EP0077228B1 - Transducteur électroacoustique - Google Patents

Transducteur électroacoustique Download PDF

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Publication number
EP0077228B1
EP0077228B1 EP82401685A EP82401685A EP0077228B1 EP 0077228 B1 EP0077228 B1 EP 0077228B1 EP 82401685 A EP82401685 A EP 82401685A EP 82401685 A EP82401685 A EP 82401685A EP 0077228 B1 EP0077228 B1 EP 0077228B1
Authority
EP
European Patent Office
Prior art keywords
casing
diaphragm
electroacoustic transducer
edge
edges
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
Application number
EP82401685A
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German (de)
English (en)
Other versions
EP0077228A3 (en
EP0077228A2 (fr
Inventor
Tadashi Sawafuji
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0077228A2 publication Critical patent/EP0077228A2/fr
Publication of EP0077228A3 publication Critical patent/EP0077228A3/en
Application granted granted Critical
Publication of EP0077228B1 publication Critical patent/EP0077228B1/fr
Expired 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
    • H04R9/046—Construction
    • H04R9/047—Construction in which the windings of the moving coil lay in the same plane
    • 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
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers

Definitions

  • This invention relates to an electroacoustic transducer for use in a full range speaker for audio, a tweeter speaker and other normal speakers, a handset for telephone, a headphone, microphone units and the like.
  • an electroacoustic transducers is a speaker comprising a voice coil attached to a top end portion opposite to a front opening portion of a cone-shaped diaphragm with an electromagnetic driving section adapted to constitute a magnetic circuit at fine gaps in the voice coil wherein, when a voice signal is sent to the voice coil, the voice coil will be driven vertically in accordance therewith and diaphragm will produce a sound output.
  • This electroacoustic transducer illustrated in Fig. 1 as being capable of eliminating the aforementioned drawbacks.
  • This electroacoustic transducer as disclosed in JP-A-57 54 499 published 31.03. 1982 comprises a convex curved sheet like diaphragm 22 supported from end leg portions of casing 21, and having a coil 23 on the surface of the diaphragm adjacent each end, and having a pair of permanent magnets 24 and 25 at each coil 23.
  • an electric current is applied to the coils 23, an electromagnetic force will displace the surface of the diaphragm, thereby causing the central curved portion to be displaced as seen in the dotted lines, in a direction perpendicular to the diaphragm surface, thereby producing sound.
  • Such an electroacoustic transducer is capable of doubling the displacement of the central curved portion of the diaphragm 22 with respect to each end portion. Therefore, this electroacoustic transducer has a wide directivity, it is thin and further it has better low sound characteristics.
  • the electroacoustic transducer of Fig. 1 has disadvantages in that, since electromagnetic driving sections must be provided at both end portions of the diaphragm 22, a large surface area for the coils 23 is required, four permanent magnets are needed, and thus a large number of parts are required, whereby it is difficult to keep the transducer small and its applications are thereby limited.
  • an electroacoustic transducer of the type defined in the preamble of claim 1 and known from DE-B-1 251 381 which is characterized in that said diaphragm has a curved portion between said edges, and in that there is included a flexible buffer plate connected between the side edges of the diaphragm and the interior of the side walls.
  • Figs. 2 to 5 illustrate a first embodiment of the electroacoustic transducer according to this invention.
  • a casing 1 including upper and lower walls 7 and 8, side walls 9 and 10, and open portion 6 at the front of the casing, and a pair of upper and lower diaphragms being symmetrically disposed in the casing.
  • each diaphragm 2 includes a printed plate having thereon a coil 3 formed thereon by applying a copper foil on about the half (the right half in Fig. 5) of the surface of a flexible synthetic resin sheet 11 and subjecting this to chemical etching.
  • Coil 3 may be formed on the surface of sheet 11 in other well known ways.
  • the front edges 12 of diaphragms 2 opposite the coils 3 are fixed to the inner surface of the upper and lower walls 7 and 8 of casing 1 near the open portion 6.
  • the portions of the diaphragms 2 which contain coils 3 and which are adjacent to rear edge of the diaphragms overlap so that coils 3 of both diaphragms 2 are so connected to have a plus terminal and a minus terminal in common.
  • the thus overlapped rear edge 13 forms a free edge which is movably supported in the horizontal direction (the right and left directions in Fig. 3) by a holding member 14 mounted on the inner surface of the lower wall 8.
  • the diaphragms 2 have curved portions 15 between the front edges 12 and coils 3, and, as can be seen from Fig. 3, have the shape of the longitudinal sectional surface of a cone speaker viewed from the side.
  • the inner surfaces of the upper and lower walls 7 and 8 of casing 1 are provided with permament magnets 4 and 5 located opposite to coils 3, wherein poles S and N of permanent magnet 4 confront poles N and S of the permanent magnet 5, and both minus terminals of the coils 3 are connected to a signal source (not shown) such as an amplifier or the like.
  • the permanent magnets 4 and 5 are surrounded with a magnetic material 16 such as iron or the like.
  • the gaps formed between the side edges 17 at the curved portions 15 of the diaphragms 2 and the side walls 9 and 10 of casing 1 are closed by means of flexible buffer plates 18 as shown in detail in Fig. 6, wherein one side edge of the buffer plate 18 is connected to the side edge 17 of the diaphragms 2, and the other side edge of the buffer plate is connected to side walls 9 and 10.
  • the electroacoustic transducer constructed as described above can double the amount of movement of the curved portion 15 of the diaphragms in comparison with the movement of coils 3, whereby very satisfactory low-ranged sound reproduction can be obtained.
  • the area for mounting the coils may be decreased.
  • the number of parts may be decreased in comparison with the aforesaid prior art transducer which requires four permanent magnets. Accordingly, the electroacoustic transducer according to this invention can be relatively quite small.
  • electroacoustic transducers in which, unlike the above embodiment, there is provided, not a pair of diaphragms, but only a single diaphragm 2 and only one permanent magnet. This latter electroacoustic transducer would be even thinner and smaller than that described above.
  • the electroacoustic transducer according to the Figs. 2-5 is also advantageous in that with the provision of a pair of diaphragms 2, there can be obtained a cylindrical wave type sound that is not as fatiguing to the listener as a spherical wave device.
  • Fig. 7 illustrates a second embodiment of the electroacoustic transducer according to this invention.
  • This embodiment differs from the first in that front edges 12' of a diaphragm 2' are free ends and a rear edge 13' thereof is fixed, and coils 3 are disposed adjacent to the front edges 12', with permanent magnets 4' and 5' disposed on the inner surfaces of upper and lower walls of a casing 1, and the rear edge 13' being fixed by means of a holding member 14'.

