WO2000070908A2 - Bending wave loudspeakers - Google Patents
Bending wave loudspeakers Download PDFInfo
- Publication number
- WO2000070908A2 WO2000070908A2 PCT/GB2000/001666 GB0001666W WO0070908A2 WO 2000070908 A2 WO2000070908 A2 WO 2000070908A2 GB 0001666 W GB0001666 W GB 0001666W WO 0070908 A2 WO0070908 A2 WO 0070908A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- panel
- enclosure
- bending
- wave
- acoustic absorber
- Prior art date
Links
- 238000005452 bending Methods 0.000 title description 2
- 239000006098 acoustic absorber Substances 0.000 claims abstract description 15
- 239000000725 suspension Substances 0.000 claims abstract description 13
- 239000006261 foam material Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 description 11
- 230000005855 radiation Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920001651 Cyanoacrylate Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- MWCLLHOVUTZFKS-UHFFFAOYSA-N Methyl cyanoacrylate Chemical compound COC(=O)C(=C)C#N MWCLLHOVUTZFKS-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229920001821 foam rubber Polymers 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
Classifications
-
- 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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
-
- 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
-
- 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
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
- H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
Definitions
- the invention relates to loudspeakers and more particularly to bending-wave panel -form loudspeakers, e.g. of the kind described m International patent application WO97/09842.
- Such loudspeakers are known as 'distributed mode' or "DM" loudspeakers or simply as DML.
- Bending-wave panels emit acoustic radiation from both sides i.e. are bi-polar and to allow easier positioning of the loudspeaker in a room, e.g. against a wall, the rear radiation from the panel can be blocked by mounting the panel in a sealed box or enclosure with flexible suspension or surround material around the panel perimeter. This prevents any destructive interference from reflecting surfaces to the rear of the panel .
- the panel suspension or surround material may be a strip of flexible foam rubber or plastics with adhesive tape on both sides so that it can be fixed to both the panel and the box.
- standing waves may be set up m the box or enclosure which can adversely affect the frequency response of the panel .
- These standing waves can be damped by filling the box or enclosure with an acoustic absorber, e.g. of soft foam which can contact either the bending-wave panel or the back of the box or enclosure.
- acoustic absorber e.g. of soft foam which can contact either the bending-wave panel or the back of the box or enclosure.
- Flexible polyester or polyether foams are suitable for this application.
- a known set-up for a bending-wave panel of the DML kind in an enclosure uses a strip of flexible foam as a suspension or surround and uses a separate acoustic absorber in the enclosure.
- a loudspeaker comprising a bending-wave panel m an enclosure, wherein the panel surround suspension system and the acoustic absorber are integrated.
- a soft foam used as the acoustic absorber may thus be compressed to the required thickness around the perimeter of the panel to form the flexible surround whereas the central region of the foam remains uncompressed allowing it to form an effective acoustic absorber.
- Figure 2 is a cross sectional side view of a bending- wave loudspeaker according to the invention.
- FIG 1 there is shown a prior-art bending-wave panel loudspeaker 1, comprising a bending-wave loudspeaker 1, comprising a bending-wave panel 2 mounted in an enclosure or box 3 by means of a surround or suspension 4 e.g. of a resilient foamed rubber or plastics.
- a surround or suspension 4 e.g. of a resilient foamed rubber or plastics.
- a vibration exciter 8 is fixed to the panel 2 to launch bending wave energy into the panel to cause it to resonate to produce an acoustic output, e.g. as taught m WO97/09842.
- FIG. 2 there is shown a loudspeaker generally similar to that of Figure 1, but modified according to the principles of the present invention.
- the surround/suspension 4 is integral with the acoustic absorber 7.
- a manufacturing process for the unitary absorber/suspension 4,7 may be as follows:
- the panel surround (including the panel and acoustic absorber) can then, for example, be adhesively bonded or mechanically clamped to the back box to form a complete unit.
- Compressing the foam around the perimeter changes it from an open-cell foam suitable as an absorber into a compressed version where the cells are squashed to an extent that the perimeter has very little acoustic power transmitted through it. This ensures isolation of the rear radiation from the front.
- the present invention thus provides a new design whereby the foam surround and acoustic absorber are incorporated into a single item which can be easily formed and bonded to the panel m a simple press tool.
