EP0444034A1 - Electrodynamic transducer structure - Google Patents

Electrodynamic transducer structure

Info

Publication number
EP0444034A1
EP0444034A1 EP89906865A EP89906865A EP0444034A1 EP 0444034 A1 EP0444034 A1 EP 0444034A1 EP 89906865 A EP89906865 A EP 89906865A EP 89906865 A EP89906865 A EP 89906865A EP 0444034 A1 EP0444034 A1 EP 0444034A1
Authority
EP
European Patent Office
Prior art keywords
edge
diaphragm
air gap
voice coil
transducer
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Withdrawn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
EP89906865A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0444034A4 (en
Inventor
William Neal House
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 Inc
Original Assignee
Harman International Industries Inc
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 Inc filed Critical Harman International Industries Inc
Publication of EP0444034A4 publication Critical patent/EP0444034A4/en
Publication of EP0444034A1 publication Critical patent/EP0444034A1/en
Withdrawn legal-status Critical Current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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • 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
    • 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

  • This invention relates to electrodynamic transducer structures and particularly to a structure which integrates the voice coil with the diaphragm of such a transducer. This permits the implementation of designs which avoid the need for a voice coil form.
  • the transducers of the listed patents typically include voice coils wound on voice coil forms with the forms in turn attached to their respective diaphragm, or include voice coils applied to flat diaphragms.
  • the former of these technologies results in moving masses which include the voice coil form mass and the mass, e.g., adhesive mass, associated with whatever technique is used to attach the voice coil form to the diaphragm.
  • the latter of these technologies results in diaphragms which may have excessive flexibilities, or, if designed for reduced flexibilities, excessive masses, for optimum performance, particularly at low frequencies.
  • the one edge lying adjacent the air gap is generally circular.
  • the one edge is the short edge.
  • the other edge coupled to the ring may be generally elliptical, and said other edge is the long edge.
  • Fig. 4 illustrates a sectional side elevational 5 view of another transducer constructed according to the present invention
  • a voice coil 120 is applied directly to a region of the surface of diaphragm 114 which lies within the air gap 118, thereby avoiding the need for a voice coil form.
  • Voice coil 120 surrounds the center pole 122 of the permanent magnet assembly 101.
  • a centering spider 124 is provided, with the centering spider 124 being attached, for example, by a suitable adhesive, at its radially inner extent to diaphragm 114 adjacent the voice coil 120 location.
  • the radially outer region of spider 124 is attached, again, illustratively, by a suitable adhesive, to frame 112.
  • diaphragm 214 can experience a transition in shape between its inner circular edge 228 which lies within air gap 218 and its outer edge 216 which, as previously noted, can be elliptical or some other desired shape, diaphragm 214 may not be a body of rotation about axis 226 for its full extent between edges 228 and 216. It should also be noted that the illustrated section of the air gap 218 conforms generally to the section of the diaphragm 214 in the region of its inner circular edge 228. In this case, the section of air gap 218 is defined by two generally elliptical arcs. A conventional dust cap reduces the likelihood of contamination entering the air gap 218 from the front of transducer 200. In the embodiment of the invention illustrated in Fig.
  • a transducer 500 includes a permanent magnet and frame assembly 501.
  • the transducer diaphragm 514 flares outwardly toward its outer circular edge 516.
  • Outer edge 516 can be other than circular, such as, for example, elliptical.
  • the inner extent of diaphragm 514 extends directly into the air gap 518 formed by the permanent magnet and frame assembly 501 and a voice coil 520 is applied directly to a region of the surface of diaphragm 514 which lies within the air gap 518, thereby avoiding the need for a voice-coil form.
  • diaphragm 614 extends directly into the air gap 618 formed by the permanent magnet assembly 601 and a voice coil 620 is applied directly to a region of the surface of diaphragm 614 which lies within the air gap 618, thereby avoiding the need for a voice coil form.
  • Voice coil 620 surrounds the center pole 622 of the permanent magnet assembly 601.
  • a centering spider 624 is provided, with the centering spider 624 being attached, for example, by a suitable adhesive, at its radially inner extent to diaphragm 614 adjacent the voice coil 620 location.
  • the radially outer region of spider 624 is attached, again, illustratively, by a suitable adhesive, to permanent magnet assembly 601.
  • y is the vertical coordinate of a point on a surface of diaphragm 614
  • x is the corresponding horizontal coordinate on the surface
  • a is an appropriate constant.
  • segment of a two dimensional curve is intended to encompass a straight line segment.
  • plastic films metallized on one side can be stacked or laminated together to provide multi-layer coils for increased BL product.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP89906865A 1988-10-03 1989-05-31 Electrodynamic transducer structure Withdrawn EP0444034A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25183688A 1988-10-03 1988-10-03
US251836 1988-10-03

