GB2367706A - Bending wave loudspeaker with wall mounting arrangement - Google Patents

Bending wave loudspeaker with wall mounting arrangement Download PDF

Info

Publication number
GB2367706A
GB2367706A GB0113481A GB0113481A GB2367706A GB 2367706 A GB2367706 A GB 2367706A GB 0113481 A GB0113481 A GB 0113481A GB 0113481 A GB0113481 A GB 0113481A GB 2367706 A GB2367706 A GB 2367706A
Authority
GB
United Kingdom
Prior art keywords
panel
wall
acoustic
acoustic absorber
face
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.)
Withdrawn
Application number
GB0113481A
Other versions
GB0113481D0 (en
Inventor
Martin Colloms
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 GB0113481D0 publication Critical patent/GB0113481D0/en
Publication of GB2367706A publication Critical patent/GB2367706A/en
Withdrawn legal-status Critical Current

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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • 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
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/021—Transducers or their casings adapted for mounting in or to a wall or ceiling

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

A panel-form loudspeaker adapted to be mounted direct to a wall (28), the loudspeaker comprising a panel (10) which is capable of supporting bending wave vibration, the panel (10) having a front face (26) from which acoustic radiation is to be projected and a rear face (24) to be positioned adjacent to the wall (28), a vibration transducer (16) mounted on the panel (10) for driving bending-wave vibration into the panel to produce an acoustic output, and a wall mounting arrangement for supporting the loudspeaker on the wall. The arrangement comprises a compliant panel suspension (22) on the rear panel face and an acoustic absorber (12) attached to the panel suspension (22). The acoustic absorber (12) is attached to a wall (28) by wall fixings (14).

Description

TITLE : LOUDSPEAKERS
DESCRIPTION The invention relates to loudspeakers and more particularly to bending-wave panel loudspeakers, e. g. of the kind described in W097/09842.
It is an object of the invention to facilitate the wall-mounting, or the equivalent surface mounting of bending-wave panel loudspeakers. A problem with wall mounting such a loudspeaker is that reflected acoustic radiation from the face of the panel facing the wall, i. e. the rear face, can interfere destructively with the panel's front face output. One solution to this problem is to enclose the rear panel face in an enclosure or baffle.
The present invention aims to provide an alternative solution where the cost and appearance of such a rear enclosure is avoided.
According to the invention there is provided a panelform loudspeaker adapted to be mounted directly to a wall or the like, the loudspeaker comprising a panel which is capable of supporting bending wave vibration, the panel having a front face from which acoustic radiation is to be projected and a rear face to be positioned adjacent to the wall, a vibration transducer mounted on the panel for driving bending-wave vibration into the panel to produce an acoustic output, and a wall mounting arrangement for supporting the loudspeaker on the wall, the arrangement comprising a compliant panel suspension on the rear panel face and an acoustic absorber attached to the panel suspension and adapted for attachment to the wall, the acoustic absorber extending over a major part of the rear panel face.
The vibration transducer or exciter may be on the rear face of the panel. Alternatively, the vibration transducer may be positioned in a cavity in the acoustic absorber.
The compliant panel suspension may be co-extensive with the acoustic absorber and may comprise a layer of resilient foam material. Alternatively, the material of the acoustic absorber may also form the panel suspension.
The acoustic absorber may extend near to the panel edges. The acoustic absorber may be of acoustic foam and may be in the form of a block.
Wall fixings may be provided on a rear face of the acoustic absorber. These may, for example, be detachable
ffixings e. g. of Velcro or the like.
'A The panel may be as taught in W097/09842 and hence may be capable of supporting resonant bending wave modes and the transducer may be mounted to the panel to excite resonant bending wave modes to produce an acoustic output The panel may thus be frame-less.
The invention is diagrammatically illustrated, by way of example, in the accompanying drawings, in which: Figure 1 is a rear view of a loudspeaker according to the invention and Figure 2 is a cross-sectional side view of the loudspeaker of Figure 1.
Figures 1 and 2 show a loudspeaker which is designed to be mounted direct to a wall or the like. The loudspeaker comprises an acoustic member in the form of a panel (10) which is capable of supporting bending wave vibration, in particular resonant bending wave modes. Two vibration transducers (14) are mounted to a rear face (24) of the panel (10) and are connected to an electric input via wires (18). The transducers (14) excite bending wave vibration in the panel to produce an acoustic output which is projected from the front face (26) of the panel. The panel and transducer locations may be chosen as taught in W097/09842 so that the loudspeaker may be considered a distributed mode loudspeaker.
The loudspeaker further comprises an acoustic absorber (12) positioned adjacent to the rear face (24) of the panel and a compliant panel suspension (22) sandwiched
between the rear panel face (24) and the acoustic absorber (12). The compliant panel suspension comprises a layer of resilient foam material and the acoustic absorber is of acoustic foam. Thus, in combination, the panel suspension and acoustic absorber provide maximal acoustic absorption so that acoustic output from the rear face of the panel is greatly reduced. In this way the problem of destructive interference between the radiation from the rear face and the front face is alleviated or prevented.
The compliant panel suspension (22) is co-extensive with the acoustic absorber (12). The compliant panel suspension (22) extends over a major part of the rear panel face (24) but does not extend to the edges of the panel. Each vibration transducer (16) is positioned in a cavity in the acoustic absorber. The panel suspension (22) and acoustic absorber (12) form part of the mounting arrangement for the loudspeaker. The mounting arrangement also comprises four wall fixing units (14) which are attached to a rear face of the acoustic absorber (12) and are designed to attach to the wall (28). In this way, the loudspeaker is mounted to the wall (28) using a mounting arrangement which is concealed behind the panel and without the need for a frame surrounding the edges (20) of the panel.
The invention thus provides an alternative to a rear enclosure or baffle for a wall mounted bending-wave panel loudspeaker.

