EP0581129B1 - Magnetsystem für elektroakustische Wandler - Google Patents

Magnetsystem für elektroakustische Wandler Download PDF

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Publication number
EP0581129B1
EP0581129B1 EP19930111355 EP93111355A EP0581129B1 EP 0581129 B1 EP0581129 B1 EP 0581129B1 EP 19930111355 EP19930111355 EP 19930111355 EP 93111355 A EP93111355 A EP 93111355A EP 0581129 B1 EP0581129 B1 EP 0581129B1
Authority
EP
European Patent Office
Prior art keywords
neodymium
induction
magnet system
air gap
pole plate
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 - Lifetime
Application number
EP19930111355
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0581129A1 (de
Inventor
Gerhard Pfaffinger
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.)
Nokia Technology GmbH
Original Assignee
Nokia Technology 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 Nokia Technology GmbH filed Critical Nokia Technology GmbH
Publication of EP0581129A1 publication Critical patent/EP0581129A1/de
Application granted granted Critical
Publication of EP0581129B1 publication Critical patent/EP0581129B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Definitions

  • the invention is concerned with magnet systems of electroacoustic transducers, in particular with increasing the magnetic flux density in the air gap while at the same time reducing the size of such systems.
  • Magnet systems of electroacoustic transducers are generally constructed in such a way that the pole core is inserted centrally in a magnet pot to the central axis of the system.
  • the free end of the pole core which is not connected to the bottom of the magnetic pot, is connected to the so-called pole plate.
  • the pole plate has a larger diameter than the pole core.
  • the upper edge of the magnetic pot is connected to a disk protruding into the inner diameter of the magnetic pot or is formed in one piece in the manner described above.
  • the edge areas of the pole plate and the part which run parallel to the central axis and which extend into the inner diameter of the magnetic pot protrudes stand opposite each other at a distance and thus form the air gap of the system.
  • the pole core from a material which is known in the field of converter technology under the name neodymium.
  • This magnetically high-energy material has the advantage over the transducers made in ferrite technology that the transducers constructed in neodymium technology can be considerably reduced in size with the same induction in the air gap compared to the transducers made in ferrite technology.
  • Another consequence of the reduction possible in transducers with neodymium training is the reduction in weight of the magnet system which is associated with the reduction.
  • the advantages associated with the use of neodymium as the material for the pole core are not to be understood in such a way that, starting from a predetermined size of the pole core formed from neodymium, the induction in the air gap can be increased as desired by simply increasing the dimensions of the part of the pole core consisting of neodymium can. Rather, when using neodymium as a material for part of the pole core, it is so that the increase in induction that can be achieved increases only disproportionately as the mass of the neodymium part increases can be increased.
  • the invention is therefore based on the object of specifying a magnet system with a neodymium pole core, the achievable induction of which in the air gap is increased compared to the known arrangements.
  • This object is achieved in that a further neodymium disk is arranged on the side of the pole plate facing away from the bottom of the magnetic pot.
  • a particularly uniform field line course in the air gap is achieved if, according to claim 2, the diameter of both neodymium disks is the same.
  • the masses of the two neodymium discs do not necessarily have to be the same size, this has the advantage that the neodymium disc with the larger of the two masses can be arranged on the pole plate.
  • the consequence of this is that the overall height of the magnet system between the bottom and the pole plate or the upper edge of the magnetic pot can be reduced. Due to the possibility of arranging neodymium disks of different sizes or weights on both sides of the pole plate, the required induction in the air gap can be set in a very simple manner simply by changing the mass of one of the two neodymium disks.
  • this makes it possible to prefabricate a unit formed from the first neodymium disc of the pole plate and the magnetic pot for a large number of loudspeaker types and to set the required induction for the various loudspeaker types by attaching the further neodymium disc.
  • FIG. 1 shows a magnet system 10 for an electroacoustic transducer.
  • This magnet system 10 is essentially formed by that on the magnet pot 11 and the pole core 12.
  • the upper edge of the magnetic pot 10 has a circumferential, unshaped flange 13 which points to the central axis of the system.
  • the pole core 12 is formed from a round disk 14 formed from neodymium and a likewise round pole plate 15, the upper end of the neodymium disk 14 being connected to the pole plate 15. Since the diameter of the pole plate 15 is larger than the diameter of the neodymium disc 14, the upper edge of the pole core 12 is also flange-shaped.
  • the pole core 12 is placed and connected with its end facing away from the pole plate 15 centrally to the central axis on the bottom 16 of the magnet pot 11. Since the height level of the magnetic pot 11 and the height level of the pole core 12 connected to the base 16 are the same and the outer diameter of the pole plate 15 is smaller than the inner diameter of the flange 13, the air gap 17 of the magnet system 10 is formed between the flange 13 and the pole plate 15 .
  • the voice coil (not shown) is later inserted into this air gap 17 to complete the electromagnetic transducer.
  • the further neodymium disc 18 is also placed and connected centrally to the central axis in such a way that the similar poles (here the two north poles; N / N) of the two neodymium discs 14, 18 directly and only through one another the pole plate 15 are separately opposite.
  • the diameter the further neodymium disc 18 corresponds to the diameter of the neodymium disc 14 arranged in the pole core 12. This equality in the diameter of both neodymium discs 14, 18 ensures that the field line profile in the air gap 17 has a particularly uniform profile.
  • a further weight saving by using two neodymium discs 14, 18 on both sides of the pole plate 15 resulted from the fact that Because of the reduced mass for the first neodymium disk 14 arranged in the pole core 12, the design of the magnetic pot 11 can also be reduced.
  • FIGS. 2a, b show, it is not necessary that the dimensions and thus also the designs of the two neodymium disks 14, 18 on both sides of the pole plate 15 have to be chosen to be the same size. Rather, in deviation from the illustration in FIG. 1, the neodymium disc 14 arranged in the pole plate 15 can also be made smaller or larger than the other neodymium disc 18. This combination possibility makes it possible to prefabricate the magnetic pot 11 together with the pole core 12 for a large number of loudspeaker types and to adjust the final setting of the induction in the air gap 17 required for the different types by arranging different sized additional neodymium discs 18 on the pole plate 15.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
EP19930111355 1992-07-30 1993-07-15 Magnetsystem für elektroakustische Wandler Expired - Lifetime EP0581129B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4225156 1992-07-30
DE19924225156 DE4225156A1 (de) 1992-07-30 1992-07-30 Magnetsystem für elektroakustische Wandler

