EP1460881B1 - Magnetsystem eines Schallwandlers - Google Patents

Magnetsystem eines Schallwandlers Download PDF

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Publication number
EP1460881B1
EP1460881B1 EP04450043A EP04450043A EP1460881B1 EP 1460881 B1 EP1460881 B1 EP 1460881B1 EP 04450043 A EP04450043 A EP 04450043A EP 04450043 A EP04450043 A EP 04450043A EP 1460881 B1 EP1460881 B1 EP 1460881B1
Authority
EP
European Patent Office
Prior art keywords
housing
pole plate
transducer
thickness
magnetic
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
EP04450043A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1460881A2 (de
EP1460881A3 (de
Inventor
Hugo Dr. Lenhard-Backhaus
Ernst Dipl.-Ing. Stöttinger
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.)
AKG Acoustics GmbH
Original Assignee
AKG Acoustics 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 AKG Acoustics GmbH filed Critical AKG Acoustics GmbH
Priority to AT04450043T priority Critical patent/ATE409397T1/de
Publication of EP1460881A2 publication Critical patent/EP1460881A2/de
Publication of EP1460881A3 publication Critical patent/EP1460881A3/de
Application granted granted Critical
Publication of EP1460881B1 publication Critical patent/EP1460881B1/de
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
    • 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
    • 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

