EP0263748A1 - Elektroakustischer Wandler - Google Patents

Elektroakustischer Wandler Download PDF

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Publication number
EP0263748A1
EP0263748A1 EP87402186A EP87402186A EP0263748A1 EP 0263748 A1 EP0263748 A1 EP 0263748A1 EP 87402186 A EP87402186 A EP 87402186A EP 87402186 A EP87402186 A EP 87402186A EP 0263748 A1 EP0263748 A1 EP 0263748A1
Authority
EP
European Patent Office
Prior art keywords
enclosure
electro
acoustic transducer
transducer according
loudspeaker
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
EP87402186A
Other languages
English (en)
French (fr)
Other versions
EP0263748B1 (de
Inventor
Philippe Lanternier
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
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
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
    • 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.
  • the present invention aims to remedy these drawbacks by providing a solution that is both exceptional in terms of reproduction fidelity and comfort in listening to sounds, remarkable in simplicity inducing not only an astonishing value for money, but also excellent ability to integrate into the environment.
  • an electro-acoustic transducer consisting of an enclosure in the form of a revolution around an axis, each end of which is closed by a loudspeaker, the two loudspeakers being mounted back to back.
  • one of the loudspeakers is powered by a source of electrical energy, in this sense said loudspeaker is active, while the other loudspeaker is passive in that it receives no electrical power, its movement resulting from the rear wave of the active speaker.
  • the support of the two speakers is advantageously made of a flexible material avoiding any resonance for the rear wave and any diffraction for the front wave.
  • the support is made of such or such flexible material which will depend more on criteria of economy or aesthetics: one can, indeed, consider just as well supports in corrugated cardboard, as in fiber or in compact material or even leather and even woven material.
  • 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.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Electromechanical Clocks (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
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
FR8613948 1986-10-07
FR8613948A FR2604845B1 (fr) 1986-10-07 1986-10-07 Transducteur electro-acoustique

Publications (2)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0827677A1 (de) * 1995-03-31 1998-03-11 BSG Laboratories, Inc. Kompaktes breitbandlautsprechersystem
GB2587412A (en) * 2019-09-27 2021-03-31 William Eikos Ltd Sound projection apparatus

Families Citing this family (11)

* 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
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978941A (en) * 1975-06-06 1976-09-07 Curt August Siebert Speaker enclosure
US4169516A (en) * 1976-04-26 1979-10-02 Ichiro Honda Speaker system
GB2101448A (en) * 1981-06-02 1983-01-12 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

Family Cites Families (10)

* 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
JPS5644148Y2 (de) * 1976-01-19 1981-10-15
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
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978941A (en) * 1975-06-06 1976-09-07 Curt August Siebert Speaker enclosure
US4169516A (en) * 1976-04-26 1979-10-02 Ichiro Honda Speaker system
GB2101448A (en) * 1981-06-02 1983-01-12 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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0827677A1 (de) * 1995-03-31 1998-03-11 BSG Laboratories, Inc. Kompaktes breitbandlautsprechersystem
EP0827677A4 (de) * 1995-03-31 2001-03-28 Bsg Lab Inc Kompaktes breitbandlautsprechersystem
GB2587412A (en) * 2019-09-27 2021-03-31 William Eikos Ltd Sound projection apparatus
GB2587412B (en) * 2019-09-27 2021-10-13 William Eikos Ltd Sound projection apparatus

Also Published As

Publication number Publication date
US4905788A (en) 1990-03-06
DE3785289D1 (de) 1993-05-13
JPS63160498A (ja) 1988-07-04
EP0263748B1 (de) 1993-04-07
FR2604845B1 (fr) 1989-06-16
FR2604845A1 (fr) 1988-04-08
OA08763A (fr) 1989-03-31
RU1838895C (ru) 1993-08-30
DE3785289T2 (de) 1993-11-11
CN87107784A (zh) 1988-07-06
ATE88047T1 (de) 1993-04-15
KR880005822A (ko) 1988-06-30
JP2726047B2 (ja) 1998-03-11

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