EP1319321A2 - Loudspeaker driver - Google Patents

Loudspeaker driver

Info

Publication number
EP1319321A2
EP1319321A2 EP01972232A EP01972232A EP1319321A2 EP 1319321 A2 EP1319321 A2 EP 1319321A2 EP 01972232 A EP01972232 A EP 01972232A EP 01972232 A EP01972232 A EP 01972232A EP 1319321 A2 EP1319321 A2 EP 1319321A2
Authority
EP
European Patent Office
Prior art keywords
housing
panel
module according
transducer
audio signal
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
Application number
EP01972232A
Other languages
German (de)
French (fr)
Other versions
EP1319321B1 (en
Inventor
Martin Colloms
Ian David Macfarlane
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
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Publication of EP1319321A2 publication Critical patent/EP1319321A2/en
Application granted granted Critical
Publication of EP1319321B1 publication Critical patent/EP1319321B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/06—Arranging circuit leads; Relieving strain on circuit leads
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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 and more particularly to loudspeaker drivers.
  • the invention particularly relates to the class of loudspeakers known as bending wave speakers, e.g. of the kind described in O97/09842. It is a specific object of the invention to enhance the utility of display signs such as point of purchase or sale advertising display boards. It is a more general object of the invention to provide an inexpensive and even disposable drive unit, which may be self-contained, for objects such as toys, novelties and merchandising, such as point of sale or point of purchase advertising display boards .
  • a module for attachment to a rigid panel and adapted to apply bending wave energy at audio frequencies to the panel whereby the panel can radiate an audio output comprising a housing adapted to be secured to the panel, foot means on the housing and adapted to fix the housing securely to the panel e.g. with the aid of adhesive means, an electromechanical transducer in the housing, means supporting the transducer in the housing the transducer being adapted to contact the panel to apply bending wave energy thereto when energised with an electrical audio signal, and audio signal amplifying means in the housing.
  • the foot means may be providing with pressure sensitive adhesive pads to fix the housing to the panel.
  • the foot means may be continuous or may comprise a plurality of spaced feet.
  • the transducer may be piezoelectric or of the magnet and coil variety.
  • the transducer may be inertial, in which case it is compliantly mounted on the housing, or may be grounded on the housing.
  • the transducer means be adhesively fixed to the panel .
  • the transducer may be compliantly mounted, via its magnet to the housing, and may be adhesively fixed, e.g. via a pressure sensitive panel and via its voice coil to the panel .
  • the mounting of the housing on the panel is compliant.
  • the portion (s) of the housing in the region of the pressure sensitive adhesive means may be resilient. This can be achieved by forming the housing with peripheral inwardly directed resilient flanges to form the foot means .
  • the audio signal amplifying means may be resiliently mounted in the housing.
  • the housing may be perforated to allow audio energy from the panel to pass through the housing.
  • the housing may carry one or more electric dry cell batteries to power the signal amplifying means. These batteries may be substantially symmetrically disposed around the transducer to help equalise force distribution on the transducer suspension.
  • Figure 1 is a cross-sectional side elevation of a first embodiment of module for converting a display board to produce an audio output
  • Figure 2 is a cross-sectional side elevation of a second embodiment of module.
  • FIG. 1 there is shown a module (12) e.g. for converting a rigid panel in the form of a display board
  • (9) e.g. a point of purchase advertising display which are normally made of cardboard or the like rigid lightweight material, to provide an audio output to enhance the display.
  • the module (12) comprises a housing (6) in the form of an dished member e.g. of a rigid plastics formed with foot means in the form of a plurality of spaced peripheral inwardly turned resilient flanges (11) carrying pressure sensitive adhesive pads (5) whereby the housing can be firmly affixed to a face of the display board (9) , with the flanges (11) providing a compliant suspension of the housing (6) on the panel (9) .