Publications (2)

Publication Number Publication Date
EP0581129A1 EP0581129A1 (de) 1994-02-02
EP0581129B1 true EP0581129B1 (de) 1996-09-18

Family

ID=6464440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930111355 Expired - Lifetime EP0581129B1 (de) 1992-07-30 1993-07-15 Magnetsystem für elektroakustische Wandler

Country Status (4)

Country Link
EP (1) EP0581129B1 (ar)
JP (1) JPH06163240A (ar)
DE (2) DE4225156A1 (ar)
DK (1) DK0581129T3 (ar)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19618898A1 (de) * 1996-05-10 1997-11-13 Nokia Deutschland Gmbh Lautsprecher
DE19808688C2 (de) * 1997-03-05 2002-12-12 Harman Audio Electronic Sys Magnetsystem und Verfahren zu seiner Herstellung
GB2371165B (en) * 2001-01-16 2004-12-22 Kh Technology Magnet system for loudspeakers
ITRE20010026A1 (it) 2001-03-23 2002-09-23 S I P E Societ Italiana Elettr Coppe per altoparlanti con magnete al neodimio.
JP3981926B2 (ja) * 2003-11-17 2007-09-26 ソニー株式会社 スピーカ装置
JP2005151253A (ja) 2003-11-17 2005-06-09 Sony Corp スピーカ装置
JP3797561B2 (ja) 2003-11-18 2006-07-19 ソニー株式会社 スピーカ装置
US7894623B2 (en) 2006-03-22 2011-02-22 Harman International Industries, Incorporated Loudspeaker having an interlocking magnet structure
US9854365B2 (en) 2016-04-15 2017-12-26 Harman International Industries, Inc. Loudspeaker motor and suspension system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188790A (en) * 1986-04-04 1987-10-07 Data Recording Instr Co Switched stator winding for an electric motor
GB8810943D0 (en) * 1988-05-09 1988-06-15 Kef Electronics Ltd Loudspeaker
US4926896A (en) * 1988-12-23 1990-05-22 Dresser Industries, Inc. Sensitive electrical to mechanical transducer
DE3936639C1 (en) * 1989-11-03 1991-03-07 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Permanent magnet arrangement e.g. for vehicle loudspeaker - includes associated oscillatory coil arrangement to drive loudspeaker diaphragm
DE4021651C1 (ar) * 1990-07-07 1991-06-27 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De

Also Published As

Publication number Publication date
DE59303831D1 (de) 1996-10-24
DE4225156A1 (de) 1994-02-03
EP0581129A1 (de) 1994-02-02
JPH06163240A (ja) 1994-06-10
DK0581129T3 (ar) 1997-03-17

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