EP1022929A3 - Loudspeaker with a jacketed magnetic core - Google Patents

Loudspeaker with a jacketed magnetic core Download PDF

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Publication number
EP1022929A3
EP1022929A3 EP00100968A EP00100968A EP1022929A3 EP 1022929 A3 EP1022929 A3 EP 1022929A3 EP 00100968 A EP00100968 A EP 00100968A EP 00100968 A EP00100968 A EP 00100968A EP 1022929 A3 EP1022929 A3 EP 1022929A3
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
permanent magnet
alloy
core
rare earth
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.)
Granted
Application number
EP00100968A
Other languages
German (de)
French (fr)
Other versions
EP1022929A2 (en
EP1022929B1 (en
Inventor
Johann Lang
Manfred Aigner
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 Becker Automotive Systems GmbH
Original Assignee
Harman Becker Automotive Systems 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 Harman Becker Automotive Systems GmbH filed Critical Harman Becker Automotive Systems GmbH
Publication of EP1022929A2 publication Critical patent/EP1022929A2/en
Publication of EP1022929A3 publication Critical patent/EP1022929A3/en
Application granted granted Critical
Publication of EP1022929B1 publication Critical patent/EP1022929B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
    • H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/026—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets protecting methods against environmental influences, e.g. oxygen, by surface treatment
    • 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
    • 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
    • H04R9/06—Loudspeakers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

Die Erfindung betrifft einen Lautsprecher nach dem dynamischen Wandlerprinzip. Dieser Lautsprecher zeigt einen Dauermagneten 1, der einen Kern 10 aus einer hochmagnetischen Legierung mit einem Element der Gruppe der Seltenen Erden, insbesondere aus einer Neodymlegierung, aufweist. Diese Legierungen sind stark oxidationsgefährdend und reagieren sehr heftig auf Luftfeuchtigkeit. Dieser Kern 10 wird von einer Kunststoffschicht 11 ummantelt, die Partikel aus einer entsprechenden Legierung mit einem Element aus der Gruppe der Seltenen Erden aufweist. Durch diesen Aufbau des Dauermagneten 1 ist ein sehr starkes Magnetfeld gegeben, das einen hohen Wirkungsgrad des Lautsprechers bewirkt. Zudem erweist sich dieser Dauermagnet 1 für den erfindungsgemäßen Lautsprecher als wenig anfällig gegen äußere schädliche Einflüsse.

Figure imgaf001
The invention relates to a loudspeaker according to the dynamic transducer principle. This loudspeaker shows a permanent magnet 1 having a core 10 of a high magnetic alloy with a rare earth element, in particular a neodymium alloy. These alloys are highly oxidizing and react very violently to atmospheric moisture. This core 10 is encased by a plastic layer 11 comprising particles of a corresponding alloy with a rare earth element. By this structure of the permanent magnet 1, a very strong magnetic field is given, which causes a high efficiency of the speaker. In addition, this permanent magnet 1 proves to be less susceptible to external harmful influences for the speaker according to the invention.
Figure imgaf001
EP20000100968 1999-01-23 2000-01-19 Loudspeaker with a jacketed magnetic core Expired - Lifetime EP1022929B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999102679 DE19902679C1 (en) 1999-01-23 1999-01-23 speaker
DE19902679 1999-01-23

Publications (3)

Publication Number Publication Date
EP1022929A2 EP1022929A2 (en) 2000-07-26
EP1022929A3 true EP1022929A3 (en) 2007-06-13
EP1022929B1 EP1022929B1 (en) 2008-03-12

Family

ID=7895212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000100968 Expired - Lifetime EP1022929B1 (en) 1999-01-23 2000-01-19 Loudspeaker with a jacketed magnetic core

Country Status (2)

Country Link
EP (1) EP1022929B1 (en)
DE (2) DE19902679C1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011080606A1 (en) * 2011-08-08 2013-02-14 Sennheiser Electronic Gmbh & Co. Kg Dynamic electroacoustic transducer
JP5724767B2 (en) * 2011-09-01 2015-05-27 住友金属鉱山株式会社 Outer magnet type magnetic circuit unit for speaker and manufacturing method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255816A2 (en) * 1986-08-04 1988-02-10 Treibacher Chemische Werke Aktiengesellschaft Preparation process for corrosion resistant magnetic permanent powder used in magnet manufacturing; permanent magnets produced from permanent magnet powder and their manufacturing method
EP0323125A1 (en) * 1987-12-28 1989-07-05 Shin-Etsu Chemical Co., Ltd. Rare earth permanent magnet
EP0441616A2 (en) * 1990-02-09 1991-08-14 Matsushita Electric Industrial Co., Ltd. Anisotropic plastic bonded magnet of the Nd-Fe-B-type and method for making same
US5269855A (en) * 1989-08-25 1993-12-14 Dowa Mining Co., Ltd. Permanent magnet alloy having improved resistance
EP0685983A2 (en) * 1994-05-30 1995-12-06 Matsushita Electric Industrial Co., Ltd. Magnetic circuit unit for loud-speaker and method of manufacturing the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3730305C1 (en) * 1987-09-10 1989-03-23 Daimler Benz Ag speaker

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255816A2 (en) * 1986-08-04 1988-02-10 Treibacher Chemische Werke Aktiengesellschaft Preparation process for corrosion resistant magnetic permanent powder used in magnet manufacturing; permanent magnets produced from permanent magnet powder and their manufacturing method
EP0323125A1 (en) * 1987-12-28 1989-07-05 Shin-Etsu Chemical Co., Ltd. Rare earth permanent magnet
US5269855A (en) * 1989-08-25 1993-12-14 Dowa Mining Co., Ltd. Permanent magnet alloy having improved resistance
EP0441616A2 (en) * 1990-02-09 1991-08-14 Matsushita Electric Industrial Co., Ltd. Anisotropic plastic bonded magnet of the Nd-Fe-B-type and method for making same
EP0685983A2 (en) * 1994-05-30 1995-12-06 Matsushita Electric Industrial Co., Ltd. Magnetic circuit unit for loud-speaker and method of manufacturing the same

Also Published As

Publication number Publication date
DE50015036D1 (en) 2008-04-24
DE19902679C1 (en) 2000-11-16
EP1022929A2 (en) 2000-07-26
EP1022929B1 (en) 2008-03-12

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