EP0362068B1 - Elektrodynamisch-fluidische Wandlerausrüstung für einen pneumatischen Lautsprecher - Google Patents

Elektrodynamisch-fluidische Wandlerausrüstung für einen pneumatischen Lautsprecher Download PDF

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Publication number
EP0362068B1
EP0362068B1 EP89402667A EP89402667A EP0362068B1 EP 0362068 B1 EP0362068 B1 EP 0362068B1 EP 89402667 A EP89402667 A EP 89402667A EP 89402667 A EP89402667 A EP 89402667A EP 0362068 B1 EP0362068 B1 EP 0362068B1
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EP
European Patent Office
Prior art keywords
support
moveable
order
transducer
elastomer
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
EP89402667A
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English (en)
French (fr)
Other versions
EP0362068A1 (de
Inventor
Ferdinand Pollet
Jean Julia
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.)
Bertin Technologies SAS
Original Assignee
Bertin et Cie SA
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Publication date
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Application filed by Bertin et Cie SA filed Critical Bertin et Cie SA
Priority to AT89402667T priority Critical patent/ATE91371T1/de
Publication of EP0362068A1 publication Critical patent/EP0362068A1/de
Application granted granted Critical
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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
    • H04R9/045—Mounting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/42—Combinations of transducers with fluid-pressure or other non-electrical amplifying means

