EP0077228A2 - Transducteur électroacoustique - Google Patents

Transducteur électroacoustique Download PDF

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Publication number
EP0077228A2
EP0077228A2 EP82401685A EP82401685A EP0077228A2 EP 0077228 A2 EP0077228 A2 EP 0077228A2 EP 82401685 A EP82401685 A EP 82401685A EP 82401685 A EP82401685 A EP 82401685A EP 0077228 A2 EP0077228 A2 EP 0077228A2
Authority
EP
European Patent Office
Prior art keywords
casing
diaphragm
electroacoustic transducer
coil
inner surfaces
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.)
Granted
Application number
EP82401685A
Other languages
German (de)
English (en)
Other versions
EP0077228A3 (en
EP0077228B1 (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
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 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; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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 twitter speaker and other normal speakers, a handset for telephone, a headphone, microphone units and the like.
  • a speaker comprising a voice coil attached to a top end portion opposite to a front opening portion of a corn-shaped diaphragm and an electromagnetic driving section disposed so as to make a magnetic circuit at fine gaps in said voice coil wherein when a voice signal is sent to said voice coil, the voice coil is driven vertically in concert therewith and said.corn-shaped diaphragm emits a sound output.
  • the thus constructed speaker is defective in that since the diaphragm per se is corn-shaped the unit inevitably gets large-sized and thick as a whole, further it is inferior in vibration-proof, and still further the diaphragm has a tendency of vibrating sectionally in a high pitched tone area, whereby voice can not be reproduced with high fidelity.
  • the inventor of this invention has proposed the electroacoustic transducer illustrated in Fig. 1 as the electroacoustic transducer capable of eliminating the aforegoing defects.
  • This prior art electroacoustic transducer comprises printing coils 23 on both end portions and floatingly supports, a convexly curved sheet diaphragm 22 by means of permanent magnets 24 and 25 disposed adjacent to each coil 23 in a casing 21, wherein when an electric current is applied to each coil 23 an electromagnetic force exerted on each coil 23 displaces both end portions of said diaphragm along its surface, thereby causing its central curved portion to displace to dotted places in the perpendicular direction relative to the diaphragm surface for producing a sound, and this sound is emitted to the outside.
  • This electroacoustic transducer designed as above, is capable of doubling the amount of displacement of the central curved portion of the diaphragm 22 as compared to that of each end portion thereof. Therefore, this electroacoustic transducer is advantageous in that despite use of a plane drive, it has a wide directivity, it can be made thin as a whole and further it has a superiority in producing a low sound.
  • said electroacoustic transducer is disadvantageous in that since electromagnetic driving sections must be provided at both end portions of the diaphragm 22, there is required a wide printing area for the coil 23, the number of permanent magnets needed is four and thus a number of parts are required, whereby it is difficult to make it small-sized as a whole and the use is limited thereby.
  • an electroacoustic transducer including a casing having an opening portion; a sheet diaphragm disposed in said casing and extending from said opening portion side to its opposite side, in which one end thereof is formed as a fixed end and fixed in the casing, the other end thereof is formed as a free end supported floatingly in the casing, a curved portion is formed in the middle of the fixed and free ends and a coil is provided in the vicinity of the free end; and permanent magnets arranged opposite relative to the coil of this diaphragm in the casing.
  • said object can be achieved by providing an electroacoustic transducer which comprises arranging a pair of sheet diaphragms with curved portions symmetrically in a casing, overlapping the portions adjacent to their rear edge portions into one layer, forming one of the front and rear edges into a fixed end and the other into a free end, providing a coil in the vicinity of said free end, and disposing permanent magnets at the positions opposite to coils attached to the inner surfaces of upper and lower walls of the casing.
  • said object can be achieved by providing an electroacoustic transducer which comprises connecting both side edges of a curved plate of a diaphragm to inner surfaces of both side walls of a casing by means of a flexible material-made free edge member.
  • Figs. 2 to 5 illustrate a first embodiment of the electroacoustic transducer according to this invention respectively.
  • reference numeral 1 denotes a casing including upper and lower walls 7 and 8, side walls 9 and 10; and an opening portion 6-at the front edge, wherein a pair of upper and lower diaphragms 2 are disposed symmetrically.
  • each diaphragm 2 comprises a printed plate having thereon formed a rectangular and circular coil 3 by applying a copper foil on about the half (the right half in Fig. 5) of the surface of a properly flexible synthetic resin sheet 11 and subjecting the same to chemical etching.
  • This coil 3 may be formed on the surface of sheet 11 in another way than the above mentioned.
  • the diaphragm 2 As illustrated in Fig. 2, its front edge 12 opposite to the coil 3 is fixed in the inner surface of each of the upper and lower walls 7 and 8 of the casing 1 in the vicinity of the opening portion 6.
  • the portions which contain coil 3 and which are adjacent to the rear edges overlap each other so that the coils 3 of both diaphragms 2 are connected to have a plus terminal and a minus terminal in common.
  • the thus overlapped rear edge 13 is supported movably in the horizontal direction (the right and left directions in Fig. 3) by a holding member 14 erected on the inner surface of the lower wall 8.
  • the diaphragm 2 has curved portions 15 formed in the middle of front edges 12 and the coil 3, and consequently, as can be seen from Fig. 3, takes the shape of the longitudinal sectional surface of a horn speaker viewed from the side.
  • the inner surfaces of the upper and lower walls 7 and 8 of the casing 1 are provided with permanent magnets 4 and 5 at places opposite to the coil 3 respectively, wherein poles S and N of the permanent magnet 4 are devised to confront poles N and S of the permanent magnet 5 and both minus terminals of the coil 3 are common and 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.
  • this electroacoustic transducer having a construction as described above, can double the amount of movement of the curved portion 15 in comparison with that of the coil 3, whereby a very satisfactory low-ranged sound reproduction can be obtained. Further, since there is no necessity of increasing the amount of movement of coil 3, the mounting area therefor may be decreased. Still further, since it is sufficient to dispose two permanent magnets 4 and 5 only at the places confronting this coil 3, the number of parts may be decreased with respect to the aforesaid prior art transducer which requires four permanent magnets. Accordingly, the electroacoustic transducer according to this invention can be markedly small-sized as a whole.
  • electroacoustic transducer in which, unlike the said embodiment, not a pair but only one diaphragm 2 is provided and only one permanent magnet is also provided. That is, this electroacoustic transducer can be made more thick and small-sized than that disclosed in_ said embodiment.
  • the electroacoustic transducer according to said embodiment is advantageous in that owing to the provision of a pair of diaphragms 2 there can be obtained a cylindrical plane wave type sound that . can release a listener from being tired with hearing as compared with a spherical wave type one.
  • both side edges 17 of the diaphragm 2- are connected with both side walls 9 and 10 by means of the free edge 18, the vibrating wave generated rearwards (to the right in Fig. 3) by the vibration of the diaphragm 2 is allowed to leak forward through the gaps between both side edges 17 of the diaphragm 2 and both side walls 9 and 10 of the casing 1 so that the normal vibrating wave may be released from the interference to be caused thereby, whereby sound reproduction can be effected correctly and readily up to the low range such as about 150 Hz and even when used as a car radio speaker the hindrance from noises outside of the car can be reduced.
  • Fig. 7 illustrates a second embodiment of the electroacoustic transducer according to this invention.
  • This embodiment is different from the first embodiment in that since a front edge 12' of a diaphragm 2' is formed in a free end and a rear edge 13' thereof is formed in a fixed end, a coil 3 is provided in the vicinity of the front edge 12', permanent magnets 4' and 5' are disposed.on the inner surfaces of upper and lower walls of a casing 1, and the rear edge 13' is 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)
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 true EP0077228A2 (fr) 1983-04-20
EP0077228A3 EP0077228A3 (en) 1983-06-01
EP0077228B1 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)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150976A3 (fr) * 1984-01-27 1987-08-26 Lawrence E. Arntson Système d'expansion de champ sonore
GB2193413A (en) * 1985-12-10 1988-02-03 Reefgrade Limited Electromechanical transducer
GB2194707A (en) * 1985-12-10 1988-03-09 Reefgrade Limited Electromechanical transducer
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
FR2851115A1 (fr) * 2003-02-10 2004-08-13 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
CN104581558A (zh) * 2013-10-22 2015-04-29 雅马哈株式会社 电声换能器
EP2866467A1 (fr) * 2013-10-22 2015-04-29 Yamaha Corporation Transducteur électroacoustique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62154276A (ja) * 1985-12-26 1987-07-09 Konishiroku Photo Ind Co Ltd 磁気シ−トの記録再生装置
WO2016110991A1 (fr) * 2015-01-09 2016-07-14 ヤマハ株式会社 Transducteur électroacoustique
WO2016110992A1 (fr) * 2015-01-09 2016-07-14 ヤマハ株式会社 Transducteur électroacoustique

