EP2003927A1 - Membran für einen elektrodynamischen Wandler - Google Patents

Membran für einen elektrodynamischen Wandler Download PDF

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Publication number
EP2003927A1
EP2003927A1 EP07109967A EP07109967A EP2003927A1 EP 2003927 A1 EP2003927 A1 EP 2003927A1 EP 07109967 A EP07109967 A EP 07109967A EP 07109967 A EP07109967 A EP 07109967A EP 2003927 A1 EP2003927 A1 EP 2003927A1
Authority
EP
European Patent Office
Prior art keywords
coil
diaphragm
stabilising member
disc
substantially flat
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Withdrawn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
EP07109967A
Other languages
English (en)
French (fr)
Inventor
Ole Wolff
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.)
Ole Wolff Elektronik AS
Original Assignee
Ole Wolff Elektronik AS
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 Ole Wolff Elektronik AS filed Critical Ole Wolff Elektronik AS
Priority to EP07109967A priority Critical patent/EP2003927A1/de
Publication of EP2003927A1 publication Critical patent/EP2003927A1/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Withdrawn legal-status Critical Current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
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering

Definitions

  • This invention relates to electrodynamic transducers and in particular to electroacoustic transducers for use as speaker transducers in mobile telephones and other personal audio equipment.
  • electrodynamic transducers such as speaker transducers and microphones have a diaphragm carrying a coil with a circular cross section and a magnetic system defining an annular air gap with a radially oriented magnetic field in the air gap and the coil arranged in the air gap. Due to the curvature of circular coils such coils are relatively rigid and therefore have a relative stable shape. However, in a ring-shaped air gap the magnetic field strength varies with the radial position in the air gap and great care must therefore be taken when mounting the coil in the air gap to ensure that the coil is properly centred coaxially in the air gap. Transducers having non-circular air gaps e.g. with linear portions have a more homogeneous magnetic field and are less sensitive to having the corresponding linear or flat portions of the coil placed at a particular position in the magnetic field. However, linear or flat portions of the coil are mechanically less stable than circular coils.
  • the present invention presents a solution to this problem.
  • a stabilising member for preventing deformation of the coil.
  • a stabilising member may be applied to any coil including circular coils and coils having one or more substantially flat portions for use in a transducer with a correspondingly shaped air gap.
  • the stabilising member is provided at a transition zone between the coil and the diaphragm to provide sufficient rigidity to the coil.
  • the stabilising member can be a disc or a ring arranged within the coil.
  • a disc-shaped stabilising member has the advantage that it can be arranged within the coil with the disc and a central portion of the diaphragm in an overlaying arrangement.
  • the central portion of the diaphragm is dome shaped to impart rigidity to the central portion, while the peripheral portion must be as flexible as possible.
  • the diaphragm can be chosen primarily for its flexible properties while the disc-shaped stabilising member acts as a piston.
  • FIG 1 a transducer according to the invention.
  • the transducer has a magnetic system with a disc-shaped magnet 10 magnetised as shown in the vertical direction of the drawing.
  • a disc 11 with a generally rectangular contour in the plane perpendicular to the figure is placed on top of the magnet, and the magnet and rectangular disc are placed inside a shallow cup 12.
  • the rectangular disc and the cup are both made of a magnetically soft material such as iron.
  • the side edges of the rectangular disc and the vertical sides of the cup define a rectangular air gap 13. Together with the magnet 10 the rectangular disc 11 and the cup 12 form a magnetic circuit with a magnetic field in the air gap 13.
  • a diaphragm 14 is secured at its outer periphery to a structure 15 in solid connection to the magnetic system.
  • the diaphragm carries a coil 16 arranged in the air gap 13.
  • the coil 16 in figure 1 has a rectangular cross section with four substantially flat portions 17, 18, 19, 20, i.e. portions with essentially no curvature. Only the four corners are rounded. Such substantially flat portions with essentially no curvature tend to be unstable in shape and will easily bend, and therefore a stabilising member 21 is provided for preventing deformation of the coil.
  • the stabilising member 21 is a rectangular disc which is shown in figures 1 and 2 , but a rectangular, open frame with similar outer contour can also be used.
  • the stabilising member 21 is provided at a transition zone 22 between the coil and the diaphragm so that at least the substantially flat portions of the coil are mechanically stabilised.
  • the diaphragm 14 overlays the stabilising member 21 and the stabilising member may be secured to the coil 16 and the diaphragm 14 by any suitable method, such as gluing or welding, at the entire contacting surfaces or just at a peripheral zone of the stabilising member.
  • the disc-shaped stabilising member hereby also stabilises the portion of the diaphragm within the coil and acts like a rigid piston.
  • the corners of the stabilising member 21 may be cut as shown to leave the corners of the coil 16 without contact with the stabilising member, or the stabilising member 21 may conform to and be in contact with the entire inner periphery of the coil 16.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP07109967A 2007-06-11 2007-06-11 Membran für einen elektrodynamischen Wandler Withdrawn EP2003927A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07109967A EP2003927A1 (de) 2007-06-11 2007-06-11 Membran für einen elektrodynamischen Wandler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07109967A EP2003927A1 (de) 2007-06-11 2007-06-11 Membran für einen elektrodynamischen Wandler

Publications (1)

Publication Number Publication Date
EP2003927A1 true EP2003927A1 (de) 2008-12-17

Family

ID=38734877

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07109967A Withdrawn EP2003927A1 (de) 2007-06-11 2007-06-11 Membran für einen elektrodynamischen Wandler

Country Status (1)

Country Link
EP (1) EP2003927A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322584A (en) * 1979-06-30 1982-03-30 Pioneer Electronic Corporation Voice coil bobbin for planar diaphragm
JPS6130897A (ja) * 1984-07-23 1986-02-13 Foster Denki Kk 平面振動板スピ−カの製造方法
US20040101155A1 (en) * 2002-11-22 2004-05-27 Yen-Chen Chan Fixing disk for connecting voice coil with drum paper and retaining them in a speaker
US20060191741A1 (en) * 2005-02-25 2006-08-31 Pioneer Corporation Speaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322584A (en) * 1979-06-30 1982-03-30 Pioneer Electronic Corporation Voice coil bobbin for planar diaphragm
JPS6130897A (ja) * 1984-07-23 1986-02-13 Foster Denki Kk 平面振動板スピ−カの製造方法
US20040101155A1 (en) * 2002-11-22 2004-05-27 Yen-Chen Chan Fixing disk for connecting voice coil with drum paper and retaining them in a speaker
US20060191741A1 (en) * 2005-02-25 2006-08-31 Pioneer Corporation Speaker

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