EP0847675B1 - Vibration transducers - Google Patents

Vibration transducers Download PDF

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Publication number
EP0847675B1
EP0847675B1 EP96929393A EP96929393A EP0847675B1 EP 0847675 B1 EP0847675 B1 EP 0847675B1 EP 96929393 A EP96929393 A EP 96929393A EP 96929393 A EP96929393 A EP 96929393A EP 0847675 B1 EP0847675 B1 EP 0847675B1
Authority
EP
European Patent Office
Prior art keywords
panel
transducer
motor coil
fastener
vibration 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
EP96929393A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0847675A1 (en
Inventor
Henry Azima
Martin Colloms
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34865240&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0847675(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from GBGB9517918.0A external-priority patent/GB9517918D0/en
Priority claimed from GBGB9522281.6A external-priority patent/GB9522281D0/en
Priority claimed from GBGB9606836.6A external-priority patent/GB9606836D0/en
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Publication of EP0847675A1 publication Critical patent/EP0847675A1/en
Application granted granted Critical
Publication of EP0847675B1 publication Critical patent/EP0847675B1/en
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
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • 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
    • 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 transducers and more particularly to vibration transducers for loudspeakers comprising panel-form acoustic radiating elements.
  • US-A-4,506,117 of MULTIPHONIE discloses an electroacoustic transducer comprising an inertial mass adapted to be attached rigidly by its base plate to a panel to be vibrated.
  • Embodiments of the present invention use members of nature, structure and configuration achievable generally and/or specifically by implementing teachings of our co-pending PCT publication No. WO97/09842 of even date herewith.
  • Such members thus have capability to sustain and propagate input vibrational energy by bending waves in operative area(s) extending transversely of thickness often but not necessarily to edges of the member(s); are configured with or without anisotropy of bending stiffness to have resonant mode vibration components distributed over said area(s) beneficially for acoustic coupling with ambient air; and have predetermined preferential locations or sites within said area for transducer means, particularly operationally active or moving part(s) thereof effective in relation to acoustic vibrational activity in said area(s) and signals, usually electrical, corresponding to acoustic content of such vibrational activity.
  • This invention is particularly concerned with active acoustic devices in the form of loudspeakers.
  • Members as above are herein called distributed mode acoustic radiators and are intended to be characterised as in the above PCT application and/or otherwise as specifically provided herein.
  • the invention is a vibration transducer for exciting a member having a face and having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness to have resonant mode vibration components distributed over said at least one area and have predetermined preferential locations or sites within said area for transducer means and having a transducer mounted on said member at one of said locations or sites to vibrate the member to cause it to resonate forming an acoustic radiator which provides an acoustic output when resonating, comprising a motor coil assembly having a coil rigidly fixed to a tubular member, the motor coil assembly being adapted to be fixed to the said face of the member, and a magnet assembly having opposed disc-like pole pieces, the periphery of one of which pole pieces is arranged to be disposed within and adjacent to the motor coil assembly, and the periphery of the other of which pole pieces is formed with a surrounding flange adapted to surround and to be disposed adjacent to the motor coil assembly, and wherein the
  • Fixing means may be provided to secure the magnet assembly to the member.
  • the fixing means may comprise a fastener adapted to engage in a cavity in the member.
  • the fastener may comprise a spacer for spacing the peripheries of the pole pieces from the said member.
  • the vibration transducer may comprise complementary motor coil assemblies and magnet assemblies adapted for mounting on opposed faces of the said member, and means tying the centres of the magnet assemblies together for push/pull operation.
  • the fastener may have heads at opposite ends and adapted to engage the respective magnet assemblies, the fastener comprising a pair of interengaging screw-threaded portions, and spacer means adapted for disposition adjacent to the fastener and adapted for sandwiching between the respective magnet assemblies and the opposed faces of the said member.
  • the invention is a loudspeaker characterised by a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness to have resonant mode vibration components distributed over said at least one area and have predetermined preferential locations or sites within said area for transducer means and having a vibration transducer as described above mounted on said member at one of said locations or sites to vibrate the member to cause it to resonate forming an acoustic radiator which provides an acoustic output when resonating.
