EP2768245A1 - Ensemble de montage d'aimant pour un haut-parleur et procédé de démontage de celui-ci - Google Patents

Ensemble de montage d'aimant pour un haut-parleur et procédé de démontage de celui-ci Download PDF

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Publication number
EP2768245A1
EP2768245A1 EP13155032.9A EP13155032A EP2768245A1 EP 2768245 A1 EP2768245 A1 EP 2768245A1 EP 13155032 A EP13155032 A EP 13155032A EP 2768245 A1 EP2768245 A1 EP 2768245A1
Authority
EP
European Patent Office
Prior art keywords
pedestal
mount assembly
magnet
support
aperture
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Withdrawn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
EP13155032.9A
Other languages
German (de)
English (en)
Inventor
Steven Williams
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.)
Harman International Industries Ltd
Original Assignee
Harman International Industries Ltd
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 Harman International Industries Ltd filed Critical Harman International Industries Ltd
Priority to EP13155032.9A priority Critical patent/EP2768245A1/fr
Publication of EP2768245A1 publication Critical patent/EP2768245A1/fr
Withdrawn legal-status Critical Current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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers

Definitions

  • the embodiments described herein relate to a magnet mount assembly for a loudspeaker, a loudspeaker and methods for assembling and disassembling a magnet mount assembly.
  • a transducer is a device that converts one form of an input signal into another form.
  • Loudspeakers are one example of the transducer and convert electrical signals into sound.
  • Loudspeakers include a diaphragm, a voice coil and a magnet.
  • the voice coil is connected to the diaphragm and arranged in an air gap, in which the magnet generates magnetic flux.
  • a magnetic field is induced which interacts with the magnetic flux in air gap generated by the magnet. This interaction causes the voice coil to oscillate, which in turn causes the diaphragm to move and sound to be generated.
  • the magnet is part of a magnet structure which may include, among other components, one or more magnets, a core cap and a shell pot.
  • the shell pot may provide a housing which contains the magnet and the core.
  • the shell pot may have a cylindrical shape with a base which defines a hollow interior.
  • the magnet may be disposed on the base of the shell pot and the core cap may be mounted on the magnet or between two magnets.
  • adhesives may be used to secure the position of the magnet, the core cap and the shell pot with respect to one another. Under some circumstances, it may be desirable to disassemble the magnet structure, in order to remove or replace one or more of the components for example.
  • a magnet mount assembly for a loudspeaker which includes a support comprising a receiver portion and a pedestal, the receiver portion being configured to receive a magnet of the loudspeaker, and a shell pot having a base and a peripheral wall protruding from the base, the base including an aperture.
  • the shell pot is configured to receive the support and the pedestal is insertable into the aperture to detachedly attach the support to the shell pot.
  • a method for disassembling a magnet mount assembly for a loudspeaker including a shell pot having a base and a peripheral wall protruding from the base, the base including an aperture, and a support including a receiver portion and a pedestal, the receiver portion retaining a magnet of the loudspeaker.
  • the receiver portion is positioned in the shell pot.
  • the pedestal is positioned in the aperture and detachedly attaches the support to the shell pot.
  • the method includes applying a force to the pedestal in a direction generally parallel to a longitudinal axis of the aperture, detaching the pedestal from the aperture, and removing the support from the shell pot.
  • FIG. 1 illustrates a perspective view of a magnet mount assembly 10 according to a first embodiment in a partially disassembled position.
  • the magnet mount assembly 10 includes a shell pot 11 and a support 12.
  • the shell pot 11 includes a base 13 and a peripheral wall 14 defining a hollow interior 15 for receiving a magnet.
  • the shell pot 11 further includes an aperture 16 in the base 13.
  • the shell pot 11 has a generally cylindrical form and the aperture 16 is positioned coaxially with respect to the peripheral wall 14.
  • the base 13 of the shell pot 11 includes a raised pedestal portion 17 in which the aperture 16 is positioned so that the aperture 16 is defined by inner walls 18 providing an elongated aperture.
  • the magnet mount assembly 10 further includes a resilient member 19 which is arranged on the inner walls 18 of the aperture 16.
  • the resilient member 19 defines a cylindrical aperture 20 which extends through the raised portion pedestal portion 17 of the base 13.
  • the resilient member 19 comprises a resilient grommet.
  • the support 12 includes a receiver portion 21 having a recess 22 in an upper surface 23, the recess 22 being configured to receive a magnet.
  • the support 12 further includes a pedestal 24 which has a generally cylindrical form with a longitudinal axis. The pedestal 24 extends from a lower surface 25 of the support 12. In this particular embodiment, the pedestal 24 includes a protruding structure on its outer surface in the form of a coarse thread 26.
  • the support 12 is configured to be accommodated within the hollow interior 15 of the shell pot 11 and the pedestal 24 is configured to mechanically engage the resilient member 19 when the pedestal 24 is inserted in the aperture 20 in order to detachedly attach the support 12 to the shell pot 11.
  • the outer diameter is of the pedestal 24 is slightly larger than the diameter of the aperture 20.
  • the support 12 and the shell pot 11 comprise a ferromagnetic material such as steel and the resilient member 19 may comprise rubber.
  • a lower surface 27 of the pedestal 24 includes an engagement portion 28 which is configured to engage a non-illustrated magnet removal tool.
  • the engagement portion 28 comprises an indentation 29.
  • the magnet mount assembly may be assembled by inserting the pedestal 24 of the support 12 into the aperture 20 of the resilient member 19 which is itself retained in the aperture 16 of the base 13 of the shell pot 11.
  • the resilient member is resiliently deformed by the pedestal as the diameter of the aperture 20 is slightly smaller than the diameter of the pedestal 24.
  • the resilient member 19 exerts a force on the pedestal 24 and the pedestal 24 is retained within the aperture 20 and detachedly attached to the base 13, whereby the support 12 is detachedly attached to the shell pot 11.
