EP0065883A2 - Membrane en forme d'anneau pour haut-parleurs - Google Patents

Membrane en forme d'anneau pour haut-parleurs Download PDF

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Publication number
EP0065883A2
EP0065883A2 EP82302712A EP82302712A EP0065883A2 EP 0065883 A2 EP0065883 A2 EP 0065883A2 EP 82302712 A EP82302712 A EP 82302712A EP 82302712 A EP82302712 A EP 82302712A EP 0065883 A2 EP0065883 A2 EP 0065883A2
Authority
EP
European Patent Office
Prior art keywords
former
radiating element
annular
ring radiator
coil
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Withdrawn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
EP82302712A
Other languages
German (de)
English (en)
Other versions
EP0065883A3 (fr
Inventor
Graham Bank
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.)
CELESTION INTERNATIONAL Ltd
Original Assignee
CELESTION INTERNATIONAL Ltd
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 CELESTION INTERNATIONAL Ltd filed Critical CELESTION INTERNATIONAL Ltd
Publication of EP0065883A2 publication Critical patent/EP0065883A2/fr
Publication of EP0065883A3 publication Critical patent/EP0065883A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • H04R9/045—Mounting

Definitions

  • This invention relates to an improved construction of loudspeaker which incorporates what is known as a ring radiator.
  • Loudspeakers which incorporate a ring radiator have an annular diaphragm which is held clamped at both its inner and outer peripheries and which is. vibrated by the movements of a coil which is coupled to the diaphragm.
  • ring radiator for a loudspeaker comprises a diaphragm element formed as an annulus having generally horizontal inner and outer webs and a substantially V-shaped valley zone between them.
  • the inner and outer webs are rigidly clamped by support washers.
  • a separate tubular former carries the coil windings.
  • Conventional practice has been to secure the wound former to the apex of the valley zone of the diaphragm by means of an adhesive using a butt joint.
  • the tubular former is sometimes provided with a tongue,to provide an increased surface area for adhesive contact with the diaphragm.
  • This conventional form of construction has a number of disadvantages. Firstly, it is a relatively fragile construction, relying as it does upon a butt joint to secure the wound former to the diaphragm. Secondly, with this form of construction the former has to be wound first with the coil, and this delicate combination then has to be brought up to the diaphragm and secured thereto. This involves handling problems and the possibility of damage to the components. It is also not easy to wind the coil on to the tubular former. Furthermore, it has also been found that with this form of construction the response characteristics often include undesirable resonances, primarily due to poor coupling between the coil and the diaphragm through the butt joint.
  • a ring radiator for a loudspeaker comprising a radiating element having annular inner and outer portions, and a former carrying a coil and positioned radially substantially at the junction of said inner and outer portions, wherein said former is integral with at least one of said inner and outer portions.
  • the coil former is formed integrally with one of said inner and outer portions and the other said portion is secured to said one portion, preferably by an adhesive lap joint.
  • the element which constitutes the coil former is provided with a circumferential lip or return at the end remote from the radiating element, in order to prevent the coil turns from becoming detached.
  • a method of making a ring radiator for a loudspeaker which comprises the steps of producing a tubular former integrally with at least a portion of an annular radiating element, and thereafter winding a coil on said former.
  • the coil is wound on the former and then the wound component is secured to a further portion of the radiating element, for example by means of an adhesive lap joint.
  • the method of construction in accordance with the present invention, and the product produced thereby, has considerable advantages as compared with the conventional arrangement.
  • the ring radiator of the present invention is tough and robust, and is much less liable to damage than the conventional radiator. Additionally, because of the direct coupling of the coil to the radiating element one achieves a much smoother response, without the undesirable resonances which characterise conventional ring radiators. Furthermore, the winding of the coil is greatly simplified with the form of construction of the present invention, resulting in more consistent performance, less wastage, and ease of handling with automated assembly machinery.
  • the ring radiator of the present invention is particularly suitable for loudspeakers which operate within a frequency range of 2KHz to 16 KHz, although these frequencies are not to be taken as being limiting frequencies.
  • FIG. 1 of the drawings is a schematic sectional view through just one side of the ring radiator, the section through the diametrically opposite side being the same.
  • the diaphragm element 10 is formed as an annulus having generally horizontal inner and outer webs 10a and 10b respectively and a substantially V-shaped valley zone.
  • the inner and outer webs 10a and 10b are rigidly clamped by support washers 12.
  • a separate tubular former 14 carries the coil windings 16.
  • Conventional practice has been to secure the wound former to the apex of the valley zone of the diaphragm 10 by means of an adhesive using a butt joint as indicated at 18.
  • the tubular former 14 is sometimes provided with a tongue, indicated in broken lines at 20, to provide an increased surface area for adhesive contact with the diaphragm 10.
  • the annular radiator here comprises an outer annular portion 22, and an inner annular portion 24. Clamping washers 26 are shown for each radiator portion, but these are optional.
  • the outer annular portion 22 comprises a horizontal web or limb 22a, a sloping limb 22b and an upturned tongue 22c.
  • the inner annular portion 24 comprises a horizontal limb 24a, a sloping limb 24b, and, integrally therewith, a portion 24c which constitutes a tubular former for the windings of a coil 28.
  • the tubular portion 24c has a flange or return 24d which serves as a seat for one end of the coil windings to prevent turns of the coil from becoming detached.
  • the one annular radiator portion 24 is first produced by a suitable shaping process.
  • the coil 28 is then wound on that element 24, using the flange 24d as a stop.
  • the other, outer annular portion 22 of the radiator is then presented to the wound element so that the tongue 22c makes a lap joint with the face of the sloping limb 24b of the element 24.
  • a suitable adhesive is used between the two parts to give a strong joint. It will be appreciated that because one has surface-to-surface contact here, as compared with point contact in many of the conventional arrangements, one can achieve much better adhesion and a more reliable joint.
  • the material of the ring radiator of the present invention may be any suitable material, for example bake- lised cloth, aluminium, a plastics material, etc.
  • portion 24c which constitutes the former on which the coil is wound is integral with the radially inner portion of the radiator, it could alternatively be made integral with the radially outer portion 22 of the radiator. Alternatively, it could be made integral with both portions 22 and 24 of the radiator, in which case no separate jointing steps would be necessary.
EP82302712A 1981-05-26 1982-05-26 Membrane en forme d'anneau pour haut-parleurs Withdrawn EP0065883A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8116061 1981-05-26
GB8116061 1981-05-26

