EP1237394A1 - Magnetkreisanordnung für elektrodynamischen Lautsprecher - Google Patents

Magnetkreisanordnung für elektrodynamischen Lautsprecher Download PDF

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Publication number
EP1237394A1
EP1237394A1 EP02290406A EP02290406A EP1237394A1 EP 1237394 A1 EP1237394 A1 EP 1237394A1 EP 02290406 A EP02290406 A EP 02290406A EP 02290406 A EP02290406 A EP 02290406A EP 1237394 A1 EP1237394 A1 EP 1237394A1
Authority
EP
European Patent Office
Prior art keywords
magnet
core
magnetic circuit
cylinder head
coil
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Withdrawn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
EP02290406A
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English (en)
French (fr)
Inventor
Philippe Lesage
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.)
PHL AUDIO
Original Assignee
PHL AUDIO
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 PHL AUDIO filed Critical PHL AUDIO
Publication of EP1237394A1 publication Critical patent/EP1237394A1/de
Withdrawn legal-status Critical Current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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Definitions

  • the present invention relates to magnetic circuits for loudspeakers electrodynamics, as well as such speakers having these magnetic circuits.
  • the so-called "central magnet” is particularly advantageous with regard to the magnetic energy to be supplied by the magnet - which may be only 1.6 greater to that desired in the air gap to move the coil axially mobile-- and very low magnetic leaks.
  • This last property therefore makes it possible to use the loudspeaker provided with a magnetic circuit central magnet near equipment sensitive to magnetic fields, such as video monitors, calculators, on-board instruments planes, etc ...
  • the circuits magnetic with central magnet can be, with equal power, of smaller dimensions than, for example, magnetic circuits with annular magnet, especially since said magnet, if it is made of a very energetic material, such as that containing rare earths, can itself be small.
  • a very energetic material such as that containing rare earths
  • the diameter of said magnet is equal to that of the core, so the travel height for the coil can be determined by the sum of the heights of the core and the central magnet. This results in a limitation of the surface of the magnet and therefore the high performance of these known magnetic circuits. In indeed, if one wishes to increase the energy of the magnet, the only possibility is to increase its thickness, which leads to jointly increase its internal reluctance, and therefore limiting the performance of the magnetic circuit.
  • the object of the present invention is to remedy these drawbacks by improving magnetic circuits with central magnets to increase them further performance by reducing the internal reluctance.
  • the diameter of the magnet can be chosen to achieve superior performance at the same air gap to those of the prior art. Because, to make a magnetic circuit more efficient, it is preferable to increase the surface of the magnet by increasing its diameter rather than increasing its thickness, the reluctance of a disc-shaped magnet being proportional to its height and inversely proportional to its surface.
  • the structure according to the present invention leads to an increase in the core and cylinder head height, and possibly an increase diameter of the latter.
  • the loudspeaker comprising the magnetic circuit according to the present invention is of high power, which requires a core cooling ventilation, or is of the coaxial type requiring a central duct
  • said magnetic circuit is provided with a axial passage through said flat bottom of the cylinder head, said magnet and said core.
  • FIGS. 2, 3 and 4 similar to elements in FIG. 1 have the same reference than these, but assigned a specific index.
  • Figure 1 illustrates, in schematic axial section, a magnetic circuit known, of the central magnet type, intended for an electrodynamic loudspeaker.
  • Figures 2, 3 and 4 illustrate, in schematic axial sections, three embodiments of the magnetic circuit according to this invention.
  • the magnetic circuits of Figures 1 to 4 have identical air gaps, as well as travel heights also identical.
  • the winding 11B is structurally bonded to the support 11A and the assembly 11A-11B is arranged coaxially with the axis of revolution R-R.
  • the winding 11B is arranged in the air gap 10 and the coil 11 can move parallel and coaxially to said axis of revolution R-R, as schematically illustrated by the double arrow 12.
  • the coil 11 is, in known manner and not shown, secured to the speaker diaphragm (not shown) and its suspensions that are the spider and the peripheral edge of the cone (also not shown) and which allow said coil only axial movements by prohibiting any lateral movement that could cause friction of the winding 11B against the edge of the opening 7.
  • the axial position of the coil 11 is such that the plane median 13 of air gap 10 (orthogonal to axis R-R) passes through the middle of the winding 11B, as shown in FIG. 1.
  • the 11B winding is subjected to the magnetic field prevailing in the air gap 10, so that, when it is traversed by a modulation current, the coil 11 moves along the axis of revolution R-R.
  • the magnet 8 has a diameter identical to that of the core 9, so that the cylindrical walls of said magnet and of said core are in extension of one another.
  • the edge 11S thereof, disposed on the side of the bottom 3 is located opposite said bottom 3 and is spaced therefrom by a distance d , representing the height available for moving the coil inside the cylinder head 2.
  • this distance d is determined to be greater than the maximum stroke that the coil 11 can make, inside the cylinder head 2, towards the bottom 3.
  • the distance D separating the bottom 3 from the external face 6E of the annular rim 6 is representative of the distance d , significant of the height available.
  • FIG. 2 there is shown a first embodiment 1.1 of the magnetic circuit for electrodynamic loudspeaker conforming to the present invention.
  • the coil 11 For simplification purposes, the coil 11.
  • the diameter of the magnet 8.1 is larger than that of the core 9.1 and forms a peripheral projection 14, annular and radial, of radial amplitude s , relative to said core 9.1.
  • the radial amplitude s of the projection 14 is, in the example shown in FIG. 2, of the order of the thickness e of the magnet 8.1. More generally, this radial amplitude s could be at most equal to three times the thickness e .
  • the core 9.2 of the magnetic circuit 1.2 differs from the core 9.1 of the magnetic circuit 1.1 in that it comprises, on the side of said magnet 8.2, a protruding heel 15 in the form of a disc, the diameter of which is greater than that of the rest of the 9.2 kernel, but smaller than that of the 8.2 magnet, this the latter also forming the peripheral projection 14, annular and radial, relative to the periphery of the heel 15.
  • the magnetic circuit 1.3 of FIG. 4 comprises a yoke 2.3, an 8.3 magnet and a 9.3 core similar to the corresponding elements 2.2, 8.2 and 9.2 of the magnetic circuit 1.2.
  • the magnets 8.1, 8.2 and 8.3 are made of ternary alloy sintered neodymium-iron-boron.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP02290406A 2001-03-01 2002-02-20 Magnetkreisanordnung für elektrodynamischen Lautsprecher Withdrawn EP1237394A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0102807A FR2821710B1 (fr) 2001-03-01 2001-03-01 Circuit magnetique pour haut-parleur electrodynamique
FR0102807 2001-03-01