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)

Claims (6)

1. Transducteur électro-acoustique comprenant une caisse (1) ayant une portion ouverte (6) dans un côté, une membrane (2) en feuille disposée dans ladite caisse et s'étendant depuis le côté de la portion ouverte jusqu'à son côté opposé, ladite membrane ayant un bord (12) fixé dans la caisse et un autre bord (13) soutenu de façon mobile dans la caisse, une bobine (3) disposée au voisinage de l'autre bord (13), des aimants permanents (4, 5) disposés adjacents à la bobine (3) de la membrane dans la caisse, la membrane (2) ayant des bords latéraux (17) et la caisse ayant des parois latérales (9, 10), caractérisé en ce que ladite membrane présente une portion incurvée (15) entre lesdits bords, et en ce qu'il est compris une plaque souple (18) d'amortissement reliée entre les bords latéraux (17) de la membrane (2) et l'intérieur des parois latérales (9, 10).
2. Transducteur électro-acoustique suivant la revendication 1, dans lequel le bord (12) de la membrane (2), fixé dans la caisse, est disposé au voisinage de la portion ouverte (6) de la caisse (1) et l'autre bord (13) soutenu de façon mobile dans la caisse, est disposé à l'opposé du bord.
3. Transducteur électro-acoustique suivant la revendication 1, dans lequel le bord (12') de la membrane (2') soutenu de façon mobile dans la caisse est disposé au voisinage de la portion ouverte de la caisse (1 et le bord (13') fixé dans la caisse, est disposé à l'opposé dudit autre bord.
4. Transducteur électro-acoustique suivant la revendication 1, dans lequel il est compris des bords arrière (13), et la membrane (2) en feuille comprend une paire d'éléments supérieur et inférieur de membrane disposés symétriquement l'un par rapport à l'autre et leurs portions adjacentes aux bord arrière sont disposées à recouvrement.
5. Transducteur électro-acoustique suivant la revendication 4, dans lequel il y a au moins deux bords avant (12) pour la paire de membranes (2) et ces bords (12) sont fixés dans les surfaces internes des parois supérieure et inférieure (7, 8) au voisinage de la portion ouverte (6) de la caisse (1), et dans lequel une bobine (3) est prévue sur les surfaces supérieure et inférieure d'une couche (11) formée au voisinage des bords arrière des membranes et dans lequel des aimants permanents (4, 5) sont agencés sur les surfaces internes des parois supérieure et inférieure (7, 8) de la caisse (1) en face de cette bobine et les bords arrière de la membrane sont soutenus de façon flottante au moyen d'un organe de retenue (14) prévu dans la caisse.
6. Transducteur électro-acoustique suivant la revendication 4, dans lequel il est prévu de bords avant (12') de la paire de membrane (15), qui sont soutenus de façon flottante au moyen d'un organe de retenue (14) prévu sur les surfaces internes des parois supérieure et inférieure (7, 8) au voisinage de la portion ouverte (6) de la caisse (1) et une bobine (3) est prévue sur une surface (11) avant face aux surfaces internes des parois supérieure et inférieure de la caisse, au voisinage des bords avant (12') des membranes (15) et dans lequel des aimants permanents (4', 5') sont agencés sur les surfaces internes des parois supérieure et inférieure (7, 8) de la caisse (1) en face de cette bobine (3) et dans lequel les bords arrière (13) de la membrane sont fixés dans un organe de retenue (14') prévu dans la caisse.
EP82401685A 1981-09-17 1982-09-16 Transducteur électroacoustique Expired EP0077228B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP13797881U JPS5843091U (ja) 1981-09-17 1981-09-17 電気音響変換器用振動板
JP137978/81U 1981-09-17