  • a panel-form loudspeaker (81) of the kind described and claimed in our co-pending International publication No. WO97/09842 of even date herewith comprising a rectangular frame (1) carrying a resilient suspension (3) round its inner periphery which supports a distributed mode sound radiating panel (2).
  • a transducer (9) e.g as described in detail with reference to our co-pending International publication Nos. WO97/09859, WO97/09861, WO97/09858 of even date herewith, is mounted wholly and exclusively on or in the panel (2) at a predetermined location defined by dimensions x and y , the position of which location is calculated as described in our co-pending International publication No. W097/09842 of even date herewith, to launch bending waves into the panel to cause the panel to resonate to radiate an acoustic output.
  • the transducer (9) is driven by a signal amplifier (10), e.g. an audio amplifier, connected to the transducer by conductors (28).
  • a signal amplifier (10) e.g. an audio amplifier
  • Amplifier loading and power requirements can be entirely normal, similar to conventional cone type speakers, sensitivity being of the order of 86 - 88dB/watt under room loaded conditions.
  • Amplifier load impedance is largely resistive at 6 ohms, power handling 20-80 watts. Where the panel core and/or skins are of metal, they may be made to act as a heat sink for the transducer to remove heat from the motor coil of the transducer and thus improve power handling.
  • Figures 2 a and 2 b are partial typical cross-sections through the loudspeaker (81) of Figure 1.
  • Figure 2 a shows that the frame (1), surround (3) and panel (2) are connected together by respective adhesive-bonded joints (20).
  • Suitable materials for the frame include lightweight framing, e.g. picture framing of extruded metal e.g. aluminium alloy or plastics.
  • Suitable surround materials include resilient materials such as foam rubber and foam plastics.
  • Suitable adhesives for the joints (20) include epoxy, acrylic and cyano-acrylate etc. adhesives.
  • Figure 2 b illustrates, to an enlarged scale, that the panel (2) is a rigid lightweight panel having a core (22) e.g. of a rigid plastics foam (97) e.g. cross linked polyvinylchloride or a cellular matrix (98) i.e. a honeycomb matrix of metal foil, plastics or the like, with the cells extending transversely to the plane of the panel, and enclosed by opposed skins (21) e.g. of paper, card, plastics or metal foil or sheet.
  • the skins are of plastics, they may be reinforced with fibres e.g. of carbon, glass, Kevlar (RTM) or the like in a manner known per se to increase their modulus.
  • RTM Kevlar
  • Envisaged skin layer materials and reinforcements thus include carbon, glass, Kevlar (RTM), Nomex (RTM) i.e. aramid etc. fibres in various lays and weaves, as well as paper, bonded paper laminates, melamine, and various synthetic plastics films of high modulus, such as Mylar (RTM), Kaptan (RTM), polycarbonate, phenolic, polyester or related plastics, and fibre reinforced plastics, etc. and metal sheet or foil.
  • Investigation of the Vectra grade of liquid crystal polymer thermoplastics shows that they may be useful for the injection moulding of ultra thin skins or shells of smaller size, say up to around 30cm diameter. This material self forms an orientated crystal structure in the direction of injection, a preferred orientation for the good propagation of treble energy from the driving point to the panel perimeter.
  • thermoplastics allow for the mould tooling to carry location and registration features such as grooves or rings for the accurate location of transducer parts e.g. the motor coil, and the magnet suspension. Additional with some weaker core materials it is calculated that it would be advantageous to increase the skin thickness locally e.g. in an area or annulus up to 150% of the transducer diameter, to reinforce that area and beneficially couple vibration energy into the panel. High frequency response will be improved with the softer foam materials by this means.
  • Envisaged core layer materials include fabricated honeycombs or corrugations of aluminium alloy sheet or foil, or Kevlar (RTM), Nomex (RTM), plain or bonded papers, and various synthetic plastics films, as well as expanded or foamed plastics or pulp materials, even aerogel metals if of suitably low density.
  • Some suitable core layer materials effectively exhibit usable self-skinning in their manufacture and/or otherwise have enough inherent stiffness for use without lamination between skin layers.
  • a high performance cellular core material is known under the trade name 'Rohacell' which may be suitable as a radiator panel and which is without skins. In practical terms, the aim is for an overall lightness and stiffness suited to a particular purpose, specifically including optimising contributions from core and skin layers and transitions between them.
  • piezo and electro dynamic transducers have negligible electromagnetic radiation or stray magnet fields.
