EP0591837B1 - Système d'aimant pour un haut-parleur à construction allégée - Google Patents

Système d'aimant pour un haut-parleur à construction allégée Download PDF

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Publication number
EP0591837B1
EP0591837B1 EP93115768A EP93115768A EP0591837B1 EP 0591837 B1 EP0591837 B1 EP 0591837B1 EP 93115768 A EP93115768 A EP 93115768A EP 93115768 A EP93115768 A EP 93115768A EP 0591837 B1 EP0591837 B1 EP 0591837B1
Authority
EP
European Patent Office
Prior art keywords
pole plate
magnet
neodymium
magnet system
disc
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
EP93115768A
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German (de)
English (en)
Other versions
EP0591837A1 (fr
Inventor
Jörg Prokisch
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 EP0591837A1 publication Critical patent/EP0591837A1/fr
Application granted granted Critical
Publication of EP0591837B1 publication Critical patent/EP0591837B1/fr
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
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Definitions

  • the invention relates to the design of magnet systems for cone loudspeakers, in particular to the weight reduction of magnet systems in long-stroke cone loudspeakers.
  • Cone loudspeakers are largely known in terms of their structure and mode of operation in the prior art, so that further discussion is not necessary at this point.
  • the magnet system of such cone loudspeakers is conventionally formed by an annular permanent magnet, an upper and a lower pole plate and a pole core.
  • the pole core is placed centrally on the lower pole plate and is surrounded at a distance by the ring-shaped permanent magnet, the circular surface of which is also connected to the lower pole plate.
  • On the other circular surface of the permanent magnet is the upper, also circular, pole plate put on.
  • the overall length of the pole core is dimensioned such that the free end of the pole core, which is not connected to the lower pole plate, is flush with the upper pole plate when the magnet system is mounted, the inner edge of the upper pole plate surrounding the pole core at a distance.
  • the voice coil connected to the loudspeaker diaphragm is immersed.
  • the permanent magnets formed from ferrite material which are given the required shape during manufacture in the sintering process, all other components of the magnet system are either stamped or extruded.
  • magnet systems are known in the high and midrange range, which are under construction differ from the aforementioned magnet systems.
  • Magnet systems of this type have a magnetic pot, on the bottom of which the pole core is placed centrally to the loudspeaker axis.
  • the pole core is formed from a magnetically high-energy material, which is known under the name neodymium.
  • the end of the pole core which is not connected to the pot bottom is provided with an upper pole plate which has a diameter which exceeds the diameter of the pole core.
  • the height of the pot rim is matched to the height of the pole core and the pole plate.
  • the rim of the pot and the components (pole core and pole plate) arranged in the pot have the same height level.
  • the air gap of the magnet system is formed between the top edge of the pot and the pole plate, since the two components maintain a distance from one another.
  • the upper part of the pot edge that is to say the part which is opposite the pole plate, can also be formed in a pole shape, in which this region of the pot edge projects into the interior of the pot.
  • Magnet systems of this type have the advantage that, compared to comparable loudspeakers with permanent magnets in exclusive ferrite formation, they can be made significantly lighter. The latter, however, only applies to those magnet systems that work in the short stroke range. These are mainly tweeters and midrange speakers. This is due to the fact that despite the outstanding properties of neodymium, the required induction in the air gap is only suitable for narrow winding widths of the voice coil.
  • the invention is therefore based on the object of specifying a cone loudspeaker, in particular a magnet system for cone loudspeakers in the long excursion range, which has a significantly reduced weight compared to the known magnet systems, the permanent magnets of which are formed exclusively from ferrite material.
  • the pole core is at least partially formed from neodymium, that the same poles of the neodymium material in the pole core and of the permanent magnet point in opposite directions with respect to the loudspeaker axis, and that the upper pole plate is constructed in two parts, one part being circular and is connected to the permanent magnet and the other part of the pole plate is disc-shaped and connected to the pole core.
  • This type of design of magnet systems allows long-stroke magnet systems to be designed for cone loudspeakers which have a weight saving of more than 50% compared to magnet systems with permanent magnets made of ferrite material.
