EP0242856A2 - Haut-parleur coaxial - Google Patents

Haut-parleur coaxial Download PDF

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Publication number
EP0242856A2
EP0242856A2 EP87105855A EP87105855A EP0242856A2 EP 0242856 A2 EP0242856 A2 EP 0242856A2 EP 87105855 A EP87105855 A EP 87105855A EP 87105855 A EP87105855 A EP 87105855A EP 0242856 A2 EP0242856 A2 EP 0242856A2
Authority
EP
European Patent Office
Prior art keywords
coaxial
magnets
membrane
frequency
magnetic circuits
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
EP87105855A
Other languages
German (de)
English (en)
Other versions
EP0242856A3 (en
EP0242856B1 (fr
Inventor
Thomas Deuble
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT87105855T priority Critical patent/ATE71789T1/de
Publication of EP0242856A2 publication Critical patent/EP0242856A2/fr
Publication of EP0242856A3 publication Critical patent/EP0242856A3/de
Application granted granted Critical
Publication of EP0242856B1 publication Critical patent/EP0242856B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • 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
    • H04R2209/022—Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils

Definitions

  • the invention relates to a coaxial loudspeaker with a membrane for emitting tones of high frequencies, the so-called high-frequency membrane, and a membrane for emitting tones of lower frequencies, the low-frequency membrane.
  • the membranes are moved by coaxial voice coils, each of which is immersed in the air gap of a magnetic circuit containing a magnet.
  • Such a loudspeaker is known from DE-OS 28 19 548, in which the low-frequency diaphragm is arranged as a front cone for the loudspeaker and the high-frequency diaphragm in the rear part of the loudspeaker, so that a horn-like construction results for the high-frequency range.
  • this arrangement has the disadvantage that there is a phase shift of the sound emitted by the high-frequency membrane compared to the sound component emitted by the low-frequency membrane. This leads to interference which adversely affects the sound behavior of the speaker.
  • the horn-like construction for the tweeter part brings typical horn distortions, especially in the case of tones of instruments that are sensitive in the high frequency range.
  • the magnets are designed as ring magnets, the coaxial magnetic circuits being stacked one above the other.
  • this enables a reduction in the leakage flux in the region of the pole plates of the magnets, no external feedback is provided for the magnetic field, as a result of which this inherent advantage is at least partially canceled out.
  • neighboring sensitive devices e.g. B. video devices or televisions.
  • the specified construction of the speaker is also complex and therefore expensive.
  • This loudspeaker has flat membranes, namely a small central high-frequency membrane and a low-frequency membrane surrounding it, each of which is provided with a voice coil which plunge into the air gaps of two essentially completely decoupled magnetic circuits.
  • the smaller magnet for the voice coil of the tweeter membrane is in front of the larger magnet for the voice coil of the low frequency membrane.
  • the points of attack of the voice coils on the flat membranes lie in one plane, so that no phase shifts occur as with the above loudspeaker.
  • the magnetic circuit for the voice coil of the low-frequency diaphragm has an external return for the magnetic flux, but the stray flux, in particular upwards towards the diaphragms, can only be reduced by using high-quality material. As a result, the sound quality and the immunity to interference of the speaker are deteriorated.
  • the efficiency of the speaker is relatively low due to the non-coupled magnetic circuits, so that strong and thus expensive magnets are necessary for an acceptable efficiency.
  • the invention has for its object to provide a coaxial speaker that has high sound quality and very good efficiency with simple construction and the least possible material expenditure, so that the effort-performance ratio is optimal.
  • This object is achieved for a loudspeaker whose elastic suspension points of the membranes are in the same plane in that the magnets of the coaxial Magnetic circuits with poles of the same name are arranged opposite one another and have a common pole piece for these poles.
  • This measure increases the magnetic flux density in the common pole piece. This also increases the magnetic flux density in the air gap of the magnetic circuit for the voice coil of the woofer diaphragm, so that the effect of this woofer part is optimized. Accordingly, commercially available inexpensive magnets can be used for this magnetic field. The same advantages apply to the magnetic circuit for the voice coil of the tweeter membrane. This coupling of the magnetic circuits also increases the efficiency of the loudspeaker.
  • the specified measure also significantly reduces the leakage flux, in particular since the magnet for the voice coil of the low-frequency membrane has an external return for the magnetic field and thus a shield.
