EP0988775B1 - Transducteur de vibrations pour haut-parleur resonant en forme de panneau, et haut-parleur equipe dudit transducteur - Google Patents

Transducteur de vibrations pour haut-parleur resonant en forme de panneau, et haut-parleur equipe dudit transducteur Download PDF

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Publication number
EP0988775B1
EP0988775B1 EP98920643A EP98920643A EP0988775B1 EP 0988775 B1 EP0988775 B1 EP 0988775B1 EP 98920643 A EP98920643 A EP 98920643A EP 98920643 A EP98920643 A EP 98920643A EP 0988775 B1 EP0988775 B1 EP 0988775B1
Authority
EP
European Patent Office
Prior art keywords
panel
vibration exciter
voice coil
exciter
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.)
Expired - Lifetime
Application number
EP98920643A
Other languages
German (de)
English (en)
Other versions
EP0988775A1 (fr
Inventor
Denis Morecroft
Neil Harris
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.)
NVF Tech Ltd
Original Assignee
New Transducers Ltd
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=10812062&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0988775(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Publication of EP0988775A1 publication Critical patent/EP0988775A1/fr
Application granted granted Critical
Publication of EP0988775B1 publication Critical patent/EP0988775B1/fr
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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/066—Loudspeakers using the principle of inertia
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2440/00—Bending wave transducers covered by H04R, not provided for in its groups
    • H04R2440/05—Aspects relating to the positioning and way or means of mounting of exciters to resonant bending wave panels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion

Definitions

  • the invention relates to loudspeakers. More particularly, but not exclusively, the invention relates to electrodynamic vibration exciters for resonant panel-form loudspeakers of the kind in which bending wave energy is imparted to the resonant panel to produce an acoustic output.
  • loudspeakers are described in our International application WO97/09842.
  • a vibration exciter for exciting a resonant loudspeaker panel needs a form of fixture onto the panel surface allowing the best possible conversion of driver power into bending waves.
  • An inertial reaction exciter applies a push/pull force to the panel by reacting against the inertia of the exciter mass. Only the motor element is rigidly attached to the panel and the ideal fixture where the panel has a cellular core and skin layers is a small single position contact that is larger than the cell size of the panel core and with a stronger attachment than the core-to-skin bond strength of the panel.
  • U.S. 4,514,599 describes an exciter for driving a vehicle trim panel for such as a rear parcel shelf.
  • an elastic member is provided between the trim panel and a dish-shaped plate coupled to the voice coil.
  • the elastic member has three legs facing the dish-shaped plate.
  • DE 2 434 005 describes a piezoelectric transducer in which the passive element has a plurality of projection for evenly supporting the active member.
  • a vibration exciter for imparting bending wave energy to a resonant panel comprising a tubular voice coil assembly having a circular end shape for coupling directly to the panel, characterised in that the tubular voice coil assembly comprises an array of at least three castellations spaced around the circumference of the voice coil assembly at its end for coupling to the panel at a plurality of discrete coupling positions.
  • the discrete coupling positions may be spaced round a circle which may conveniently correspond to the end shape of a conventional tubular voice coil former.
  • the discrete coupling positions may be created by notching or castellating the end of the voice coil former or may be formed by a mounting member to which the voice coil is attached.
  • the effect of this is that the contact area is reduced and the originally enclosed circumference contact is opened to allow distributed mode bending waves in the panel to pass under the exciter area.
  • a significant consequence of this is that the exciter 'sees' a resistive mechanical load extending to higher frequencies.
  • the most mechanically stable configuration is three equally spaced castellations and this is confirmed by mathematical modelling. Changing the contact patch shape from segments of circumference to straight lines further increases the modal input to the panel. For convenience, generally circular contact patches may be employed.
  • Additional contact between the exciter and the panel may be provided by a centrally disposed diametrically extending member, e.g. of cruciform shape, positioned within the basic triangular array.
  • an acoustic device (1) of the kind described in International patent application WO97/09842 comprising an acoustic member (2) in the form of a resonant panel to which bending wave energy is applied by a vibration exciter (not shown) to cause the panel (2) to resonate to produce an acoustic output.
  • the vibration exciter may comprise a moving coil electrodynamic motor having a voice coil directly attached to a face of the panel (2).
  • Annulus or ring (3) is intended to represent the contact area or 'footprint' of the voice coil, or at least the tubular former on which the coil is wound, on the face of the panel (2).
  • this method of attachment which is intended to maintain the inertia of the voice coil at a minimum in the interests of efficiently transmitting bending wave energy to the panel, introduces a secondary effect, which we know as the "aperture effect” in which maximum frequency response of the panel is related to the diameter of the ring or annulus (3) formed by the joint between the exciter and the panel (2).
  • the aperture effect in which maximum frequency response of the panel is related to the diameter of the ring or annulus (3) formed by the joint between the exciter and the panel (2).
  • the portion of the panel within the ring or annulus (3) can exhibit a secondary resonance, which we know as the "cap" resonance.
  • the present invention seeks at least to mitigate occurrence of the aperture effect and/or cap resonance.
  • the present invention provides mounting arrangements for vibration exciters (4) (see Figures 3 and 6) on resonant panels (2) such that the resonant behaviour of the panel (2) is not interrupted or is less so than is the case with the mounting footprint of the arrangement of Figure 1.
  • Figure 2 shows a contact area or footprint for an exciter on the panel in the form of a circular array (5) of discrete contact patches (6).
  • the basic requirement for stability is met by three contact patches forming a triangle, but in the present embodiment there are eight contact patches for increased strength.
  • the exciter (4) is an inertial device of the general kind shown in Figure 11b of International patent application WO97/09842 and has a voice coil (11) comprising a coil wound on a cylindrical former, one axial end of which voice coil (11) being drivingly mounted on the panel (2) to impart bending wave energy into the panel, and a magnet assembly (12,13,14) surrounding the voice coil (11) and comprising a magnet (12) sandwiched between a pole piece (13) which fits inside the voice coil (11) and a second pole piece (14) in the form of a cap which surrounds the voice coil, the magnet assembly and the voice coil being connected by a resilient suspension (15) which also serves the function of a dust excluder.
  • a voice coil (11) comprising a coil wound on a cylindrical former, one axial end of which voice coil (11) being drivingly mounted on the panel (2) to impart bending wave energy into the panel
  • a magnet assembly (12,13,14) surrounding the voice coil (11) and comprising a magnet (12) sandwiched between a pole piece
  • An axial end (16) of the voice coil (11) is supported on the panel in a generally annular mounting member (9) which may be a plastics moulding.
  • the end (16) of the voice coil may be attached to the mounting member (9) by means of an adhesive or alternatively the mounting member may be directly moulded onto the voice coil.
  • a side (17) of the mounting member facing away from the exciter (4) is formed with a series of short castellations or projections (10) extending away from the side (17) and disposed to form an annular array, the end faces (18) of the castellations (10) forming the array of discrete contact patches (6) which together define the footprint of the exciter (4) on the panel (2).
  • the exciter may be secured to the panel by means of adhesive applied to the end faces (18) of the mounting member (9).
  • Figure 4 is generally similar to that of Figures 2 and 3 with the exceptions that the number of discrete contact patches (6) in the array (5a) is increased and in addition the area defined by the circular array (5a) is occupied by a centrally disposed additional contact (19) in the form of a cross member in the interests of improving the coupling between the exciter and the panel.
  • the cross shape of the contact (19) is chosen since it is radially discontinuous, that is to say it does not form a closed figure and thus does not substantially adversely affect the bending wave behaviour of the panel as may be the case with the continuous ring footprint of Figure 1.
  • Figures 5 and 6 show an alternative embodiment of the invention which is very similar to that of Figures 2 and 3 as modified by the embodiment of Figure 4.
  • the contact array (Sb) is modified in that the solid cross-like additional contact (19) of Figure 4 is replaced by a cross-like array (20) of discrete contact patches (21), further to reduce any interference to the bending wave behaviour of the resonant panel (2) due to the exciter mounting.
  • Division of the driving contact is thus a means for improving termination of the mechanical junction between the exciter and the panel. It may be adjusted by design to tune the upper frequency properties of the panel radiation to match the characteristics of the panel chosen. Thus simple castellation may be chosen to couple from as few as three points with a contact area sufficient to reliably bond the exciter to the panel surface. Different configurations of contact geometry provide further scope for fine tuning this interface where in some cases the several factors of contact area, glue bond, panel loss, aperture effect and cap resonance may interact with each other.
  • the invention thus provides a simple method of reducing aperture and/or cap effects in fixing vibration exciters to resonant panels. While the invention has been particularly described with reference to moving coil exciters, it will be appreciated that the method can be applied also to other (non-voice-coil) type exciters to achieve the same benefits.

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)

Abstract

On décrit un excitateur ou transducteur (4) de vibrations qui s'utilise pour communiquer une énergie vibrationnelle de flexion à un panneau résonant (2), ledit excitateur (4) étant adapté pour être couplé audit panneau à une série de positions discrètes (6) formant un réseau triangulaire.