Publications (2)

Publication Number Publication Date
EP0444034A4 EP0444034A4 (en) 1991-06-28
EP0444034A1 true EP0444034A1 (en) 1991-09-04

Family

ID=22953618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89906865A Withdrawn EP0444034A1 (en) 1988-10-03 1989-05-31 Electrodynamic transducer structure

Country Status (5)

Country Link
EP (1) EP0444034A1 (ja)
JP (1) JPH04500890A (ja)
AU (1) AU3756989A (ja)
DK (1) DK59291D0 (ja)
WO (1) WO1990004317A1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4130460A1 (de) * 1991-09-13 1993-03-18 Nokia Deutschland Gmbh Elektromagnetischer wandler
US5446797A (en) * 1992-07-17 1995-08-29 Linaeum Corporation Audio transducer with etched voice coil
JP3011826B2 (ja) * 1993-02-02 2000-02-21 株式会社ケンウッド スピーカ
IT1296539B1 (it) * 1997-11-06 1999-07-09 Macklaine Di Francesco Di Summ Altoparlante a bobina mobile.
US8620017B2 (en) 2005-11-15 2013-12-31 Pioneer Corporation Speaker and magnetic circuit
JP4699878B2 (ja) * 2005-11-18 2011-06-15 パイオニア株式会社 スピーカ
JP2023121437A (ja) * 2022-02-21 2023-08-31 アルプスアルパイン株式会社 スピーカ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358089A (en) * 1964-06-10 1967-12-12 Gen Electric Magnet assembly
US3935400A (en) * 1974-02-28 1976-01-27 Trio Kabushiki Kaisha Oval dome type speaker
DE3331657A1 (de) * 1983-09-02 1985-03-21 Canton Elektronik GmbH & Co, 6395 Weilrod Lautsprecher

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1487376C3 (de) * 1965-07-16 1975-01-16 N.V. Philips' Gloeilampenfabrieken, Eindhoven (Niederlande) Verfahren zum Verbinden der Membran, Schwingspulenkörper und gegebenenfalls Zentriermitteln elektrodynamischer Wandler
GB1563511A (en) * 1976-03-19 1980-03-26 Harwood H Diaphragms for electroacoustic transducers
DE3163565D1 (en) * 1980-02-21 1984-06-20 Wharfedale Ltd Improvements in moving coil loudspeakers
GB2083973A (en) * 1980-09-04 1982-03-31 B & L Loudspeakers Ltd Loudspeaker diaphragms
US4376233A (en) * 1980-12-18 1983-03-08 Sony Corporation Securing of lead wires to electro-acoustic transducers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358089A (en) * 1964-06-10 1967-12-12 Gen Electric Magnet assembly
US3935400A (en) * 1974-02-28 1976-01-27 Trio Kabushiki Kaisha Oval dome type speaker
DE3331657A1 (de) * 1983-09-02 1985-03-21 Canton Elektronik GmbH & Co, 6395 Weilrod Lautsprecher

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9004317A1 *

Also Published As

Publication number Publication date
AU3756989A (en) 1990-05-01
JPH04500890A (ja) 1992-02-13
DK59291A (da) 1991-04-03
EP0444034A4 (en) 1991-06-28
WO1990004317A1 (en) 1990-04-19
DK59291D0 (da) 1991-04-03

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19910402

AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19920602