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
GB256963A (en) * 1925-08-11 1927-02-24 Siemens Ag Improvements in or relating to acoustic devices
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
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
JPS5754499A (ja) * 1980-09-19 1982-03-31 Sawafuji Dainameka Kk Denjihenkansochi

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150976A3 (fr) * 1984-01-27 1987-08-26 Lawrence E. Arntson Système d'expansion de champ sonore
GB2193413A (en) * 1985-12-10 1988-02-03 Reefgrade Limited Electromechanical transducer
GB2194707A (en) * 1985-12-10 1988-03-09 Reefgrade Limited Electromechanical transducer
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
FR2851115A1 (fr) * 2003-02-10 2004-08-13 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
WO2004071128A3 (fr) * 2003-02-10 2004-09-30 Roetelzeichnung Holding A G Transducteur acoustique electrodynamique
US7426281B2 (en) 2003-02-10 2008-09-16 Rötelzeichnung Holding A.G. Electrodynamic acoustic transducer
CN104581558A (zh) * 2013-10-22 2015-04-29 雅马哈株式会社 电声换能器
EP2866467A1 (fr) * 2013-10-22 2015-04-29 Yamaha Corporation Transducteur électroacoustique
EP2869595A1 (fr) * 2013-10-22 2015-05-06 Yamaha Corporation Transducteur électroacoustique
US9106988B2 (en) 2013-10-22 2015-08-11 Yamaha Corporation Electroacoustic transducer
EP3038379A1 (fr) * 2013-10-22 2016-06-29 Yamaha Corporation Transducteur électroacoustique
US9398376B2 (en) 2013-10-22 2016-07-19 Yamaha Corporation Electroacoustic transducer
US9560453B2 (en) 2013-10-22 2017-01-31 Yamaha Corporation Electroacoustic transducer

Also Published As

Publication number Publication date
EP0077228A3 (en) 1983-06-01
DE3269415D1 (en) 1986-04-03
EP0077228B1 (fr) 1986-02-26
JPS5843091U (ja) 1983-03-23

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