EP0988775A1 - Schwingungswandler für resonanten plattenförmigen lautsprecher und damit versehener lautsprecher - Google Patents
Schwingungswandler für resonanten plattenförmigen lautsprecher und damit versehener lautsprecherInfo
- Publication number
- EP0988775A1 EP0988775A1 EP98920643A EP98920643A EP0988775A1 EP 0988775 A1 EP0988775 A1 EP 0988775A1 EP 98920643 A EP98920643 A EP 98920643A EP 98920643 A EP98920643 A EP 98920643A EP 0988775 A1 EP0988775 A1 EP 0988775A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- panel
- vibration exciter
- loudspeaker
- exciter
- voice coil
- 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
Links
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.
- a vibration exciter for imparting bending wave energy to a resonant panel to provide an acoustic output, wherein the exciter is adapted to be coupled to the panel at a plurality of discrete positions forming a triangular array of contact patches.
- 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.
- Figure 1 is a partial view of a prior art resonant panel loudspeaker and showing the area of the mounting or connection between a vibration exciter and the resonant panel
- Figure 2 is a partial view generally similar to that of Figures 1 and illustrating a first embodiment according to the invention
- Figure 3 is a cross-sectional side elevation of a vibration exciter attached to a resonant panel and corresponding to Figure 2;
- Figure 4 is a view generally similar to that of Figure 1 and illustrating a second embodiment according to the invention
- Figure 5 is a view generally similar to that of Figure 1 illustrating a third embodiment according to the invention
- Figure 6 is a cross-sectional side elevation of a vibration exciter attached to a resonant panel and corresponding to Figure 5.
- 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.
- BEST MODES FOR CARRYING OUT THE INVENTION Referring now to Figures 2 to 6 of the drawings, and more particularly to Figures 2 and 3 of the drawings, 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 lib 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
- 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 (5b) 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.
- INDUSTRIAL APPLICABILITY 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)
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 (en) | 1997-05-10 | 1998-05-06 | Vibration transducers for resonant panel-form loudspeaker and loudspeaker with the same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0988775A1 true EP0988775A1 (de) | 2000-03-29 |
EP0988775B1 EP0988775B1 (de) | 2001-09-19 |
Family
ID=10812062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98920643A Expired - Lifetime EP0988775B1 (de) | 1997-05-10 | 1998-05-06 | Schwingungswandler für resonanten plattenförmigen lautsprecher und damit versehener lautsprecher |
Country Status (21)
Country | Link |
---|---|
EP (1) | EP0988775B1 (de) |
JP (1) | JP2002505813A (de) |
KR (1) | KR20010012364A (de) |
CN (1) | CN1255278A (de) |
AR (1) | AR012678A1 (de) |
AT (1) | ATE205993T1 (de) |
AU (1) | AU734941B2 (de) |
BR (1) | BR9809609A (de) |
CA (1) | CA2290103A1 (de) |
CO (1) | CO4780082A1 (de) |
DE (1) | DE69801755T2 (de) |
DK (1) | DK0988775T3 (de) |
ES (1) | ES2164423T3 (de) |
GB (1) | GB9709438D0 (de) |
HK (1) | HK1024134A1 (de) |
ID (1) | ID20950A (de) |
IL (1) | IL132587A0 (de) |