Claims (10)

  1. CLAIMS 1. A panel-form loudspeaker adapted to be mounted directly to a wall, the loudspeaker comprising a panel which is capable of supporting bending wave vibration, the panel having a front face from which acoustic radiation is to be projected and a rear face to be positioned adjacent to the wall, a vibration transducer mounted on the panel for driving bending-wave vibration into the panel to produce an acoustic output, and a wall mounting arrangement for supporting the loudspeaker on the wall, the arrangement comprising a compliant panel suspension on the rear panel face and an acoustic absorber attached to the panel suspension and adapted for attachment to the wall, the acoustic absorber extending over a major part of the rear panel face.
  2. 2. A panel-form loudspeaker according to claim 1, wherein the vibration transducer is mounted on the rear face of the panel.
  3. 3. A panel-form loudspeaker according to claim 1 or claim 2, wherein the vibration transducer is positioned in a cavity in the acoustic absorber.
  4. 4. A panel-form loudspeaker according to any preceding claim, wherein the compliant panel suspension is coextensive with the acoustic absorber.
  5. S. A panel-form loudspeaker according to any preceding claim, wherein the compliant panel suspension comprises a layer of resilient foam material.
  6. 6. A panel-form loudspeaker according to any one of
    claims 1 to 3, wherein the material of the acoustic absorber also forms the panel suspension.
  7. 7. A panel-form loudspeaker according to any preceding claim, wherein the acoustic absorber extends near to the panel edges.
  8. 8. A panel-form loudspeaker according to any preceding claim, wherein the acoustic absorber is of acoustic foam.
  9. 9. A panel-form loudspeaker according to any preceding claim, wherein wall fixings are provided on a rear face of the acoustic absorber.
  10. 10. A panel-form loudspeaker according to any preceding claim, wherein the panel is capable of supporting resonant bending wave modes and the transducer is mounted to the panel to excite resonant bending wave modes to produce an acoustic output.
GB0113481A 2000-06-02 2001-06-01 Bending wave loudspeaker with wall mounting arrangement Withdrawn GB2367706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0013317A GB0013317D0 (en) 2000-06-02 2000-06-02 Loudspeakers

Publications (2)

Publication Number Publication Date
GB0113481D0 GB0113481D0 (en) 2001-07-25
GB2367706A true GB2367706A (en) 2002-04-10

Family

ID=9892784

Family Applications (2)

Application Number Title Priority Date Filing Date
GB0013317A Ceased GB0013317D0 (en) 2000-06-02 2000-06-02 Loudspeakers
GB0113481A Withdrawn GB2367706A (en) 2000-06-02 2001-06-01 Bending wave loudspeaker with wall mounting arrangement

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB0013317A Ceased GB0013317D0 (en) 2000-06-02 2000-06-02 Loudspeakers

Country Status (1)

Country Link
GB (2) GB0013317D0 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108260038B (en) * 2018-03-23 2024-02-13 苏州登堡电子科技有限公司 Spring type wall vibration sound transmission device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000033613A2 (en) * 1998-12-02 2000-06-08 New Transducers Limited Resonant bending wave panel-form loudspeaker
WO2000070908A2 (en) * 1999-05-14 2000-11-23 New Transducers Limited Bending wave loudspeakers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000033613A2 (en) * 1998-12-02 2000-06-08 New Transducers Limited Resonant bending wave panel-form loudspeaker
WO2000070908A2 (en) * 1999-05-14 2000-11-23 New Transducers Limited Bending wave loudspeakers

Also Published As

Publication number Publication date
GB0113481D0 (en) 2001-07-25
GB0013317D0 (en) 2000-07-26

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)