EP0331566B1 - Zylindrischer Akustischer Wellenleiter - Google Patents

Zylindrischer Akustischer Wellenleiter Download PDF

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Publication number
EP0331566B1
EP0331566B1 EP89400530A EP89400530A EP0331566B1 EP 0331566 B1 EP0331566 B1 EP 0331566B1 EP 89400530 A EP89400530 A EP 89400530A EP 89400530 A EP89400530 A EP 89400530A EP 0331566 B1 EP0331566 B1 EP 0331566B1
Authority
EP
European Patent Office
Prior art keywords
orifice
waveguide
waveguide according
outlet
fact
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
EP89400530A
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English (en)
French (fr)
Other versions
EP0331566A1 (de
Inventor
Christian Heil
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.)
L Acoustics SAS
Original Assignee
Heil Acoustics
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9363735&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0331566(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Heil Acoustics filed Critical Heil Acoustics
Publication of EP0331566A1 publication Critical patent/EP0331566A1/de
Application granted granted Critical
Publication of EP0331566B1 publication Critical patent/EP0331566B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • 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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers

Definitions

  • the present invention relates to the optimization of acoustic couplings between neighboring electroacoustic transducers, over the whole extent of their frequency spectrum, by means of a particular waveguide.
  • the purpose of this waveguide is to transform an isophase circular plane wave surface (loudspeaker membrane or compression chamber outlet) into an isophase rectangular plane wave surface.
  • the alignment of several rectangular surfaces thus formed constitutes an isophase flat ribbon from which a coherent cylindrical progressive wave can emerge.
  • Several transducers thus coupled generate a coherent cylindrical wave while these same transducers without the waveguide of the invention generate as many spherical traveling waves interfering with each other.
  • the sound waveguide has a circular or annular input and a rectangular output so that the propagation time of the wave between input and output is constant, whatever the acoustic path taken.
  • the conduit between the inlet orifice and the outlet area has a passage evoking the general shape of a sheet.
  • the so-called sheet form is obtained by deformation of the walls of the conduit or by incorporation of one or more bodies internal to the conduit, or both by deformation of the walls of the conduit and by incorporation of one or more bodies internal to said conduit.
  • the small internal body has various shapes and is made up of several elements.
  • This body may have the general appearance of a flattened pyramid, or of a flattened cone, the point of which penetrates into the entry orifice, and the other end of which is bevelled so that its edge is flush with the outlet area of the conduit along the axis of said outlet.
  • the diffuser is designed to work with several speakers and several waveguides.
  • the oblong areas of the outlet orifices are all in one plane and in line with one another.
  • the waveguide shown "in Fig. 1 is made up of three elements 1, 2, 3.
  • Elements 1 and 2 are symmetrical along a vertical plane and constitute shells between which the internal body 3 is fixed.
  • Each shell has a rear flange 4 or 4 ′ and a front flange 6 or 6 ′ joined by a spacer plate 5 or 5 ′,
  • the flanges 4-4 ′ coming in extension of one another, and it is the same for the flanges 6, 6 ′ which leave between them a slot 9 formed by the notches 8, 8 ′.
  • the hollow parts 7 and 7 ′ form a housing for the element 3.
  • the rear flanges 4,4 ′ have a small circular notch 10 10 ′ facing each other after assembly to determine the inlet orifice 11.
  • Fig. 4 shows the case of a guide provided for loudspeaker with compression chamber, and the orifice 11, of a relatively small surface area, reveals the tip 12 of the internal body 3 which will be described later in detail.
  • Fig. 5 shows the case of a waveguide provided for a speaker with an annular diaphragm.
  • the orifice 11 ′ has a larger surface area than in the previous case.
  • Fig. 6 shows the front flange 6 and 6 ′ with their notch 8, 8 ′ determining the slot 9 leaving the body 3 ending on this side with an edge 14.
  • Figs. 2 and 3 we see a waveguide fixed on a loudspeaker 15 and provided with a horn 16.
  • a continuous passage bearing the references 16 to 18 ′. This passage surrounds the body 3 on all sides, and has an almost constant width.
  • the internal body 3 has the general shape of a cone 19, the base of which is bevelled to half its height to determine two areas 20, 21 determining the edge 14.
  • the body 3 is fixed by any known means.
  • Fig. 9 we see a single tongue 22, but there is a symmetrical tongue, and during assembly the two tongues are sandwiched between the plates 5 and 5 ′.
  • the waveguide is made of rigid material (metal, plastic, resin) by molding. As explained above, it consists of three parts, the central part is sandwiched between two identical external parts which determine the walls of the waveguide and include the flanges for fixing to the loudspeaker at the entrance, at flag at the exit. These three parts are assembled by gluing, welding or screwing.
  • the shapes of the internal body and of the housing are such that all the shortest paths from the inlet to the outlet are all the same length, or very similar lengths.
  • the propagation time of the sound wave is constant through the guide.
  • the said waveguide makes it possible to transform the circular isophase wave plane generated by the membrane of a loudspeaker or the orifice of a compression chamber into a rectangular isophase wave plane.
  • the dimensions of the rectangular plane in question are calibrated so that the emerging sound wave propagates in quasi-cylindrical mode.
  • the stacking of several loudspeakers with waveguides in the height direction, the L side being vertical has the effect of generating a flat isophase ribbon from which a coherent cylindrical wave can emerge. Optimal coupling between the speakers is thus achieved.