  • the housing (6) carries an electro-acoustic transducer (1) of the inertial kind comprising a magnet assembly (15) and a voice coil assembly (16) .
  • the transducer is coupled to the housing (6) by a resilient suspension (2) and the voice coil assembly is rigidly fixed to the board (9) by a pressure sensitive adhesive pad (13) .
  • the transducer can apply bending wave energy to the board (9) to cause it to radiate an acoustic output.
  • the resilient or compliant mounting of the housing on the board is to prevent the housing from hindering the propagation of bending wave energy and to help prevent unwanted or unintended vibration of the housing.
  • the housing may also provide damping or mass loading to improve the performance of the panel .
  • the housing (6) carries signal amplifying electronics
  • the printed circuit board (3) is mounted on a compliant mounting (4) in the housing.
  • the module housing (6) also carries audio signal storage means (19) connected to the audio amplifier electronics
  • the audio signal storage means may, for example, be a tape player or compact disc player or the like.
  • the housing is formed with apertures (10) to allow acoustic energy from the board (9) to pass, substantially unimpeded, through the housing.
  • the printed circuit board is formed with apertures (10) to allow acoustic energy from the board (9) to pass, substantially unimpeded, through the housing.
  • FIG 2 there is shown a module (12) generally of the kind shown in Figure 1 for application to a display board (9) to convert the display board into a loudspeaker.
  • the module housing (6) is mounted to the display board (9) by a self adhesive means (not shown) provided on a peripheral plinth (17) with a corrugated resilient suspension connected between the plinth (17) and the housing (6) .
  • the batteries (8) in the housing are equally disposed about the transducer (1) to assist in equalising force distribution on the transducer suspension.
  • the module incorporates an external sensor (20) fixed to the board (9) at any convenient location, to allow the assembly to respond to proximity or voice input from a passer-by, e.g.
  • the senor being in the form of a PIR or passive infra red movement detector, a photocell, or a sensing microphone.
  • the module may be selectively placed on the display board to apply bending wave energy thereto and for beneficial coupling to the available or desired modal distribution and operable frequency range, e.g. as described in our International application WO97/09842.
  • memory and signal processing for storing, receiving, selecting and decoding audio data may be provided in the module.
  • the amplifier to supply audio power to the exciter may for example be from 0.1 to 10W in output, and is preferably of good efficiency to reduce the need for a bulky heatsink, e.g. it may use digital or switching technology if of higher power, say above 1W.
  • the module may include control circuitry e.g. to adjust level or the data channel.
  • the processor may have a data input to receive audio data/programme .
  • a lamp or LED or form or data display e.g. visual or complementary readout of the audio data may be included to show operational states or to convey additional information, and this may be directed through an aperture in the display board or panel or by the choice of a part or wholly translucent or transparent display panel.
  • the display board or panel used with module may be advantageously be of distributed mode principle/design to further maximise sound quality e.g. as described in WO97/09842.
  • the module may be designed to have adhesive surfaces exposed by peel-off covers for both the module and the exciter coupling to the panel for rapid, non skilled assembly of the complete speaker/sound reproducing system.
  • the module may be designed to be dust/splash proof or waterproof with a continuous adhesive sealing around its perimeter.
  • the invention thus provides a convenient and self contained module for increasing the functionality of display boards and the like, as well as providing a self contained speaker driver for other rigid panels in toys, novelties, and merchandising generally.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