Publications (3)

Publication Number Publication Date
EP0077228A2 EP0077228A2 (fr) 1983-04-20
EP0077228A3 EP0077228A3 (en) 1983-06-01
EP0077228B1 true EP0077228B1 (fr) 1986-02-26

Family

ID=15211184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401685A Expired EP0077228B1 (fr) 1981-09-17 1982-09-16 Transducteur électroacoustique

Country Status (3)

Country Link
EP (1) EP0077228B1 (fr)
JP (1) JPS5843091U (fr)
DE (1) DE3269415D1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586192A (en) * 1984-01-27 1986-04-29 Robert B. Welch Soundstage boundary expansion system
GB2194707A (en) * 1985-12-10 1988-03-09 Reefgrade Limited Electromechanical transducer
GB2193413A (en) * 1985-12-10 1988-02-03 Reefgrade Limited Electromechanical transducer
JPS62154276A (ja) * 1985-12-26 1987-07-09 Konishiroku Photo Ind Co Ltd 磁気シ−トの記録再生装置
US5103482A (en) * 1988-07-28 1992-04-07 Fabri Conti Lucas Apparatus and method for reproducing high fidelity sound
EP0529143A3 (en) * 1991-08-30 1993-07-07 Filip Keller Diaphragm for loudspeaker or microphone
FR2851115B1 (fr) 2003-02-10 2008-01-25 Patrick Hoffmann Transducteur acoustique generant un rayonnement sonore par compression et expansion d'une masse d'air situee entre une membrane mobile et une surface fixe ou entre deux membranes mobiles
JP6048469B2 (ja) * 2013-10-22 2016-12-21 ヤマハ株式会社 電気音響変換器
JP6048470B2 (ja) 2013-10-22 2016-12-21 ヤマハ株式会社 電気音響変換器
WO2016110992A1 (fr) * 2015-01-09 2016-07-14 ヤマハ株式会社 Transducteur électroacoustique
WO2016110991A1 (fr) * 2015-01-09 2016-07-14 ヤマハ株式会社 Transducteur électroacoustique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754499A (ja) * 1980-09-19 1982-03-31 Sawafuji Dainameka Kk Denjihenkansochi

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB246099A (en) * 1925-01-15 1926-05-13 Lee De Forest Improvements in sound reproducing devices
US1638245A (en) * 1925-07-17 1927-08-09 Davis Charles Crawford Loud speaker
FR613906A (fr) * 1925-08-01 1926-12-02 Système de diaphragme acoustique
FR621452A (fr) * 1925-08-11 1927-05-12 Siemens Ag Instrument acoustique
US1866090A (en) * 1926-05-22 1932-07-05 Forest Lee De Sound reproducing device
DE464015C (de) * 1926-08-29 1928-08-14 Siemens & Halske Akt Ges Membran fuer Schallapparate
DE1251381B (fr) * 1964-06-16
JPS51135638A (en) * 1975-05-20 1976-11-24 Trio Kenwood Corp Electric acoustic changer
JPS5474417A (en) * 1977-11-26 1979-06-14 Sony Corp Multi-point driving type speaker
FR2441980A1 (fr) * 1978-11-16 1980-06-13 Audax Transducteur electro-acoustique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754499A (ja) * 1980-09-19 1982-03-31 Sawafuji Dainameka Kk Denjihenkansochi

Also Published As

Publication number Publication date
JPS5843091U (ja) 1983-03-23
EP0077228A3 (en) 1983-06-01
DE3269415D1 (en) 1986-04-03
EP0077228A2 (fr) 1983-04-20

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