PT (1) | PT988775E (de) |
TW (1) | TW381404B (de) |
WO (1) | WO1998052383A1 (de) |
ZA (1) | ZA983836B (de) |
Families Citing this family (45)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19821861A1 (de) * | 1998-05-15 | 1999-11-18 | Nokia Deutschland Gmbh | Vorrichtung zur dynamischen Anregung von Plattenlautsprechern |
GB2360665B (en) * | 1998-06-22 | 2003-01-15 | Slab Technology Ltd | Loudspeakers |
ATE303051T1 (de) * | 1998-06-22 | 2005-09-15 | Slab Technology Ltd | Lautsprecher |
GB9902585D0 (en) * | 1999-02-06 | 1999-03-24 | New Transducers Ltd | Vibration exciter |
TW511391B (en) | 2000-01-24 | 2002-11-21 | New Transducers Ltd | Transducer |
US6865277B2 (en) | 2000-01-27 | 2005-03-08 | New Transducers Limited | Passenger vehicle |
US7151837B2 (en) | 2000-01-27 | 2006-12-19 | New Transducers Limited | Loudspeaker |
US6885753B2 (en) | 2000-01-27 | 2005-04-26 | New Transducers Limited | Communication device using bone conduction |
US6965678B2 (en) | 2000-01-27 | 2005-11-15 | New Transducers Limited | Electronic article comprising loudspeaker and touch pad |
JP2005505982A (ja) * | 2001-10-04 | 2005-02-24 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 可動コイルを有すると共に該可動コイルの接続リード用の可動保持エレメントを有する電気音響トランスジューサ |
US7548854B2 (en) | 2002-01-31 | 2009-06-16 | Awi Licensing Company | Architectural sound enhancement with pre-filtered masking sound |
US6983819B2 (en) | 2002-04-02 | 2006-01-10 | Awi Licensing Company | Entertainment sound panels |
WO2005002926A1 (de) * | 2003-07-01 | 2005-01-13 | Johnson Controls Gmbh | Ausstattungsteil für ein fahrzeug, insbesondere ein kraftfahrzeug und verwendung eines ausstattungsteils als lautsprecher |
US7447322B2 (en) | 2004-01-13 | 2008-11-04 | Brookstone Purchasing, Inc. | Speaker having a transparent panel |
JP2006020135A (ja) * | 2004-07-02 | 2006-01-19 | Fujitsu Ten Ltd | 振動板駆動ユニット及びこのユニットを用いた薄型スピーカ |
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 |
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 |
TW200629959A (en) * | 2004-09-22 | 2006-08-16 | Citizen Electronics | Electro-dynamic exciter |
SE528279C2 (sv) * | 2005-02-21 | 2006-10-10 | Entific Medical Systems Ab | Vibrator för benledande hörapparat |
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 |
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 |
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 |
US10069471B2 (en) | 2006-02-07 | 2018-09-04 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10848867B2 (en) | 2006-02-07 | 2020-11-24 | Bongiovi Acoustics Llc | System and method for digital signal processing |
EP2071868B1 (de) * | 2006-09-27 | 2013-06-26 | ZHANG, Bailiang | Vibrationssystem für einen elektrodynamischen lautsprecher in tafelform |
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 |
US9906858B2 (en) | 2013-10-22 | 2018-02-27 | Bongiovi Acoustics Llc | System and method for digital signal processing |
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 |
US9615813B2 (en) | 2014-04-16 | 2017-04-11 | Bongiovi Acoustics Llc. | Device for wide-band auscultation |
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 |
US9621994B1 (en) | 2015-11-16 | 2017-04-11 | Bongiovi Acoustics Llc | Surface acoustic transducer |
WO2017087495A1 (en) | 2015-11-16 | 2017-05-26 | Bongiovi Acoustics Llc | Surface acoustic transducer |
AU2019252524A1 (en) | 2018-04-11 | 2020-11-05 | 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 |