  • the stray flux of the magnet for the voice coil of the low-frequency diaphragm, which is decisive for interference immunity, is practically made zero by these measures.
  • the coaxial magnetic fields are stacked on top of one another with the interposition of the common pole piece in the direction of the axis of the coaxial loudspeaker, the common pole piece then being a pole plate aligned parallel to the plane in which the points of attack of the voice coils lie on the membranes.
  • the magnets of the magnetic circuits can be nested one inside the other perpendicular to the axis of the coaxial loudspeaker with the interposition of the common, then annular pole piece.
  • a coaxial loudspeaker 1 with a truncated cone-shaped low-frequency diaphragm 2 and a dome-shaped high-frequency diaphragm 3, which are elastically suspended in a loudspeaker carrier 4 at 5 and 6 or 7.
  • the membranes 2 and 3 are each connected to a voice coil 9 and 10, respectively in the area of the beginning of the elastic suspensions 5 and 7, so that the points of engagement of the voice coils 9 and 10 on the membranes 2 and 3 in a common plane 8 lie.
  • the voice coils 9 and 10 are immersed in air gaps each of a magnetic circuit 11 for the low-frequency diaphragm 2 and 12 for the high-frequency diaphragm 3.
  • Each magnetic circuit has a ring magnet 13 or 14, the north and south poles of which are represented by N and S, respectively.
  • the magnets 13 and 14 are coaxial with respect to the central axis A of the loudspeaker 1. They are stacked one above the other, with one between the opposite north poles of the magnets 13 and 14 common pole plate 15 is located for both magnetic circuits, the plate plane of which runs perpendicular to the central axis A of the loudspeaker 1.
  • this pole plate On the inside of the two ring magnets 13 and 14, this pole plate has shoulders 16, through which the ring magnets 13 and 14 are held centrally.
  • the pole plate continues in a central cylindrical extension 17 in the direction of the tweeter membrane up to the air gap 10.
  • the magnetic circuit 12 is closed by an upper pole ring 18, which centers the ring magnet 14 at the same time with a shoulder 18a.
  • the radially outer ends of the pole plate 15 limit the air gap for the voice coil 9 of the low-frequency diaphragm.
  • the magnetic circuit is closed by a pole ring 19 with an L-shaped cross section, which has an extension 20 on its inner edge facing the axis A of the loudspeaker, through which the ring magnet 13 is centered.
  • the arrangement of the ring magnets 13 and 14 with opposite poles of the same name ensures that the magnetic flux lines within the pole plate 15 repel each other and are pressed into the respective air gaps while increasing the magnetic flux density. This almost completely avoids scattering in this area.
  • the entire magnet construction lies radially inside the voice coil 9 for the low-frequency diaphragm 2, so that stray fields always strike the outer pole ring 19 and are conducted back into the air gap of the magnetic circuit 11.
  • the manufacture and assembly of the loudspeaker is simple since the entire arrangement is centered independently by the approaches on the pole rings 18 and 19. In this way, the use of assembly material, such as screws or the like, can be kept to a minimum.
  • FIG. 2 shows a coaxial loudspeaker 1 'with flat membranes 2' for the emission of tones of lower frequencies or 3 'for the emission of tones of higher frequencies.
  • the same reference numerals as in FIG. 1 are used for identical or similar parts, but with a dash (') added.
  • the ring magnets 13 'and 14' are aligned so that their pole faces are coaxial with respect to the central axis A 'of the speaker.
  • a common, in this case annular pole plate 15 ' is arranged, which extends above the magnets as a ring plate 21 to the air gaps of the respective magnetic circuits 11' and 12 '.
  • the magnetic circuit 11 'for the voice coil 9' which is connected to the low-frequency membrane 2 ', is closed by a pole ring 19'
  • the magnetic circuit 12 'for the voice coil 10' of the high-frequency membrane 3 ' is closed by a pole ring 18'.
  • a magnetic shield is optionally provided on the rear of the loudspeaker carrier 4 '.
  • the ring magnets can be either permanent magnets or electromagnets in a conventional manner.
  • the shape of the high-frequency and low-frequency diaphragms is also exemplary, as long as it is ensured that the points of attack of the voice coils on the diaphragms lie essentially in one plane.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
EP87105855A 1986-04-21 1987-04-21 Haut-parleur coaxial Expired - Lifetime EP0242856B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87105855T ATE71789T1 (de) 1986-04-21 1987-04-21 Koaxiallautsprecher.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8610875U 1986-04-21
DE8610875U DE8610875U1 (de) 1986-04-21 1986-04-21 Lautsprecher und Magnetsystem hierfür