  • Under long stroke designed magnet systems are understood to be those magnet systems whose voice coil has a stroke of greater than 3 mm.
  • the pole core of a neodymium disc which rests on a base molded onto the lower pole plate, this has the advantage that the use of neodymium material can be minimized. If the entire pole core were formed from neodymium material, the induction in the air gap would only be insignificantly larger because of the large pole core height in the case of long-stroke magnet systems than if the pole core had only a comparatively thin neodymium disc.
  • a substantial increase in induction in the air gap is achieved if, according to claim 3, a further neodymium disc is arranged on the side of the disc-shaped part of the upper pole plate which faces away from the lower pole plate, and the same poles of the further neodymium disc and the pole core face each other.
  • Figure 1 shows a magnet system 10 for cone speakers in section. The cut runs in this figure, just like in the other figures, at the location of the magnet system 10 at which they have their largest diameter.
  • the magnet system 10, which is shown in FIG. 1 and is designed to reproduce broadband audio signals, is essentially formed by the lower pole plate 11, the annular permanent magnet 12, the pole core 13 and the upper pole plate 14. All of these components or component groups are either punched or extruded or have already received their shape in the sintering process. The latter makes the formation of a magnet system 10 according to FIG. 1 particularly economical.
  • the lower pole plate 11 is connected to the lower side of the annular surface of the permanent magnet 12 formed from ferrite.
  • the base 15 and the disk 17 have the same outside diameter. Compared to the diameter of the latter parts, the diameter of the neodymium disc 16 is somewhat reduced.
  • the neodymium disk 16 can also have a diameter which corresponds to the diameter of the base 15 or the disk 17.
  • the neodymium disc 16 connected to the base 15 is aligned with the upper annular surface of the permanent magnet 12.
  • On the upper annular surface of the permanent magnet 12 is the annularly shaped part 19 upper pole plate 14 placed and connected.
  • the annular part 19 of the upper pole plate 14 and the disk 17, which is arranged on the neodymium disk 16, have the same thickness.
  • the same poles of the permanent magnet 12 and the neodymium disk 16 point in opposite directions. This means that the south pole (S) of the neodymium disk 16 faces the lower pole plate 11 and the south pole (S) of the permanent magnet 12 faces the upper pole plate 14.
  • FIG. 2 shows a magnet system 10 which is of conventional design.
  • This magnet system 10 is formed by an annular permanent magnet 12, which is also formed from ferrite, the lower pole plate 11 and the pole core 13 which is integrally connected to the lower pole plate 11.
  • the pole core 13 and the upper pole plate have the same height level when the magnet system 10 is mounted.
  • the magnet system 10 shown in FIG. 2 also serves to drive a cone loudspeaker, which is designed to be broadband.
  • FIG. 1 Magnet system 10 according to FIG. 1 can be made significantly smaller and thus considerably lighter than the magnet system 10 according to FIG. 2 if, as stated according to the invention, the pole core 13 has a neodymium disk 16.
  • the weight advantages that can be achieved by using the neodymium disk 16 in the pole core 13 are illustrated by the following table, which compares a conventionally designed magnet system 10 according to FIG. 2 with a magnet system 10 according to FIG. 1 which is identical in its mode of operation and in its properties. Magnet system according to FIG. 2 Magnet system according to FIG.
  • FIG. 3 shows a further magnet system 10 which, compared to the magnet system 10 shown in FIG. 1, has a further neodymium disk 21.
  • This further neodymium disc 21 is arranged on the disc 17 such that the same poles (both north poles (N / N) in the exemplary embodiment shown here) of the neodymium disc 16 and another neodymium disc 21 face each other.
  • the induction in the air gap 20 is increased more than if the mass which is allotted to the further neodymium disk 21 are arranged in the pole core 13.
  • the dimensions of the further neodymium disc 21 correspond to the dimensions of the neodymium disc 16 arranged in the pole core 13 in FIG. 3, the invention is not restricted to this identical dimension. Rather, in another embodiment (not shown), the dimensions of both neodymium disks 16, 21 can be chosen to be different from one another. In particular, the height of the two neodymium disks 16, 21 used can be selected differently from one another. The choice of the thickness of the neodymium disks 16, 21 depends on which induction in the air gap 20 is to be set.