Definitions

  • the invention relates to a movable assembly for the mixed electrodynamic and fluidic transducer of a pneumatic loudspeaker, comprising an axially movable tubular support, one end of which carries the voice coil in the annular air gap of the electrodynamic stage of the transducer, and whose l the other end forms a movable spout in the neck of an annular constriction of the fluid stage of the transducer, the middle part of said support being sandwiched between two concentric membranes separating the electrodynamic and fluid stages of the transducer.
  • Patents FR-A-2,442,565 and 2,572,615 are known to the pneumatic loudspeaker in which the mobile assembly with an electromagnetic coil is extended by a fluid modulator constituted by a spout which moves in the passage of the flow of air. The movement, controlled by the electrodynamic transducer which receives the voice input signal, modulates the air flow and gives rise to an amplified sound signal compared to the input signal.
  • the quality of reproduction of the sound signal depends, as in any loudspeaker, on the quality of the transducer, that is to say on the inertia and the rigidity of the moving equipment.
  • the spout In a pneumatic loudspeaker of the type described above, the spout must be particularly rigid in order to be able to withstand the pressure of the fluid that it is supposed to control while the mobile assembly of which the modulating spout is part must have low inertia. These two qualities are antagonistic, so we have chosen, because of the efforts generated by the air flow to be controlled, to favor rigidity.
  • the solution therefore consisted in the use of a thick coil support, which resulted in a relatively large air gap and for a magnet of given dimensions, less intensity of the magnetic flux passing through the transducer coil.
  • the bandwidth and performance of such transducer were unsatisfactory also the invention set itself the aim of improving these characteristics.
  • the result of the invention was, inter alia, to stiffen the moving element by using the other elements of the transducer and in particular the annular elastic membrane so that said membrane acts as a hoop.
  • the moving element is characterized in that said support, which has a diameter of an order of magnitude greater than its height, itself of an order of magnitude greater than its thickness, is stiffened by the aforementioned membranes, each formed of a composite hoop including between the support and a concentric rigid crown, an elastomer ring adhering thereto which has an axial height of the same order of magnitude as its radial thickness, on the one hand ensuring the elastic return of the support in axial displacement and on the other hand maintain the circularity and therefore the flatness of said support.
  • FIG. 1 a distinction is made on either side of a wall 1: on one side, the fluidic stage 2 and, on the other side, the electrodynamic stage of the transducer 3.
  • the entire fluid stage 2 comprises a nozzle 4 extended by an acoustic horn 5, this nozzle 4 delimiting with a profiled diffuser 6, an annular duct 7 comprising a neck 8 in the plane of which is disposed an annular spout 9.
  • a cylindrical collector 10 is supplied uniformly from a capacity 11 comprising orifices 12 regularly distributed at its base, said capacity 11 being supplied by an intake duct 13.
  • the movable spout 9 (see also Figure 2) is formed by the end 17A of the tubular support forming the movable assembly and is connected to the wall 1 by a continuous elastic membrane 22.
  • This wall has an outer ring 23 and an inner ring 24 fixed by screws to the transducer 3.
  • the spout 9 controls the modulation of the advantageously sonic air flow passing through the neck of the fluidic stage.
  • the transducer 3 conventionally consists of a permanent magnet 14 and the pole pieces 31, 32 delimiting an annular air gap 16 in which the movable assembly 17 of the electromagnetic coil moves axially.
  • the transducer is housed in a housing 25 fixed to the entire pneumatic circuit.
  • this movable assembly 17 comprises an annular support 17A, for example, of glass fibers / epoxy, having on its external surface a notch 17B in the form of a flattened groove whose bottom is coated with adhesive (for example of the epoxy type).
  • adhesive for example of the epoxy type.
  • the turns of the winding 18 are wound without any noticeable projection relative to the external surface of the support 17A.
  • the assembly is then coated externally with a smooth layer of glue (for example a resin of ethoxyline type) embedding said turns and forming a support / integral winding assembly.
  • the mobile assembly of the transducer is clamped between two concentric membranes, each formed of a composite hoop consisting of a rigid crown 23 or 24 and an elastomer ring 22.
  • the elastomer rings are molded in situ between the support and rigid crowns and adhering to it.
  • In situ molding ensures efficient hooping of the moving assembly.
  • the shape of the rings and in particular the dimensions of their cross section and the choice of the stiffness of the elastomer ensure a high resonance frequency of the moving element.
  • the elastomer works essentially in shear and by taking the dimensions of the section of the rings of the same order of magnitude, the stresses are distributed as well as possible and the appropriate axial stiffness is obtained, that is to say of the order of 300 to 1000 N / mm.
  • the elastomer being incompressible, the ring-ring assembly behaves like a double hoop which prohibits any defect in circularity and consequently prevents any deformation of the plane defined by the spout.
  • the width of the air passage, defined between the throat of the nozzle and the nozzle of the crew remains constant over the entire circumference for a given position of the crew.
  • the thickness of the spout 9 is reduced over at least part 17A of the end of the support forming said spout.
  • annular stop 35 made of elastomer.
  • the purpose of this stop is to prevent damage to the spout caused by possible contact between the edge of the spout and the wall of the nozzle and due to excessive dynamics or to suction by the sonic air flow.
  • the support shown in Figure 3, is separated in two parts by a middle flange 17D: the winding of the electromagnetic transducer is housed between said flange 17D and an end flange 17C while the spout 9 is formed by the thinned end of part 17A.
  • the ends 18 of the winding are connected by conductive braids 21 to the supply terminals 19 ( Figure 2) which receive the electrical signal from an amplification chain of a sound or other signal.
  • notches 33 (FIG. 2) which are diametrical, the bottom of which is pierced with a cylindrical hole 34 halfway through the ring.
  • the tube is made of the same material as that provided for the molding of the rings.
  • the notches which are also filled with elastomer provide greater flexibility to the electrical connection.
  • the free part of the braid, extending diametrically from the crown, is fixed by known means on the terminals 19.
  • the transducer unit has the following dimensions: inside diameter of the support: # 102 mm; ring height: # 16 mm; thickness of the part forming the modulation spout: # 1.5 mm.
  • the large diameter of the support is made necessary by the large fluid flow rate, of the order of several tens of grams per second under pressures of 2 to 3 bars, which passes through the fluid amplifier.
  • the support is particularly flexible and its retention in a conventional thin membrane cannot result in sufficient stiffening.
  • the in situ molding of thick elastomer rings, secured to the outer and inner rings and the support, ensures effective hooping of the latter.
  • the width of the rings is at least of the same order of magnitude as their thickness and, according to an exemplary embodiment, of the thickness of the crowns (approximately 4 mm).
  • the molding product used is a commercial silicone elastomer, vulcanizing at room temperature, with a Shore A hardness of the order of 40, in a temperature range of -70 ° to + 200 ° C. This temperature range is chosen so that the material retains its hardness characteristics and therefore there is no change in the characteristics of the loudspeaker regardless of variations in the surrounding temperature or the temperature of the material. air supplied to the pneumatic circuit.
  • the great stiffness of the chosen elastomer ensures a high resonant frequency, hence a relatively wide bandwidth and an interesting signal / noise ratio, that is to say of the order of 30 to 40 dB.
  • the resonant frequencies can be chosen by varying the section of the rings and / or the hardness of the elastomer.
  • the resonance frequency is 1200 Hz.
  • the pneumatic loudspeaker comprising a mobile assembly in accordance with the invention, allows the passage of a frequency band of 5 KHz which guarantees a very good understanding of speech.

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)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Reciprocating Pumps (AREA)

Claims (7)