  • Conventional speakers have a large magnetic field, up to 1 metre distant unless specific compensation counter measures are taken.
  • electrical connection can be made to the conductive parts of an appropriate DML panel or an electrically conductive foam or similar interface may be used for the edge mounting.
  • the suspension (3) may damp the edges of the panel (2) to prevent excessive edge movement of the panel. Additionally or alternatively, further damping may be applied, e.g. as patches, bonded to the panel in selected positions to damp excessive movement to distribute resonance equally over the panel.
  • the patches may be of bitumen-based material, as commonly used in conventional loudspeaker enclosures or may be of a resilient or rigid polymeric sheet material. Some materials, notably paper and card, and some cores may be self-damping. Where desired, the damping may be increased in the construction of the panels by employing resiliently setting, rather than rigid setting adhesives.
  • Effective said selective damping includes specific application to the panel including its sheet material of means permanently associated therewith. Edges and corners can be particularly significant for dominant and less dispersed low frequency vibration modes of panels hereof. Edge-wise fixing of damping means can usefully lead to a panel with its said sheet material fully framed, though their corners can often be relatively free, say for desired extension to lower frequency operation. Attachment can be by adhesive or self-adhesive materials. Other forms of useful damping, particularly in terms of more subtle effects and/or mid- and higher frequencies can be by way of suitable mass or masses affixed to the sheet material at predetermined effective medial localised positions of said area.
  • An acoustic panel as described above is bidirectional.
  • the sound energy from the back is not strongly phase related to that from the front. Consequently there is the benefit of overall summation of acoustic power in the room, sound energy of uniform frequency distribution, reduced reflective and standing wave effects and with the advantage of superior reproduction of the natural space and ambience in the reproduced sound recordings.
  • Figure 3 illustrates an embodiment of transducer (9) for launching bending waves into a rigid lightweight distributed mode radiator panel (2), e.g. of the kind shown in Figures 1 and 2 comprising a core (22) enclosed by opposed skins (21), to cause the panel to resonate.
  • a rigid lightweight distributed mode radiator panel (2) e.g. of the kind shown in Figures 1 and 2 comprising a core (22) enclosed by opposed skins (21), to cause the panel to resonate.
  • the transducer comprises a coil (13) rigidly fixed, e.g. by means of an adhesive, on the outside of a coil former (18) which is rigidly bonded to a surface skin (21) of the radiator panel (2), e.g. by means of an epoxy adhesive bond (16).
  • a magnet (15) is enclosed by a pair of poles (14), one of which is disc-like and is disposed with its periphery close to the interior of the coil former (18), and the other of which has a peripheral flange (90) arranged to surround the coil (13).
  • the magnet assembly including the magnet (15) and poles (14) is mounted on the panel (2) by means of a fixing (93), e.g. of metal or hard plastics, which passes through a cavity (29) extending through the panel (2).
  • the fixing (93) comprises a complementary pair of threaded members (91,92) each having heads (95), one of which heads bears against an outer face of the transducer (9) and the other of which heads bear against a face of the panel (2) on the side of the panel opposite to that on which the transducer is mounted.
  • a spacer (127) is trapped between the transducer (9) and the panel (2) to space the transducer from the panel.
  • the transducer (9) of Figure 3 operates by locally resiliently bending the panel between the fixing (93) and the former (18) when an acoustic signal is applied to the transducer to launch bending waves into the panel to cause it to resonate.
  • the transducer arrangement (9) of Figure 4 is similar to that described in Figure 3, except that in this embodiment the transducer comprises complementary push/pull drivers of the kind shown in Figure 3 disposed on opposite sides of the panel.
  • a fixing member (93) is arranged to pass through an aperture (29) in the panel (2) to tie the two transducers together and to the panel.
  • the fixing member (93) comprises opposed generally complementary parts each formed with a head (95) which are clamped against the axial extremities of the respective pair of transducers (9) to couple the drivers together.
  • the complementary parts of the fixing member (93) are secured together by complementary screw-threaded portions (94,96).
  • the fixing member may be of any suitable material e.g. plastics or metal.
  • the transducer device (9) is rigidly clamped to the panel (2) by means of rigid pads (19), e.g. of hard plastics, positioned between the panel and the poles (14) adjacent to the aperture (29), whereby the transducer works to launch bending waves into the panel by local resilient bending of the panel between the pads and the coil former (18).
  • rigid pads (19) e.g. of hard plastics