Definitions

  • the invention relates to the magnetic system of a based on the electrodynamic principle, miniaturized transducer having a housing made of deep-drawn sheet metal, a magnet having magnet system and a membrane, which is provided with a coil, lead from the wires to a contact point has.
  • Such transducers are in particular for installation in small devices, such as telephones, mobile phones, hands-free devices for phones, headphones or the like. intended.
  • miniaturized electro-acoustic sound generators are equipped with a diaphragm and a plunger coil attached to it, a membrane holder, a magnet system and optionally a front cover and / or a back cover.
  • the invention also relates to a method for producing a transducer.
  • Electroacoustic sound generators for the dynamic principle have been known for almost one hundred years and find their application as speakers, headphones or in various acoustic applications such as the listening side of a telephone. They are called “converter” for the sake of simplicity.
  • the publication US-A-5,751,828 discloses, for example, a manufacturing method of such a transducer, in particular, bonding of a magnetic powder and a steel sheet.
  • the strength of the magnetic field in the air gap of the transducer is primarily dependent on the magnetic strength and the volume of the permanent magnet. The stronger and the bigger a magnet is, the more potential there is in it. However, this potential can only be exploited if the length of the magnetic lines up to the air gap and the material in which they run do not attenuate them too much. This is a second important factor in maximizing the magnetic field strength. Generally speaking, long and "thin" paths are always bad because they weaken the magnetic lines of force as they propagate through the yoke. Knowing the magnetic properties of the materials used, the calculation of the magnetic fields is very similar to the calculations in electrical circuits.
  • the magnetic circuits for electroacoustic transducers are designed so that in a relatively narrow annular air area (air gap) reaches the maximum magnetic field strength.
  • air gap air gap
  • the size of the magnet is very limited. The more the execution of the magnetic yoke plays an important role. Generally speaking, it is important not to unnecessarily thin the yoke. Therefore, magnetic cup thicknesses below 2mm are poor and below 0.5mm are hardly usable because they cause too much loss. The same applies to the pole plate.
  • a second important role of a pole plate is to allow linear magnetic field strength in the air gap of an acoustic transducer as possible. This means that (in the direction transverse to the axis of symmetry, thus radially), the magnetic field distribution should be constant. Therefore, the pole plate usually has a thickness which corresponds approximately to the stroke of the diaphragm. Depending on the type and application of the converter between 0.5 mm and 2 mm.
  • the plunger coils are usually up to 300% longer than the pole plate is thick. This is necessary to make it possible that even with the extreme amplitudes of the membrane, the coil is still at least one third of its length in the air gap region.
  • the housing For converters with diameters of about 10 centimeters, it is therefore common to produce the housing by deep drawing sheet metal of suitable thickness, usually about 2 mm thick.
  • the invention now relates to miniaturized transducers with a diameter of less than about 20 mm, which does not allow the use of such sheet thicknesses in the deep-drawing process.
  • the use of thin sheets in turn is not appropriate for the reasons mentioned above, which is why despite the problems associated with it, the plastic housing mentioned above are still used.
  • the invention has set itself the task of changing the mechanical design of the converter so that a fully automatic converter production, especially of very small transducers to less than 10 mm in diameter, without much effort is possible and without the quality of the converter is deteriorated.
  • the housing with an outer diameter of 20 mm maximum of thin steel sheet with a maximum thickness of 0.2 mm that the magnet system has a lower pole plate and an upper pole plate and that the pole plates are made of sheet steel having a thickness of at least 1.5 times the mean thickness of the bottom of the housing.
  • average thickness is necessary because of the differences in the wall thickness occurring at different points of the finished housing during deep drawing of the housing.
  • the pole plates have a thickness of at least 1.5 times, preferably at least twice, more preferably three times, the mean thickness of the bottom of the housing.
  • the lower pole plate is part, preferably in one piece, of a magnet pot whose jacket region is at least substantially up to the upper one Surface of the upper pole plate is enough.
  • a further development of the latter variant is characterized in that the wall thickness of the magnet pot corresponds to at least 1.5 times, preferably at least 2 times, more preferably at least 3 times, the mean thickness of the bottom of the housing. As a result, a particularly homogeneous magnetic field is achieved in the region of the dip gap.
  • An inventive method for producing a transducer according to the invention with lower pole plate is characterized in that the lower pole plate is used in deep drawing of the housing in the manner of a lost core in the mold.
  • the lower pole plate is used in deep drawing of the housing in the manner of a lost core in the mold.
  • An inventive method for producing a transducer according to the invention with magnet pot is characterized in that the magnet pot is used in deep drawing of the housing in the manner of a lost core in the mold.
  • the advantages are the same as in the aforementioned method.
  • An inventive transducer 1 consists of a sheet steel housing 6, which is deep-drawn and punched, so that a membrane seat surface 2 for a diaphragm 14, rear sound openings 3, the mounting recess for a magnet system 4 are formed and that connection wires 5 of a coil 13, can be guided to connection contacts 15.
  • the use of plates for transducer fabrication is in and of itself prior art, and has long been used in the manufacture of loudspeakers. Since the relatively large diameter of usually a few decimeters of a loudspeaker allows the use of thicker steel sheets, it is possible from the production, directly form the magnetic yoke (magnet and pole plate) with the cup-shaped steel sheet of the speaker housing. Since the steel sheets used are up to two millimeters thick, they have no negative effect on the strength of the magnetic field in the air gap of the magnet system. The use of thinner steel sheets reduces the magnetic field strength in the air gap of the magnet system and thus the speaker efficiency drastically.
  • the invention provides a magnet system 4, as it is in Fig. 2 is shown, consisting of a pot 8, a magnet 9 and a pole plate 10 to connect with a deep-drawn sheet metal housing.
  • a magnet system 4 as it is in Fig. 2 is shown, consisting of a pot 8, a magnet 9 and a pole plate 10 to connect with a deep-drawn sheet metal housing.
  • the invention proposes as a preferred manufacturing method, during deep drawing of Housing 6, as in Fig. 3 or 4 schematically indicated to insert the pot 8 and the lower pole plate 11 in the thermoforming tool and deep draw with the housing plate. This results in a firm and adhesive-free connection between the pot 8 and the lower pole plate 11 of the magnet system and the remaining housing parts 6 of the converter. 1
  • thermoformed according to the invention of thin sheet steel converter housing 1 also has openings 3. These serve the necessary acoustic tuning of the transducer and are known to those skilled in the field of electroacoustics and their number, size and location to determine easily.
  • a practical magnet yoke according to the invention of a small transducer has a magnet of 0.9 mm, a pole plate of 0.3 mm thickness and a magnet cup of 0.4 mm thick. This magnet pot is housed in a 0.2 mm thick transducer housing ( Fig. 1 Part 6).
  • the invention also proposes an improvement in the implementation of the wires 5 from the coil to the contact point in this context.
  • Fig. 5 shown schematically, in the course of the deep drawing process in the outer region of the converter housing 6 in the region of the opening 3, are guided by the wires 5, two elevations 12 are formed.
  • the wires 5 can be guided between these elevations and optionally fixed there with adhesive.
  • the Fig. 6 shows, purely schematically and not to scale, a section normal to the (in Fig. 6 not shown) wires; the Fig. 7 also schematically, a section in the region of an opening 3, which is not formed as a simple opening, but also with elevations.
  • the size of the opening is in Fig. 7 deliberately presented differently than in the Fig. 1 to illustrate the wide spectrum.
  • apertures 3 in the housing 6 also in the bottom region of the pot 8 or in the region of the second pole plate 11, corresponding to corresponding recesses or openings in the pot or pole plate, in order to achieve the desired acoustic tuning.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Amplifiers (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
EP04450043A 2003-03-17 2004-03-01 Magnetsystem eines Schallwandlers Expired - Lifetime EP1460881B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT04450043T ATE409397T1 (de) 2003-03-17 2004-03-01 Magnetsystem eines schallwandlers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT4182003 2003-03-17
AT0041803A AT414196B (de) 2003-03-17 2003-03-17 Magnetsystem eines schallwandlers