A module for attachment to a rigid panel and adapted to apply bending wave energy at audio frequencies to the panel can radiate an audio output, comprising a housing adapted to be secured to the panel, foot means on the housing and adapted to fix the housing securely to the panel, an electro-mechanical transducer in the housing, means supporting the transducer in the housing the transducer being adapted to contact the panel to apply bending wave energy thereto when energised with an electrical audio signal, and audio signal amplifying means in the housing.

Description

TITLE: LOUDSPEAKER DRIVER
DESCRIPTION
TECHNICAL FIELD The invention relates to loudspeakers and more particularly to loudspeaker drivers.
BACKGROUND ART The invention particularly relates to the class of loudspeakers known as bending wave speakers, e.g. of the kind described in O97/09842. It is a specific object of the invention to enhance the utility of display signs such as point of purchase or sale advertising display boards. It is a more general object of the invention to provide an inexpensive and even disposable drive unit, which may be self-contained, for objects such as toys, novelties and merchandising, such as point of sale or point of purchase advertising display boards . DISCLOSURE OF INVENTION According to the invention there is provided a module for attachment to a rigid panel and adapted to apply bending wave energy at audio frequencies to the panel whereby the panel can radiate an audio output, comprising a housing adapted to be secured to the panel, foot means on the housing and adapted to fix the housing securely to the panel e.g. with the aid of adhesive means, an electromechanical transducer in the housing, means supporting the transducer in the housing the transducer being adapted to contact the panel to apply bending wave energy thereto when energised with an electrical audio signal, and audio signal amplifying means in the housing.
The foot means may be providing with pressure sensitive adhesive pads to fix the housing to the panel. The foot means may be continuous or may comprise a plurality of spaced feet.
The transducer may be piezoelectric or of the magnet and coil variety. The transducer may be inertial, in which case it is compliantly mounted on the housing, or may be grounded on the housing. The transducer means be adhesively fixed to the panel . Thus where the transducer is an electrodynamic device, it may be compliantly mounted, via its magnet to the housing, and may be adhesively fixed, e.g. via a pressure sensitive panel and via its voice coil to the panel .
Preferably the mounting of the housing on the panel is compliant. Thus the portion (s) of the housing in the region of the pressure sensitive adhesive means may be resilient. This can be achieved by forming the housing with peripheral inwardly directed resilient flanges to form the foot means . The audio signal amplifying means may be resiliently mounted in the housing.
The housing may be perforated to allow audio energy from the panel to pass through the housing.
The housing may carry one or more electric dry cell batteries to power the signal amplifying means. These batteries may be substantially symmetrically disposed around the transducer to help equalise force distribution on the transducer suspension.
BRIEF DESCRIPTION OF DRAWINGS
The invention is diagrammatically illustrated, by way of example, in the accompanying drawings, in which: -
Figure 1 is a cross-sectional side elevation of a first embodiment of module for converting a display board to produce an audio output, and
Figure 2 is a cross-sectional side elevation of a second embodiment of module.
BEST MODES FOR CARRYING OUT THE INVENTION In Figure 1 there is shown a module (12) e.g. for converting a rigid panel in the form of a display board
(9) , e.g. a point of purchase advertising display which are normally made of cardboard or the like rigid lightweight material, to provide an audio output to enhance the display.
The module (12) comprises a housing (6) in the form of an dished member e.g. of a rigid plastics formed with foot means in the form of a plurality of spaced peripheral inwardly turned resilient flanges (11) carrying pressure sensitive adhesive pads (5) whereby the housing can be firmly affixed to a face of the display board (9) , with the flanges (11) providing a compliant suspension of the housing (6) on the panel (9) .
The housing (6) carries an electro-acoustic transducer (1) of the inertial kind comprising a magnet assembly (15) and a voice coil assembly (16) . The transducer is coupled to the housing (6) by a resilient suspension (2) and the voice coil assembly is rigidly fixed to the board (9) by a pressure sensitive adhesive pad (13) . In this way the transducer can apply bending wave energy to the board (9) to cause it to radiate an acoustic output. The resilient or compliant mounting of the housing on the board is to prevent the housing from hindering the propagation of bending wave energy and to help prevent unwanted or unintended vibration of the housing. Thus the housing may also provide damping or mass loading to improve the performance of the panel . The housing (6) carries signal amplifying electronics
(18), e.g. a PWA or pulse width amplifier, mounted on a printed circuit board (3) and electric batteries (8) for powering the power amplifier. The printed circuit board (3) is mounted on a compliant mounting (4) in the housing.
The module housing (6) also carries audio signal storage means (19) connected to the audio amplifier electronics
(18) . The audio signal storage means may, for example, be a tape player or compact disc player or the like.
The housing is formed with apertures (10) to allow acoustic energy from the board (9) to pass, substantially unimpeded, through the housing. The printed circuit board
(3) on which the electronics (18) is mounted may similarly be apertured for the same purpose. Power supply connectors (7) to the amplifier (13) , can be provided as an alternative to the use of internal batteries.
In Figure 2 there is shown a module (12) generally of the kind shown in Figure 1 for application to a display board (9) to convert the display board into a loudspeaker. In this embodiment the module housing (6) is mounted to the display board (9) by a self adhesive means (not shown) provided on a peripheral plinth (17) with a corrugated resilient suspension connected between the plinth (17) and the housing (6) . The batteries (8) in the housing are equally disposed about the transducer (1) to assist in equalising force distribution on the transducer suspension. The module incorporates an external sensor (20) fixed to the board (9) at any convenient location, to allow the assembly to respond to proximity or voice input from a passer-by, e.g. the sensor being in the form of a PIR or passive infra red movement detector, a photocell, or a sensing microphone. The module may be selectively placed on the display board to apply bending wave energy thereto and for beneficial coupling to the available or desired modal distribution and operable frequency range, e.g. as described in our International application WO97/09842.
In board electronics, memory and signal processing for storing, receiving, selecting and decoding audio data may be provided in the module.
The amplifier to supply audio power to the exciter may for example be from 0.1 to 10W in output, and is preferably of good efficiency to reduce the need for a bulky heatsink, e.g. it may use digital or switching technology if of higher power, say above 1W.
The module may include control circuitry e.g. to adjust level or the data channel.
The processor may have a data input to receive audio data/programme .
A lamp or LED or form or data display, e.g. visual or complementary readout of the audio data may be included to show operational states or to convey additional information, and this may be directed through an aperture in the display board or panel or by the choice of a part or wholly translucent or transparent display panel.
The display board or panel used with module may be advantageously be of distributed mode principle/design to further maximise sound quality e.g. as described in WO97/09842.
The module may be designed to have adhesive surfaces exposed by peel-off covers for both the module and the exciter coupling to the panel for rapid, non skilled assembly of the complete speaker/sound reproducing system. The module may be designed to be dust/splash proof or waterproof with a continuous adhesive sealing around its perimeter.
INDUSTRIAL APPLICABILITY
The invention thus provides a convenient and self contained module for increasing the functionality of display boards and the like, as well as providing a self contained speaker driver for other rigid panels in toys, novelties, and merchandising generally.