CN209767821U (zh) * | 2019-06-20 | 2019-12-10 | 苏州上声电子股份有限公司 | 一种多路输入驱动的扬声器 |
CN210053564U (zh) * | 2019-07-02 | 2020-02-11 | 苏州茹声电子有限公司 | 多路输入驱动的扬声器 |
CN110225440A (zh) * | 2019-07-15 | 2019-09-10 | 苏州茹声电子有限公司 | 一种多路输入驱动的扬声器 |
RU2746441C1 (ru) * | 2020-06-02 | 2021-04-14 | Сотис АГ | Громковоритель |
CN117716707A (zh) * | 2021-07-30 | 2024-03-15 | Agc株式会社 | 振动板、带激励器的振动板以及车辆用振动板 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2434005A1 (de) * | 1974-07-15 | 1976-02-05 | Siemens Ag | Piezokeramischer wandler |
EP0054945B1 (de) * | 1980-12-19 | 1985-10-30 | Nissan Motor Co., Ltd. | Lautsprecher für Automobil-Audiosystem |
JPH11512135A (ja) * | 1995-09-01 | 1999-10-19 | ソムメ レヴェトマント ルクセンブルグ ソシエ テ アノニム | 粉末状イオノマーの製造方法並びにその床および壁の外装材の保護層としての使用 |
JP3542136B2 (ja) * | 1995-09-02 | 2004-07-14 | ニュー トランスデューサーズ リミテッド | 慣性振動トランスジューサ |
DE69601734T2 (de) * | 1995-09-02 | 1999-09-16 | New Transducers Ltd | Schwingungswandler |
CZ57498A3 (cs) * | 1995-09-02 | 1998-07-15 | New Transducers Limited | Setrvačný vibrační měnič |
-
1997
- 1997-05-10 GB GBGB9709438.7A patent/GB9709438D0/en active Pending
-
1998
- 1998-05-06 DE DE69801755T patent/DE69801755T2/de not_active Expired - Fee Related
- 1998-05-06 AU AU73436/98A patent/AU734941B2/en not_active Ceased
- 1998-05-06 CN CN98804811A patent/CN1255278A/zh active Pending
- 1998-05-06 JP JP54889598A patent/JP2002505813A/ja active Pending
- 1998-05-06 KR KR1019997010316A patent/KR20010012364A/ko not_active Application Discontinuation
- 1998-05-06 WO PCT/GB1998/001316 patent/WO1998052383A1/en not_active Application Discontinuation
- 1998-05-06 CA CA002290103A patent/CA2290103A1/en not_active Abandoned
- 1998-05-06 BR BR9809609-5A patent/BR9809609A/pt not_active IP Right Cessation
- 1998-05-06 DK DK98920643T patent/DK0988775T3/da active
- 1998-05-06 IL IL13258798A patent/IL132587A0/xx unknown
- 1998-05-06 AT AT98920643T patent/ATE205993T1/de not_active IP Right Cessation
- 1998-05-06 EP EP98920643A patent/EP0988775B1/de not_active Expired - Lifetime
- 1998-05-06 ES ES98920643T patent/ES2164423T3/es not_active Expired - Lifetime
- 1998-05-06 PT PT98920643T patent/PT988775E/pt unknown
- 1998-05-07 ID IDP980680A patent/ID20950A/id unknown
- 1998-05-07 ZA ZA983836A patent/ZA983836B/xx unknown
- 1998-05-08 CO CO98025672A patent/CO4780082A1/es unknown
- 1998-05-11 AR ARP980102157A patent/AR012678A1/es unknown
- 1998-05-11 TW TW087107236A patent/TW381404B/zh active
-
2000
- 2000-05-30 HK HK00103219A patent/HK1024134A1/xx not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9852383A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR20010012364A (ko) | 2001-02-15 |
IL132587A0 (en) | 2001-03-19 |
DE69801755T2 (de) | 2002-05-29 |
DE69801755D1 (de) | 2001-10-25 |
ZA983836B (en) | 1999-01-25 |
EP0988775B1 (de) | 2001-09-19 |
JP2002505813A (ja) | 2002-02-19 |
AU734941B2 (en) | 2001-06-28 |
ES2164423T3 (es) | 2002-02-16 |
PT988775E (pt) | 2002-03-28 |
GB9709438D0 (en) | 1997-07-02 |
CA2290103A1 (en) | 1998-11-19 |
ID20950A (id) | 1999-04-01 |
ATE205993T1 (de) | 2001-10-15 |
HK1024134A1 (en) | 2000-09-29 |
BR9809609A (pt) | 2000-07-04 |
CN1255278A (zh) | 2000-05-31 |
WO1998052383A1 (en) | 1998-11-19 |
AU7343698A (en) | 1998-12-08 |
TW381404B (en) | 2000-02-01 |
CO4780082A1 (es) | 1999-05-26 |
AR012678A1 (es) | 2000-11-08 |
DK0988775T3 (da) | 2002-01-07 |
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