- This new design simplifies the manufacturing process for a DML or the like used m a closed back design.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU45878/00A AU4587800A (en) | 1999-05-14 | 2000-05-11 | Loudspeakers |
EP00927475A EP1179283A2 (en) | 1999-05-14 | 2000-05-11 | Bending wave loudspeakers |
JP2000619234A JP2003500914A (en) | 1999-05-14 | 2000-05-11 | Bending wave loudspeaker |
US09/985,781 US6397972B1 (en) | 1999-05-14 | 2001-11-06 | Loudspeakers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9911156.9 | 1999-05-14 | ||
GBGB9911156.9A GB9911156D0 (en) | 1999-05-14 | 1999-05-14 | Loudspeakers |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/985,781 Continuation US6397972B1 (en) | 1999-05-14 | 2001-11-06 | Loudspeakers |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000070908A2 true WO2000070908A2 (en) | 2000-11-23 |
WO2000070908A3 WO2000070908A3 (en) | 2001-02-15 |
Family
ID=10853417
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/001666 WO2000070908A2 (en) | 1999-05-14 | 2000-05-11 | Bending wave loudspeakers |
Country Status (7)
Country | Link |
---|---|
US (1) | US6397972B1 (en) |
EP (1) | EP1179283A2 (en) |
JP (1) | JP2003500914A (en) |
CN (1) | CN1345525A (en) |
AU (1) | AU4587800A (en) |
GB (1) | GB9911156D0 (en) |
WO (1) | WO2000070908A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2367706A (en) * | 2000-06-02 | 2002-04-10 | New Transducers Ltd | Bending wave loudspeaker with wall mounting arrangement |
EP3474568A1 (en) * | 2017-10-18 | 2019-04-24 | ALSTOM Transport Technologies | Vehicle wall and associated transport vehicle |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19944802C2 (en) * | 1999-09-20 | 2003-08-28 | Harman Audio Electronic Sys | door |
US8103024B2 (en) * | 2000-09-20 | 2012-01-24 | Harman Becker Automotive Systems Gmbh | Door with structural components configured to radiate acoustic energy |
US7109959B2 (en) | 2002-02-06 | 2006-09-19 | Andersen Corporation | Multi-task window |
US7180489B2 (en) * | 2002-02-06 | 2007-02-20 | Andersen Corporation | Automated multi-task window assembly |
US6988339B2 (en) * | 2002-02-06 | 2006-01-24 | Andersen Corporation | Specialty media window |
US7426804B2 (en) * | 2002-02-06 | 2008-09-23 | Andersen Corporation | Specialty display window |
US6833536B2 (en) * | 2002-05-22 | 2004-12-21 | Applera Corporation | Non-contact radiant heating and temperature sensing device for a chemical reaction chamber |
US7636447B2 (en) * | 2004-03-12 | 2009-12-22 | Multi Service Corporation | Acoustic bracket system |
US20060013417A1 (en) * | 2004-07-16 | 2006-01-19 | Intier Automotive Inc. | Acoustical panel assembly |
US8139795B2 (en) * | 2006-10-13 | 2012-03-20 | Airbus Deutschland Gmbh | Loudspeaker system for aircraft cabin |
EP3788800A1 (en) * | 2018-06-11 | 2021-03-10 | Symphonova, Ltd. | Resonating loudspeakers and related systems and methods |
JP7269135B2 (en) * | 2019-08-29 | 2023-05-08 | フォルシアクラリオン・エレクトロニクス株式会社 | vibration output device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3720285A (en) * | 1970-06-30 | 1973-03-13 | Rand Org Ltd | Loudspeakers |
FR2549333A1 (en) * | 1983-07-13 | 1985-01-18 | Link Gerard | Passive simulator of infinite load. |
WO1997009842A2 (en) * | 1995-09-02 | 1997-03-13 | New Transducers Limited | Acoustic device |
WO2000007409A1 (en) * | 1998-07-29 | 2000-02-10 | New Transducers Limited | Loudspeaker drive unit having a resonant panel-form member |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6247551B1 (en) * | 1990-08-04 | 2001-06-19 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Panel-form loudspeaker |
US5241512A (en) * | 1991-04-25 | 1993-08-31 | Hutchinson 2 | Acoustic protection material and apparatus including such material |
US6324052B1 (en) * | 1996-09-03 | 2001-11-27 | New Transducers Limited | Personal computing devices comprising a resonant panel loudspeaker |