Claims

1. A module for attachment to a rigid panel and adapted to apply bending wave energy at audio frequencies to the panel whereby the panel can radiate an audio output, comprising a housing adapted to be secured to the panel, foot means on the housing and adapted to fix the housing securely to the panel , an electro-mechanical transducer in the housing, means supporting the transducer in the housing the transducer being adapted to contact the panel to apply bending wave energy thereto when energised with an electrical audio signal, and audio signal amplifying means in the housing.
2. A module according to claim 1, wherein the foot means is providing with pressure sensitive adhesive pads to fix the housing to the panel.
3. A module according to claim 1 or claim 2 , wherein the foot means comprises a plurality of spaced feet .
4. A module according to any one of claims 1 to 3 , wherein the transducer is of the magnet and coil variety.
5. A module according to claim 4, wherein the transducer is inertial, and is compliantly mounted on the housing.
6. A module according to any preceding claim, wherein the transducer means is adhesively fixed to the panel .
7. A module according to any preceding claim, wherein the mounting of the housing on the panel is compliant.
8. A module according to claim 7, when dependent on claim 2, wherein the portion (s) of the housing in the region of the pressure sensitive adhesive means are resilient.
9. A module according to claim 8, wherein the housing is formed with peripheral inwardly directed resilient flanges to form the foot means .
10. A module according to any preceding claim, wherein the 5 audio signal amplifying means is resiliently mounted in the housing.
11. A module according to any preceding claim, wherein the housing is perforated to allow audio energy from the panel to pass through the housing.
10 12. A module according to any preceding claim, wherein the housing carries at least one electric dry cell battery to power the signal amplifying means.
13. A module according to claim 12, comprising a plurality of batteries which are substantially symmetrically disposed
15 around the transducer to help equalise force distribution on the transducer suspension.
14. A module according to any preceding claim, comprising audio signal storage means connected to the audio signal amplifying means.
20 15. A module according to any preceding claim, comprising motion or proximity sensing means adapted to activate the audio signal amplifying means.
16. A bending wave loudspeaker comprising a rigid panel and a module as claimed in any proceeding claim attached to
25 the panel to apply bending wave energy thereto.
17. A signboard comprising a bending wave loudspeaker according to claim 16.
EP01972232A 2000-09-21 2001-09-05 Loudspeaker driver Expired - Lifetime EP1319321B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB0023134.0A GB0023134D0 (en) 2000-09-21 2000-09-21 Loudspeaker driver
GB0023134 2000-09-21
PCT/GB2001/003995 WO2002025992A2 (en) 2000-09-21 2001-09-05 Loudspeaker driver

Publications (2)

Publication Number Publication Date
EP1319321A2 true EP1319321A2 (en) 2003-06-18
EP1319321B1 EP1319321B1 (en) 2011-12-07

Family

ID=9899847

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01972232A Expired - Lifetime EP1319321B1 (en) 2000-09-21 2001-09-05 Loudspeaker driver

Country Status (8)

Country Link
EP (1) EP1319321B1 (en)
JP (1) JP2004509542A (en)
CN (1) CN1462566A (en)
AU (1) AU2001292012A1 (en)
ES (1) ES2378815T3 (en)
GB (1) GB0023134D0 (en)
HK (1) HK1052430A1 (en)
WO (1) WO2002025992A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2376829A (en) * 2001-04-21 2002-12-24 Michael Andrew Beadman Removable audio exciter system
JP6828259B2 (en) * 2016-03-28 2021-02-10 ソニー株式会社 Electronics and lighting systems

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926486A (en) * 1987-07-17 1990-05-15 Barsumian Bruce R Transducer assembly for automatic message system
UA51671C2 (en) * 1995-09-02 2002-12-16 Нью Транзд'Юсез Лімітед Acoustic device
GB9822246D0 (en) * 1998-10-13 1998-12-09 New Transducers Ltd Loudspeakers
GB9701983D0 (en) * 1997-01-31 1997-03-19 New Transducers Ltd Electro-dynamic exciter
GB9903044D0 (en) * 1999-02-11 1999-03-31 New Transducers Ltd Loudspeakers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0225992A2 *

Also Published As

Publication number Publication date
HK1052430A1 (en) 2003-09-11
GB0023134D0 (en) 2000-11-01
WO2002025992A2 (en) 2002-03-28
JP2004509542A (en) 2004-03-25
EP1319321B1 (en) 2011-12-07
ES2378815T3 (en) 2012-04-18
WO2002025992A3 (en) 2003-01-03
AU2001292012A1 (en) 2002-04-02
CN1462566A (en) 2003-12-17

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