Landscapes

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

Claims (3)

  1. Système magnétique (10) pour haut-parleur conique, comprenant :
    - un aimant permanent (12) en forme d'anneau de cercle, en ferrite,
    - une plaque polaire inférieure (11), qui est reliée à la face annulaire inférieure de l'aimant permanent (12),
    - un noyau polaire (13) relié, de manière centrée par rapport à l'axe du haut-parleur, à la plaque polaire inférieure (11), et
    - une plaque polaire supérieure (14), qui est disposée contre la face annulaire supérieure de l'aimant permanent (12),
       caractérisé en ce que
    - le noyau polaire (13) est constitué, du moins en partie, par un matériau au néodyme,
    - en ce que des mêmes pôles du matériau au néodyme dans le noyau polaire (13) et de l'aimant permanent (12) sont orientés dans des directions opposées, par rapport à l'axe du haut-parleur, et
    - la plaque polaire supérieure (14) est conçue en deux parties, une partie (19) étant réalisée en forme d'anneau de cercle et reliée à l'aimant permanent (12), tandis que l'autre partie (17) de la plaque polaire supérieure (14) est réalisée en forme de disque et est reliée au noyau polaire (13).
  2. Système magnétique (10) pour haut-parleur conique selon la revendication 1,
       caractérisé en ce que le noyau polaire (13) est constitué par un disque au néodyme (16), qui repose sur un socle (15) formé d'un seul tenant contre la plaque polaire inférieure (11).
  3. Système magnétique (10) pour haut-parleur conique selon la revendication 1 ou la revendication 2,
       caractérisé en ce qu'on prévoit, au niveau du côté de la partie (17) en forme de disque de la plaque polaire supérieure (14), qui est dirigé à l'opposé de la plaque polaire inférieure (11), un autre disque au néodyme (21), des mêmes pôles de l'autre disque au néodyme et du noyau polaire (13) étant orientés les uns vers les autres.
EP93115768A 1992-10-09 1993-09-30 Système d'aimant pour un haut-parleur à construction allégée Expired - Lifetime EP0591837B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4234069 1992-10-09
DE4234069A DE4234069A1 (de) 1992-10-09 1992-10-09 Konuslautsprecher in Leichtbauweise

Publications (2)

Publication Number Publication Date
EP0591837A1 EP0591837A1 (fr) 1994-04-13
EP0591837B1 true EP0591837B1 (fr) 1997-05-28

Family

ID=6470077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93115768A Expired - Lifetime EP0591837B1 (fr) 1992-10-09 1993-09-30 Système d'aimant pour un haut-parleur à construction allégée

Country Status (6)

Country Link
US (1) US5402503A (fr)
EP (1) EP0591837B1 (fr)
JP (1) JPH06209498A (fr)
DE (2) DE4234069A1 (fr)
DK (1) DK0591837T3 (fr)
ES (1) ES2105030T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8891809B2 (en) 2010-08-25 2014-11-18 Harman International Industries, Inc. Split magnet loudspeaker

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US5802191A (en) * 1995-01-06 1998-09-01 Guenther; Godehard A. Loudspeakers, systems, and components thereof
WO1996033592A1 (fr) * 1995-04-18 1996-10-24 Harman International Industries, Inc. Commande a deux bobines avec boitier multifonction
DE19616794B4 (de) 1996-04-26 2005-09-29 Harman Audio Electronic Systems Gmbh Lautsprecher
US6289106B1 (en) 1997-08-08 2001-09-11 Hong Long Industrial Co., Ltd. Cap and center pole apparatus and method of coupling
US8588457B2 (en) * 1999-08-13 2013-11-19 Dr. G Licensing, Llc Low cost motor design for rare-earth-magnet loudspeakers
CN100348074C (zh) * 1998-11-13 2007-11-07 戈德哈德A·冈瑟 用于稀土磁体扬声器的低成本马达结构
US6654476B1 (en) 1999-08-13 2003-11-25 Godehard A. Guenther Low cost broad range loudspeaker and system
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JP2005151253A (ja) * 2003-11-17 2005-06-09 Sony Corp スピーカ装置
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JP3797561B2 (ja) * 2003-11-18 2006-07-19 ソニー株式会社 スピーカ装置
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KR101374025B1 (ko) * 2013-01-29 2014-03-12 양철훈 평면파를 재현하는 스피커
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US8891809B2 (en) 2010-08-25 2014-11-18 Harman International Industries, Inc. Split magnet loudspeaker

Also Published As

Publication number Publication date
US5402503A (en) 1995-03-28
DE4234069A1 (de) 1994-04-14
EP0591837A1 (fr) 1994-04-13
ES2105030T3 (es) 1997-10-16
JPH06209498A (ja) 1994-07-26
DE59306579D1 (de) 1997-07-03
DK0591837T3 (da) 1997-09-08

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