Publications (3)

Publication Number Publication Date
EP0242856A2 true EP0242856A2 (fr) 1987-10-28
EP0242856A3 EP0242856A3 (en) 1989-03-15
EP0242856B1 EP0242856B1 (fr) 1992-01-15

Family

ID=6793892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105855A Expired - Lifetime EP0242856B1 (fr) 1986-04-21 1987-04-21 Haut-parleur coaxial

Country Status (3)

Country Link
EP (1) EP0242856B1 (fr)
AT (1) ATE71789T1 (fr)
DE (2) DE8610875U1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668874A1 (fr) * 1990-07-07 1992-05-07 Daimler Benz Ag Systeme a aimants permanents associes a un assemblage de bobines, et utilisation d'un tel systeme dans un haut-parleur ou dans un detecteur.
EP0535297A2 (fr) * 1991-09-30 1993-04-07 Pioneer Electronic Corporation Entretoise pour haut-parleurs coaxiaux
EP0551845A1 (fr) * 1992-01-14 1993-07-21 C.I.A.R.E. S.p.A. Transducteurs électro-acoustiques composite
GB2364847A (en) * 2000-07-11 2002-02-06 Kef Audio Magnet system for a compound loudspeaker
EP2026595A1 (fr) * 2007-08-14 2009-02-18 Klaus Reck Haut-parleur coaxial
DE102010015445A1 (de) 2010-04-17 2011-10-20 Arne Färber Koaxiallautsprecher
GB2502189A (en) * 2013-03-25 2013-11-20 Tannoy Ltd Magnetic assembly for a co-axial loudspeaker
CN106878911A (zh) * 2015-10-14 2017-06-20 音乐集团知识产权有限公司 同轴扬声器及其制造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8610875U1 (de) * 1986-04-21 1986-06-05 Deuble, Thomas, 8998 Lindenberg Lautsprecher und Magnetsystem hierfür
DE102006024054B3 (de) * 2006-05-23 2007-09-20 Klaus Reck Koaxiallautsprecher

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB311486A (en) * 1928-02-27 1929-05-16 British Thomson Houston Co Ltd Improvements relating to electro-magnetic acoustic devices for the interconversion of mechanical and electric oscillations, such as loud-speakers
US2923783A (en) * 1957-06-17 1960-02-02 Stanley F White Electro-acoustical transducer
DE2819548A1 (de) * 1977-05-06 1978-11-09 Tannoy Products Ltd Lautsprecher
DE3007115A1 (de) * 1980-01-19 1981-09-10 Elektrotechnik Ehmann Gmbh, 6953 Gundelsheim Lautsprecher und magnet hierfuer
DE3147169A1 (de) * 1980-11-28 1982-07-08 Hitachi, Ltd., Tokyo Dynamischer lautsprecher
FR2554663A1 (fr) * 1983-11-03 1985-05-10 Magnetfabrik Bonn Gmbh Gewerks Systeme magnetique en pot, a faible dispersion, pour haut-parleurs dynamiques ou convertisseurs acoustiques
JPS60177798A (ja) * 1984-02-23 1985-09-11 Matsushita Electric Ind Co Ltd 同軸平板スピ−カ
DE8610875U1 (de) * 1986-04-21 1986-06-05 Deuble, Thomas, 8998 Lindenberg Lautsprecher und Magnetsystem hierfür