Publications (3)

Publication Number Publication Date
EP1460881A2 EP1460881A2 (de) 2004-09-22
EP1460881A3 EP1460881A3 (de) 2007-04-11
EP1460881B1 true EP1460881B1 (de) 2008-09-24

Family

ID=32777531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04450043A Expired - Lifetime EP1460881B1 (de) 2003-03-17 2004-03-01 Magnetsystem eines Schallwandlers

Country Status (7)

Country Link
US (1) US7151840B2 (zh)
EP (1) EP1460881B1 (zh)
JP (1) JP2004282761A (zh)
CN (1) CN100359990C (zh)
AT (2) AT414196B (zh)
DE (1) DE502004008108D1 (zh)
DK (1) DK1460881T3 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4652035B2 (ja) * 2004-12-07 2011-03-16 パイオニア株式会社 スピーカ
JP4913748B2 (ja) * 2005-11-15 2012-04-11 パイオニア株式会社 スピーカ、および磁気回路
KR100811739B1 (ko) 2006-06-02 2008-03-11 에스텍 주식회사 스피커
DE102008024816B4 (de) * 2008-05-23 2015-07-16 Sennheiser Electronic Gmbh & Co. Kg Dynamischer elektro-akustischer Wandler und Hörer
CN102413405B (zh) * 2011-11-16 2014-06-04 瑞声声学科技(深圳)有限公司 磁路系统及使用该磁路系统的发声器件

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723397A (en) * 1980-07-18 1982-02-06 Pioneer Electronic Corp External magnetic type magnetic circuit of dynamic loudspeaker
GB2104346A (en) * 1981-08-13 1983-03-02 Jensen Int Inc Integral combined core and back plate for loudspeaker and process for fabricating the same
JP3045032B2 (ja) * 1994-02-22 2000-05-22 松下電器産業株式会社 ヘッドホン
JP3161673B2 (ja) * 1994-05-30 2001-04-25 松下電器産業株式会社 マイクロスピーカ用磁気回路ユニット及びその製造方法
US5764784A (en) * 1994-09-12 1998-06-09 Sanyo Electric Co., Ltd. Electroacoustic transducer
KR20020046897A (ko) * 2000-12-09 2002-06-21 이형도 마이크로 스피커의 자기회로
KR100477261B1 (ko) * 2002-02-15 2005-03-18 삼성전기주식회사 스피커 및 스피커 제조방법
US20040105568A1 (en) * 2002-12-03 2004-06-03 Po-Hsiung Lee Speaker with enhanced magnetic flux

Also Published As

Publication number Publication date
US20040197005A1 (en) 2004-10-07
CN1531370A (zh) 2004-09-22
US7151840B2 (en) 2006-12-19
CN100359990C (zh) 2008-01-02
ATE409397T1 (de) 2008-10-15
EP1460881A2 (de) 2004-09-22
ATA4182003A (de) 2005-12-15
EP1460881A3 (de) 2007-04-11
AT414196B (de) 2006-10-15
DE502004008108D1 (de) 2008-11-06
JP2004282761A (ja) 2004-10-07
DK1460881T3 (da) 2009-01-26

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