  • the pedestal 24 includes an outer surface with a coarse thread 26.
  • the pedestal may be detachedly attached to the resilient member 19 by screwing the pedestal 24 into the aperture 20 of the resilient member 19.
  • the lower surface 27 of pedestal 24 is positioned in the aperture 20 which extends through the base 13 of the shell pot 11.
  • the indentation 29 is accessible from outside of the shell pot 11 via the aperture 20.
  • a magnet removal tool may be inserted into the indentation 29 in order to apply force to the pedestal 24 in a direction perpendicular to the base 13 of the shell pot 11 and parallel to the longitudinal axis of the pedestal 24.
  • the applied force is greater than the force between the pedestal 24 and the resilient member 19, the pedestal 24 is caused to move with respect to the resilient member 19, thus detaching the support 12 from the shell pot 11 and allowing the support structure 12 to be removed from the shell pot 11.
  • the outer surface of the pedestal 24 includes a coarse thread 26.
  • the pedestal 24 may be removed from the aperture 20 of the resilient member 19 by a screwing action.
  • a magnet In the assembled position of the magnet mount assembly, a magnet is positioned in the recess 22 and may be attached to the recess 22 by a layer of adhesive. Therefore, by removing the support 12 from the shell pot 11, the magnet is removed from within the hollow interior 15 of the shell pot 11.
  • the magnet is attached to the support 12, which is detachedly attached to the shell pot 11, rather than being directly fixed to the shell pot 11, for example by an adhesive.
  • This arrangement enables the magnet to be easily removed from the shell pot 11. This is useful in order to be able to recycle the magnets, for example.
  • the magnet may be a rare earth-based magnet such as a neodymium-iron-boron-based magnet.
  • the cost of the rare earth elements, such as neodymium has risen significantly in recent years. Therefore, the magnet mount assembly 10 may be used to facilitate the removal of a magnet from the shell pot 11 in order to enable the rare earth elements to be extracted from the magnet.
  • FIG. 2 illustrates a cross-sectional view of the support 12 of the magnet mount assembly 10 and FIG. 3 illustrates a top view of the support 12 illustrated in FIG. 2 .
  • the support 12 includes two through holes 30 positioned towards the periphery of the recess 22 on opposing sides of the recess 22.
  • the through holes 30 provide fixing holes for a press to unlock mechanism.
  • FIG. 4 illustrates a cross-sectional view of the shell pot 11 and the support 12 of the magnet mount assembly 10
  • FIG. 5 illustrates a cross-sectional view of the support 12 and the shell pot 11 including the resilient member 19 positioned in the aperture 16 of the base 13 of the shell pot 11.
  • the aperture 16 in the base 13 of the shell pot 11 comprises an inwardly protruding portion 31 which, in this particular embodiment has a ring shape.
  • the inwardly protruding portion 31 provides a retainer for retaining the resilient member 19 within the aperture 16.
  • FIG. 6a illustrates a cross-sectional view
  • FIG. 6b illustrates a side view of the resilient member 19.
  • the resilient member 19 includes a groove 32 in its outer surface which is configured to engage the protruding portion 31 of the aperture 16 so that the resilient member 19 is retained within the aperture 16 of the base 13.
  • the resilient member 19 provides an aperture 20 having a generally cylindrical form with a diameter which is slightly smaller than the outer diameter of the pedestal 24 in order to allow mechanical engagement between the pedestal 24 and the resilient member 19 and to detachedly attach the support 12 to the shell pot 11.
  • the lower surface 25 of the receiver portion 21 of the support 12 also comprises a recessed portion 33 in the form of a ring which surrounds the base of the pedestal 24.
  • the resilient member 19 has dimensions such that a portion 34 protrudes above the upper surface 35 of the raised pedestal portion 17 of the shell pot 11. This protruding portion 34 of the resilient member 19 is able to mate with the recessed portion 33 in the lower surface 25 of the receiver portion 21 after insertion of the pedestal 24 into the aperture 20 of the resilient member 19 to provide a resilient connection between the support 12 and the shell pot 11.
  • FIG. 7 illustrates a magnet structure 40 of a loudspeaker.
  • the magnet structure 40 includes the support 12 with the receiver portion 21 and the pedestal 24, the resilient member 19 in the form of a rubber grommet, a first magnet 41 arranged in the recess 22 of the support 12, a core cap 42 positioned on the first magnet 41 and a second magnet 43 positioned on the core cap 42.
  • the magnets 41, 43 and the core cap 42 may have an interlocking structure or may be mounted to one another by adhesive.
  • the resilient member 19 is illustrated in the assembled position of the magnetic mount assembly 10.
  • the protruding portion 34 of the resilient member 19 is positioned within the recess portion 33 on the lower surface 25 of the support 12 and provides an additional mechanical interlocking between the support 12 and the resilient member 19.
  • the lower surface 25 of the receiver portion is, in the assembled position, spaced at a slight distance from the upper surface 35 of the raised pedestal portion 17 of the base 13 of the shell pot 11.
  • the first magnet 41, the core cap 42 and the second magnet 43 are supported by support 12 and may be detached from the shell pot 11 along with the support 12 by applying force to the lower surface 27 of the pedestal 24, for example by a screwing action if the outer surface of the pedestal includes a thread.
  • a loudspeaker including a magnet mount assembly includes a magnet, a support comprising a receiver portion and a pedestal, the receiver portion retaining the magnet, and a shell pot having a base and a peripheral wall protruding from the base, the base comprising an aperture.
  • the support is positioned within the shell pot and the pedestal is positioned in the aperture and detachedly attaching the support to the shell pot.
  • a method for assembling a magnet mount assembly for a loudspeaker includes providing a support comprising a receiver portion and a pedestal, the receiver portion being configured to receive a magnet of the loudspeaker, providing a shell pot having a base including an aperture, the shell pot being configured to receive the support, and inserting the pedestal into the aperture to detachedly attach the support to the shell pot.

