WO2000067525A2 - Excitateur de vibrations - Google Patents
Excitateur de vibrations Download PDFInfo
- Publication number
- WO2000067525A2 WO2000067525A2 PCT/GB2000/001485 GB0001485W WO0067525A2 WO 2000067525 A2 WO2000067525 A2 WO 2000067525A2 GB 0001485 W GB0001485 W GB 0001485W WO 0067525 A2 WO0067525 A2 WO 0067525A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piezoelectric device
- vibration exciter
- piezoelectric
- attachment portion
- ferroelectric
- Prior art date
Links
- 238000005452 bending Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 2
- 241000357292 Monodactylus Species 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 235000012431 wafers Nutrition 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
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
-
- 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
- H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
Definitions
- the invention relates to piezoelectric vibration exciters e.g. of the kind which may be used to apply bending wave energy to resonant panels to form loudspeakers, and to panel -form loudspeakers employing such exciters.
- Our International patent application WO97/09842 describes such resonant panel loudspeakers and vibration exciters therefor.
- Prior art devices include 'Rainbow' piezoelectric actuators as well as more conventional piezoelectric actuators .
- a vibration exciter comprising a curved piezoelectric device having an attachment portion at which the device is to be attached to a substrate to be vibrated and at least one free portion remote from the attachment portion, and a mass load provided on at least one of the or each free portion.
- the piezoelectric device may be a ferro-electric device and may be pre-stressed. Mass loading such pre- stressed ferroelectric devices may provide a suprismgly large increase m output, of around an order of magnitude, when the devices are used to drive resonant bending wave panel .
- the device may be arcuate m shape or may be a generally circular dished device.
- the invention is a resonant panel - form loudspeaker driven m resonance by a vibration exciter as described above .
- Figure 1 shows a first embodiment of a piezoelectric device according to the invention
- Figure 2 shows a second embodiment
- Figure 3 shows a third embodiment
- Figure 4 shows a fourth embodiment
- a loudspeaker 1 comprises a plate 11 capable of supporting resonant bending wave modes, as set out in O97/09842.
- a curved, composite piezoelectric device 13 such as described in US 5632841 has an attachment portion 12 centrally located on the piezoelectric device.
- the attachment portion 12 is mounted on a preferred, off-centre location on the panel 11.
- the ends 14 of the device are free.
- a mass 15 is provided along the end of the piezoelectric device to mass-load the piezoelectric vibration exciter to increase the output of the exciter.
- Fig.2 shows a similar arrangement except that instead of a single mass 15, a pair of masses 19 are provided at each end of the piezoelectric vibration exciter 13.
- the piezoelectric vibration exciter 21 is genuinely circular, attached to the panel at the centre of the circle, with a single mass 23 provided on the free peripheral rim 25 of the exciter.
- the mass 23 mass-loads the piezoelectric vibration exciter to increase the output of the exciter.
- Fig. 4 shows an alternative arrangement m which the continuous ring 23 of Fig. 3 is replaced by a plurality of discreet masses 27, symmetrically arranged the rim 25 of the piezoelectric device.
- the invention thus provides a simple way of increasing the output of an exciter.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000614776A JP2002543727A (ja) | 1999-04-29 | 2000-04-28 | 振動励振器 |
DE60005329T DE60005329D1 (de) | 1999-04-29 | 2000-04-28 | Piezoelektrischer schwingungserreger |
AU45824/00A AU4582400A (en) | 1999-04-29 | 2000-04-28 | Vibration exciter |
EP00927419A EP1172019B1 (fr) | 1999-04-29 | 2000-04-28 | Excitateur de vibrations |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9910216.2A GB9910216D0 (en) | 1999-04-29 | 1999-04-29 | Vibration exciter |
GB9910216.2 | 1999-04-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000067525A2 true WO2000067525A2 (fr) | 2000-11-09 |
WO2000067525A3 WO2000067525A3 (fr) | 2001-03-08 |
Family
ID=10852721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/001485 WO2000067525A2 (fr) | 1999-04-29 | 2000-04-28 | Excitateur de vibrations |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1172019B1 (fr) |