Publications (1)

Publication Number Publication Date
EP1237394A1 true EP1237394A1 (de) 2002-09-04

Family

ID=8860617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02290406A Withdrawn EP1237394A1 (de) 2001-03-01 2002-02-20 Magnetkreisanordnung für elektrodynamischen Lautsprecher

Country Status (3)

Country Link
US (1) US20020122558A1 (de)
EP (1) EP1237394A1 (de)
FR (1) FR2821710B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009038593A1 (de) * 2009-08-26 2011-03-03 Beyerdynamic Gmbh & Co. Kg Schallwandler-Magnetsystem

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0272796A (ja) * 1988-09-08 1990-03-13 Mitsubishi Electric Corp 防磁形スピーカーの磁気回路
JPH04259198A (ja) * 1991-02-13 1992-09-14 Sony Corp スピーカーユニット
US5157731A (en) * 1991-01-14 1992-10-20 Pioneer Electronic Corporation Dome radiator speaker
EP0685983A2 (de) * 1994-05-30 1995-12-06 Matsushita Electric Industrial Co., Ltd. Magnetische Schaltung für Lautsprecher und Verfahren zu ihrer Herstellung
JP2000358296A (ja) * 1999-06-16 2000-12-26 Sony Corp スピーカ及びスピーカ装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4312118A (en) * 1980-03-28 1982-01-26 Cts Corporation Method for producing speaker construction
US6004407A (en) * 1995-09-22 1999-12-21 Alps Electric Co., Ltd. Hard magnetic materials and method of producing the same
US6535613B1 (en) * 1999-12-28 2003-03-18 Jl Audio, Inc. Air flow control device for loudspeaker

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0272796A (ja) * 1988-09-08 1990-03-13 Mitsubishi Electric Corp 防磁形スピーカーの磁気回路
US5157731A (en) * 1991-01-14 1992-10-20 Pioneer Electronic Corporation Dome radiator speaker
JPH04259198A (ja) * 1991-02-13 1992-09-14 Sony Corp スピーカーユニット
EP0685983A2 (de) * 1994-05-30 1995-12-06 Matsushita Electric Industrial Co., Ltd. Magnetische Schaltung für Lautsprecher und Verfahren zu ihrer Herstellung
JP2000358296A (ja) * 1999-06-16 2000-12-26 Sony Corp スピーカ及びスピーカ装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 252 (E - 0934) 30 May 1990 (1990-05-30) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 044 (E - 1312) 27 January 1993 (1993-01-27) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 15 6 April 2001 (2001-04-06) *

Also Published As

Publication number Publication date
US20020122558A1 (en) 2002-09-05
FR2821710A1 (fr) 2002-09-06
FR2821710B1 (fr) 2003-06-27

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