EP0081780B1 - Transducteur électrodynamique - Google Patents

Transducteur électrodynamique Download PDF

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Publication number
EP0081780B1
EP0081780B1 EP19820111252 EP82111252A EP0081780B1 EP 0081780 B1 EP0081780 B1 EP 0081780B1 EP 19820111252 EP19820111252 EP 19820111252 EP 82111252 A EP82111252 A EP 82111252A EP 0081780 B1 EP0081780 B1 EP 0081780B1
Authority
EP
European Patent Office
Prior art keywords
pin
transducer
membrane
aperture
acoustic
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.)
Expired
Application number
EP19820111252
Other languages
German (de)
English (en)
Other versions
EP0081780A1 (fr
Inventor
Kai Borge Hansen
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.)
Pulse HVT ApS
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of EP0081780A1 publication Critical patent/EP0081780A1/fr
Application granted granted Critical
Publication of EP0081780B1 publication Critical patent/EP0081780B1/fr
Expired 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
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 

Definitions

  • the invention relates to an electrodynamic transducer with a membrane voice coil arrangement held by a fastening ring and a permanent magnet system arranged in a housing, in which the membrane is provided with an opening for damping the low frequencies.
  • Such a converter is known (DE-B-1 230 858).
  • a tube is arranged in the free-swinging part of the membrane.
  • it is also difficult to dimension an acoustic filter designed in this way exactly.
  • a speaker i.e. H. a transducer known (FR-E-34 820), in which the membrane is mechanically guided in such a way that lateral deflection is avoided. This is done using a pin that protrudes into an opening in the center of the membrane. In this known loudspeaker, the opening surrounds the pin so tightly that both can just slide together. In the known loudspeaker, the technical problem and its solution are completely different from those of the application.
  • the object on which the invention is based is to create a transducer in which the undesired low frequencies are damped by simple design measures and the sensitivity of the transducer to these frequencies is thus reduced.
  • the frequency dependence of the acoustic resistance shifts towards higher frequencies.
  • the acoustic reactance is higher than the acoustic resistance, so that the impedance of the acoustic shunt is greater at those frequencies at which the acoustic resistance is frequency-dependent.
  • the distortions resulting from the sensitivity correcting shunt are reduced to a minimum.
  • FIG. 1 shows a known converter which is suitable for the configuration according to the invention.
  • This transducer consists of the membrane vibration coil arrangement 13, 15 arranged on the fastening ring 10 and the permanent magnet system 5, 4, 3, which is held together by the guide rod 2 forming part of the housing 1.
  • the voice coil 15 is arranged concentrically in the air gap 6 formed by the pole pieces 3 and 4.
  • the converter also has a retaining ring 20.
  • the acoustic shunt consists of an elongated circular opening 26 which arises between the outer surfaces of a pin 27, 28 and the inner surface of a hole 29 into which the pin projects.
  • the ring width A (Fig. 4), which limits the path of the air flow through the membrane, is smaller than the diameter of a hole which would be necessary to achieve the same acoustic resistance. As a result, the frequency at which the acoustic resistance becomes frequency-dependent is shifted towards higher frequencies.
  • the fixed pins 27, 28 projecting into the hole 29 ensure that one of the edges delimiting the air flow has a large surface area towards the air flow. The result of this is that the acoustic reactance is large compared to the acoustic resistance at those frequencies at which the resistance is frequency dependent.
  • the annular opening 26 should preferably be arranged concentrically in the membrane.
  • the construction of the transducer, as illustrated in FIG. 1, facilitates the implementation of the pin-hole arrangement, as shown in FIGS. 2 and 3.
  • the pin 27 is a component of the guide rod 2.
  • the hole 29 in the membrane 13 can be punched after the membrane has been fastened to the support ring 10 and with the aid of the same reference surfaces which are used for the adjustment the voice coil can be used, adjusted. Further details related to the manufacture and assembly of the swingarm coils are described in European patent application 0040948.
  • FIG. 3 Another embodiment of the pin-hole arrangement is illustrated in FIG. Instead of connecting the pin to the concentrically arranged guide rod 2, the same effect can be achieved if the pin 28 (FIG. 3) is attached to the retaining ring 20. However, it could prove more difficult to adjust such a pin 28.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Claims (3)

1. Transducteur électrodynamique comprenant un ensemble membrane et organe vibrant (13,15) porté par un anneau de support (10) et un système d'aimant permanent (5, 4, 3) disposé dans un boîtier, la membrane (13) étant pourvue d'une ouverture (29) pour l'amortissement des basses fréquences, caractérisé en ce que, dans l'ouverture (29) s'étend une tige fixe (27, 28) et en ce que cette tige (27, 28) a en coupe la forme d'un cercle, son diamètre étant un peu plus petit que celui de l'ouverture.
2. Transducteur selon la revendication 1, caractérisé en ce que la tige (27) est fixée à ou en une seule pièce avec la tige de guidage (2).
3. Transducteur selon la revendication 1, caractérisé en ce que la tige (28) est fixée à ou en une seule pièce avec l'anneau de fixation (20).
EP19820111252 1981-12-10 1982-12-04 Transducteur électrodynamique Expired EP0081780B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK5473/81 1981-12-10
DK547381A DK148550C (da) 1981-12-10 1981-12-10 Elektrodynamisk transducer med bevaegelig spole

Publications (2)

Publication Number Publication Date
EP0081780A1 EP0081780A1 (fr) 1983-06-22
EP0081780B1 true EP0081780B1 (fr) 1986-10-01

Family

ID=8142738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820111252 Expired EP0081780B1 (fr) 1981-12-10 1982-12-04 Transducteur électrodynamique

Country Status (5)

Country Link
EP (1) EP0081780B1 (fr)
AU (1) AU556443B2 (fr)
DE (1) DE3273600D1 (fr)
DK (1) DK148550C (fr)
NZ (1) NZ202625A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3530869A1 (de) * 1985-08-29 1987-03-12 Sennheiser Electronic Membran fuer einen elektroakustischen wiedergabewandler
DK164621C (da) * 1989-10-09 1992-12-07 Kirk Acoustics As Elektrodynamisk transducer
EP2679023B1 (fr) * 2011-02-25 2019-01-02 Nokia Technologies Oy Appareil transducteur

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR34820E (fr) * 1925-01-09 1927-10-21
DE864269C (de) * 1948-10-31 1953-01-22 Charlotte Thomson Elektrodynamische Schwingspule mit Selbstkuehlung
NL111663C (fr) * 1956-10-11
BE562680A (fr) * 1956-11-26
DE1230858B (de) * 1960-06-22 1966-12-22 Siemens Ag Membran fuer einen elektroakustischen Wandler
DE1762676A1 (de) * 1968-08-02 1970-07-02 Peerles Mb Gmbh Feinmechanik U Membran fuer Mikrofonsystem mit Kugelcharakteristik oder Lautsprechersystem
DE2322475C2 (de) * 1972-02-09 1981-10-08 Fernsprech- Und Signalbau Lehner & Co Kg, 4300 Essen Elektroakustischer Wandler, insbesondere für Sprech- und Hörkapseln von Fernsprechapparaten

Also Published As

Publication number Publication date
DK148550C (da) 1986-04-21
DK547381A (da) 1983-06-11
NZ202625A (en) 1985-08-16
AU556443B2 (en) 1986-11-06
DK148550B (da) 1985-07-29
AU9113282A (en) 1983-06-16
EP0081780A1 (fr) 1983-06-22
DE3273600D1 (en) 1986-11-06

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