Publications (2)

Publication Number Publication Date
EP0065883A2 true EP0065883A2 (fr) 1982-12-01
EP0065883A3 EP0065883A3 (fr) 1984-01-11

Family

ID=10522060

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302712A Withdrawn EP0065883A3 (fr) 1981-05-26 1982-05-26 Membrane en forme d'anneau pour haut-parleurs

Country Status (2)

Country Link
EP (1) EP0065883A3 (fr)
GB (1) GB2099659A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1145770A3 (fr) * 2000-04-14 2002-01-02 Tokin Corporation Générateur de vibrations multifonctionnel apte à supprimer un fonctionnement instable près d'une fréquence de résonance
US7635941B2 (en) * 2002-05-20 2009-12-22 New Transducers Limited Transducer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2425433A (en) * 2005-04-19 2006-10-25 Merry Electronics Co Ltd Power-tolerant assembly of sound ring and loudspeaker diaphragm

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB301437A (en) * 1919-11-18 1928-11-27 Adrain Francis Sykes Improvements in electrodynamic loudspeakers
US2019878A (en) * 1933-01-16 1935-11-05 Magnavox Co Diaphragm spider
GB619882A (en) * 1946-08-08 1949-03-16 British Thomson Houston Co Ltd Improvements in and relating to louspeaker units

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB301437A (en) * 1919-11-18 1928-11-27 Adrain Francis Sykes Improvements in electrodynamic loudspeakers
US2019878A (en) * 1933-01-16 1935-11-05 Magnavox Co Diaphragm spider
GB619882A (en) * 1946-08-08 1949-03-16 British Thomson Houston Co Ltd Improvements in and relating to louspeaker units

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1145770A3 (fr) * 2000-04-14 2002-01-02 Tokin Corporation Générateur de vibrations multifonctionnel apte à supprimer un fonctionnement instable près d'une fréquence de résonance
US7635941B2 (en) * 2002-05-20 2009-12-22 New Transducers Limited Transducer

Also Published As

Publication number Publication date
EP0065883A3 (fr) 1984-01-11
GB2099659A (en) 1982-12-08

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

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PUAL Search report despatched

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18D Application deemed to be withdrawn

Effective date: 19841228

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BANK, GRAHAM