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Surgical Instruments (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
EP96929393A 1995-09-02 1996-09-02 Vibration transducers Expired - Lifetime EP0847675B1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
GBGB9517918.0A GB9517918D0 (en) 1995-09-02 1995-09-02 Acoustic device
GB9517918 1995-09-02
GBGB9522281.6A GB9522281D0 (en) 1995-10-31 1995-10-31 Acoustic device
GB9522281 1995-10-31
GB9606836 1996-03-30
GBGB9606836.6A GB9606836D0 (en) 1996-03-30 1996-03-30 Acoustic device
PCT/GB1996/002148 WO1997009858A1 (en) 1995-09-02 1996-09-02 Vibration transducers

Publications (2)

Publication Number Publication Date
EP0847675A1 EP0847675A1 (en) 1998-06-17
EP0847675B1 true EP0847675B1 (en) 1999-03-10

Family

ID=34865240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96929393A Expired - Lifetime EP0847675B1 (en) 1995-09-02 1996-09-02 Vibration transducers

Country Status (20)

Country Link
EP (1) EP0847675B1 (ru)
JP (1) JPH11512252A (ru)
AT (1) ATE177583T1 (ru)
AU (1) AU703061B2 (ru)
BR (1) BR9610440A (ru)
CA (1) CA2229856A1 (ru)
CZ (2) CZ57598A3 (ru)
DE (1) DE69601734T2 (ru)
DK (1) DK0847675T3 (ru)
EA (1) EA000376B1 (ru)
ES (1) ES2131956T3 (ru)
HK (1) HK1008639A1 (ru)
HU (1) HUP9802389A2 (ru)
IL (1) IL123371A (ru)
NZ (1) NZ316550A (ru)
PL (1) PL325284A1 (ru)
RO (1) RO119055B1 (ru)
SK (1) SK25698A3 (ru)
TR (1) TR199800369T1 (ru)
WO (1) WO1997009858A1 (ru)