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Claims (11)

  1. Wellenleiter zur Übertragung akustischer Wellen vorbestimmter minimaler Länge (λ₂), der mit dem Ausgang eines elektroakustischen Wandlers zusammenpaßt und einen ununterbrochenen Durchgang aufweist, der stromaufwärts einen Einlaß, der das dem Wandler nächstgelegene Ende des Wellenleiters bildet, mit einem Auslaß stromabwärts verbindet, der das entgegengesetzte Ende des Wellenleiters bildet, dadurch gekennzeichnet, daß die Einlaßöffnung (11,11') eine Kreis- oder Ringform aufweist, die Auslaßöffnung durch eine rechteckige ebene und längliche Öffnung (9) gebildet ist, der Durchgang (16, 17, 18, 18') diese Öffnungen miteinander verbindet und die vom Wandler ausgesandten Wellen führt, und dadurch, daß dreidimensional die Wellenwege in dem Durchgang zwischen jedem Punkt der Einlaßöffnung stromaufwärts und jedem Punkt der Auslaßöffnung stromabwärts praktisch gleich lang sind, so daß der Wellenleiter eine am Einlaß kreisförmige und gleichphasige ebene Wellenfläche in eine am Auslaß rechteckige und gleichphasige ebene Wellenfläche überführt.
  2. Wellenleiter nach Anspruch 1, dadurch gekennzeichnet, daß die Maximalabweichung (δ) zwischen den möglichen unterschiedlichen akustischen Wegen zwischen der Einlaßöffnung und der Auslaßöffnung in dem Leiter derart ist, daß gilt: δ ≦ λ₂/4, wobei λ₂ die Länge der kleinsten übertragenen Welle ist.
  3. Wellenleiter nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Breite der ebenen und länglichen Auslaßöffnung kleiner oder gleich der Länge der kleinsten übertragenen Welle (λ₂) ist.
  4. Wellenleiter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß er eine Außenschale (1,2) aufweist, innerhalb der ein Innenkörper (3) derart angeordnet ist, daß zwischen seiner Außenfläche und der Innenfläche der Außenschale der besagte ununterbrochene Durchgang zur Übertragung der Wellen freigelassen ist.
  5. Wellenleiter nach Anspruch 4, dadurch gekennzeichnet, daß er aus drei Elementen gebildet ist, daß die zwei ersten Elemente (1, 2) bezüglich einer vertikalen Ebene symmetrisch sind und äußere Halbschalen bilden, zwischen denen der Innenkörper (3) befestigt ist, wobei jede Schale einen hinteren Flansch (4 oder 4') und einen vorderen Flansch (6 oder 6') aufweist, die durch eine Zwischenplatte (5 oder 5') verbunden sind, die teilweise verformt ist, um die Aufnahme für das Innenelement (3) festzulegen.
  6. Wellenleiter nach Anspruch 5, dadurch gekennzeichnet, daß die hinteren Flansche (4 und 4') in gegenseitiger Verlängerung angeordnet sind und jeder derselben einen kreisförmigen Ausschnitt (10, 10') aufweist, wobei diese Ausschnitte nach dem Zusammenbau einander zugewandt sind, um die Einlaßöffnung (11) festzulegen.
  7. Wellenleiter nach Anspruch 6, dadurch gekennzeichnet, daß die vorderen Flansche (6 und 6') je einen rechteckigen Ausschnitt (8, 8') aufweisen, wobei diese Ausschnitte nach dem Zusammenbau einander zugewandt sind, um die Auslaßöffnung (9) festzulegen.
  8. Wellenleiter nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß der Innenkörper in einem horizontalen Axialschnitt die Form eines Vierecks, das zu einer Achse symmetrisch ist, die zwischen einer Spitze des Körpers, die in der Fläche der kreisförmigen Einlaßöffnung im Mittelpunkt des Kreises liegt, und einer Kante verläuft, die parallel zur Auslaßöffnung ausgerichtet ist und in der Fläche der letzteren liegt, und in einem vertikalen Axialschnitt eine Dreieckform aufweist.
  9. Wellenleiter nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß der Innenkörper in einem horizontalen Axialschnitt eine geometrische Form mit fünf geraden Seiten, die zu einer Achse symmetrisch ist, die zwischen dem Mittelpunkt der Kreise, welche die ringförmige Einlaßöffnung bilden, und einer Kante des besagten Körpers verläuft, die sich vertikal erstreckt und in der Fläche der Auslaßöffnung liegt, und in einem vertikalen Axialschnitt eine trapezförmige Gestalt aufweist, deren große Basis durch die besagte Kante gebildet ist und deren kleine Basis dem Durchmesser der ringförmigen Einlaßöffnung entspricht.
  10. Wellenleiter nach einem der Ansprüche 8 und 9, dadurch gekennzeichnet, daß der Innenkörper (3) im Inneren der Außenschale mittels Laschen (22) befestigt ist, die parallel zu seiner Achse verlaufen und es zulassen, ihn in einem gleichmäßigen Abstand zu den Innenwänden der Außenschale zu halten, um den besagten nicht unterbrochenen Durchgang zu bilden.
  11. Diffusor mit mehreren Wellenleitern nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Wellenleiter in einer Linie (jeder am Ausgang eines elektroakustischen Wandlers) so montiert sind, daß sich die rechteckigen Flächen der Auslaßöffnungen (9) alle in derselben Ebene und in einer gegenseitigen Verlängerung befinden.
EP89400530A 1988-02-29 1989-02-24 Zylindrischer Akustischer Wellenleiter Expired - Lifetime EP0331566B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8802481A FR2627886B1 (fr) 1988-02-29 1988-02-29 Guide d'onde sonore cylindrique
FR8802481 1988-02-29

