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WO2000067525A2 - Excitateur de vibrations - Google Patents

Excitateur de vibrations Download PDF

Info

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
Application number
PCT/GB2000/001485
Other languages
English (en)
Other versions
WO2000067525A3 (fr
Inventor
Henry Azima
Original Assignee
New Transducers Limited
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
Application filed by New Transducers Limited filed Critical New Transducers Limited
Priority to EP00927419A priority Critical patent/EP1172019B1/fr
Priority to DE60005329T priority patent/DE60005329D1/de
Priority to AU45824/00A priority patent/AU4582400A/en
Priority to JP2000614776A priority patent/JP2002543727A/ja
Publication of WO2000067525A2 publication Critical patent/WO2000067525A2/fr
Publication of WO2000067525A3 publication Critical patent/WO2000067525A3/fr

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
    • 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

La présente invention concerne un dispositif piézo-électrique courbe (3), fixé à une plaque (11), et destiné à faire vibrer cette plaque. Une masselotte est appliquée à au moins une extrémité libre (14) du dispositif piézo-électrique afin d'en augmenter la puissance de sortie.
PCT/GB2000/001485 1999-04-29 2000-04-28 Excitateur de vibrations WO2000067525A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP00927419A EP1172019B1 (fr) 1999-04-29 2000-04-28 Excitateur de vibrations
DE60005329T DE60005329D1 (de) 1999-04-29 2000-04-28 Piezoelektrischer schwingungserreger
AU45824/00A AU4582400A (en) 1999-04-29 2000-04-28 Vibration exciter
JP2000614776A JP2002543727A (ja) 1999-04-29 2000-04-28 振動励振器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9910216.2 1999-04-29
GBGB9910216.2A GB9910216D0 (en) 1999-04-29 1999-04-29 Vibration exciter

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)

* Cited by examiner, † Cited by third party
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
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
GB2166022A (en) * 1984-09-05 1986-04-23 Sawafuji Dynameca Co Ltd Piezoelectric vibrator
US5115472A (en) * 1988-10-07 1992-05-19 Park Kyung T Electroacoustic novelties
UA51671C2 (uk) * 1995-09-02 2002-12-16 Нью Транзд'Юсез Лімітед Акустичний пристрій
BE1011085A4 (nl) * 1997-04-03 1999-04-06 Sonitron Naamloze Vennootschap Element voor het weergeven en/of opnemen van geluid.

Also Published As

Publication number Publication date
AU4582400A (en) 2000-11-17
GB9910216D0 (en) 1999-06-30
WO2000067525A3 (fr) 2001-03-08
JP2002543727A (ja) 2002-12-17
TW472497B (en) 2002-01-11
DE60005329D1 (de) 2003-10-23
EP1172019B1 (fr) 2003-09-17
EP1172019A2 (fr) 2002-01-16
CN1343438A (zh) 2002-04-03

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