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GB9709438D0 (en) * 1997-05-10 1997-07-02 New Transducers Ltd Loudspeaker transducer
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DE19821861A1 (de) * 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Vorrichtung zur dynamischen Anregung von Plattenlautsprechern
TR200003739T2 (tr) 1998-06-22 2001-06-21 Slab Technology Limited Hoparlörler
US6304435B1 (en) 1998-11-12 2001-10-16 Acer Incorporated Laptop computer with flat panel speakers
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SE516270C2 (sv) * 2000-03-09 2001-12-10 Osseofon Ab Elektromagnetisk vibrator
SE0002073L (sv) 2000-06-02 2001-05-21 P & B Res Ab Vibrator för benförankrade samt benledningshörapparater
SE0002072L (sv) * 2000-06-02 2001-05-21 P & B Res Ab Vibrator för benförankrade samt benledningshörapparater
US7548854B2 (en) 2002-01-31 2009-06-16 Awi Licensing Company Architectural sound enhancement with pre-filtered masking sound
SE522164C2 (sv) * 2002-05-10 2004-01-20 Osseofon Ab Anordning vid elektromagnetisk vibrator
US7471801B2 (en) 2002-05-10 2008-12-30 Osseofon Ab Device for the generation of or monitoring of vibrations
US7447322B2 (en) 2004-01-13 2008-11-04 Brookstone Purchasing, Inc. Speaker having a transparent panel
US8284955B2 (en) 2006-02-07 2012-10-09 Bongiovi Acoustics Llc System and method for digital signal processing
US11431312B2 (en) 2004-08-10 2022-08-30 Bongiovi Acoustics Llc System and method for digital signal processing
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
US10848118B2 (en) 2004-08-10 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
TW200629959A (en) * 2004-09-22 2006-08-16 Citizen Electronics Electro-dynamic exciter
US10069471B2 (en) 2006-02-07 2018-09-04 Bongiovi Acoustics Llc System and method for digital signal processing
US11202161B2 (en) 2006-02-07 2021-12-14 Bongiovi Acoustics Llc System, method, and apparatus for generating and digitally processing a head related audio transfer function
US9615189B2 (en) 2014-08-08 2017-04-04 Bongiovi Acoustics Llc Artificial ear apparatus and associated methods for generating a head related audio transfer function
US10701505B2 (en) 2006-02-07 2020-06-30 Bongiovi Acoustics Llc. System, method, and apparatus for generating and digitally processing a head related audio transfer function
US10848867B2 (en) 2006-02-07 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
CN101454277B (zh) 2006-05-17 2014-02-19 美洲染料资源公司 用于平版印刷版涂料的材料、含这些材料的平版印刷版和涂料以及制备方法和用途
ES2413195B1 (es) * 2010-02-10 2014-05-21 Fco. Javier Porras Vila Altavoz-generador electrico
US9883318B2 (en) 2013-06-12 2018-01-30 Bongiovi Acoustics Llc System and method for stereo field enhancement in two-channel audio systems
US9264004B2 (en) 2013-06-12 2016-02-16 Bongiovi Acoustics Llc System and method for narrow bandwidth digital signal processing
US9154862B2 (en) * 2013-06-27 2015-10-06 The Boeing Company Flat panel loudspeaker system
US9014413B2 (en) 2013-08-21 2015-04-21 The Boeing Company Dual coil loudspeaker system
US9906858B2 (en) 2013-10-22 2018-02-27 Bongiovi Acoustics Llc System and method for digital signal processing
US9615813B2 (en) 2014-04-16 2017-04-11 Bongiovi Acoustics Llc. Device for wide-band auscultation
US10639000B2 (en) 2014-04-16 2020-05-05 Bongiovi Acoustics Llc Device for wide-band auscultation
US10820883B2 (en) 2014-04-16 2020-11-03 Bongiovi Acoustics Llc Noise reduction assembly for auscultation of a body
US9564146B2 (en) 2014-08-01 2017-02-07 Bongiovi Acoustics Llc System and method for digital signal processing in deep diving environment
US9638672B2 (en) 2015-03-06 2017-05-02 Bongiovi Acoustics Llc System and method for acquiring acoustic information from a resonating body
WO2017087495A1 (en) 2015-11-16 2017-05-26 Bongiovi Acoustics Llc Surface acoustic transducer
US9621994B1 (en) 2015-11-16 2017-04-11 Bongiovi Acoustics Llc Surface acoustic transducer
WO2019200119A1 (en) 2018-04-11 2019-10-17 Bongiovi Acoustics Llc Audio enhanced hearing protection system
WO2020028833A1 (en) 2018-08-02 2020-02-06 Bongiovi Acoustics Llc System, method, and apparatus for generating and digitally processing a head related audio transfer function

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Also Published As

Publication number Publication date
CA2229856A1 (en) 1997-03-13
DE69601734T2 (de) 1999-09-16
BR9610440A (pt) 1999-02-17
DK0847675T3 (da) 1999-09-27
TR199800369T1 (xx) 1998-05-21
EA000376B1 (ru) 1999-06-24
RO119055B1 (ro) 2004-02-27
CZ57698A3 (cs) 1998-11-11
EA199800248A1 (ru) 1998-10-29
IL123371A0 (en) 1998-09-24
ES2131956T3 (es) 1999-08-01
HUP9802389A2 (hu) 1999-02-01
DE69601734D1 (de) 1999-04-15
IL123371A (en) 2001-07-24
CZ57598A3 (cs) 1998-07-15
WO1997009858A1 (en) 1997-03-13
EP0847675A1 (en) 1998-06-17
JPH11512252A (ja) 1999-10-19
NZ316550A (en) 1998-10-28
PL325284A1 (en) 1998-07-20
HK1008639A1 (en) 1999-05-14
SK25698A3 (en) 1998-09-09
ATE177583T1 (de) 1999-03-15
AU6880896A (en) 1997-03-27
AU703061B2 (en) 1999-03-11

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