EP0235991B1 - Haut-parleur à membrane conique - Google Patents

Haut-parleur à membrane conique Download PDF

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Publication number
EP0235991B1
EP0235991B1 EP87301271A EP87301271A EP0235991B1 EP 0235991 B1 EP0235991 B1 EP 0235991B1 EP 87301271 A EP87301271 A EP 87301271A EP 87301271 A EP87301271 A EP 87301271A EP 0235991 B1 EP0235991 B1 EP 0235991B1
Authority
EP
European Patent Office
Prior art keywords
dome
cone
cone loudspeaker
loudspeaker
central
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
EP87301271A
Other languages
German (de)
English (en)
Other versions
EP0235991A2 (fr
EP0235991A3 (en
Inventor
Ian Stanley White
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
Priority to AT87301271T priority Critical patent/ATE98081T1/de
Publication of EP0235991A2 publication Critical patent/EP0235991A2/fr
Publication of EP0235991A3 publication Critical patent/EP0235991A3/en
Application granted granted Critical
Publication of EP0235991B1 publication Critical patent/EP0235991B1/fr
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
    • 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

Definitions

  • This invention relates to cone loudspeakers, and is particularly concerned with improving the acoustic behaviour of such loudspeakers.
  • GB-A-2057224 describes a loudspeaker device having a diaphragm of synthetic resin plated with metal to increase its rigidity.
  • the diaphragm comprises an annular funnel-shaped cone portion and a central dome portion.
  • the dome portion is a cap of shallow curvature, preferably formed by injection moulding.
  • US-A-4531608 describes a speaker driver having a relatively stiff, lightweight diaphragm including a dome portion and a rim portion around the dome. Again, the dome portion is of shallow curvature.
  • GB-A-2113041 describes a loudspeaker driver where the diaphragm comprises a dome with an annular surround.
  • the dome is of part-spherical or parabolic shape but is not made from a hard material.
  • the surround here is part-spherical as opposed to being a cone, and it is the surround surface which is designed to act as a radiator of substantial acoustic power.
  • a cone loudspeaker comprising an annular cone and a central dome which is mechanically resistant to deformation, characterised in that the central dome is an acoustic radiator and has the outside wall thereof as it falls away from the apex at least as steep-sided as a hemisphere to enhance the axial stiffness thereof.
  • the dome is also radially stiff.
  • the shape and configuration of the central dome, and the material or materials from which it is made, are chosen to optimise the behaviour of the dome, and in particular to minimise misbehaviour in the upper end of the audio range. It is desirable that the material of the dome should have a very high stiffness to weight ratio.
  • the achievement of the desired axial stiffness of the dome, coupled with it acting as a clean radiator, is accomplished by shaping the dome with relatively steep sides.
  • the outside wall of the dome as it falls away from the apex is at least as steep-sided as a hemisphere. It has been found that a dome of substantially hemispherical shape is particularly suitable.
  • the central dome of the loudspeaker may be made as one with the voice coil former, or the dome and voice coil former could be separate, possibly with an intermediate stiffening ring.
  • the loudspeaker comprises a conventional annular cone 10 with a compliant surround 12 around its periphery.
  • a dome 14 is positioned centrally within the cone.
  • the central dome 14 is a substantially hemispherical element.
  • an integral cylindrical skirt portion 16 extends axially of the open end of the dome.
  • the cone 10 is fixed to the outside of the central dome at approximately the position where the hemispherical dome element 14 and the skirt portion 16 meet.
  • the apex of the central dome 14 here lies substantially in the plane of the outer perimeter of the cone 10. However, in other embodiments, the dome apex could lie above or below this plane.
  • a voice coil 18 is wound around the outside of the outer end of the skirt portion 16 of the central dome.
  • a central pole-piece 19 is fitted into the skirt portion 16.
  • Front and rear plates 21 a and 21 b which sandwich an annular magnet 23 are positioned outwardly of the coil.
  • Fig. 2 the voice coil 18 is shown wound on a voice-coil former 20 which is separated from the central dome 14, with the two components held together by an intermediate stiffening ring 22 which is of T-shaped cross-section with the leg of the T lying within the gap between the dome 14 and the former 20.
  • the dome 14 and coil former 20 would be manufactured as separate items.
  • the coil former 20 may be of metal or may be non-metallic.
  • the stiffening ring 22 provided around the dome 14 preferably lies approximately at the equator of the hemisphere, and either internally or externally of the dome.
  • Fig. 2 shows an arrangement with a T-shaped ring having the head of the T externally of the dome, whereas Fig. 3 shows the ring internally of the dome and bridging the gap between the dome and the former.
  • This reinforcing ring 22 is preferably of metal, for example aluminium or magnesium, and is provided to enhance the radial stiffness of the dome.
  • the central dome 14 of the loudspeaker of the present invention is a "hard" dome, designed for good behaviour acoustically. Although a wide range of materials could be used for the dome 14, it has been found that titanium and aluminium are particularly good materials for this purpose. Although the need to provide relatively steep sides for the dome has been shown in Figs. 1 to 3 as being achieved by the use of a hemispherical dome, other shapes and configurations of dome could be used. For example, as shown in Fig. 4, a more elongate dome 14', tending towards a semi-ovoid shape, could alternatively be used.
  • the dome 14 is axially stiff and mechanically strong and the dome acts as a clean radiator in its own right, without misbehaving in the upper frequency range of the audio band, for example up to about 17 kHz and preferably up to in excess of 20 kHz.
  • radial as used herein is to be understood as meaning a direction across the equator of the dome, whereas the term “axial” as used herein is to be understood as meaning the direction in which the dome vibrates in use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Claims (14)

