EP0263748B1 - Elektroakustischer Wandler - Google Patents

Elektroakustischer Wandler Download PDF

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Publication number
EP0263748B1
EP0263748B1 EP87402186A EP87402186A EP0263748B1 EP 0263748 B1 EP0263748 B1 EP 0263748B1 EP 87402186 A EP87402186 A EP 87402186A EP 87402186 A EP87402186 A EP 87402186A EP 0263748 B1 EP0263748 B1 EP 0263748B1
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EP
European Patent Office
Prior art keywords
enclosure
loud
electro
speaker
acoustic 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.)
Expired - Lifetime
Application number
EP87402186A
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English (en)
French (fr)
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EP0263748A1 (de
Inventor
Philippe Lanternier
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Individual
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Individual
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Publication date
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Priority to AT87402186T priority Critical patent/ATE88047T1/de
Publication of EP0263748A1 publication Critical patent/EP0263748A1/de
Application granted granted Critical
Publication of EP0263748B1 publication Critical patent/EP0263748B1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/283—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
    • H04R1/2834—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm for loudspeaker transducers

Definitions

  • the present invention relates to a particularly efficient and economical electro-acoustic transducer, comprising a flexible enclosure in the form of a revolution around an axis and two loudspeakers mounted back to back in the axis of the enclosure.
  • the generally parallelepiped shape of the multi-way speakers imposes on the rear wave of the bass speaker, operating in piston, a constraint which causes a prejudicial deformation of the front wave, transmitting only the sound message.
  • this constraint on the rear wave is more or less important depending on the acoustic absorption power of the walls or the degree of sophistication of the vents or baffles intended to weaken the return of the wave.
  • patent US-A-3,978,941 which describes an acoustic enclosure in the form of a rigid cylindrical tube held vertically, comprising an active loudspeaker turned upwards and mounted 15 centimeters from the open upper end of said enclosure, the lower end of said tube having a passage opening which allows the transfer of air from inside the chamber to the outside atmosphere. Because the active speaker is enclosed in the speaker tube, edge effects appear, ruining the omnidirectionality of the diffusion of mid and treble sounds.
  • patent GB-A-2 101 448 which describes an acoustic transducer formed by a set of cylindrical chambers each comprising back to back an active speaker and a passive speaker, mounted axially at the interior of a rigid enclosure, the length of which gives each chamber a particular fundamental resonant frequency, all the chambers being able to reproduce the almost complete range of audible sounds.
  • the transducer advantageously has a cylindrical shape providing a construction convenience contributing to the economy of the system; this particular form is, moreover, entirely suited to another feature of the invention recommending the use of two strictly identical speakers in order to introduce no source of distortions of purely mechanical origin.
  • the cylindrical shape of the speaker is ideal for avoiding the edge effects well known in conventional speakers and therefore totally avoiding diffraction of sounds.
  • transducers according to the invention can be envisaged: one could for example use a passive speaker with a diameter different from that of the active speaker, or else, the enclosure could be frustoconical, or flared on one side, in hyperboloid of revolution etc ... All the tests nevertheless converge towards an optimal solution providing a cylindrical support and similar speakers.
  • the proposed transducer must be suspended vertically, the active loudspeaker being directed upwards and the passive loudspeaker towards the ground at a sufficient distance from the latter.
  • the electro-acoustic transducer consists of a first "active" loudspeaker 1, of external diameter equal to 21 cm and having, in a manner known per se, all the electromechanical arrangements allowing a strip bandwidth between 40 and 18,000 Hertz.
  • This speaker 1 is mounted on a disc 2 with a diameter equal to 25 cm.
  • This disc is preferably produced in a 19 mm thick panel made up of wood chips joined by an epoxy resin.
  • a second "passive" speaker similar to the first speaker 1 is also mounted on a disc 4 identical to the disc 2.
  • the two discs 2 and 4 which are centered on the same axis at a distance of 50 cm from each other, receive on their periphery a sheet 5, of corrugated cardboard for example, coming to wind on the two discs 2 and 4 to which it is fixed by gluing.
  • the grooves of the sheet 5 are arranged along a generatrix of the cylinder 6 thus formed.
  • the flexible wall formed by the sheet 5 is lined with a thickness of about 5 cm of rock wool or synthetic wadding 7.
  • the cylinder 6 is suspended vertically by means of two cords 8 secured to the disc 2, which hooks onto a support 9 in the form of a bracket, so that the "active" loudspeaker 1 is turned towards the ceiling.
  • the same loudspeaker 1 is supplied with power, advantageously using, for example, the cords 8 for supplying the electrical wires 8a from any sound source.
  • the loudspeaker 3 is not connected to any source and it is left free to "work” under the sole stresses of the rear wave of the "active" loudspeaker 1 thereby contributing to its suffocation and therefore to the sound reinforcement of the front wave, with which there is total overlap, at least for the low frequency register.
  • the electro-acoustic transducer thus described and in accordance with the invention, is advantageously decorated on its side wall 10 so as to better integrate into the environment.
  • This same environment also determines the optimal height of the "passive" speaker 3, relative to the ground, by considering a minimum height fixed at 30 cm, so that there is a perfect acoustic coupling between the transducer and the environment.

