A wiring arrangement for wiring litz wires of a loudspeaker drive unit and a drive unit comprising the same
US9020178B2 (en) 2009-12-17 2015-04-28 Genelec Oy Drive unit mounting arrangement and loudspeaker
CN102200529A (en) * 2011-03-24 2011-09-28 北京工业大学 Ultrasonic transducer for detecting by insertion into stainless steel corrugated pipe
CN102200529B (en) * 2011-03-24 2012-09-05 北京工业大学 Ultrasonic transducer for detecting by insertion into stainless steel corrugated pipe
JP2014187712A (en) * 2014-06-04 2014-10-02 Genelec Oy Wiring arrangement for wiring litz wire of drive unit and drive unit with wiring arrangement

Also Published As

Publication number Publication date
DE2503828C3 (en) 1983-04-21
DE2503828B2 (en) 1979-05-10

Similar Documents

Publication Publication Date Title
DE19914235B4 (en) An electroacoustic transducer and hearing aid comprising an electroacoustic transducer
DE2503828A1 (en) Permanent magnet dynamic electro-acoustic transducer - has toroidal permanent magnet with soft iron core and flange connection
DE1615070A1 (en) Pressure medium-tight connection block
DE2854912A1 (en) ELECTROACOUSTIC CONVERTER
DE7502763U (en) PERMANENT DYNAMIC ELECTROACOUSTIC CONVERTER CAPSULE
DE1217468B (en) Low-capacity, high-strength housing, preferably for microwave components, and method for its manufacture
DE1537801C3 (en) Circuit arrangement for a telephone subscriber station with several connecting lines for conference call switching
DE2936965C2 (en) Permanent dynamic electroacoustic transducer capsule
DE1240127B (en) Electrodynamic converter
DE2845694A1 (en) Permanent magnet type loudspeaker unit - has dish integrally formed with frame so that inner dia. of former can equal dia. of upper plate of magnetic system
DE2433824B2 (en) Sealable handset for telephone equipment composed of two housing halves
EP0022544B1 (en) Electrodynamic transducer, in particular for telephonic apparatus
DE2512562A1 (en) SYMMETRIC FORK SHIFTING FOR A TELEPHONE
DE2119913C3 (en) Electroacoustic converter
EP0821540A2 (en) Voice coil contacts arrangement
DE4007678A1 (en) Dynamic electroacoustic transducer for radio telephone handpiece - has housing receiving insert containing magnetic system and providing support face for membrane edge
AT227802B (en) Electrodynamic sound transducer
DE1797780U (en) SPEAKER.
CH653198A5 (en) CAN-shaped earpiece for telephony handsets, with an electro-dynamic converter.
DE461711C (en) Process for making the low-frequency speech currents of a radio receiver perceptible
DE2440841B2 (en) HANDSET TELEPHONE
DE4419953A1 (en) Piezoelectric composite receiver for use in telephones
DE690053C (en) Arrangement for telecommunication systems, especially telephone systems, for fritting contacts
DE880329C (en) Feed-through capacitor
DE681789C (en) Reel socket for mobile telecommunication cables

Legal Events

Date Code Title Description
OD Request for examination
8381 Inventor (new situation)

Free format text: GADEMANN, WALTER, DIPL.-ING. KRAMOLIN, FRANZ V., 8000 MUENCHEN, DE

C3 Grant after two publication steps (3rd publication)
8327 Change in the person/name/address of the patent owner

Owner name: FRIEDRICH REINER TELEFONFABRIK GMBH & CO KG GADEMA

8339 Ceased/non-payment of the annual fee