Claims (11)

  1. Excitateur de vibration (4) pour communiquer l'énergie des ondes de vibration à un panneau résonnant (3), comprenant :
       un gabarit de bobine tubulaire (9, 10, 11, 16) ayant une forme d'extrémité circulaire pour le couplage direct au panneau,
       caractérisé en ce que le gabarit de bobine mobile tubulaire (9, 10, 11, 16) comprend un ensemble (5) d'au moins trois créneaux (10) disposées autour de la circonférence du gabarit de bobine mobile à son extrémité pour coupler le panneau à une pluralité de positions discrètes de couplage (6).
  2. Excitateur de vibration (4) selon la revendication 1, dans lequel l'ensemble (5) comprend exactement trois positions discrètes (6) disposées également autour de la circonférence d'un cercle.
  3. Excitateur de vibration (4) selon la revendication 1 ou la revendication 2, comprenant au moins une position de couplage supplémentaire (9, 20, 21) positionnée au centre dans l'ensemble (5).
  4. Excitateur de vibration (4) selon la revendication 4, dans lequel la position de couplage supplémentaire (19, 20) est de forme cruciforme.
  5. Excitateur de vibration (4) selon la revendication 4, dans lequel la forme cruciforme (19, 20) comprend un ensemble de positions discrètes de couplage (21).
  6. Excitateur de vibration (4) selon l'une quelconque des revendications précédentes, comprenant un élément de montage (9) formé avec les créneaux (10) définissant les positions discrètes de couplage.
  7. Excitateur de vibration (4) selon la revendication 6, dans lequel l'élément de montage (9) a une forme annulaire.
  8. Excitateur de vibration (4) selon la revendication 6 ou la revendication 7, comprenant un moteur électrodynamique de bobine mobile (11), et dans lequel l'élément de montage est fixé à la bobine mobile.
  9. Excitateur de vibration (4) selon l'une quelconque des revendications précédentes, dans lequel l'excitateur est un dispositif inertiel.
  10. Haut-parleur comprenant un excitateur de vibration (4) selon l'une quelconque des revendications précédentes.
  11. Haut-parleur selon la revendication (10), comprenant un élément acoustique sous la forme d'un panneau résonnant.
EP98920643A 1997-05-10 1998-05-06 Transducteur de vibrations pour haut-parleur resonant en forme de panneau, et haut-parleur equipe dudit transducteur Expired - Lifetime EP0988775B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9709438.7A GB9709438D0 (en) 1997-05-10 1997-05-10 Loudspeaker transducer
GB9709438 1997-05-10
PCT/GB1998/001316 WO1998052383A1 (fr) 1997-05-10 1998-05-06 Transducteur de vibrations pour haut-parleur resonant en forme de panneau, et haut-parleur equipe dudit transducteur

Publications (2)

Publication Number Publication Date
EP0988775A1 EP0988775A1 (fr) 2000-03-29
EP0988775B1 true EP0988775B1 (fr) 2001-09-19

Family

ID=10812062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98920643A Expired - Lifetime EP0988775B1 (fr) 1997-05-10 1998-05-06 Transducteur de vibrations pour haut-parleur resonant en forme de panneau, et haut-parleur equipe dudit transducteur

Country Status (21)

Country Link
EP (1) EP0988775B1 (fr)
JP (1) JP2002505813A (fr)
KR (1) KR20010012364A (fr)
CN (1) CN1255278A (fr)
AR (1) AR012678A1 (fr)
AT (1) ATE205993T1 (fr)
AU (1) AU734941B2 (fr)
BR (1) BR9809609A (fr)
CA (1) CA2290103A1 (fr)
CO (1) CO4780082A1 (fr)
DE (1) DE69801755T2 (fr)
DK (1) DK0988775T3 (fr)
ES (1) ES2164423T3 (fr)
GB (1) GB9709438D0 (fr)
HK (1) HK1024134A1 (fr)
ID (1) ID20950A (fr)
IL (1) IL132587A0 (fr)
PT (1) PT988775E (fr)
TW (1) TW381404B (fr)
WO (1) WO1998052383A1 (fr)
ZA (1) ZA983836B (fr)

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US9264004B2 (en) 2013-06-12 2016-02-16 Bongiovi Acoustics Llc System and method for narrow bandwidth digital signal processing
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US10820883B2 (en) 2014-04-16 2020-11-03 Bongiovi Acoustics Llc Noise reduction assembly for auscultation of a body
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Also Published As

Publication number Publication date
ES2164423T3 (es) 2002-02-16
PT988775E (pt) 2002-03-28
EP0988775A1 (fr) 2000-03-29
AU734941B2 (en) 2001-06-28
DK0988775T3 (da) 2002-01-07
ZA983836B (en) 1999-01-25
TW381404B (en) 2000-02-01
CN1255278A (zh) 2000-05-31
CA2290103A1 (fr) 1998-11-19
GB9709438D0 (en) 1997-07-02
AU7343698A (en) 1998-12-08
KR20010012364A (ko) 2001-02-15
JP2002505813A (ja) 2002-02-19
BR9809609A (pt) 2000-07-04
WO1998052383A1 (fr) 1998-11-19
ID20950A (id) 1999-04-01
IL132587A0 (en) 2001-03-19
ATE205993T1 (de) 2001-10-15
CO4780082A1 (es) 1999-05-26
HK1024134A1 (en) 2000-09-29
DE69801755D1 (de) 2001-10-25
AR012678A1 (es) 2000-11-08
DE69801755T2 (de) 2002-05-29

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