Claims (7)

  1. Elektroakustischer Wandler mit einer Kammer, die die Form eines Rotationskörpers bezüglich einer Achse hat und deren beide Enden jeweils durch einen Lautsprecher verschlossen sind, wobei die beiden Lautsprecher Rücken an Rücken auf der Achse der Kammer angeordnet sind und einer der Lautsprecher (1) von einer Quelle elektrischer Energie gespeist ist und in diesem Sinne als aktiv bezeichnet wird, während der andere Lautsprecher (3) passiv ist, da er keine elektrische Speisung erhält und seine Bewegung ausschließlich aus der rückwärtigen Welle des aktiven Lautsprechers (1) resultiert, dadurch gekennzeichnet, daß:
    - die Kammer (6) mit ihrer Drehachse senkrecht gehaltert ist,
    - der aktive Lautsprecher (1) oberhalb der Kammer (6) angeordnet ist,
    - die Umhüllung (5) der Kammer (6) aus einem an sich bekannten weichen Material besteht, das keiner Resonanz mit den vorderen oder hinteren Schwingungen der Lautsprecher (1, 3) fähig ist.
  2. Elektroakustischer Wandler nach Anspruch 1, dadurch gekennzeichnet, daß die Kammer durch Mittel, die nicht in der Lage sind, Schwingungen zu übertragen oder in Resonanz mit dem Wandler zu gelangen, in einer Höhe von mindestens 30 cm bezüglich des Bodens aufgehängt ist.
  3. Elektroakustischer Wandler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das weiche Material, das die Umhüllung (5) der Kammer (6) bildet, Wellpappe ist, deren Wellungen in Richtung der Erzeugenden der Kammer (6) verlaufen.
  4. Elektroakustischer Wandler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die beiden Lautsprecher (1, 3) auf starren Scheiben (2, 4) aus akustisch stark absorbierendem Einfach- oder Verbundmaterial mit einem Durchmesser, der etwas größer ist als der Durchmesser des jeweiligen Lautsprechers (1, 3) befestigt sind, um die herum das weiche Material (5) der Kammer (6) angeordnet ist.
  5. Elektroakustischer Wandler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die rotationssymmetrische Kammer (6) kegelstumpfförmig ist.
  6. Elektroakustischer Wandler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Höhe der Kammer (6) im wesentlichen gleich dem Doppelten ihres mittleren Durchmessers für ein gleiches Kammer-(6)-Volumen ist.
  7. Elektroakustischer Wandler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der aktive Lautsprecher (1) ein elektrodynamischer Breitband-Typ mit einem Durchmesser von mindestens 21 cm ist.
EP87402186A 1986-10-07 1987-10-01 Elektroakustischer Wandler Expired - Lifetime EP0263748B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87402186T ATE88047T1 (de) 1986-10-07 1987-10-01 Elektroakustischer wandler.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8613948A FR2604845B1 (fr) 1986-10-07 1986-10-07 Transducteur electro-acoustique
FR8613948 1986-10-07

Publications (2)

Publication Number Publication Date
EP0263748A1 EP0263748A1 (de) 1988-04-13
EP0263748B1 true EP0263748B1 (de) 1993-04-07

Family

ID=9339618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402186A Expired - Lifetime EP0263748B1 (de) 1986-10-07 1987-10-01 Elektroakustischer Wandler

Country Status (10)