  1. Mobile Ausrüstung für den elektrodynamisch-fluidischen Wandler eines pneumatischen Lautsprechers mit einem axial beweglichen rohrförmigen Lager (17), von dem ein Ende eine mobile Spule (18) im ringförmigen Luftspalt (16) der elektrodynamischen Stufe des Wandlers trägt und von dem das andere Ende eine bewegliche Nase (9) in der Verengung eines ringförmigen Durchlasses der fluidischen Stufe des Wandlers bildet, wobei der Mittelteil des Lagers zwischen zwei konzentrische Membranen (22) eingespannt ist, die die elektrodynamische und fluidische Stufe des Wandlers voneinander trennen, dadurch gekennzeichnet, daß das Lager (17), das einen Durchmesser in einer über seiner Höhe liegenden Größenordnung und eine Höhe in einer über seiner Dicke liegenden Größenordnung aufweist, durch die erwähnten Membranen (22) versteift ist, wobei jede Membran durch ein zusammengesetztes Band gebildet ist, das zwischen dem Lager (17) und einer steifen konzentrischen Einfassung (23, 24) einen daran haftenden Elastomerring (22) einschließt, der eine axiale Höhe in der gleichen Größenordnung wie seine radiale Dicke aufweist, um einerseits die elastische Rückstellung des Lagers bei einer Axialverschiebung sicherzustellen und andererseits die Kreisförmigkeit und somit die Ebenheit des Lagers aufrechtzuerhalten.
  2. Ausrüstung nach Anspruch 1, dadurch gekennzeichnet, daß die besagten Elastomerringe (22) in situ zwischen dem Lager (17) und den Einfassungen (23, 24) unter Halterung durch geeignete Schablonen geformt sind.
  3. Mobile Ausrüstung nach Anspruch 2, dadurch gekennzeichnet, daß das Elastomer ein bei Raumtemperatur vulkanisierbares Silikon ist.
  4. Mobile Ausrüstung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß das Elastomer eine Shore A-Härte in einer Größenordnung von 40 in einem Temperaturbereich von -70 bis 200 °C aufweist.
  5. Mobile Ausrüstung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß das Elastomer zwei nachgiebige Rohre einschließt, die sich durch das Lager (17) und die äußere Einfassung (23) erstrecken, um den Durchgang von Anschlüssen (21) der beweglichen Spule (18) zu ermöglichen.
  6. Mobile Ausrüstung nach Anspruch 5, dadurch gekennzeichnet, daß die Einfassung (23) rechts von jedem Anschluß (21) einen mit Elastomer gefüllten Ausschnitt (33) aufweist, über den sich das Rohr erstreckt.
  7. Mobile Ausrüstung nach Anspruch 1, dadurch gekennzeichnet, daß ein ringförmiges Widerlager (35) aus Elastomer in dem Teil der Düse (4) vorgesehen ist, die der beweglichen Nase (9) gegenüberliegt.
EP89402667A 1988-09-29 1989-09-28 Elektrodynamisch-fluidische Wandlerausrüstung für einen pneumatischen Lautsprecher Expired - Lifetime EP0362068B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89402667T ATE91371T1 (de) 1988-09-29 1989-09-28 Elektrodynamisch-fluidische wandlerausruestung fuer einen pneumatischen lautsprecher.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8812734 1988-09-29
FR8812734A FR2637148B1 (fr) 1988-09-29 1988-09-29 Equipage transducteur electrodynamique-fluidique pour haut-parleur pneumatique

Publications (2)

Publication Number Publication Date
EP0362068A1 EP0362068A1 (de) 1990-04-04
EP0362068B1 true EP0362068B1 (de) 1993-07-07

Family

ID=9370526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402667A Expired - Lifetime EP0362068B1 (de) 1988-09-29 1989-09-28 Elektrodynamisch-fluidische Wandlerausrüstung für einen pneumatischen Lautsprecher

Country Status (9)

Country Link
US (1) US5179595A (de)
EP (1) EP0362068B1 (de)
JP (1) JPH04500893A (de)
KR (1) KR900702745A (de)
AT (1) ATE91371T1 (de)
DE (1) DE68907460T2 (de)
ES (1) ES2044176T3 (de)
FR (1) FR2637148B1 (de)
WO (1) WO1990003708A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2697396A1 (fr) * 1992-10-28 1994-04-29 Bernard Francis Enceinte acoustique au son omnidirectionnel et au son soufflé par air.
US10631093B2 (en) * 2015-01-26 2020-04-21 Harman International Industries, Incorporated Vented loudspeaker system with duct for cooling of internal components
US9571935B2 (en) * 2015-01-26 2017-02-14 Harman International Industries, Inc. Loudspeaker with ducts for transducer voice coil cooling

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073916A (en) * 1958-11-24 1963-01-15 Muter Company Blast-proof water-proof loudspeaker
US3674945A (en) * 1970-03-11 1972-07-04 Raytheon Co Acoustic impedance matching system
US4055233A (en) * 1975-12-22 1977-10-25 Electronic Engineering Co. Of California Ear coupler
FR2442565A1 (fr) * 1978-11-24 1980-06-20 Bertin & Cie Procede d'amplification acoustique fluide et haut parleur pneumatique de mise en oeuvre de ce procede
FR2572615B1 (fr) * 1984-10-29 1988-10-14 Bertin & Cie Haut-parleur pneumatique a debit continu de fluide sous pression
US4696045A (en) * 1985-06-04 1987-09-22 Acr Electronics Ear microphone

Also Published As

Publication number Publication date
DE68907460D1 (de) 1993-08-12
EP0362068A1 (de) 1990-04-04
DE68907460T2 (de) 1994-03-03
FR2637148B1 (fr) 1991-06-07
JPH04500893A (ja) 1992-02-13
FR2637148A1 (fr) 1990-03-30
US5179595A (en) 1993-01-12
WO1990003708A1 (fr) 1990-04-05
ES2044176T3 (es) 1994-01-01
KR900702745A (ko) 1990-12-08
ATE91371T1 (de) 1993-07-15

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