  1. Un haut-parleur à cône comprenant un cône annulaire (10) et un dôme central (14) qui résiste mécaniquement à la déformation, caractérisé en ce que le dôme central est un élément rayonnant acoustique et sa paroi extérieure qui descend à partir du sommet a une pente au moins aussi élevée que celle d'une demi-sphère, pour renforcer sa rigidité axiale.
  2. Un haut-parleur à cône selon la revendication 1, caractérisé en ce que le dôme (14) est rigide en direction radiale.
  3. Un haut-parleur à cône selon la revendication 1 ou 2, caractérisé en ce que le dôme (14) a un rapport rigidité/masse élevé.
  4. Un haut-parleur à cône selon l'une quelconque des revendications précédentes, caractérisé en ce que le dôme (14) est en titane ou en aluminium.
  5. Un haut-parleur à cône selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le dôme (14) est en une matière plastique renforcée par des fibres.
  6. Un haut-parleur à cône selon l'une quelconque des revendications précédentes, caractérisé en ce que le dôme (14) est pratiquement hémisphérique.
  7. Un haut-parleur à cône selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le dôme (14') a une forme semi-ovoïde.
  8. Un haut-parleur à cône selon l'une quelconque des revendications précédentes, caractérisé en ce que le dôme central (14) est formé en une seule pièce avec un mandrin de bobine mobile qui comporte une partie de jupe (16) s'étendant en direction axiale à partir de l'extrémité ouverte du dôme.
  9. Un haut-parleur à cône selon la revendication 8, caractérisé en ce que le cône (10) est fixé en position adjacente à la jonction du dôme (14) et du mandrin (16).
  10. Un haut-parleur à cône selon l'une quelconque des revendications 1 à 7, caractérisé par un mandrin de bobine mobile (20) formé séparément du dôme (14), et par des moyens (22) destinés à renforcer la rigidité radiale du dôme qui relient ensemble le dôme et le mandrin.
  11. Un haut-parleur à cône selon la revendication 10, caractérisé en ce que les moyens destinés à renforcer la rigidité radiale du dôme comprennent un élément annulaire (20) qui est placé autour du dôme et du mandrin, à leur jonction.
  12. Un haut-parleur à cône selon la revendication 11, caractérisé en ce que l'élément annulaire de renfort (22) est en métal, de préférence en aluminium ou en magnésium.
  13. Un haut-parleur à cône selon la revendication 11 ou 12, caractérisé en ce que le dôme (14) est hémisphérique et l'élément annulaire de renfort (22) est placé pratiquement à l' équateur du dôme.
  14. Un haut-parleur à cône selon l'une quelconque des revendications précédentes, caractérisé en ce que la forme et la configuration du dôme et le matériau qui le constitue sont tels qu'il n'y a pas de cassure de la réponse audio au-dessous d'une fréquence d'environ 17 kHz, et de préférence au-dessous d'une fréquence d'environ 20 kHz.
EP87301271A 1986-02-14 1987-02-13 Haut-parleur à membrane conique Expired - Lifetime EP0235991B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87301271T ATE98081T1 (de) 1986-02-14 1987-02-13 Konuslautsprecher.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868603645A GB8603645D0 (en) 1986-02-14 1986-02-14 Loudspeakers
GB8603645 1986-02-14