JP (1) | JP2002543727A (fr) |
CN (1) | CN1343438A (fr) |
AU (1) | AU4582400A (fr) |
DE (1) | DE60005329D1 (fr) |
GB (1) | GB9910216D0 (fr) |
TW (1) | TW472497B (fr) |
WO (1) | WO2000067525A2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009001769A1 (fr) * | 2007-06-27 | 2008-12-31 | Alps Electric Co., Ltd. | Module d'actionneur par électrostriction |
DE102021213003A1 (de) | 2021-11-18 | 2023-05-25 | Continental Automotive Technologies GmbH | Wandler zum Erzeugen von Schallwellen und Display |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4654554A (en) * | 1984-09-05 | 1987-03-31 | Sawafuji Dynameca Co., Ltd. | Piezoelectric vibrating elements and piezoelectric electroacoustic transducers |
US5309519A (en) * | 1988-10-07 | 1994-05-03 | The Whitaker Corporation | Electroacoustic novelties |
WO1997009842A2 (fr) * | 1995-09-02 | 1997-03-13 | New Transducers Limited | Dispositif acoustique |
EP0871345A1 (fr) * | 1997-04-03 | 1998-10-14 | Sonitron, naamloze Vennootschap | Elément pour la restitution et/ou pour la prise de son |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5819099A (ja) * | 1981-07-27 | 1983-02-03 | Murata Mfg Co Ltd | 圧電型スピ−カ |
-
1999
- 1999-04-29 GB GBGB9910216.2A patent/GB9910216D0/en not_active Ceased
-
2000
- 2000-04-28 JP JP2000614776A patent/JP2002543727A/ja active Pending
- 2000-04-28 CN CN00804709.XA patent/CN1343438A/zh active Pending
- 2000-04-28 AU AU45824/00A patent/AU4582400A/en not_active Abandoned
- 2000-04-28 DE DE60005329T patent/DE60005329D1/de not_active Expired - Lifetime
- 2000-04-28 EP EP00927419A patent/EP1172019B1/fr not_active Expired - Lifetime
- 2000-04-28 WO PCT/GB2000/001485 patent/WO2000067525A2/fr active IP Right Grant
- 2000-05-04 TW TW089108521A patent/TW472497B/zh not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4654554A (en) * | 1984-09-05 | 1987-03-31 | Sawafuji Dynameca Co., Ltd. | Piezoelectric vibrating elements and piezoelectric electroacoustic transducers |
US5309519A (en) * | 1988-10-07 | 1994-05-03 | The Whitaker Corporation | Electroacoustic novelties |
WO1997009842A2 (fr) * | 1995-09-02 | 1997-03-13 | New Transducers Limited | Dispositif acoustique |
EP0871345A1 (fr) * | 1997-04-03 | 1998-10-14 | Sonitron, naamloze Vennootschap | Elément pour la restitution et/ou pour la prise de son |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 007, no. 094 (E-171), 20 April 1983 (1983-04-20) & JP 58 019099 A (MURATA SEISAKUSHO:KK), 3 February 1983 (1983-02-03) * |
Also Published As
Publication number | Publication date |
---|---|
EP1172019B1 (fr) | 2003-09-17 |
CN1343438A (zh) | 2002-04-03 |
JP2002543727A (ja) | 2002-12-17 |
WO2000067525A3 (fr) | 2001-03-08 |
GB9910216D0 (en) | 1999-06-30 |
AU4582400A (en) | 2000-11-17 |
TW472497B (en) | 2002-01-11 |
EP1172019A2 (fr) | 2002-01-16 |
DE60005329D1 (de) | 2003-10-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1250827B1 (fr) | Transducteur | |
EP2587837B1 (fr) | Générateur acoustique | |
US7635941B2 (en) | Transducer | |
JP5012512B2 (ja) | 圧電アクチュエータおよび電子機器 | |
EP1762119B1 (fr) | Transducteur inertiel piezoelectrique | |
US5386169A (en) | Device for causing an untuned structure to vibrate ultrasonically | |
JP5652813B2 (ja) | 電気音響変換器及びそれを用いた電子機器 | |
WO2014103454A1 (fr) | Émetteur sonore et appareil électronique l'utilisant | |
JP2000140759A (ja) | 圧電アクチュエータ及び圧電バイブレータ | |
JPH07213997A (ja) | 圧電振動装置 | |
EP2661102A1 (fr) | Vibreur et appareil électronique | |
US6888946B2 (en) | High frequency loudspeaker | |
US7453772B2 (en) | Flexural cylinder projector | |
JP2001017917A (ja) | 圧電アクチュエータ、圧電バイブレータおよび携帯端末 | |
US6342749B1 (en) | Vibration exciter | |
EP1172019B1 (fr) | Excitateur de vibrations | |
JP2985509B2 (ja) | 低周波水中送波器 | |
KR20060097839A (ko) | 양면으로 진동하는 압전 진동자 및 이를 이용한 압전 평판스피커 | |
JP3418840B2 (ja) | 無音振動型警報器 | |
JP5050652B2 (ja) | 送波器及びその駆動方法 | |
EP1159854A2 (fr) | Excitateurs de vibrations | |
JP2001045588A (ja) | スピーカ | |
JP2000350292A (ja) | 振動発生装置 | |
ZA200205051B (en) | Transducer. | |
GB2433174A (en) | Exciter for a bending wave distributed mode loudspeaker |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 00804709.X 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: 2000927419 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2000 614776 Country of ref document: JP Kind code of ref document: A |
|
WWP | Wipo information: published in national office |
Ref document number: 2000927419 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWG | Wipo information: grant in national office |
Ref document number: 2000927419 Country of ref document: EP |