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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)
EP13155032.9A 2013-02-13 2013-02-13 Ensemble de montage d'aimant pour un haut-parleur et procédé de démontage de celui-ci Withdrawn EP2768245A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13155032.9A EP2768245A1 (fr) 2013-02-13 2013-02-13 Ensemble de montage d'aimant pour un haut-parleur et procédé de démontage de celui-ci

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13155032.9A EP2768245A1 (fr) 2013-02-13 2013-02-13 Ensemble de montage d'aimant pour un haut-parleur et procédé de démontage de celui-ci

Publications (1)

Publication Number Publication Date
EP2768245A1 true EP2768245A1 (fr) 2014-08-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13155032.9A Withdrawn EP2768245A1 (fr) 2013-02-13 2013-02-13 Ensemble de montage d'aimant pour un haut-parleur et procédé de démontage de celui-ci

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EP (1) EP2768245A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12081956B2 (en) 2022-09-21 2024-09-03 Harman International Industries, Incorporated Speaker assembly with mechanically-coupled magnet

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2155474A (en) * 1934-11-30 1939-04-25 Rca Corp Loudspeaker
US2395166A (en) * 1942-12-24 1946-02-19 Astatic Corp Transducer
US2501031A (en) * 1945-11-30 1950-03-21 Rca Corp Magnetic field structure for dynamic loud-speakers and the like
GB721325A (en) * 1952-07-04 1955-01-05 Harry Claude Willson Improvements relating to electro-dynamic sound reproducers of the moving coil type
US5548657A (en) * 1988-05-09 1996-08-20 Kef Audio (Uk) Limited Compound loudspeaker drive unit
US5590210A (en) * 1993-04-09 1996-12-31 Kabushiki Kaisha Kenwood Loudspeaker structure and method of assembling loudspeaker
WO2008103723A1 (fr) * 2007-02-22 2008-08-28 Harman International Industries, Incorporated Système de captage de flux magnétique de haut-parleur

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2155474A (en) * 1934-11-30 1939-04-25 Rca Corp Loudspeaker
US2395166A (en) * 1942-12-24 1946-02-19 Astatic Corp Transducer
US2501031A (en) * 1945-11-30 1950-03-21 Rca Corp Magnetic field structure for dynamic loud-speakers and the like
GB721325A (en) * 1952-07-04 1955-01-05 Harry Claude Willson Improvements relating to electro-dynamic sound reproducers of the moving coil type
US5548657A (en) * 1988-05-09 1996-08-20 Kef Audio (Uk) Limited Compound loudspeaker drive unit
US5590210A (en) * 1993-04-09 1996-12-31 Kabushiki Kaisha Kenwood Loudspeaker structure and method of assembling loudspeaker
WO2008103723A1 (fr) * 2007-02-22 2008-08-28 Harman International Industries, Incorporated Système de captage de flux magnétique de haut-parleur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JUERGEN WITTIG: "Julian Baufix", 4 March 2010 (2010-03-04), pages 1, XP054975205, Retrieved from the Internet <URL:https://www.youtube.com/watch?v=bOexwETbA8Q> [retrieved on 20130906] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12081956B2 (en) 2022-09-21 2024-09-03 Harman International Industries, Incorporated Speaker assembly with mechanically-coupled magnet

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