Publications (2)

Publication Number Publication Date
EP0331566A1 EP0331566A1 (de) 1989-09-06
EP0331566B1 true EP0331566B1 (de) 1994-06-01

Family

ID=9363735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400530A Expired - Lifetime EP0331566B1 (de) 1988-02-29 1989-02-24 Zylindrischer Akustischer Wellenleiter

Country Status (5)

Country Link
US (1) US5163167A (de)
EP (1) EP0331566B1 (de)
DE (1) DE68915582T2 (de)
ES (1) ES2054041T3 (de)
FR (1) FR2627886B1 (de)

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CN103428603B (zh) * 2012-05-16 2016-04-27 顾康 一种可调角度的高频声波导向槽
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DE102013010570B4 (de) * 2013-06-25 2023-01-05 KSdigital GmbH Schalltransformator und Lautsprecher
EP2922050A1 (de) 2014-03-10 2015-09-23 Ciare s.r.l. Akustischer Wellenleiter
US9282398B2 (en) 2014-03-19 2016-03-08 Dana Monroe Speaker system having wide bandwidth and wide high-frequency dispersion
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CN105244019A (zh) * 2015-10-27 2016-01-13 刘善延 一种球面声波转成柱面声波的声学波导
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EP3420738B1 (de) * 2016-02-24 2019-11-27 Dolby Laboratories Licensing Corporation Planarlautsprecherverteiler für verbesserte schalldispersion
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FR3072840B1 (fr) 2017-10-23 2021-06-04 L Acoustics Arrangement spatial de dispositifs de diffusion sonore
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Also Published As

Publication number Publication date
ES2054041T3 (es) 1994-08-01
DE68915582D1 (de) 1994-07-07
EP0331566A1 (de) 1989-09-06
DE68915582T2 (de) 1995-01-19
FR2627886B1 (fr) 1994-05-13
FR2627886A1 (fr) 1989-09-01
US5163167A (en) 1992-11-10

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