US6324294B1 (en) * | 1996-09-03 | 2001-11-27 | New Transducers Limited | Passenger vehicles incorporating loudspeakers comprising panel-form acoustic radiating elements |
-
1999
- 1999-05-14 GB GBGB9911156.9A patent/GB9911156D0/en not_active Ceased
-
2000
- 2000-05-11 WO PCT/GB2000/001666 patent/WO2000070908A2/en not_active Application Discontinuation
- 2000-05-11 EP EP00927475A patent/EP1179283A2/en not_active Withdrawn
- 2000-05-11 JP JP2000619234A patent/JP2003500914A/en active Pending
- 2000-05-11 CN CN00805811A patent/CN1345525A/en active Pending
- 2000-05-11 AU AU45878/00A patent/AU4587800A/en not_active Abandoned
-
2001
- 2001-11-06 US US09/985,781 patent/US6397972B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3720285A (en) * | 1970-06-30 | 1973-03-13 | Rand Org Ltd | Loudspeakers |
FR2549333A1 (en) * | 1983-07-13 | 1985-01-18 | Link Gerard | Passive simulator of infinite load. |
WO1997009842A2 (en) * | 1995-09-02 | 1997-03-13 | New Transducers Limited | Acoustic device |
WO2000007409A1 (en) * | 1998-07-29 | 2000-02-10 | New Transducers Limited | Loudspeaker drive unit having a resonant panel-form member |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2367706A (en) * | 2000-06-02 | 2002-04-10 | New Transducers Ltd | Bending wave loudspeaker with wall mounting arrangement |
EP3474568A1 (en) * | 2017-10-18 | 2019-04-24 | ALSTOM Transport Technologies | Vehicle wall and associated transport vehicle |
Also Published As
Publication number | Publication date |
---|---|
AU4587800A (en) | 2000-12-05 |
WO2000070908A3 (en) | 2001-02-15 |
EP1179283A2 (en) | 2002-02-13 |
GB9911156D0 (en) | 1999-07-14 |
US20020029925A1 (en) | 2002-03-14 |
JP2003500914A (en) | 2003-01-07 |
US6397972B1 (en) | 2002-06-04 |
CN1345525A (en) | 2002-04-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1101388B1 (en) | Louspeaker drive unit having a resonant panel-form member | |
CN109803215B (en) | Acoustic device and electronic apparatus | |
JP3542136B2 (en) | Inertial vibration transducer | |
KR100443204B1 (en) | Inertial vibration transducer | |
US6278790B1 (en) | Electroacoustic transducers comprising vibrating panels | |
EP1179283A2 (en) | Bending wave loudspeakers | |
CN209462592U (en) | Acoustic apparatus and electronic equipment | |
CA2273025A1 (en) | Electroacoustic transducers comprising vibrating panels | |
EA002108B1 (en) | Loudspeaker comprising panel-form acoustic radiating elements | |
EA000858B1 (en) | Inertial vibration transducers | |
SK25898A3 (en) | Visual display means incorporating loudspeakers | |
RO119048B1 (en) | Loudspeaker | |
CN110839194B (en) | Acoustic device and electronic apparatus | |
JPH11512254A (en) | Panel microphone | |
RO119044B1 (en) | Panel-shaped speaker | |
WO2000022877A8 (en) | Resonant panel loudspeakers | |
EA000859B1 (en) | Greetings or the like card | |
EA000929B1 (en) | Pannel-form loudspeakers | |
CN209949409U (en) | Acoustic device and electronic apparatus | |
CN116783434A (en) | Refrigerator with a refrigerator body | |
CN115474140A (en) | Refrigerator with a door | |
JPH02301400A (en) | Ultrasonic ceramic microphone | |
MXPA98001592A (en) | Loudspeakers that comprise elements of acoustic radiation in the form of pa |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 00805811.3 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
AK | Designated states |
Kind code of ref document: A3 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A3 Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2000927475 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 09985781 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2000 619234 Country of ref document: JP Kind code of ref document: A |
|
WWP | Wipo information: published in national office |
Ref document number: 2000927475 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2000927475 Country of ref document: EP |