Publications (3)

Publication Number Publication Date
EP0235991A2 EP0235991A2 (fr) 1987-09-09
EP0235991A3 EP0235991A3 (en) 1989-05-24
EP0235991B1 true EP0235991B1 (fr) 1993-12-01

Family

ID=10593050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87301271A Expired - Lifetime EP0235991B1 (fr) 1986-02-14 1987-02-13 Haut-parleur à membrane conique

Country Status (7)

Country Link
EP (1) EP0235991B1 (fr)
JP (1) JPS62248398A (fr)
AT (1) ATE98081T1 (fr)
CA (1) CA1292307C (fr)
DE (1) DE3788293T2 (fr)
ES (1) ES2048733T3 (fr)
GB (2) GB8603645D0 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES292736Y (es) * 1986-03-05 1987-03-01 Plastmetal, S.A. Altavoz dinamico para alarmas perfeccionado
EP0644706B1 (fr) * 1993-09-22 2002-08-14 Sony Corporation Système d'haut-parleur sans pavillon
DE4419249A1 (de) * 1994-06-01 1995-12-07 Nokia Deutschland Gmbh Lautsprecher
JP3555505B2 (ja) * 1999-06-16 2004-08-18 株式会社村田製作所 スピーカ
GB2359213B (en) 1999-10-29 2004-05-19 Kef Audio High frequency transducer
CN1839658B (zh) * 2003-08-22 2012-08-08 Pss比利时股份有限公司 具有复合振膜结构的扬声器
WO2005048651A1 (fr) * 2003-11-13 2005-05-26 Matsushita Electric Industrial Co., Ltd. Haut-parleur d'aigus
JP2005168001A (ja) * 2003-11-13 2005-06-23 Matsushita Electric Ind Co Ltd 高音用スピーカ
JP4878625B2 (ja) * 2006-05-24 2012-02-15 パイオニア株式会社 スピーカ装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5039925A (fr) * 1973-08-15 1975-04-12
JPS51120711A (en) * 1975-04-15 1976-10-22 Hokuto Onkyo Kk Speaker
GB1563511A (en) * 1976-03-19 1980-03-26 Harwood H Diaphragms for electroacoustic transducers
JPS5921881Y2 (ja) * 1979-07-13 1984-06-29 日立金属株式会社 磁気選別機
JPS5634297A (en) * 1979-08-29 1981-04-06 Kenzo Inoue Speaker unit
DE3163565D1 (en) * 1980-02-21 1984-06-20 Wharfedale Ltd Improvements in moving coil loudspeakers
EP0065882A3 (fr) * 1981-05-26 1983-12-21 Celestion International Limited Membranes en forme de calotte pour haut-parleurs
NL8204839A (nl) * 1982-01-04 1983-08-01 Jensen Int Inc Elektro-dynamische aandrijving voor een luidspreker en daarbij behorend membraan.
US4531608A (en) * 1982-10-29 1985-07-30 Heinz Harro K High frequency compression driver
GB8325298D0 (en) * 1983-09-21 1983-10-26 Tannoy Ltd Direct radiator loudspeaker
GB2160741B (en) * 1984-04-24 1988-04-27 Wharfedale Loudspeaker Moving-coil loudspeaker drive unit

Also Published As

Publication number Publication date
ES2048733T3 (es) 1994-04-01
GB2186761B (en) 1989-11-08
DE3788293D1 (de) 1994-01-13
GB2186761A (en) 1987-08-19
GB8703315D0 (en) 1987-03-18
EP0235991A2 (fr) 1987-09-09
EP0235991A3 (en) 1989-05-24
ATE98081T1 (de) 1993-12-15
JPS62248398A (ja) 1987-10-29
CA1292307C (fr) 1991-11-19
DE3788293T2 (de) 1994-06-23
GB8603645D0 (en) 1986-03-19

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