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB311486A (en) * 1928-02-27 1929-05-16 British Thomson Houston Co Ltd Improvements relating to electro-magnetic acoustic devices for the interconversion of mechanical and electric oscillations, such as loud-speakers
US2923783A (en) * 1957-06-17 1960-02-02 Stanley F White Electro-acoustical transducer
DE2819548A1 (de) * 1977-05-06 1978-11-09 Tannoy Products Ltd Lautsprecher
DE3007115A1 (de) * 1980-01-19 1981-09-10 Elektrotechnik Ehmann Gmbh, 6953 Gundelsheim Lautsprecher und magnet hierfuer
DE3147169A1 (de) * 1980-11-28 1982-07-08 Hitachi, Ltd., Tokyo Dynamischer lautsprecher
FR2554663A1 (fr) * 1983-11-03 1985-05-10 Magnetfabrik Bonn Gmbh Gewerks Systeme magnetique en pot, a faible dispersion, pour haut-parleurs dynamiques ou convertisseurs acoustiques
JPS60177798A (ja) * 1984-02-23 1985-09-11 Matsushita Electric Ind Co Ltd 同軸平板スピ−カ
DE8610875U1 (de) * 1986-04-21 1986-06-05 Deuble, Thomas, 8998 Lindenberg Lautsprecher und Magnetsystem hierfür

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 16 (E-375)[2073], 22. Januar 1986; & JP-A-60 177 798 (MATSUSHITA DENKI SANGYO K.K.) 11-09-1985 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668874A1 (fr) * 1990-07-07 1992-05-07 Daimler Benz Ag Systeme a aimants permanents associes a un assemblage de bobines, et utilisation d'un tel systeme dans un haut-parleur ou dans un detecteur.
EP0535297A2 (fr) * 1991-09-30 1993-04-07 Pioneer Electronic Corporation Entretoise pour haut-parleurs coaxiaux
EP0535297A3 (en) * 1991-09-30 1995-03-01 Pioneer Electronic Corp Spacer for coaxial loudspeakers
EP0551845A1 (fr) * 1992-01-14 1993-07-21 C.I.A.R.E. S.p.A. Transducteurs électro-acoustiques composite
GB2364847A (en) * 2000-07-11 2002-02-06 Kef Audio Magnet system for a compound loudspeaker
GB2364847B (en) * 2000-07-11 2004-10-13 Kef Audio Compound loudspeaker having a magnet system
EP2026595A1 (fr) * 2007-08-14 2009-02-18 Klaus Reck Haut-parleur coaxial
US8284983B2 (en) 2007-08-14 2012-10-09 Klaus Reck Coaxial loudspeaker
DE102010015445A1 (de) 2010-04-17 2011-10-20 Arne Färber Koaxiallautsprecher
DE102010015445B4 (de) * 2010-04-17 2012-10-25 Arne Färber Koaxiallautsprecher
GB2502189A (en) * 2013-03-25 2013-11-20 Tannoy Ltd Magnetic assembly for a co-axial loudspeaker
GB2502189B (en) * 2013-03-25 2014-06-04 Tannoy Ltd Loudspeaker
US9271071B2 (en) 2013-03-25 2016-02-23 Music Group Innovation Sc Ltd. Loudspeaker
CN106878911A (zh) * 2015-10-14 2017-06-20 音乐集团知识产权有限公司 同轴扬声器及其制造方法

Also Published As

Publication number Publication date
ATE71789T1 (de) 1992-02-15
EP0242856A3 (en) 1989-03-15
DE8610875U1 (de) 1986-06-05
EP0242856B1 (fr) 1992-01-15
DE3775970D1 (de) 1992-02-27

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