Country Link
US (1) US4905788A (de)
EP (1) EP0263748B1 (de)
JP (1) JP2726047B2 (de)
KR (1) KR880005822A (de)
CN (1) CN87107784A (de)
AT (1) ATE88047T1 (de)
DE (1) DE3785289T2 (de)
FR (1) FR2604845B1 (de)
OA (1) OA08763A (de)
RU (1) RU1838895C (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261136B (en) * 1990-06-08 1995-02-15 Simon Paul Carrington Loudspeaker with an oscillator having a coiled tubular chamber
US5664020A (en) * 1994-01-18 1997-09-02 Bsg Laboratories Compact full-range loudspeaker system
US5450495A (en) * 1994-01-18 1995-09-12 Bsg Laboratories. Inc. Loudspeaker system
DE10015751B4 (de) * 1999-03-31 2005-11-17 Matsushita Electric Industrial Co., Ltd., Kadoma Lautsprecherbox
US6445806B1 (en) * 2000-02-08 2002-09-03 Michael L. Jacobson Tuned elastic loudspeaker enclosure
US7347276B2 (en) * 2004-08-23 2008-03-25 Tci97 Inc. Adjustable garden tool
US20070251759A1 (en) * 2006-04-26 2007-11-01 Eric Neiman Bass speaker stand
LT5638B (lt) 2008-02-28 2010-02-25 Gintautas Sruogis Akustinė sistema
JP5449122B2 (ja) * 2010-01-02 2014-03-19 ファイナル・オーディオデザイン事務所株式会社 ドラムエアパワーシステム
DE102013009605B3 (de) * 2013-06-07 2014-06-12 Drazenko Sukalo Lautsprecherchassis mit Membran mit spiralförmigem Strömungskanal
CN111372162A (zh) * 2018-12-25 2020-07-03 深圳纽斯声学系统有限公司 一种不开洞表面安装式超薄吸顶音箱
CN109951778B (zh) * 2019-04-16 2020-12-01 陈国富 全频扬声器
GB2587412B (en) * 2019-09-27 2021-10-13 William Eikos Ltd Sound projection apparatus

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470976A (en) * 1967-12-11 1969-10-07 Procter Brevard High fidelity speaker
US3750878A (en) * 1971-11-15 1973-08-07 Dixon K Corp Electrical component testing apparatus
US3978941A (en) * 1975-06-06 1976-09-07 Curt August Siebert Speaker enclosure
JPS5644148Y2 (de) * 1976-01-19 1981-10-15
US4169516A (en) * 1976-04-26 1979-10-02 Ichiro Honda Speaker system
US4146744A (en) * 1976-09-02 1979-03-27 Bose Corporation Low q multiple in phase high compliance driver ported loudspeaker enclosure
US4284844A (en) * 1979-05-07 1981-08-18 Belles Research Corp. Loudspeaker system
JPS6019056Y2 (ja) * 1980-09-19 1985-06-08 川崎製鉄株式会社 傾斜コンベヤの原料飛散防止装置
US4420061A (en) * 1980-11-03 1983-12-13 Michael Levy Pentagonal speaker enclosure with a downward directed dynamic damping system
GB2101448B (en) * 1981-06-02 1984-10-24 Anthony Robert Taddeo Speaker system
US4417714A (en) * 1981-06-29 1983-11-29 Orrin Charm Hanging device mounting system for devices such as speaker enclosures
JPS58169786U (ja) * 1982-05-07 1983-11-12 キ−プ工業株式会社 拡声装置
US4673057A (en) * 1984-11-13 1987-06-16 Glassco John M Geometrical transducer arrangements
US4580654A (en) * 1985-03-04 1986-04-08 Hale James W Portable sound speaker system

Also Published As

Publication number Publication date
ATE88047T1 (de) 1993-04-15
OA08763A (fr) 1989-03-31
JP2726047B2 (ja) 1998-03-11
KR880005822A (ko) 1988-06-30
CN87107784A (zh) 1988-07-06
FR2604845B1 (fr) 1989-06-16
US4905788A (en) 1990-03-06
JPS63160498A (ja) 1988-07-04
DE3785289D1 (de) 1993-05-13
EP0263748A1 (de) 1988-04-13
RU1838895C (ru) 1993-08-30
FR2604845A1 (fr) 1988-04-08
DE3785289T2 (de) 1993-11-11

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